JP7699945B2 - Medical image diagnostic device, medical image diagnostic method, and program - Google Patents

Description

The embodiments disclosed in this specification and the drawings relate to a medical image diagnostic device, a medical image diagnostic method, and a program.

In diagnoses using medical imaging diagnostic equipment such as X-ray CT (Computed Tomography) equipment, the weight of the subject may be measured in order to determine the amount of contrast agent to be administered to the subject depending on the subject's weight (body weight). The weight of the subject may be measured using a weight sensor such as a load cell attached to the bed of the medical imaging diagnostic equipment.

When performing image diagnosis on a subject, in addition to the subject P, accessories such as a pump may be placed on the bed. If the weight of the subject is measured with such accessories still placed on the bed, the weight may not be measured accurately. If the weight of the subject cannot be measured accurately, it becomes difficult to appropriately set the amount of contrast agent.

JP 2014-213085 A JP 2010-17457 A JP 2006-95278 A

The problem that the embodiments disclosed in this specification and the drawings aim to solve is to be able to accurately measure the weight of a subject placed on a bed. However, the problem that the embodiments disclosed in this specification and the drawings aim to solve is not limited to the above problem. Problems corresponding to the effects of each configuration shown in the embodiments described below can also be positioned as other problems.

The medical image diagnostic device of the embodiment has a first acquisition unit, a recognition unit, a second acquisition unit, and a calculation unit. The first acquisition unit acquires the load applied to a bed on which a subject to be imaged is placed. The recognition unit recognizes an object placed on the bed. The second acquisition unit acquires the weight of the object. The calculation unit calculates the weight of the subject on the bed based on the load and the weight of the object.

1 is a configuration diagram of an X-ray CT apparatus 1 according to a first embodiment. FIG. 4 is a diagram showing an example of the contents of a weight correspondence table. FIG. 4 is a diagram showing an example of an image displayed on a display 42 before image diagnosis is started. 4 is a flowchart showing an example of processing before image diagnosis is performed by the X-ray CT apparatus 1. FIG. 4 is a diagram showing an example of a state in which the top plate 33 is imaged by a camera. 11 is a flowchart showing an example of a procedure for calculating the weight of a subject P. FIG. 13 is a diagram showing an example of a processing circuit 50 in the X-ray CT apparatus 1 of the second embodiment. FIG. 11 is a diagram showing an example of the contents of a weight correspondence table according to the second embodiment. FIG. 4 is a diagram showing an example of a warning image displayed on a display 42. FIG. 13 is a diagram showing an example of a variable accessory weight correspondence table. 10 is a flowchart showing an example of a procedure for calculating the weight of a subject P according to the second embodiment. FIG. 4 is a diagram showing an example of a confirmation image displayed on a display 42. FIG. 13 is a diagram showing an example of an image displayed on the display 42 after an input operation of a correction button GA5 is performed. 13 is a flowchart showing an example of processing before image diagnosis is performed by the X-ray CT apparatus 1 of the third embodiment. 10 is a flowchart showing an example of a procedure for calculating the weight of a subject P in the X-ray CT apparatus 1 of the third embodiment. FIG. 13 is a diagram showing an example of a warning image including declaration information displayed on a display 42.

The following describes the medical image diagnostic device, medical image diagnostic method, and program of the embodiment with reference to the drawings.

(First embodiment)
FIG. 1 is a configuration diagram of an X-ray CT apparatus 1 according to a first embodiment. The X-ray CT apparatus 1 includes, for example, a gantry 10, a camera unit 20, a bed apparatus 30, and a console apparatus 40. In FIG. 1, for convenience of explanation, both a view of the gantry 10 from the Z-axis direction and a view of the gantry 10 from the X-axis direction are shown, but in reality, there is only one gantry 10. In the embodiment, the rotation axis of the rotating frame 17 in a non-tilted state or the longitudinal direction of the top plate 33 of the bed apparatus 30 is defined as the Z-axis direction, an axis perpendicular to the Z-axis direction and horizontal to the floor surface is defined as the X-axis direction, and a direction perpendicular to the Z-axis direction and perpendicular to the floor surface is defined as the Y-axis direction. The X-ray CT apparatus 1 is an example of a medical image diagnostic apparatus.

The gantry device 10 includes, for example, an X-ray tube 11, a wedge 12, a collimator 13, an X-ray high voltage device 14, an X-ray detector 15, a data acquisition system (hereinafter, DAS: Data Acquisition System) 16, a rotating frame 17, and a control device 18.

The X-ray tube 11 generates X-rays by irradiating thermoelectrons from a cathode (filament) to an anode (target) when a high voltage is applied from the X-ray high voltage device 14. The X-ray tube 11 includes a vacuum tube. For example, the X-ray tube 11 is a rotating anode type X-ray tube that generates X-rays by irradiating thermoelectrons to a rotating anode.

The wedge 12 is a filter for adjusting the amount of X-rays irradiated from the X-ray tube 11 to the subject P. The wedge 12 attenuates the X-rays that pass through it so that the distribution of the amount of X-rays irradiated from the X-ray tube 11 to the subject P becomes a predetermined distribution. The wedge 12 is also called a wedge filter or a bow-tie filter. The wedge 12 is made by processing aluminum so that it has a predetermined target angle and a predetermined thickness, for example.

The collimator 13 is a mechanism for narrowing the irradiation range of the X-rays that have passed through the wedge 12. The collimator 13 narrows the irradiation range of the X-rays, for example, by forming a slit by combining multiple lead plates. The collimator 13 is sometimes called an X-ray aperture. The narrowing range of the collimator 13 may be mechanically operable.

The X-ray high voltage device 14 has, for example, a high voltage generator and an X-ray control device. The high voltage generator has an electric circuit including a transformer and a rectifier, and generates a high voltage to be applied to the X-ray tube 11. The X-ray control device controls the output voltage of the high voltage generator according to the amount of X-rays to be generated by the X-ray tube 11. The high voltage generator may be one that boosts the voltage using the above-mentioned transformer, or one that boosts the voltage using an inverter. The X-ray high voltage device 14 may be provided on the rotating frame 17, or on the side of the fixed frame (not shown) of the gantry device 10.

The X-ray detector 15 detects the intensity of the X-rays generated by the X-ray tube 11 and passing through the subject P. The X-ray detector 15 outputs an electrical signal (which may be an optical signal, etc.) corresponding to the intensity of the detected X-rays to the DAS 16. The X-ray detector 15 has, for example, multiple rows of X-ray detection elements. Each of the multiple rows of X-ray detection elements has multiple X-ray detection elements arranged in the channel direction along an arc centered on the focal point of the X-ray tube 11. The multiple rows of X-ray detection elements are arranged in the slice direction (row direction).

The X-ray detector 15 is an indirect detector having, for example, a grid, a scintillator array, and an optical sensor array. The scintillator array has a plurality of scintillators. Each scintillator has a scintillator crystal. The scintillator crystal emits an amount of light according to the intensity of the incident X-rays. The grid is arranged on the surface of the scintillator array on which the X-rays are incident, and has an X-ray shielding plate that has the function of absorbing scattered X-rays. The grid is sometimes called a collimator (one-dimensional collimator or two-dimensional collimator). The optical sensor array has, for example, an optical sensor such as a photomultiplier tube (PMT). The optical sensor array outputs an electrical signal according to the amount of light emitted by the scintillator. The X-ray detector 15 may be a direct conversion type detector having a semiconductor element that converts the incident X-rays into an electrical signal.

DAS16 includes, for example, an amplifier, an integrator, and an A/D converter. The amplifier performs an amplification process on the electrical signal output by each X-ray detection element of the X-ray detector 15. The integrator integrates the amplified electrical signal over a view period. The A/D converter converts the electrical signal indicating the integration result into a digital signal. DAS16 outputs detection data based on the digital signal to the console device 40.

The rotating frame 17 supports the X-ray tube 11, wedge 12, and collimator 13 in opposing relation to the X-ray detector 15. The rotating frame 17 is an annular member having two circular side surfaces with a circular opening in the center, an inner side surface connecting the inner circles on both sides, and an outer side surface connecting the outer circles on both sides. Both sides of the rotating frame 17 are flat, and the inner and outer sides are curved.

The rotating frame 17 is an annular member that supports the X-ray tube 11, wedge 12, collimator 13, and X-ray detector 15 in opposing relation. The rotating frame 17 is supported by a fixed frame (not shown) so as to be freely rotatable around the subject P introduced inside. The rotating frame 17 also supports the DAS 16. The detection data output by the DAS 16 is transmitted by optical communication from a transmitter having a light-emitting diode (LED) provided on the rotating frame 17 to a receiver having a photodiode provided on a non-rotating part (e.g., the fixed frame) of the gantry device 10, and is transferred to the console device 40 by the receiver. Note that the method of transmitting the detection data from the rotating frame 17 to the non-rotating part is not limited to the above-mentioned method using optical communication, and any non-contact transmission method may be adopted. The rotating frame 17 is not limited to an annular member, and may be an arm-like member as long as it can support and rotate the X-ray tube 11, etc.

The X-ray CT device 1 is, for example, a Rotate/Rotate-type X-ray CT device (third generation CT) in which both the X-ray tube 11 and the X-ray detector 15 are supported by a rotating frame 17 and rotate around the subject P, but is not limited to this and may also be a Stationary/Rotate-type X-ray CT device (fourth generation CT) in which multiple X-ray detection elements arranged in a circular ring are fixed to a fixed frame and the X-ray tube 11 rotates around the subject P.

The control device 18 has, for example, a processing circuit having a processor such as a CPU (Central Processing Unit) and a drive mechanism including a motor, actuator, etc. The processing circuit realizes these functions by, for example, a hardware processor executing a program stored in a storage device (storage circuit).

The hardware processor refers to a circuit such as a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an Application Specific Integrated Circuit (ASIC), a programmable logic device (e.g., a Simple Programmable Logic Device (SPLD) or a Complex Programmable Logic Device (CPLD), or a Field Programmable Gate Array (FPGA). Instead of storing a program in a storage device, the program may be directly built into the circuit of the hardware processor. In this case, the hardware processor realizes a function by reading and executing the program built into the circuit. The hardware processor is not limited to being configured as a single circuit, but may be configured as a single hardware processor by combining multiple independent circuits to realize each function. The storage device may be a non-transitory (hardware) storage medium. Also, multiple components may be integrated into a single hardware processor to realize each function.

The control device 18, for example, rotates the rotating frame 17, tilts the gantry of the gantry device 10, moves the top plate 33 of the bed device 30 by vertical movement, and radiates (exposes) X-rays from the X-ray tube 11. The control device 18 may be provided in the gantry device 10 or in the console device 40.

The camera unit 20 includes, for example, a first camera 21 and a second camera 22. Both the first camera 21 and the second camera 22 are provided above the top board 33 of the bed device 30. The camera unit 20 may include one camera or multiple cameras. The mounting position of the camera unit 20 may be a position other than that of the first embodiment.

The first camera 21 and the second camera 22 are both provided on the upper and right side of the gantry device 10 on the side where the bed is provided, facing the direction of the bed device 30. The camera unit 20 captures an image of an accessory mounted on the top board 33, for example. The camera unit 20 transmits an electrical signal of an image including the captured accessory to the console device 40. The top board 33 is an example of a bed.

The bed device 30 is a device that places and moves the subject P to be scanned and introduces it into the rotating frame 17 of the gantry device 10. The bed device 30 includes, for example, a base 31, a bed driving device 32, a top plate 33, a support frame 34, and a load sensor 35. The base 31 includes a housing that supports the support frame 34 so that it can move in the vertical direction (Y-axis direction). The bed driving device 32 includes a motor and an actuator. The bed driving device 32 moves the top plate 33, on which the subject P is placed, along the support frame 34 in the longitudinal direction of the top plate 33 (Z-axis direction).

The bed driving device 32 may move not only the top plate 33 but also the support frame 34 in the longitudinal direction of the top plate 33. Alternatively, the gantry device 10 may be movable in the Z-axis direction, and the rotation frame 17 may be controlled to come around the subject P by the movement of the gantry device 10. Alternatively, both the gantry device 10 and the top plate 33 may be configured to be movable.

The load sensor 35 includes, for example, a first load sensor 35A and a second load sensor 35B. The first load sensor 35A and the second load sensor 35B each include, for example, a load converter called a load cell that electrically converts load. The first load sensor 35A is placed on the support frame 34 on one longitudinal side of the top plate 33 to support the top plate 33. The second load sensor 35B is placed on the support frame 34 on the other longitudinal side of the top plate 33 to support the top plate 33. The load sensor 35 is electrically connected to the console device 40.

The load converter is a device that converts load into an electrical signal by amplifying the electrical signal from a sensor (load cell), whose resistance value changes greatly due to subtle distortion of metal caused by force or weight. Examples of this load converter include strain gauge type load converters, compression type (button or diaphragm) load cells, tension/compression type (dual-use) load cells, beam type load cells, and cantilever beam type load cells. The load sensor 35 converts the loads detected by the first load sensor 35A and the second load sensor 35B and transmits the converted electrical signals to the console device 40.

The console device 40 has, for example, a memory 41, a display 42, an input interface 43, and a processing circuit 50. In the embodiment, the console device 40 is described as being separate from the gantry device 10, but the gantry device 10 may include some or all of the components of the console device 40.

The memory 41 is realized by, for example, a semiconductor memory element such as a RAM (Random Access Memory), a flash memory, a hard disk, an optical disk, etc. The memory 41 stores, for example, detection data, projection data, reconstructed image data, CT image data, etc. These data may be stored in an external memory with which the X-ray CT device 1 can communicate, instead of the memory 41 (or in addition to the memory 41). The external memory is controlled by, for example, a cloud server that manages the external memory, by the cloud server accepting a read/write request.

The display 42 displays various types of information. For example, the display 42 displays medical images (CT images) generated by the processing circuit, GUI (Graphical User Interface) images that accept various operations by operators such as doctors and engineers, and the like. The display 42 is, for example, a liquid crystal display, a CRT (Cathode Ray Tube), an organic EL (Electroluminescence) display, or the like. The display 42 may be provided on the pedestal device 10. The display 42 may be a desktop type, or may be a display device (e.g., a tablet terminal) that can wirelessly communicate with the main body of the console device 40.

The input interface 43 accepts various input operations by the operator and outputs an electrical signal indicating the content of the accepted input operation to the processing circuit 50. For example, the input interface 43 accepts input operations such as collection conditions when collecting detection data or projection data, reconstruction conditions when reconstructing a CT image, and image processing conditions when generating a post-processed image from a CT image. The input interface 43 is realized by, for example, a mouse, keyboard, touch panel, drag ball, switch, button, joystick, camera, infrared sensor, microphone, etc. The input interface 43 may also be realized by a display device (e.g., a tablet terminal) capable of wireless communication with the main body of the console device 40.

In this specification, the input interface is not limited to an interface equipped with physical operating parts such as a mouse and a keyboard. For example, an example of an input interface also includes an electrical signal processing circuit that receives an electrical signal corresponding to an input operation from an external input device provided separately from the device and outputs this electrical signal to a control circuit.

The memory 41 stores a weight correspondence table that includes a list of the names of multiple accessories (hereinafter, assumed accessories) that are assumed to be placed on the top board 33 during image diagnosis, and the weights (hereinafter, specified weights) corresponding to the assumed accessories. Figure 2 is a diagram showing an example of the contents of the weight correspondence table. In addition to the names and specified weights of the assumed accessories, the weight correspondence table also includes abbreviations and image data. The weight correspondence table is an example of a list of specified weights.

The memory 41 stores, for example, the names of expected accessories, such as "syringe pump," "drain bag," "urine collection bag," "bedside monitor," "medical oxygen cylinder," "backboard," and "infusion." The expected accessories may be independently set according to the characteristics of the facility in which the X-ray CT scanner 1 is installed.

Memory 41 stores the abbreviations, image data, and weights corresponding to these assumed accessories. The abbreviations for "syringe pump," "drain bag," "urine collection bag," "bedside monitor," "medical oxygen cylinder," "backboard," and "infusion" are "SP," "DB," "LU," "SM," "OB," "BB," and "LT," respectively. The image data is data that shows the appearance of each of the assumed accessories.

For example, the memory 41 stores the weight of the "syringe pump" as XX (g) and the weight of the "drain bag" as XX (g). The memory 41 stores multiple specified weights of assumed accessories. The memory 41 is an example of a storage unit. An accessory is an example of an object. The weight of an assumed accessory is a fixed numerical value.

The syringe pump is a device used when precise control of the injection speed of a drug is required. The syringe pump may be temporarily unplugged and left on the top plate 33 while being photographed by the X-ray CT scanner 1 (hereinafter referred to as CT photography). The number of syringe pumps mounted on the top plate 33 may vary depending on the subject P.

The drain bag is a device for draining bodily fluids from the subject P to the outside of the body. Because the tube of the drain bag is short, the drain bag may be placed on the top plate 33 when performing image diagnosis of the subject P using the X-ray CT device 1. The urine collection bag is a bag for collecting urine discharged from the patient. The urine collection bag may be placed on the top plate 33 when performing image diagnosis of the subject P using the X-ray CT device 1.

The bedside monitor is a monitor that displays the measurement results of the subject P, such as the electrocardiogram, blood oxygen concentration, respiration, and blood pressure. The bedside monitor may be attached to the subject P during centralized management, and is often mounted on the top plate 33 of the X-ray CT scanner 1. The medical oxygen cylinder is a cylinder that stores oxygen to be supplied to the subject P. For example, a medical oxygen cylinder may be used by a subject P with a respiratory disease when going out, and is connected to a mask worn by the subject P. When performing CT imaging, the oxygen cylinder connected to the mask worn by the subject P is switched to an oxygen cylinder installed in the examination room, but the medical oxygen cylinder may also be used as is. In this case, the medical oxygen cylinder is mounted, for example, on the top plate 33.

The backboard is a board for immobilizing the subject P when a high-energy injury occurs in a traffic accident or the like. A subject P who has sustained a high-energy injury and is urgently transported is transported while being fixed to the backboard, for example. The transported subject P moves with the backboard attached to the top plate 33 of the bed device 30, for example.

The infusion is a so-called drip, and is a bag containing the liquid medicine to be injected into the subject P. The infusion is hung, for example, from a so-called drip pole, and during image diagnosis using the X-ray CT scanner 1, the drip pole is attached to the bed device 30. Therefore, the infusion hanging from the drip pole also becomes an accessory mounted on the tabletop 33. The weight of the infusion is the sum of the weight of the liquid medicine and the weight of the bag. The weights of the above accessories are, for example, all fixed values.

The display 42 displays a message for the operator, for example, before starting image diagnosis using the X-ray CT device 1. The display 42 displays, for example, the abbreviations, names, and weights of assumed accessories mounted on the top board 33, the measured weight of the subject P, etc. The display 42 is an example of a display unit.

The processing circuitry 50 controls the overall operation of the X-ray CT device 1. The processing circuitry 50 includes, for example, a control function 51, a preprocessing function 52, a reconstruction processing function 53, an image processing function 54, a first acquisition function 55, a recognition function 56, a second acquisition function 57, a calculation function 58, and a display control function 59. The processing circuitry 50 realizes these functions by, for example, a hardware processor executing a program stored in a storage device (storage circuit).

The hardware processor refers to a circuit such as a CPU, GPU, application specific integrated circuit, programmable logic device or composite programmable logic device, or field programmable gate array. Instead of storing the program in a memory device, the program may be directly embedded in the circuit of the hardware processor. The hardware processor is not limited to being configured as a single circuit, but may be configured as a single hardware processor by combining multiple independent circuits to realize each function. The memory device may be a non-transitory (hardware) storage medium. In addition, multiple components may be integrated into a single hardware processor to realize each function.

Each component of the console device 40 or the processing circuit 50 may be distributed and realized by multiple pieces of hardware. The processing circuit 50 may be realized by a processing device capable of communicating with the console device 40, rather than being a component of the console device 40. The processing device is, for example, a workstation connected to one X-ray CT device, or a device (e.g., a cloud server) connected to multiple X-ray CT devices and collectively executing processing equivalent to that of the processing circuit 50 described below.

The functions included in the processing circuit 50 may be distributed among multiple circuits, or may be made available by starting application software stored in the memory 41. For example, the control function 51, preprocessing function 52, reconstruction processing function 53, and image processing function 54 may be included in the processing circuit 50, and the first acquisition function 55, recognition function 56, second acquisition function 57, calculation function 58, and display control function 59 may be made available by starting application software stored in the memory 41.

The control function 51 controls various functions of the processing circuit 50 based on the input operations received by the input interface 43. For example, the control function 51 controls the X-ray high voltage device 14, the DAS 16, the control device 18, and the bed driving device 32 to perform the collection process of the detection data in the gantry device 10, etc.

The pre-processing function 52 performs pre-processing such as logarithmic conversion, offset correction, inter-channel sensitivity correction, and beam hardening correction on the detection data output by the DAS 16, generates projection data, and stores the generated projection data in the memory 41.

The reconstruction processing function 53 performs reconstruction processing using a filtered backprojection method, an iterative reconstruction method, or the like on the projection data generated by the preprocessing function 52 to generate CT image data, and stores the generated CT image data in the memory 41.

The image processing function 54 converts the CT image data into three-dimensional image data or cross-sectional image data of an arbitrary cross section by a known method based on the input operation received by the input interface 43. The conversion into three-dimensional image data may be performed by the pre-processing function 52.

The first acquisition function 55 receives detection values transmitted by the first load sensor 35A and the second load sensor 35B of the load sensor 35. The first acquisition function 55 calculates and acquires the load acting on the entire tabletop 33 (hereinafter, the total load) based on the received detection values. The first acquisition function 55 outputs the acquired total load to the calculation function 58 and the display control function 59. The first acquisition function is an example of a first acquisition unit.

The recognition function 56 receives an electrical signal of an image transmitted by the camera unit 20. The recognition function 56 recognizes an assumed accessory (hereinafter, a mounted accessory) mounted on the tabletop 33 by image processing an image based on the received electrical signal. The recognition function 56 outputs accessory information corresponding to the recognized mounted accessory to the second acquisition function 57. The recognition function 56 is an example of a recognition section.

The second acquisition function 57 references the accessory information output by the recognition function 56 to the weight correspondence table shown in FIG. 2 stored in the memory 41, and acquires the name, image data, and specified weight of the accessory corresponding to the accessory information. The second acquisition function 57 outputs the acquired name and image data of the accessory to the display control function 59. The second acquisition function 57 outputs the acquired specified weight to the calculation function 58 and the display control function 59. The second acquisition function 57 is an example of a second acquisition unit.

The calculation function 58 calculates the weight of the subject P based on the total load output by the first acquisition function 55 and the specified weight of the accessories. For example, the calculation function 58 calculates the weight of the subject P by subtracting the total weight, which is the sum of the specified weights of all mounted accessories, from the total load and calculating the result as the measurement result of the weight of the subject P. The calculation function 58 is an example of a calculation unit.

The calculation function 58 further calculates the amount of contrast agent to be administered to the subject P based on the calculated weight of the subject P. The amount of contrast agent is calculated, for example, using a formula that uses the weight of the subject P as a variable. The amount of contrast agent may be determined in advance according to the weight of the subject P. The calculation function 58 outputs the calculated weight of the subject P and the amount of contrast agent to be administered to the subject P to the display control function 59.

The display control function 59 controls the display on the display 42 of the name, image data, and specified weight of the accessory output by the second acquisition function 57, and an image showing the weight of the subject P and the amount of contrast agent to be administered to the subject P output by the calculation function 58. Figure 3 shows an example of an image displayed on the display 42 before the start of image diagnosis.

Before starting image diagnosis using the X-ray CT device 1, the display control function 59 controls the display 42 to display a message field GA1, an accessory weight display field GA2, a subject weight display field GA3, and a contrast agent amount display field GA4. The display control function 59 displays a predetermined message in the message field GA1, in this case the message "Preparing for imaging. Please check the subject's weight and the amount of contrast agent."

The display control function 59 displays the abbreviation, image, and weight of the mounted accessory on the display 42 in the accessory weight display field GA2. Regarding the weight of the mounted accessory, if there is more than one mounted accessory, the individual weight of each mounted accessory and the total weight of all mounted accessories are displayed. The display control function 59 displays the weight of the subject P in the subject weight display field GA3. The display control function 59 displays the amount of contrast agent to be administered to the subject P in the contrast agent amount display field GA4. The display control function 59 is an example of a display control unit.

Next, the process before image diagnosis is performed by the X-ray CT device 1 will be described. FIG. 4 is a flow chart showing an example of the process before image diagnosis is performed by the X-ray CT device 1. In the process before image diagnosis is performed by the X-ray CT device 1, the subject P is first placed on the top board 33 of the bed device 30 (step S1).

Next, when the subject is placed on the tabletop 33, the camera unit 20 captures an image of the tabletop 33 (step S3). The camera unit 20 transmits an electrical signal of the captured image including the appendage to the processing circuit 50 of the console device 40. Figure 5 is a diagram showing an example of the state in which the camera captures an image of the tabletop 33.

Of the camera units 20 provided on the gantry 10, the first camera 21 is mounted near the top end of the gantry 10, and the second camera 22 is mounted near one side end of the gantry 10, for example, the left end. The first camera 21 captures an image of the tabletop 33 from above, and the second camera 22 captures an image of the upper part of the tabletop 33 from the side. From the images captured by the first camera 21 and the second camera 22, a first accessory F1 and a second accessory F2 around the subject P are detected.

Next, the load sensor 35 detects the load on the bed using the first load sensor 35A and the second load sensor 35B (step S5). Next, the load sensor 35 transmits electrical signals of the loads detected by the first load sensor 35A and the second load sensor 35B to the processing circuit 50 of the console device 40.

The processing circuitry 50 of the console device 40 calculates the weight of the subject P using the image based on the electrical signal transmitted by the camera unit 20 and the load indicated by the electrical signal transmitted by the load sensor 35 (step S7). The procedure for calculating the weight of the subject P will be described later. After calculating the weight of the subject P, the calculation function 58 determines the amount of contrast agent to be administered to the subject P based on the calculated weight of the subject P (step S9).

Then, the calculation function 58 outputs the calculated amount of contrast agent to be administered to the subject P to the display control function 59. The display control function 59 displays the amount of contrast agent to be administered to the subject P output by the calculation function 58 on the display 42 together with the weight of the subject P (step S11). After that, the X-ray CT apparatus 1 ends the process shown in FIG. 4.

Next, the procedure for calculating the weight of the subject P in step S7 will be described. FIG. 6 is a flow chart showing an example of the procedure for calculating the weight of the subject P. The first acquisition function 55 in the processing circuit 50 receives electrical signals of the loads detected by the first load sensor 35A and the second load sensor 35B transmitted by the load sensor 35 (step S101). Next, the first acquisition function 55 acquires the total load based on the load indicated by the received electrical signals (step S103). The first acquisition function 55 outputs the acquired total load to the second acquisition function 57 (step S105).

Then, the recognition function 56 receives the electrical signal of the image transmitted by the camera unit 20 (step S107). The recognition function 56 performs, for example, template matching on the image based on the received electrical signal, and recognizes the mounted accessory contained in the image (step S109). If the recognition function 56 is able to recognize the mounted accessory, it outputs accessory information to the second acquisition function 57 (step S111).

Next, the second acquisition function 57 refers to the weight correspondence table stored in the memory 41 for the accessory information output by the recognition function 56, and acquires the name, image data, and specified weight of the mounted accessory corresponding to the accessory information (step S113). Next, the second acquisition function 57 outputs the acquired name and image data of the mounted accessory to the display control function 59. The second acquisition function 57 outputs the acquired specified weight to the calculation function 58 and the display control function 59.

Then, the calculation function 58 calculates the total weight of the mounted accessories by adding up all the specified weights output by the second acquisition function 57 (step S115). The calculation function 58 then calculates the weight of the subject P by correcting the total load output by the first acquisition function 55 based on the total weight of the mounted accessories. For example, the calculation function 58 calculates the weight of the subject P by subtracting the calculated total weight of the mounted accessories from the total load output by the first acquisition function 55 (step S117).

The calculation function 58 outputs the calculated total weight of the mounted accessories and the calculated weight of the subject P to the display control function 59. The display control function 59 displays an image on the display 42 showing the name, image data, and specified weight of the mounted accessories output by the second acquisition function 57, and the weight of the subject P output by the calculation function 58 (step S119). After that, the X-ray CT device 1 ends the process shown in FIG. 6.

When measuring the weight of a subject P, the X-ray CT device 1 of the first embodiment detects any mounted accessories on the top plate 33 and corrects the overall load on the top plate 33 based on the weight of the detected mounted accessories. Therefore, even if accessories are mounted on the top plate 33, the weight of the subject P placed on the top plate 33 can be accurately measured.

Second Embodiment
Next, a second embodiment will be described. The second embodiment differs from the first embodiment mainly in that the processing circuit 50 of the X-ray CT device 1 is provided with a determination function 60 for determining whether the weight of the mounted accessory is accurate. Furthermore, the second embodiment differs from the first embodiment in that the mounted accessory and its weight, etc. can be input by operating the input interface 43. Below, the second embodiment will be described focusing on the differences from the first embodiment. Descriptions of elements, etc. common to the first embodiment may be omitted. The same applies to the other embodiments below.

Figure 7 is a diagram showing an example of the processing circuitry 50 in the X-ray CT apparatus 1 of the second embodiment. The processing circuitry 50 includes a determination function 60 in addition to the control function 51 to the display control function 59 of the first embodiment. The recognition function 56 recognizes the mounted accessory based on the image transmitted by the camera unit 20, and outputs accessory information of the recognized mounted accessory to the determination function 60.

The determination function 60 determines whether the mounted accessories include any accessories whose weight is not fixed, for example accessories whose specified weight is variable (hereinafter, variable accessories). The determination function 60 is an example of a determination unit. In the following description, an assumed accessory whose specified weight is variable is called a variable accessory, whereas an assumed accessory whose specified weight is constant is called a constant accessory.

The weight correspondence table stored in the memory 41 of the X-ray CT device 1 of the second embodiment differs from the weight correspondence table of the first embodiment. FIG. 8 is a diagram showing an example of the contents of the weight correspondence table of the second embodiment. The weight correspondence table of the second embodiment further includes information on whether the assumed attachment is variable or unchanging.

Specifically, the weights of the "syringe pump," "drain bag," "urine collection bag," "medical oxygen cylinder," "backboard," and "infusion" can change depending on the condition of subject P, etc., so the specified weights of these assumed accessories are variable. Therefore, the "syringe pump," "drain bag," "urine collection bag," "medical oxygen cylinder," "backboard," and "infusion" correspond to variable accessories. The weights of the "bedside monitor" and "backboard" are constant regardless of the condition of subject P, so the specified weights of these assumed accessories are unchanging. Therefore, the "bedside monitor" and "backboard" correspond to unchanging accessories.

When the on-board attachments include a variable attachment, the determination function 60 outputs warning information to the display control function 59, warning that the weight of the subject cannot be calculated because the on-board attachments include a variable attachment. When the warning information is output, the display control function 59 displays a warning image on the display 42. The warning image also includes an image that prompts the user to input the weight of the variable attachment. The warning image is an example of a warning display.

Figure 9 is a diagram showing an example of a warning image displayed on the display 42. In the warning image, the display control function 59 displays the message "Weight cannot be measured because the weight of the drain bag (DB) mounted on the bed is unknown. Please enter the weight" in the message field GA1 together with the word "Warning". "Drain bag (DB)" displayed in the message field GA1 is an example of second specific information. "Drain bag (DB) weight is unknown" displayed in the message field GA1 is an example of reason information indicating the reason why the weight of the object was determined to be inaccurate.

The display control function 59 displays an image prompting input of the weight of the mounted accessory to be displayed in the accessory weight display field GA2, for example, for a drain bag (DB), which is a variable accessory, and displays the weight shown in the weight correspondence table for a bedside monitor (SM), which is an invariable accessory. The display control function 59 displays "- " in the total weight field, indicating that the weight of the invariable accessory is undetermined, until the weight of the invariable accessory is input. The display control function 59 similarly displays "- " in the subject weight display field GA3 and contrast agent amount display field GA4, indicating that the weight of the invariable accessory is undetermined, until the weight of the invariable accessory is input.

The display control function 59 may display, in the warning image, a table (hereinafter, the variable accessory weight correspondence table) that associates the causes of fluctuations in the weight of the variable accessory with the weight of the variable accessory. FIG. 10 is a diagram showing an example of the variable accessory weight correspondence table. The causes of the variable accessory shown in the variable accessory weight correspondence table are, for example, the amount of medicine when the variable accessory is a syringe pump, the amount of bodily fluids when the variable accessory is a drain bag, and the amount of urine when the variable accessory is a urine collection bag. When displaying the variable accessory weight correspondence table on the display 42, the display control function 59 may display the entire variable accessory weight correspondence table, or may display only the portion that corresponds to the mounted accessory.

In the X-ray CT device 1 of the second embodiment, the input interface 43 accepts input operations by the operator to input information such as the name of the intended accessory that specifies the mounted accessory (hereinafter, designated information) and information such as the weight of the mounted accessory. For example, it is assumed that the operator visually confirms that the mounted accessory is not included in the image captured by the camera unit 20 before starting image diagnosis using the X-ray CT device 1.

In this case, imaging by the camera unit 20 may be repeated until the recognition function 56 recognizes the mounted accessory, or the operator may input the specified information into the input interface 43. The specified information is an example of first specified information. The first specified information may be something other than the name of the expected accessory, and may be, for example, a serial number assigned to each expected accessory. The input interface 43 is an example of a first reception section and a second reception section.

The operator, for example, compares the image displayed on the display 42 shown in FIG. 3 with the mounted accessories that are actually mounted on the tabletop 33, and confirms that all mounted accessories that are actually mounted on the tabletop 33 are displayed on the display 42. If the operator confirms that there is a mounted accessory that is actually mounted on the tabletop 33 but is not displayed on the display 42, he or she performs an input operation to specify the mounted accessory.

When the input interface 43 receives an input operation for specified information, it outputs an electrical signal indicating the received specified information to the processing circuit 50. The processing circuit 50 recognizes the mounted accessory using the recognition function 56 based on the output electrical signal, and outputs accessory information corresponding to the recognized mounted accessory to the second acquisition function 57 and the determination function 60.

If the determination function 60 determines that the mounted accessories do not include variable accessories, the second acquisition function 57, as in the first embodiment, refers to the accessory information of the invariable accessories output by the recognition function 56 in the weight correspondence table to obtain the specified weight corresponding to the accessory information. If the determination function 60 determines that the mounted accessories include variable accessories, the input interface 43 accepts an input operation to input information specifying the weight of the mounted accessories (hereinafter, weight information).

When the input interface 43 receives an input operation for weight information, it outputs an electrical signal indicating the received weight information to the processing circuit 50. Based on the output electrical signal, the second acquisition function 57 of the processing circuit 50 acquires the weight specified by the operator's input operation as the weight of the mounted accessory.

The operator further compares the image displayed on the display 42 shown in FIG. 3 with the accessories actually mounted on the tabletop 33 to confirm whether any accessories other than the expected accessories (hereinafter, unexpected accessories) are mounted on the tabletop 33. If the operator confirms that unexpected accessories are mounted on the tabletop 33, he or she performs an input operation to indicate the presence of unexpected accessories and to specify the weight of the unexpected accessories.

Next, the procedure for calculating the weight of the subject P in the X-ray CT apparatus 1 of the second embodiment will be described. FIG. 11 is a flow chart showing an example of the procedure for calculating the weight of the subject P in the second embodiment. The processes from the process in which the first acquisition function 55 receives an electrical signal of the load (step S201) to the process in which the accessory information is recognized (step S209) are the same as the processes from step S101 to step S109 in the first embodiment. In step S211, if the recognition function 56 is able to recognize the mounted accessory, it outputs the accessory information to the second acquisition function 57 as well as the determination function 60.

Next, the second acquisition function 57 refers to the weight correspondence table shown in FIG. 8 for the mounted accessories recognized by the recognition function 56, and acquires the names of the mounted accessories (step S213). Next, the determination function 60 refers to the weight correspondence table shown in FIG. 8 for the mounted accessories recognized by the recognition function 56, and determines whether the mounted accessories include a variable accessory (step S215).

If the determination function 60 determines that a variable attachment is included, the display control function 59 displays a warning image on the display 42 to encourage the operator to input the weight of the variable attachment (step S217). The operator who sees the warning image estimates the weight of the variable attachment. For example, if the variable attachment is a drainage bag, the operator visually checks the amount of bodily fluid contained in the drainage bag and estimates the weight of the drainage bag from the amount of bodily fluid. The operator performs an input operation to input the estimated weight of the drainage bag.

The second acquisition function 57 then determines whether or not an input operation for the weight of the variable attachment has been performed within the specified time (step S219). If an input operation for the weight of the variable attachment has been performed within the specified time, the second acquisition function 57 acquires the weight corresponding to the input operation as the weight of the variable attachment (step S221). If no input operation has been performed within the specified time, the second acquisition function 57 acquires the specified weight shown in the weight correspondence table as the weight of the variable attachment (step S223).

Similarly, if it is determined in step S215 that no variable attachment is included, the second acquisition function 57 acquires the specified weight shown in the weight correspondence table as the weight of the mounted attachment (step S223). Next, the second acquisition function 57 outputs the acquired name and image data of the mounted attachment to the display control function 59. The second acquisition function 57 outputs the acquired specified weight to the calculation function 58 and the display control function 59.

Next, the calculation function 58 calculates the total weight of the mounted accessories by adding up all the specified weights output by the second acquisition function 57 (step S225). Next, the calculation function 58 calculates the weight of the subject P by subtracting the calculated total weight of the mounted accessories from the total load output by the first acquisition function 55 (step S227).

The calculation function 58 outputs the calculated total weight of the mounted accessories and the calculated weight of the subject P to the display control function 59. The display control function 59 displays on the display 42 a confirmation image showing the name, image data, and specified weight of the mounted accessories output by the second acquisition function 57, and the weight of the subject P output by the calculation function 58 (step S229).

Figure 12 is a diagram showing an example of a confirmation image displayed on the display 42. Here, the display control function 59 displays a message in the message field GA1 saying, "Please check the amount of weight contrast agent for the subject. If the weight of the loaded item is different or if there is another loaded item, press the correction button. If it is correct, press the confirmation button."

The display control function 59 displays the individual weights of the mounted accessories and the total weight of all mounted accessories in the accessory weight display field GA2, the weight of the subject P in the subject weight display field GA3, and the amount of contrast agent to be administered to the subject P in the contrast agent amount display field GA4. The display control function 59 further displays a correction button GA5 and a confirmation button GA6 on the display 42. The correction button GA5 is a GUI image on which the word "correct" is displayed, and the confirmation button GA6 is a GUI image on which the word "correct" is displayed.

When the operator operates the correction button GA5, the input interface 43 accepts the input operation of the operator. When the input interface 43 accepts the input operation of the correction button GA5, it outputs an electrical signal corresponding to the input operation of the correction button GA5 to the processing circuit 50. When the operator operates the confirmation button GA6, the input interface 43 accepts the input operation of the operator. When the input interface 43 accepts the input operation of the confirmation button GA6, it outputs an electrical signal corresponding to the input operation of the confirmation button GA6 to the processing circuit 50.

After displaying the confirmation image, the display control function 59 determines whether or not an input operation of the Confirm button GA6 has been performed based on whether or not an electrical signal that accepts an input operation of the Confirm button GA6 has been received (step S231). If it is determined that an input operation of the Confirm button has not been performed, the display control function 59 determines whether or not an input operation of the Correction button GA5 has been performed (step S235). If it is determined that an input operation of the Correction button GA5 has not been performed, the display control function 59 returns to the processing of step S231, and repeats the processing of steps S231 and S233 until an input operation of either the Correction button GA5 or the Confirm button GA6 is performed.

If it is determined that an input operation of the correction button GA5 has been performed, the display control function 59 advances the process to step S217 and displays a warning image on the display 42. The warning image displayed after an input operation of the correction button GA5 has been performed differs from the warning image displayed after it is determined that the mounted accessories include a variable accessory.

Figure 13 is a diagram showing an example of an image displayed on the display 42 after an input operation of the correction button GA5. Here, the display control function 59 displays the message "Please correct the weight. If other objects are loaded on the bed, please add the loaded object" in the message field GA1. The display control function 59 indicates that the weight of each loaded accessory can be modified by enclosing the weight of a variable accessory in a first frame GA21 in the accessory weight display field GA2. Furthermore, if the loaded accessory is an accessory other than an expected accessory, a second frame GA22 is displayed in the accessory weight display field GA2 as a field for inputting the weight.

When the operator inputs weight into the first frame GA21 and the second frame GA22, the input interface 43 accepts the input operation by the operator. The input interface 43 outputs an electrical signal corresponding to the weight information input into the first frame GA21 and the second frame GA22 to the processing circuit 50. After the display control function 59 displays a warning image, the second acquisition function 57 determines whether or not an input operation regarding the weight of the variable attachment has been performed within a specified time (step S219), and thereafter executes the above-mentioned processing. In step S219, if an input operation into the second frame GA22 has not been performed within the specified time, the second frame GA22 is erased and the process proceeds to step S225.

If it is determined in step S231 that the Confirm button GA6 has been operated, the X-ray CT device 1 confirms the weight of the subject P (step S233). After that, the X-ray CT device 1 ends the process shown in FIG. 11.

The X-ray CT device 1 of the second embodiment has the same effect as the X-ray CT device 1 of the first embodiment. Furthermore, when the mounted accessory is a variable accessory and the weight of the subject P cannot be measured, the X-ray CT device 1 of the second embodiment displays warning information to prompt the input of the weight of the variable accessory. Furthermore, when an accessory other than the expected accessory is mounted on the top board 33, the input of the weight of the accessory other than the expected accessory is prompted. Therefore, the weight of the mounted accessory can be accurately recognized, and the weight of the subject P can be measured more accurately.

Third Embodiment
Next, a third embodiment will be described. The X-ray CT apparatus 1 of the third embodiment differs from the first embodiment mainly in the processing before the subject P is placed on the bed and the handling of information obtained by the processing before the subject P is placed on the bed. The third embodiment will be described below, focusing on the differences from the first embodiment.

In the X-ray CT scanner 1 of the third embodiment (see FIG. 1), a headrest and footrest (hereinafter, headrest, etc.) are removably attached to the top plate 33. When performing image diagnosis using the X-ray CT scanner 1, a task of preparing for diagnosis (hereinafter, diagnosis preparation task) is performed by attaching or detaching the headrest, etc. to the top plate 33 according to the body shape, etc., of the subject P. The diagnosis preparation task is performed before the subject P is placed on the top plate 33. In the diagnosis preparation task, the headrest, etc. is attached or detached as necessary, and is not attached or detached if it is not required. The headrest, etc. are accessories (hereinafter, pre-mounted items) that are attached to the top plate 33 before the subject P is placed on the top plate 33.

In the X-ray CT device 1 of the third embodiment, before the subject P is placed on the top plate 33, the mounted object is recognized. When calculating the weight of the subject P, the X-ray CT device 1 uses information of the recognized mounted object. The processing in the X-ray CT device 1 of the third embodiment will be described below. FIG. 14 is a flowchart showing an example of processing in a stage before image diagnosis is performed by the X-ray CT device 1 of the third embodiment.

When performing image diagnosis using the X-ray CT device 1, the operator performs diagnostic preparation work (step S21). In the diagnostic preparation work, a headrest and the like are attached or removed depending on the body shape of the subject who is the subject of the image diagnosis. Next, the camera unit 20 captures an image of the top plate 33 before the subject P is placed on the top plate 33 (hereinafter, a pre-image) (step S23).

If a headrest or the like is attached in the diagnostic preparation work, the image of the top plate 33 captured on the top plate 33 includes the headrest or the like. If a headrest or the like is removed in the diagnostic preparation work, the image of the top plate 33 does not include the headrest or the like. The image of the top plate 33 captured here does not include the subject P. The camera unit 20 transmits an electrical signal of the captured image to the processing circuit 50 of the console device 40.

The load sensor 35 then detects the load (hereinafter, pre-load) applied to the bed before the subject P is placed on the top board 33 using the first load sensor 35A and the second load sensor 35B (step S25). The load sensor 35 transmits electrical signals of the loads detected by the first load sensor 35A and the second load sensor 35B to the processing circuit 50 of the console device 40. The subject P is then placed on the top board 33 of the bed device 30 (step S27).

Next, as in the first embodiment described above, when the subject is placed on the tabletop 33, the camera unit 20 captures an image of the tabletop 33 (step S29) and transmits an electrical signal of the captured image including the appendage to the processing circuit 50 of the console device 40. The load sensor 35 detects a pre-load by the first load sensor 35A and the second load sensor 35B (step S31) and transmits an electrical signal of the detected load to the processing circuit 50 of the console device 40.

The processing circuit 50 of the console device 40 calculates the weight of the subject P using the images before and after placing the subject P based on the electrical signal transmitted by the camera unit 20 and the load before and after placing the subject P indicated by the electrical signal transmitted by the load sensor 35 (step S33). The procedure for calculating the weight of the subject P will be described later. After calculating the weight of the subject P, the calculation function 58 determines the amount of contrast agent to be administered to the subject P based on the calculated weight of the subject P (step S35). Next, the display control function 59 displays the amount of contrast agent to be administered to the subject P on the display 42 (step S37). After that, the X-ray CT device 1 ends the process shown in FIG. 14.

Next, a procedure for calculating the weight of the subject P in the X-ray CT device 1 of the third embodiment will be described. FIG. 15 is a flow chart showing an example of a procedure for calculating the weight of the subject P in the X-ray CT device 1 of the third embodiment. In the X-ray CT device 1 of the third embodiment, first, the first acquisition function 55 receives an electrical signal of the pre-load transmitted by the load sensor 35 after the diagnostic preparation work is completed on the top board 33 (step S301). The first acquisition function 55 calculates and acquires the load of the pre-loaded object (hereinafter, the pre-loaded object load) after the diagnostic preparation work based on the electrical signal of the pre-load (step S303). The first acquisition function 55 outputs the acquired pre-loaded object load to the calculation function 58 (step S303).

Then, the recognition function 56 receives the electrical signal of the preliminary image transmitted by the camera unit 20 (step S305). Based on the received preliminary image, the recognition function 56 recognizes the pre-mounted objects contained in the preliminary image (step S307). The recognition function 56 outputs pre-mounted object information corresponding to the recognized pre-mounted objects to the calculation function 58 (step S307). The processing up to this point is processing executed during the diagnosis preparation work.

Next, after the diagnostic preparation work is completed, the subject P is placed on the top board 33 of the bed device 30 (step S309). Next, the camera unit 20 captures an image of the top board 33 and transmits an electrical signal of the captured image to the processing circuitry 50 (step S311). Next, the load sensor 35 detects the load on the bed and transmits an electrical signal of the detected load to the processing circuitry 50 of the console device 40 (step S311). The processing from step S309 to step S311 is the same as the processing from step S1 to step S5 of the first embodiment.

Then, the first acquisition function 55 receives an electrical signal of the load detected by the load sensor 35, and acquires the total load based on the load indicated by the received electrical signal (step S313). The first acquisition function 55 outputs the acquired total load to the second acquisition function 57 (step S313). The recognition function 56 then receives an electrical signal of the image transmitted by the camera unit 20, and recognizes the mounted accessory included in the image based on the received electrical signal (step S315). If the recognition function 56 is able to recognize the mounted accessory, it outputs accessory information to the second acquisition function 57 (step S315).

Next, the second acquisition function 57 acquires the name, image data, and specified weight of the mounted accessory corresponding to the accessory information output by the recognition function 56 (step S317), and outputs the acquired name and image data of the mounted accessory to the display control function 59. The second acquisition function 57 outputs the acquired specified weight to the calculation function 58 and the display control function 59. Next, the calculation function 58 adds up all the specified weights output by the second acquisition function 57 to calculate the total weight of the mounted accessories (step S319). The processing up to this point is common to steps S101 to S115 of the first embodiment.

Then, the calculation function 58 determines whether or not there is a pre-installed object among the on-board accessories based on the pre-installed object information output by the recognition function (step S321). If it is determined that there is a pre-installed object, the calculation function 58 subtracts the pre-installed object load from the total load (step S323). Next, the calculation function 58 calculates the total weight of the subject P by subtracting the total weight of the on-board accessories from the total load obtained by subtracting the pre-installed object load (step S325). If it is determined that there is no pre-installed object, the calculation function 58 calculates the total weight of the subject P by subtracting the total weight of the on-board accessories from the total load (step S325).

The calculation function 58 outputs the calculated total weight of the mounted accessories and the calculated weight of the subject P to the display control function 59. The display control function 59 displays an image on the display 42 showing the name, image data, and specified weight of the mounted accessories output by the second acquisition function 57, and the weight of the subject P output by the calculation function 58 (step S327). After that, the X-ray CT device 1 ends the process shown in FIG. 15.

The X-ray CT device 1 of the third embodiment has the same effect as the X-ray CT device 1 of the first embodiment. Furthermore, when there is a pre-loaded object, the X-ray CT device 1 of the third embodiment calculates the weight of the subject by subtracting the weight of the pre-loaded object. Therefore, even if a headrest or the like is mounted on the tabletop 33 as a pre-loaded object, the weight of the subject can be accurately measured.

Below, a modified example will be described. In the modified X-ray CT apparatus 1, the weight of the subject declared in advance (hereinafter, the declared weight) may be displayed as an image on the display 42 along with the weight of the subject. FIG. 16 is a diagram showing an example of a warning image including declared information displayed on the display 42. In this example, a declared weight display field GA7 is provided between the subject weight display field GA3 and the contrast agent amount display field GA4, and the declared weight is displayed in the declared weight display field GA7. By displaying the declared weight, the operator can compare the declared weight with the subject weight, so that if an abnormality occurs in the measured subject weight, the operator can easily recognize the abnormality.

Although multiple embodiments and variations of the first to third embodiments have been described above, the elements of these embodiments and variations may be combined or interchanged as appropriate. Furthermore, in each of the above embodiments, an X-ray CT device 1 is exemplified as a medical image diagnostic device, but the medical image diagnostic device may be another device. As a medical image diagnostic device, for example, a PET (positron emission tomography)-CT device, an MRI (magnetic resonance imaging) device, an XR device, an angiography probe, etc. may be used.

According to at least one of the embodiments described above, the weight of the subject placed on the bed can be accurately measured by having a first acquisition unit that acquires the load applied to the bed on which the subject to be imaged is placed, a recognition unit that recognizes an object placed on the bed, a second acquisition unit that acquires the weight of the object, and a calculation unit that calculates the weight of the subject on the bed based on the load and the weight of the object.

Although several embodiments have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are within the scope of the invention and its equivalents as set forth in the claims, as well as the scope and spirit of the invention.

1... X-ray CT device 10... gantry device 11... X-ray tube 12... wedge 13... collimator 14... X-ray high voltage device 15... X-ray detector 16... DAS
17...Rotating frame 18...Control device 20...Camera unit 21...First camera 22...Second camera 30...Ced device 31...Base 32...Ced drive device 33...Tabletop 34...Support frame 35...Load sensor 35A...First load sensor 35B...Second load sensor 40...Console device 41...Memory 42...Display 43...Input interface 50...Processing circuit 51...Control function 52...Pre-processing function 53...Reconstruction processing function 54 ...Image processing function 55...First acquisition function 56...Recognition function 57...Second acquisition function 58...Calculation function 59...Display control function 60...Determination function F1...First accessory F2...Second accessory GA1...Message field GA2...Accessory weight display field GA3...Subject weight display field GA4...Contrast agent amount display field GA5...Correction button GA6...Confirm button GA7...Declared weight display field GA21...First frame GA22...Second frame P...Subject SM...Bedside monitor

Claims (12)

a first acquisition unit that acquires a load acting on a bed on which a subject to be imaged is placed;
a recognition unit that recognizes an object placed on the bed;
A second acquisition unit that acquires a weight of the object;
a calculation unit that calculates a weight of the subject on the bed based on the load and a weight of the object;
a display control unit that causes a display unit to display the weight of the subject calculated by the calculation unit,
The display control unit further causes the display unit to display at least one of first identification information identifying the object or a weight of the object acquired by the second acquisition unit;
a list of prescribed weights of a plurality of objects assumed to be placed on the bed during the image diagnosis includes information on whether the weights of the objects are variable or constant;
a determination unit that determines whether the weight of the object recognized by the recognition unit is variable or constant,
When the determination unit determines that the weight of the object is variable, the display unit displays a warning.
Medical imaging diagnostic equipment. The calculation unit further calculates an amount of a contrast agent to be administered to the subject based on a weight of the subject;
The display control unit further causes the display unit to display the amount of the contrast agent.
The medical image diagnostic apparatus according to claim 1 . The display control unit further causes the display unit to display a declared weight previously declared by the subject as the weight of the subject.
3. The medical image diagnostic apparatus according to claim 1 or 2 . The warning display is at least one of second identification information that identifies the object recognized by the recognition unit as having a variable weight or reason information that indicates a reason why the weight of the object is determined to be inaccurate.
The medical image diagnostic apparatus according to claim 1 . a first reception unit that receives an input of first identification information that identifies the object,
The medical image diagnostic apparatus according to any one of claims 1 to 4 . Further comprising a second reception unit that receives an input of the weight of the object.
The medical image diagnostic apparatus according to claim 1 . The recognition unit recognizes the object based on an image captured by a camera that captures an image of the bed on which the subject is placed.
The medical image diagnostic apparatus according to claim 1 . The camera is disposed above the bed.
The medical image diagnostic apparatus according to claim 7 . the calculation unit calculates a weight of the subject based on a weight of a pre-loaded object when the pre-loaded object is loaded on the bed before the subject is placed on the bed.
The medical image diagnostic apparatus according to claim 1 . The pre-installed object is at least one of a headrest and a footrest.
The medical image diagnostic apparatus according to claim 9 . The computer of the medical imaging diagnostic device
Acquire a load applied to a bed on which a subject to be image-diagnosed is placed;
Recognizing an object placed on the bed;
Obtaining a weight of the object;
Calculating a weight of the subject on the bed based on the load and the weight of the object;
Displaying the calculated weight of the subject on a display unit;
The computer,
further displaying at least one of first identification information identifying the object or the acquired weight of the object on the display unit;
a list of prescribed weights of a plurality of objects assumed to be placed on the bed during the image diagnosis includes information on whether the weights of the objects are variable or constant;
The computer,
determining whether the weight of the recognized object is variable or constant;
When it is determined that the weight of the object is variable, a warning is displayed.
Medical imaging diagnostic methods. For computers in medical imaging diagnostic equipment,
acquiring a load acting on a bed on which a subject to be image-diagnosed is placed;
Recognizing an object mounted on the bed;
obtaining a weight of the object;
Calculating a weight of the subject on the bed based on the load and the weight of the object;
Displaying the calculated weight of the subject on a display unit;
The computer includes:
causing the display unit to further display at least one of first identification information identifying the object or the acquired weight of the object;
a list of prescribed weights of a plurality of objects assumed to be placed on the bed during the image diagnosis includes information on whether the weights of the objects are variable or constant;
The computer includes:
determining whether the weight of the recognized object is variable or constant;
When it is determined that the weight of the object is variable, a warning is displayed.
program.

Images