JP2001149360A - X-ray diagnostic equipment - Google Patents

Abstract

(57) [Summary] To provide an X-ray diagnostic apparatus capable of controlling an optimal contrast agent injection and controlling an imaging operation for obtaining three-dimensional reconstruction data. SOLUTION: An ROI is set on an image, a change in pixel density in a region of interest is detected, and when the density exceeds a certain value, switching from fluoroscopy to imaging is performed. In addition, a system control unit 11 that can start rotating DSA imaging manually or under predetermined operating conditions is provided. Further, the injector 1
In conjunction with 4, the end time of the injection of the contrast medium by the injector 14 and the start timing of the fluoroscopic imaging are set. Also, rotating DSA
At the time of imaging, in order to prevent the contrast medium from disappearing from the target blood vessel region, the amount of the contrast medium and the injection speed are determined using an image obtained by injecting the contrast medium in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The X-ray diagnostic apparatus according to the present invention
The present invention relates to control of contrast agent injection for obtaining dimensional reconstruction data and control of imaging operation.

[0002]

2. Description of the Related Art Rotary DSA in a conventional X-ray diagnostic apparatus
The photographing is performed according to the procedure shown in FIG.

[0003] In conventional rotational DSA imaging, a contrast medium is a target part of ROI after injection of the contrast medium is started.
(Region Of Interest) is obtained by preliminary fluoroscopy or preliminary imaging. In this method, a contrast agent is injected once under preliminary fluoroscopy or preliminary imaging before rotational DSA imaging, and the operator measures the time with a clock while watching the image, or performs X-ray exposure timing based on intuition based on experience. And the contrast agent injection amount, injection speed, and the like.

Then, the data is input to an imaging protocol of the X-ray diagnostic apparatus, and the start and stop of the imaging are automatically performed. Further, when the injector of the contrast agent and the system are linked, the start and the end of the injection of the contrast agent by the injector are also controlled. However, there is no control means for the contrast medium injection amount and the injection speed. Further, when the system starts the DSA imaging sequence, the X-ray generation timing does not include any manual control means.

[0005]

The structure of the conventional X-ray diagnostic apparatus described above has the following problems.

[0006] Since the blood flow velocity varies depending on the individual difference of the patient, the target site, and the passage of time, it is difficult to determine the inflow velocity of the contrast agent by a conventional method that relies on intuition.

[0007] Further, due to a slight shift between the injection of the contrast medium and the start timing of imaging, the contrast medium may not be injected into a desired blood vessel region, which causes an artifact when reconstructed three-dimensionally.

Further, since the arm rotates at high speed, high rigidity and high driving force are required.

In addition, in the current apparatus, during the rotation DSA photographing, once the system enters the sequence controlled by the system, it is not possible to manually instruct the switching from the fluoroscopy to the photographing. And data collection does not go well.

[0010] Furthermore, since the optimum conditions for the amount and speed of injection of the contrast agent are not known, the result is that the contrast agent is injected longer and more frequently, and the degree of invasiveness to the patient tends to increase.

[0011]

In order to solve the above-mentioned problems, according to the present invention, image information obtained by irradiating X-rays before and after injection of a contrast agent into a subject is obtained. X-ray diagnostic apparatus for obtaining blood vessel strike information from an X-ray irradiation start instruction input means capable of manually instructing X-ray irradiation timing, and X-ray irradiation based on X-ray irradiation timing information set in advance. X-ray irradiation timing control means for performing X-ray irradiation,
X-ray irradiation method selecting means for selecting the start of X-ray irradiation using either one of the X-ray irradiation start instruction input means and the X-ray irradiation timing control means. The X-ray diagnostic apparatus described above is a solution.

In the present invention, the X-ray irradiation timing control means may include a predetermined ROI in the fluoroscopic image photographed by injecting a contrast agent in advance.
ROI designating means capable of designating an image, and a photographing start timing is determined based on a change amount of the image density value of the entire ROI designated by the ROI designating means or a change amount of the image density value of an arbitrary point in the ROI. The X-ray diagnostic apparatus according to claim 1, further comprising: an imaging start timing determination unit that performs the imaging start timing determination.

[0013] In the present invention, the photographing start timing determining means may detect a pixel value of an arbitrary point or a density change amount per unit time of the pixel value based on a detection result. The X-ray diagnostic apparatus according to claim 2, further comprising a fluoroscopy / imaging switching means for switching from fluoroscopy to imaging.

According to a fourth aspect of the present invention, there is provided an X-ray diagnostic apparatus capable of capturing a three-dimensional contrast image of a blood vessel of a subject. Area designating means capable of designating a target area on a perspective image, and density change detection for detecting a density change of a pixel value at the entire target area designated by the area designating means or at an arbitrary position in the target area. Means,
A photographing operation switching unit that switches from a fluoroscopic operation to a rotational photographing operation based on a result of comparing the state of filling of the contrast agent with a predetermined threshold based on the result of the density change detecting unit, in conjunction with the photographing operation switching unit At the same time, a narrowing-down means for narrowing down the X-ray diaphragm 12 to a predetermined position specified in advance is provided as an solving means by an X-ray diagnostic apparatus characterized by having a narrowing means.

According to a fifth aspect of the present invention, the photographing operation switching means includes a threshold value setting means capable of setting the threshold value to an arbitrary value. The X-ray diagnostic apparatus described above is a solution.

Further, in the present invention according to claim 6, the imaging operation switching means stops the injection operation of the contrast agent at the same time as the end of the rotation imaging operation or at a timing earlier by an arbitrary time than the end. The X-ray diagnostic apparatus according to claim 4 or 5 is provided with an injection control means, and is a solution means.

In the present invention, the photographing operation switching means may switch the detection gain of the detector to a predetermined value simultaneously with the switching operation from the fluoroscopic operation to the rotational photographing operation. The X-ray diagnostic apparatus according to any one of claims 4 to 6, further comprising a gain switching unit, is provided as a solution unit.

According to the present invention, there is provided an X-ray diagnostic apparatus capable of capturing a three-dimensional contrast image of a blood vessel of a subject. A fluoroscopic operation start means for setting an arm at a position to perform a fluoroscopic operation and injection of a contrast medium, and a fluoroscopic operation information inputting means capable of arbitrarily setting a timing of the fluoroscopic operation and the injection operation of the contrast medium by the fluoroscopic operation start means; An X-ray diagnostic apparatus, comprising: an operation order setting unit that can arbitrarily set an operation start order of a fluoroscopic operation and a contrast agent injection operation by the fluoroscopic operation starting unit.

Further, in the present invention as set forth in claim 9, the perspective operation information input means displays a state display on an image or a display device indicating that the operation can be shifted from the fluoroscopic operation to the start of imaging. An X-ray diagnostic apparatus according to claim 8 is provided as a means for solving the problem.

According to a tenth aspect of the present invention, there is provided an X-ray diagnostic apparatus capable of capturing a three-dimensional contrast image of a blood vessel of a subject. X-ray irradiation operation means that enables operation selection only in the following order; and enables selection of the contrast image shooting by the X-ray irradiation operation means only when the ROI density value exceeds a predetermined threshold value. An X-ray diagnostic apparatus comprising: an operation regulation control unit;

Further, according to the present invention, in an X-ray diagnostic apparatus capable of taking a three-dimensional contrast image of a blood vessel of a subject, a contrast image or a fluoroscopic image of the subject taken in advance is provided. Contrast agent injection start time, a contrast agent kinetic measuring means capable of measuring the time when the contrast agent has reached the target area on the image and the time when the contrast agent has finished flowing out, and the results of the contrast agent kinetic measuring means X based on
X-ray exposure start time, X-ray exposure end time, contrast agent injection amount,
An operation means for obtaining an injection start time, an injection end time, and an injection speed by a predetermined arithmetic processing, and an operation control means for controlling a photographing timing and an injector operation based on a calculation result by the arithmetic means, X to do
The solution is a line diagnostic device.

In this way, it is possible to set a region of interest on an image, detect a change in pixel density in the region of interest, and switch from fluoroscopy to photography when the density exceeds a certain value.

Further, it is possible to provide a selection control means capable of starting rotation DSA photography manually or under predetermined operating conditions.

Further, in conjunction with the injector, it is possible to set the time to start the injection of the contrast medium of the injector and the timing to start the fluoroscopy.

Also, in order to prevent the contrast medium from disappearing from the target blood vessel area during the rotation DSA imaging, the apparatus has a function of determining the amount of the contrast medium and the injection speed using an image obtained by injecting the contrast medium in advance. Can be made.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show functional block diagrams according to an embodiment of the present invention.

Referring to the functional block diagrams shown in FIGS. 1 and 2, first, an ROI is specified on an image. The designation method is, for example, a pointing device 2 such as a mouse.
Can be specified by enclosing the area to be specified on the image display unit 3 with a circle or a polygon. The designated area may be a point, but it takes a certain time (1, 2 seconds) for the X-ray system to switch from the fluoroscopic X-ray condition to the imaging X-ray condition. It is more preferable to specify the region having the information.

The ROI is displayed on the display unit 18 until the entire rotation DSA imaging sequence is completed, but is not recorded as image data actually collected by the image data collection unit 19. At the same time, as the conditions of the rotational DSA imaging, for example, the voltage and current values, the arm rotation start position / end position, the injection conditions of the contrast agent, that is, the injection amount, the injection speed, and the like are transmitted to the fluoroscopic imaging sequence and the system control unit 1. Input from the input section.

Through the system control unit 1, a tube control unit 4, a GAIN control unit, a ROI setting / pixel value control unit 6,
The arm control unit 7, the injector control unit 8, the aperture control unit 9, and the imaging instruction display control unit are controlled. In addition, the system control unit 1 has the information from each control unit fed back, and can further control each control unit.

When the start of the DSA photographing sequence is instructed from the photographing SW to the system control unit 1 at the time when the above preparations are completed, the aperture control unit 9 automatically operates up to the position where the ROI is first designated. Then, the area is narrowed by the X-ray aperture 12 so that X-rays are radiated only to a portion required for imaging. Here, the X-ray aperture 12 is applied only in the direction perpendicular to the arm rotation axis. This is because if the direction parallel to the rotation axis is narrowed, a portion where information is interrupted depending on the shooting angle occurs. Then, from the system control unit 1 to each control unit,
A signal for performing the mask image photographing is output, and the mask image photographing is performed.

When the arm 13 moves to the set angle, a signal is sent to the system control unit 1, and the system control unit 1 sends a signal to each control unit to inform the end of mask image shooting, and the mask image shooting ends. . At the same time, the arm 13 returns to the rotation start position. At the time of returning to the rotation start position, the arm control unit 7 sends a signal to the system control unit 1 to notify that it has returned to the rotation start position, and the system control unit 1 sends a signal to each control unit for performing a see-through operation. Then, fluoroscopy is started. At this time, an injection start signal is transmitted to the injector control unit 8 to start injection of the contrast agent from the injector 14.

The data detector 20 from the detector 15
The system control unit 1 also automatically changes the gain detected via the control unit in accordance with the fluoroscopy conditions, and feeds it back to the gain control unit 5. At this time, the rotation of the arm and the photographing have not yet started. Here, as shown in FIG. 3, the X-ray system monitors the pixel density of the designated ROI by the ROI setting / pixel value control unit 6. At this time, the change in density of a specific pixel in the ROI may be viewed, or the average density of an arbitrary number of pixels in the ROI may be viewed.

When the injection of the contrast agent is started, R on the fluoroscopic image is
The ROI setting / concentration value control unit issues a signal to the system control unit 1 to notify the system control unit 1 that the specified value has been reached from the point in time when the concentration in the ROI has reached a predetermined value or more after reaching the OI setting position. The control unit 1 switches from the fluoroscopic X-ray condition to the imaging X-ray condition. At this time, the system control unit 1 sends a signal to the gain control unit 5 so that the detection gain on the detector 15 side is also switched for photographing. When all the conditions are completely switched, the system control unit 1 sends a signal to each control unit so as to automatically start photographing a contrast image (arm rotation / photographing). When the arm 13 reaches the rotation end angle, the arm control unit 7 sends a signal to the system control unit 1 to notify that the rotation has ended, and the system control unit 1 sends a contrast image to each control unit. Signals that shooting has been completed.

Here, in order to stop the injection of the contrast agent into the injector 14 at the same time as or immediately before the end of the contrast image shooting, the system control unit 1 sends a signal to the injector control unit 8 by making a signal. Is also good.
In response to a signal from the system control unit 1, the detector 15 turns off the detection gain at the same time that the gain control unit 5 finishes capturing the contrast image.

In fluoroscopy, when the pixel density in the ROI range becomes equal to or higher than a predetermined value, the ROI setting / density value control unit can take a picture via the system control unit 1 to the photographing instruction display control unit. By issuing a signal indicating that there is, a message for automatically starting the contrast image shooting is displayed on the image display unit or any other place, and the operator can manually start the contrast image shooting using the shooting SW 11. You may do it.

FIGS. 4 and 5 show one example of the manual photographing switch 11 capable of photographing manually.

The manual photographing switch 11 shown in FIGS. 4 and 5 and used by the operator in FIG. 2 is configured to be switched in three stages. The first stage is a ReadySW for starting the anode rotation of the X-ray tube 16 in FIG. 2, the second stage is a SW for starting the mask image shooting, and the third stage is a SW for starting the contrast image shooting. When taking a mask image,
By pressing both the first stage and the second stage, imaging starts, mask image imaging ends, and X-ray exposure is interrupted. Thereafter, when the arm 13 completes the movement to the contrast image capturing start position, X-ray fluoroscopy is automatically started. The detection gain of the detector 15 is automatically switched. At this time, the operator waits while pressing the first and second steps, and when the shooting start message is displayed, pressing the third-stage SW starts the contrast image shooting. Is also good. The detection gain of the simultaneous detector 15 is also automatically switched for photographing.
Further, only the contrast image shooting start button may be provided at another position.

Further, a lock unit for preventing mechanical mistakes in pressing the contrast image photographing start button is provided, and when the density value in the ROI reaches a certain value, the system control unit 11 sends an unlock signal to the photographing SW 11 to lock it. , The contrast image capturing start button may be pressed for the first time. FIGS. 4 and 5 show an example of the hand switch, but may be installed on another operation panel of the control system provided in the X-ray diagnostic apparatus according to the present invention.

Further, the contrast image photographing SW 11 is set to Re.
It may be provided in a different place from the dy / mask image photographing SW 11. While the Ready SW and the mask image shooting SW 11 are simultaneously pressed, the contrast image shooting SW 11 is pressed. Further, a mechanism may be provided in which a contrast SW lock SW is provided at a separate location and the third stage SW in FIG. 4 cannot be pressed unless it is pressed. For example, a contrast SW lock S as shown in FIG.
This can be realized by providing W.

The system control unit 11 has both a method of automatically instructing the start of the contrast image photographing and a method of manually instructing the photographing of the contrast image by the operator. The shooting may be started at the time of occurrence, or may be started at the time of two shooting start instructions.

Next, an example in which the system automatically determines rotational start DSA imaging by determining the imaging start and end timing, the injector contrast agent injection start and end timing, and the optimal amount of the contrast agent using previously captured image information. State.

First, a contrast radiography is performed to confirm the blood vessel running in a region where data is to be collected (pre-radiography). At this time, the time when the injector 14 starts injecting the contrast medium and the time change of the injected contrast medium amount are recorded by the contrast medium amount / time measuring unit 21. The flow rate and amount of the contrast agent may be arbitrary, but the contrast is performed so that the entire blood vessel region is contrasted.

Next, using the contrasted image, the whole blood vessel for the purpose of acquiring the rotation DSA data for three-dimensional reconstruction is obtained.
The point at which the contrast agent is injected first (upstream) and the point at which the contrast agent reaches the end (downstream) are specified on the image using the pointing device 2.

The time when the injector 14 starts to inject the contrast agent is T1, the time when the contrast agent appears in the image is T2, and the time when the contrast agent reaches the most downstream point is T3. here,
The total inflow amount of the contrast agent at each time of the injector 14 is V2 at the time T2, and V3 at the time T3. Further, when photographing a contrast image, the arm 13 is used.
The rotation speed of Sdeg. / Sec, and the rotation angle required for the three-dimensional reconstruction rotated DSA image is Dde.
g. And

Referring now to FIG. FIG. 7 is a diagram for explaining the relationship between the target blood vessel, which is the ROI, and the arrival time from T2 to T3 due to the injection of the contrast agent. Also,
The system calculates the contrast image capture start timing, required contrast agent amount, and capture end timing, and the system automatically sets DS
FIG. 8 shows a flow for controlling the A imaging sequence.

Referring to FIGS. 7 and 8, first, T1, T2, T3, V2 and V3 can be obtained from the pre-photographing. The measurement is performed by the contrast agent amount / time measuring unit 21. Also, S and D are uniquely determined from the imaging protocol. From these conditions, the optimal amount of the contrast agent for filling the blood vessel region with the contrast agent in all the angle data at the time of the start (end of imaging), the end timing, and the imaging is calculated.

(1) Start timing of X-ray imaging It is a time when the injector 14 is turned on and the time T3 has elapsed, but it actually takes about one second until the X-ray condition is switched from the fluoroscopic condition to the imaging condition. Therefore, T3-1 (sec)
To enter the shooting mode. At this time, not only the tube conditions but also the detection gain of the detector 15 are simultaneously switched for photographing.

(2) Optimal amount of contrast agent Rotation speed of arm 13: S (deg / sec) Contrast (mask) image shooting angle: D (deg) Time required for shooting: D / S (sec) Injector 14 The total amount of the contrast agent when T2 elapses from the time when is turned on: V2. The total amount of the contrast agent when T2 elapses after the injector 14 turns on: V3. This time is T = D / S (sec).

Further, during the D / S time, the total amount V of the contrast agent for constantly filling the target blood vessel with the contrast agent is as follows: V = V3 + [β × (T + α)] V3: Until the start of imaging Of contrast agent required for the measurement β = (V3-V2) / (T3-T2): amount of contrast agent per unit time flowing between the most upstream point and the most downstream point (vo)
lume / sec) T = D / S (sec), α: arbitrary increase time. Time that can be set in advance by the operator for safety.

Here, α is a constant value that can be set in advance in the system based on the experience of the operator. In addition, the inflow speed of the contrast agent is set to the same condition as in the pre-imaging.

(3) Photographing end timing Arm 13
The point in time when the rotation of is completed is regarded as the end.

With the above method, the system controller 11 calculates the contrast image capturing start timing, the required amount of the contrast agent, and the contrast image capturing end timing.
The detector 15 / arm 13) is fed back to the control unit to automatically control the rotation DSA sequence.

Next, FIG. 6 is a functional block diagram for explaining a functional processing flow according to the embodiment of the present invention.

First, pre-photographing is performed to determine photographing conditions and contrast agent conditions. Imaging is performed from one direction while injecting a contrast agent at an arbitrary injection speed. The captured image is recorded in the image data collection unit. Then, the ROI is designated on the image using the photographed image. The designation method can be designated by surrounding the area to be designated with a circle or a polygon on the image display unit 3 using the pointing device 2 such as a mouse.

The designated area may be a point, but since the X-ray system has a certain time (1, 2 seconds) to switch from the fluoroscopic X-ray condition to the radiographic X-ray condition, the specified region including the target part is It is better to specify a region having an area of. Two points, the ROI of the point where the contrast agent of the target blood vessel is injected first (the most upstream point) and the ROI of the point where the contrast agent reaches the end (the most downstream point) on the image, are designated. R of both
The OI is displayed on the monitor until the entire rotation DSA imaging sequence is completed, but is configured not to be recorded as actually collected image data. When the specification of the ROI is completed, the captured image is reproduced again. At this time, the system control unit 11 exchanges information of time and density value with the ROI setting / density value control and the contrast agent amount / time measuring unit 21 to perform the above-described calculation.

At the time when the calculation is completed, the calculation result can be displayed at an arbitrary position on the image display unit 3. At the time when the calculation is completed, the operator sets conditions for the rotational DSA imaging, such as a voltage and a current value, an arm rotation start position / end position,
The injection condition of the contrast agent, that is, the injection amount, the injection speed, and the like are input from the information input unit to the fluoroscopic imaging sequence and the system control unit 11 (hereinafter, system control unit 11). Through the system control unit 11, a tube control unit 4, a GAIN control unit, an ROI setting / pixel value control unit 6, an arm control unit 7, an injector control unit 8, an aperture control unit 9, and a shooting instruction display control unit are controlled. Information from each control unit is fed back to the system control unit 11, and control for each control unit can be performed based on the fed back information.

At the time when the above preparations are completed, a start instruction of the DSA photographing sequence is issued from the photographing SW 11 to the system control unit 11. First, the aperture control unit 9 automatically reaches the position where the ROI is designated. X-ray aperture 12
The area is narrowed down so that X-rays are emitted only to the points necessary for imaging. Here, the X-ray aperture 12 is applied only in the direction perpendicular to the arm rotation axis. This is because if the direction parallel to the rotation axis is narrowed, a portion where information is interrupted depending on the shooting angle occurs.

Then, a signal for executing the mask image photographing is output from the system control unit 11 to each control unit, and the mask image photographing is performed. When the arm 13 moves to the set angle, a signal is sent to the system control unit 11,
The system control unit 11 outputs a signal notifying the end of the mask image shooting to each control unit, and the mask image shooting ends. At the same time, the arm 13 returns to the rotation start position. When returning to the rotation start position, the arm control unit 7
The system controller 11 outputs a signal notifying that it has returned to the rotation start position, and the system controller 11 outputs a signal to each controller to execute the fluoroscopy, whereby the fluoroscopy is started.

At this time, at the same time, in accordance with the result calculated earlier, the system controller 11 transmits a signal to start the injection to the injector controller 8 to start the injection of the contrast agent. Further, the detection gain of the detector 15 is also changed by the system controller 1.
1 automatically changes according to the fluoroscopic conditions and feeds back to the gain control unit 5. At this time, the rotation of the arm and the photographing have not been started yet. X-ray system is designated R
The pixel density of the OI is monitored by the ROI setting / pixel value control unit 6. At this time, a change in density of a specific pixel in the ROI may be detected, or an average density of an arbitrary number of pixels in the ROI may be detected.

When the injection of the contrast medium is started and the timing of X-ray exposure comes based on the result calculated earlier, the system control unit 11 switches from the fluoroscopic X-ray condition to the imaging X-ray condition. At this time, the system control unit 11 outputs a signal to the gain control unit 5 so that the detection gain on the detector 15 side is also switched for photographing. The signal for switching between the X-ray generation and the gain of the detector 15 may be output, for example, earlier by about one second when the switching of the X-ray condition takes time. Then, when each condition is completely switched, the system control unit 11 automatically starts capturing a contrast image, that is, starts the arm rotation operation and the imaging operation.
A signal is issued to each control unit. Thus, contrast image photographing is started.

When the arm 13 reaches the rotation end angle, the arm control section 7 outputs a signal to the system control section 11 to notify that the rotation has been completed. Based on this signal, the system control unit 11 sends a signal to each control unit to inform that the contrast image capturing has been completed.
Here, the system control unit 11 may output a signal to the injector control unit 8 so as to stop the injection of the contrast agent into the injector 14 at the same time as or immediately before the end of the contrast image shooting. In response to a signal output from the system control unit 11, the detector 15 turns off the detection gain at the same time that the gain control unit 5 finishes capturing the contrast image.

It is assumed that a constant value or a threshold value for determining a change in the density value in the ROI, a change amount of the density value in the ROI per unit time, and the like can be arbitrarily changed.

The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

[0064]

According to the X-ray diagnostic apparatus according to the present invention described above, the optimum X-ray exposure timing, contrast agent injection start time, and contrast enhancement are used during rotational DSA imaging for obtaining three-dimensional reconstruction data. It is possible to obtain the injection amount of the agent and the injection speed of the contrast agent, to reduce the exposure by X-ray irradiation and to reduce the degree of invasion of the object by the contrast agent, and to observe in all frames of the rotational DSA data. Provided is an X-ray diagnostic apparatus capable of obtaining data in which a contrast agent is present in a blood vessel and preventing the occurrence of an artifact when three-dimensionally reconstructed, and improving the image quality of a three-dimensionally reconstructed image. can do.

[Brief description of the drawings]

FIG. 1 shows a functional block diagram according to an embodiment of the present invention.

FIG. 2 is a functional block diagram according to the embodiment of the present invention.

FIG. 3 shows an example of an angiographic X-ray image according to the embodiment of the present invention.

FIG. 4 is a manual photographing switch according to the embodiment of the present invention.
An example is shown below.

FIG. 5 is a manual photographing switch according to the embodiment of the present invention.
2 shows another example.

FIG. 6 is a functional block diagram for explaining a functional processing flow according to the embodiment of the present invention.

FIG. 7 is a diagram illustrating a flow of a contrast agent according to the embodiment of the present invention.

FIG. 8 is a schematic diagram illustrating a DSA imaging sequence according to the embodiment of the present invention.

FIG. 9 is a manual photographing switch according to the embodiment of the present invention.
2 shows another example.

FIG. 10 is a diagram for explaining rotational DSA imaging according to a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... System control part 1, 2 ... Information input / pointing device, 3 ... Image display part, 4 ... Tube display part, 5 ... Gain control part, 6 ... ROI setting / pixel value control part, 7 ... Arm control part, 8: injector control unit, 9: diaphragm control unit, 1
2 X-ray diaphragm, 13 arm, 14 injector

Continuation of the front page (72) Inventor Satoru Oishi 1385-1 Shimoishigami, Otawara-shi, Tochigi Prefecture F-term in the Toshiba Nasu factory (reference) 4C093 AA16 AA24 FA19 FA42 FD09 FF21 FF28 FF34 FF42

Claims (11)

[Claims] 1. An X-ray diagnostic apparatus for obtaining blood vessel strike information from image information obtained by irradiating X-rays before and after injection of a contrast agent into a subject, wherein the X-ray irradiation timing is manually adjusted. X-ray irradiation start instruction input means capable of instructing, X-ray irradiation timing control means for performing X-ray irradiation based on preset X-ray irradiation timing information, X-ray irradiation start instruction input An X-ray irradiation method selecting means for selecting start of X-ray irradiation using either one of the means and the X-ray irradiation timing control means. 2. The X-ray irradiation timing control means includes: an ROI designating means capable of designating a predetermined ROI in the fluoroscopic image photographed by injecting a contrast agent in advance; and an ROI designating means designated by the ROI designating means. 2. A photographing start timing determining means for determining a photographing start timing based on a change amount of an image density value of the entire ROI or a change amount of an image density value of an arbitrary point in the ROI. The X-ray diagnostic apparatus according to claim 1. 3. The radiography / photography switching means for switching from radiography to radiography based on a result of detecting a pixel value at an arbitrary point or a density change amount per unit time of the pixel value. The X-ray diagnostic apparatus according to claim 2, further comprising: 4. An X-ray diagnostic apparatus capable of capturing a three-dimensional contrast image of a blood vessel of a subject, wherein a target region in a blood vessel region in which it is desired to obtain filling state information during a contrast agent injection process can be specified on a fluoroscopic image. Region specifying means, density change detecting means for detecting a density change of a pixel value in the entire target area specified by the area specifying means or an arbitrary position in the target area, and a result of the density change detecting means. A photographing operation switching unit for switching from a fluoroscopic operation to a rotational photographing operation based on a result of comparing the state of filling of the contrast agent with a predetermined threshold based on the X-ray diaphragm 12 in advance in conjunction with the photographing operation switching unit; An X-ray diagnostic apparatus, comprising: a narrowing-down means for narrowing down to a predetermined position. 5. The X-ray diagnostic apparatus according to claim 4, wherein the imaging operation switching unit includes a threshold setting unit that can set the threshold value to an arbitrary value. 6. The contrast agent injection control means for stopping the injection operation of the contrast agent at the same time as the end of the rotation imaging operation or at an arbitrary time earlier than the end of the rotation imaging operation. Item 6. The X-ray diagnostic apparatus according to item 4 or 5. 7. The photographing operation switching means includes a detection gain switching means for switching a detection gain on a detector side to a predetermined value simultaneously with a switching operation from a fluoroscopic operation to a rotational imaging operation. Item 7. The X-ray diagnostic apparatus according to any one of Items 4 to 6. 8. An X-ray diagnostic apparatus capable of capturing a three-dimensional contrast image of a blood vessel of a subject, wherein an arm is set at a predetermined position at which contrast image capturing is started after mask image capturing is completed, and fluoroscopic operation and imaging are performed. Fluoroscopic operation start means for injecting an agent; fluoroscopic operation information input means capable of arbitrarily setting the timing of a fluoroscopic operation and a contrast agent injection operation by the fluoroscopic operation start means; and a fluoroscopic operation and imaging by the fluoroscopic operation start means. An operation order setting means for arbitrarily setting an operation start order with an agent injection operation. 9. The perspective operation information input means includes a state display means for displaying, on an image or a display device, a state display indicating that the operation can be shifted from the fluoroscopic operation to the start of photographing. Claim 8
The X-ray diagnostic apparatus according to claim 1. 10. An X-ray diagnostic apparatus capable of capturing a three-dimensional contrast image of a blood vessel of a subject, wherein an operation can be selected only in the order of X-ray exposure preparation, mask image capturing, and contrast image capturing. X-ray irradiation operation means, and operation regulation control means for enabling selection of the contrast image photographing by the X-ray irradiation operation means only when the ROI density value exceeds a predetermined threshold value. X-ray diagnostic apparatus. 11. An X-ray diagnostic apparatus capable of capturing a three-dimensional contrast image of a blood vessel of a subject, wherein a contrast agent injection start time and an image on the basis of a contrast image or a fluoroscopic image of the subject captured in advance. Contrast agent dynamics measuring means capable of measuring the time when the contrast agent arrives at the target area and the time when the contrast agent has finished flowing out; X-ray irradiation start time, X-ray Calculating means for calculating the exposure end time, the injection amount of the contrast agent, the injection start time, the injection end time, and the injection speed in a predetermined calculation process; and controlling the imaging timing and the injector operation based on the calculation results by the calculation means. An X-ray diagnostic apparatus comprising: operation control means.