JP2019162410A - Input device, measurement system, and program - Google Patents

Abstract

An object of the present invention is to make it easy to understand a position to be acquired next with a stylus pen of a digitizer.
In order to determine the positional relationship between the position of a marker attached to a measurement target detectable by a brain function measurement device and the shape of the measurement target, the shape of the measurement target is converted into a signal sent from a stylus pen. And a control unit that generates a screen in which the three-dimensional shape of the measurement target and a guide of a position to be acquired next with the stylus pen are superimposed on the input device, and the screen generated by the control unit is displayed. Display means for displaying on the section.
[Selection] Figure 7

Description

  The present invention relates to an input device, a measurement system, and a program.

  2. Description of the Related Art Conventionally, in a magnetoencephalograph that measures a magnetoencephalogram (MEG), a weak magnetic field generated with brain activity (a brain response to a stimulus) is measured. By superimposing the measured result on the MRI (Magnetic Resonance Imaging) image of the measurement subject, it is possible to know in which part of the brain the activity has occurred. Furthermore, it is possible to know the brain activity in more detail by superimposing the current generation position estimated based on the magnetic field instead of the measured magnetic field on the MRI image.

  Here, the coordinate system of the MRI image is different from the coordinate system of the MEG. In order to superimpose the measurement result of the magnetoencephalograph on the MRI image, it is necessary to calculate a conversion matrix between the coordinate systems.

In order to calculate this transformation matrix, the coordinates of the three points (Fiducial Point: FP) of the nasal root point and the left and right ears which are reference points are acquired on the MRI apparatus and on the magnetoencephalograph. Each acquisition method is shown below.
-MRI apparatus: The measurer designates the above three points on the image.
Magnetoencephalograph: A marker coil (sensor) is attached to the above three points. During measurement, a magnetic field is generated from the marker coil (sensor), and the position of the marker coil (sensor) is measured by a magnetoencephalograph.
Thereby, since the position of FP can be obtained in each coordinate system, the conversion matrix between coordinate systems can be calculated | required.

  Furthermore, in order to improve accuracy, a technique is disclosed in which the shape of the entire head is obtained, the shape obtained by combining both the head and the magnetoencephalograph at the time of measurement, and the performance is improved by comparing the obtained shapes ( Patent Document 1).

  According to the conventional technology, since most of the head is hidden by the helmet, it is necessary to perform alignment with a 3D image in a very narrow range. In addition, there are many areas where there are concerns about the deformation (moving) of the jaw, etc. in the exposed part, and there is a problem that the positional relationship between the target brain and the sensor cannot be measured correctly. It was.

  Therefore, according to the prior art, a digitizer that acquires the shape of the subject by tracing the head of the target with the tip of the stylus pen is used to correctly determine the positional relationship between the brain of the measurement subject and the sensor. I am trying to measure.

  By the way, when using a pen-type digitizer, it is necessary to collect the coordinates of many points in a balanced manner in order to improve the alignment accuracy. Therefore, according to the conventional technique, by displaying the points and numbers already acquired in the digitizer user interface, a sufficient number of points are secured, and data is acquired in all ranges. So that the user knows. Furthermore, a screen suggesting an area to be traced with a stylus pen is also displayed.

  However, there is a problem that it is difficult to understand the relationship between the point actually plotted with the stylus pen of the digitizer and the area to be traced with the stylus pen, and the area to be traced next is difficult to understand.

  The present invention has been made in view of the above, and an object of the present invention is to make it easy to understand the position to be acquired next with a stylus pen of a digitizer.

  In order to solve the above-described problems and achieve the object, the present invention determines the positional relationship between the position of the marker attached to the measurement target detectable by the brain function measurement device and the shape of the measurement target. In the input device for inputting the shape of the measurement object in accordance with a signal sent from the stylus pen, a screen is generated by superimposing the three-dimensional shape of the measurement object and a guide of a position to be acquired next by the stylus pen. Control means and display means for displaying the screen generated by the control means on a display unit.

  According to the present invention, it is possible to easily understand the position to be acquired next with the stylus pen of the digitizer.

FIG. 1 is a schematic diagram of a biological signal measurement system according to an embodiment. FIG. 2 is a diagram illustrating a head of a measurement subject that is a measurement target. FIG. 3 is a block diagram showing a hardware configuration of the three-dimensional digitizer. FIG. 4 is a functional block diagram showing functions of the three-dimensional digitizer. FIG. 5 is a diagram illustrating an example of designation of three FPs on the screen. FIG. 6 is a flowchart showing the flow of the three FP designation processing. FIG. 7 is a diagram illustrating an example of a UI image displayed on the display unit of the three-dimensional digitizer. FIG. 8 is a diagram illustrating an example of a UI image displayed on a display unit of a conventional three-dimensional digitizer. FIG. 9 is a flowchart schematically showing the flow of UI image display processing. FIG. 10 is a diagram showing a user interface for designating three FPs in the MRI image. FIG. 11 is a modification of the flowchart schematically showing the flow of UI image display processing. FIG. 12 is a modified example of a flowchart schematically showing the flow of UI image display processing. FIG. 13 is a diagram showing a modification of the screen. FIG. 14 is a diagram illustrating another modification of the screen.

  Exemplary embodiments of an input device, a measurement system, and a program will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram of a biological signal measurement system 1 according to an embodiment. The biological signal measuring system 1 measures and displays a plurality of types of biological signals, for example, a magnetoencephalography (MEG) signal and an electroencephalography (EEG) signal.

  As shown in FIG. 1, a biological signal measurement system 1 that is a measurement system includes a measurement device 3, a measurement table 4, a data recording server 42, and an information processing device 50. The information processing apparatus 50 includes a monitor display 51 that displays signal information obtained by measurement and analysis results. In the present embodiment, the data recording server 42 and the information processing apparatus 50 are provided separately, but at least a part of the data recording server 42 may be incorporated in the information processing apparatus 50.

  The measuring device 3 is a brain function measuring device and is a magnetoencephalograph that measures a magnetoencephalogram signal and an electroencephalogram signal. A subject to be measured lies on his / her back on the measurement table 4 with an electroencephalogram measurement electrode (or sensor) attached to his / her head, and puts his / her head in the depression 31 of the dewar 30 of the measurement apparatus 3. The dewar 30 is a cryogenic environment holding container using liquid helium, and a large number of magnetic sensors for magnetoencephalogram measurement are arranged inside the recess 31 of the dewar 30. The measuring device 3 collects an electroencephalogram signal from the electrode and a magnetoencephalogram signal from the magnetic sensor. The measuring device 3 outputs the collected biological signal to the data recording server 42.

  In general, the dewar 30 incorporating the magnetic sensor and the measurement table 4 are disposed in the magnetic shield room, but the magnetic shield room is omitted for convenience of illustration.

  The data recording server 42 records data such as a biological signal output from the measuring device 3.

  The information processing apparatus 50 reads out the data recorded in the data recording server 42, displays it on the monitor display 51, and analyzes it. The information processing apparatus 50 displays the waveforms of the magnetoencephalogram signals from the plurality of magnetic sensors and the waveforms of the electroencephalogram signals from the plurality of electrodes in synchronization on the same time axis. The electroencephalogram signal represents the electrical activity of nerve cells (the flow of ionic charges that occurs in the dendrites of neurons during synaptic transmission) as a voltage value between the electrodes. The magnetoencephalogram signal represents a minute magnetic field fluctuation caused by the electrical activity of the brain. The brain magnetic field is detected by a highly sensitive superconducting quantum interferometer (SQUID) sensor.

  In addition, the biological signal measurement system 1 includes a biological image measurement device 11 and a biological image recording server 10 to which the biological image measurement device 11 is connected. The biological image recording server 10 is connected to the information processing apparatus 50. The biological image measurement apparatus 11 is an MRI apparatus that captures an MRI (Magnetic Resonance Imaging) image of a measurement subject as a measurement target. The biological image recording server 10 stores the MRI image captured by the biological image measurement device 11.

  Here, FIG. 2 is a diagram showing the head of the person to be measured who is the measurement object. As shown in FIG. 2, marker coils M1, M2, M3, M4, and M5, which are FPs (Fiducial Points), are attached to the head of the measurement subject that is the measurement target. More specifically, the marker coil M1 is affixed to the nose root point, the marker coils M2 and M3 are affixed to the left and right ears, respectively, and the marker coils M4 and M5 are affixed to the left and right of the forehead with the nose root point in between. Attached.

  The measuring device 3 measures the position of the marker coil based on the magnetic field generated from the marker coil during measurement. On the other hand, in the biological image measurement device 11, the measurer specifies FP on the image. Thereby, since the position of FP can be obtained in each coordinate system, the conversion matrix between coordinate systems can be calculated | required.

  In addition, the biological signal measurement system 1 includes a three-dimensional digitizer 20 that is an input device. The three-dimensional digitizer 20 is connected to the information processing apparatus 50. The biological signal measurement system 1 uses the three-dimensional digitizer 20 to correctly measure the positional relationship between the measurement subject's brain and the sensor. The three-dimensional digitizer 20 measures the shape of the measurement subject's head and the positions where the marker coils M1, M2, M3, M4, and M5 for detecting the head position in the measurement apparatus 3 are attached.

  Next, the three-dimensional digitizer 20 will be described.

  Here, FIG. 3 is a block diagram showing a hardware configuration of the three-dimensional digitizer 20. As shown in FIG. 3, the three-dimensional digitizer 20 includes a CPU (Central Processing Unit) 25 that controls the entire three-dimensional digitizer 20. A detection circuit 22 that detects the position of the stylus pen 24, a memory 21, a communication interface 23, and a display unit 26 that is a liquid crystal display (LCD) are connected to the CPU 25 built in the three-dimensional digitizer 20. Here, the stylus pen 24 is a pen that emits an electromagnetic field or detects an electromagnetic field. When the stylus pen 24 senses that the head of the person to be measured, which is a measurement object, is touched, the detection circuit 22 detects the coordinates of the tip position of the stylus pen. Is done. The coordinates may be acquired at a timing when a coordinate acquisition button (built in the stylus pen 24 or installed outside by wireless connection) is pressed, or may be acquired continuously for a certain time.

  The memory 21 is composed of, for example, a large-capacity flash memory or a hard disk, and is stored in a state where the coordinates of the writing position can be rewritten. On the other hand, the communication interface 23 includes a USB port or the like.

  The memory 21 stores various control programs. For example, the CPU 25 executes various control programs stored in the memory 21 and outputs control commands for controlling various operations in the three-dimensional digitizer 20.

  The control program executed by the CPU 25 of the three-dimensional digitizer 20 of the present embodiment is a file in an installable format or an executable format, and is a CD-ROM, flexible disk (FD), CD-R, DVD (Digital Versatile Disk). For example, the program may be recorded on a computer-readable recording medium.

  Furthermore, the control program executed by the CPU 25 of the three-dimensional digitizer 20 of the present embodiment may be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. . Further, the control program executed by the CPU 25 of the three-dimensional digitizer 20 of the present embodiment may be provided or distributed via a network such as the Internet.

  Next, functions of the three-dimensional digitizer 20 that are exhibited when the CPU 25 executes various control programs stored in the memory 21 will be described. Here, description of conventionally known functions will be omitted, and characteristic functions exhibited by the three-dimensional digitizer 20 of the present embodiment will be described in detail.

  Here, FIG. 4 is a functional block diagram showing functions of the three-dimensional digitizer 20. As shown in FIG. 4, the three-dimensional digitizer 20 includes a head model DB 201, a head model creation / selection unit 202 that is a model acquisition unit, a digitizer coordinate acquisition unit 203, and a display / operation unit 204 that is a display unit. And a control unit 205 which is a control means, and an MRI image acquisition unit 206.

  The control unit 205 receives signals from the respective units (head model creation / selection unit 202, digitizer coordinate acquisition unit 203, display / operation unit 204, and MRI image acquisition unit 206), and transmits appropriate commands.

  The digitizer coordinate acquisition unit 203 acquires the position coordinates of the pen tip of the stylus pen 24.

  The display / operation unit 204 acquires a user operation via a mouse or the like and sends the operation to the control unit 205, and performs display corresponding to the command from the control unit 205 on the display unit 26.

  The MRI image acquisition unit 206 acquires an MRI image of the measurement subject captured by the biological image measurement device 11 from the biological image recording server 10 via the information processing device 50 according to a command from the control unit 205.

  The head model DB 201 stores a 3D model of the head shape. The head-shaped 3D model may be an actually acquired image or an artificially generated 3D model. As a simplest aspect, a model in which a protrusion showing a nose or an ear is provided on a sphere may be used. In the present embodiment, three FPs (nasal root marker coil M1, left and right ear marker coils M2, M3: Nasion, Left Ear, Right Ear) are set on the 3D model of the head shape. Remember me.

  The head model creation / selection unit 202 executes one of the following processes.

  First, the head model creation / selection unit 202 selects a 3D model having a head shape in which the three FPs are closest to each other from the 3D models having the head shape stored in the head model DB 201.

  More specifically, the head model DB 201 stores 3D models of many head shapes with different races and ages. When the head model creation / selection unit 202 receives that three FPs are designated by the stylus pen 24 via the digitizer coordinate acquisition unit 203, the head model creation / selection unit 202 stores the 3D model of the head shape stored in the head model DB 201. The model having the closest arrangement of the three FPs is selected from among them, and is displayed on the display unit 26 via the display / operation unit 204.

  Here, the designation of the three FPs will be briefly described. FIG. 5 is a diagram showing an example of designation of three FPs on the screen D1, and FIG. 6 is a flowchart showing a flow of designation processing of three FPs. When the three-dimensional digitizer 20 is activated and the first FP designated by the stylus pen 24 is received, the head model creation / selection unit 202 reflects and displays the first point on the screen D1 (step S1). S11). Similarly, when the second FP designated by the stylus pen 24 is received, the head model creation / selection unit 202 reflects and displays the second point on the screen D1 (step S12). When the third FP designated by the stylus pen 24 is received, the head model creation / selection unit 202 reflects and displays the third point on the screen D1 (step S13). As described above, three FPs are determined.

  Note that the 3D model of the head shape is not necessarily artificial, and a large amount of MRI images are stored in the head model DB 201 and a similar one to the person being measured is selected from the three FPs. Also good. However, in that case, it is preferable to make it clear on the screen that the 3D model of the selected head shape is not that of the person to be measured.

  Second, the head model creation / selection unit 202 has the same arrangement of the three FPs as the three FPs designated by the stylus pen 24 for the 3D model of the head shape stored in the head model DB 201. It deforms as follows.

  More specifically, the head model DB 201 stores one head-shaped 3D model. When the head model creation / selection unit 202 receives that the three FPs are designated by the stylus pen 24 via the digitizer coordinate acquisition unit 203, the head model creation / selection unit 202 matches the coordinates of the three FPs designated by the stylus pen 24. As described above, the 3D model of the head shape stored in the head model DB 201 is deformed and displayed on the display unit 26 via the display / operation unit 204.

  7 shows an example of a UI (User Interface) image displayed on the display unit 26 of the three-dimensional digitizer 20, and FIG. 8 shows an example of a UI image displayed on the display unit of the conventional three-dimensional digitizer. FIG. As shown in FIG. 7, the control unit 205 of the three-dimensional digitizer 20 uses the stylus pen 24 to trace the area (guide for the position to be acquired next) A1 and the head selected by the head model creation / selection unit 202. The 3D model MD having a shape is superimposed and displayed. In this manner, the area A1 to be traced and the 3D model MD having the head shape are displayed in a superimposed manner with the stylus pen 24 as compared with the UI image displayed on the display unit of the conventional three-dimensional digitizer shown in FIG. The relationship between the points actually plotted with the stylus pen 24 of the three-dimensional digitizer 20 and the area to be traced with the stylus pen 24 is easy to understand. As a result, the user can intuitively know what data is to be acquired with the stylus pen 24 of the three-dimensional digitizer 20 next.

  In addition, the code | symbol a shown in FIG. 7 is a plane image of a head shape model. By displaying the planar image a of the head-shaped model in this way, it is possible to make it easy to visually recognize the area A1 in the depth direction that is difficult to understand with the head-shaped 3D model MD.

  The generation of the area A1 to be traced with the stylus pen 24 (the guide for the position to be acquired next) A1 is well known and will not be described.

  As described above, the head shape varies depending on the race and age, and has various shapes. Therefore, when a single head-shaped model is simply displayed, the display of the actually acquired point and the guide of the point to be acquired next are displayed with a large deviation, which may cause misunderstanding.

  Therefore, in the three-dimensional digitizer 20 of the present embodiment, a head-shaped 3D model MD suitable for the measurement subject is prepared by one of the above-described two methods, and a stylus pen 24 is used in the UI image. The area A1 to be traced is superimposed and displayed.

  Next, UI image display processing in the three-dimensional digitizer 20 will be described.

  FIG. 9 is a flowchart schematically showing the flow of UI image display processing.

  As shown in FIG. 9, when it is received that three FPs (Nasion, Left Ear, and Right Ear) are designated by the stylus pen 24 via the digitizer coordinate acquisition unit 203 (Yes in step S1), the control unit 205 Makes an inquiry to the MRI image acquisition unit 206 in order to acquire the MRI image of the measurement subject imaged by the biological image measurement device 11 (step S2).

  Note that “FP” is designated by the stylus pen 24 means that the FP is touched with the pen tip and a certain switch is pressed to acquire coordinates. Examples of the switch include a switch whose tip is a switch and a switch that is pressed by a hand other than the hand holding the stylus pen 24.

  Here, there are cases where an MRI image cannot be acquired, for example, when MEG measurement by the measuring device 3 that is a magnetoencephalograph is preceded. When the MRI image can be acquired (Yes in Step S3), the control unit 205 proceeds to Step S6. When the MRI image cannot be acquired (No in Step S3), the control unit 205 proceeds to Step S4.

  In step S <b> 6, the control unit 205 confirms whether the coordinates of three FPs (Nasion, Left Ear, and Right Ear) have already been specified in the acquired MRI image (3D image) of the measurement subject. The coordinates of the three FPs (Nasion, Left Ear, and Right Ear) may be included in the header of the MRI image or in a separate file from the MRI image.

  When the coordinates of three FPs (Nasion, Left Ear, and Right Ear) have already been specified in the MRI image of the measurement subject (Yes in step S6), the control unit 205 proceeds to step S7 and proceeds to step S7. When the coordinates of three FPs (Nasion, Left Ear, and Right Ear) are not specified in the image (No in step S6), the process proceeds to step S8.

  In step S7, the control unit 205 enlarges / reduces / rotates / transforms the MRI image acquired from the MRI image acquisition unit 206 so that the three points of FP (Nasion, Left Ear, and Right Ear) match, A region A1 to be traced is displayed on the display unit 26 by the stylus pen 24 via the display / operation unit 204.

  In step S8, the control unit 205 causes the display unit 26 to display the MRI image acquired from the MRI image acquisition unit 206 on the display unit 26 via the display / operation unit 204, and allows the user to display three FPs (Nasion, Left Ear). , Right Ear). Here, FIG. 10 is a diagram showing a user interface for designating three FPs in the MRI image D2.

  When the three FPs (Nasion, Left Ear, and Right Ear) are designated (for example, when Nasion is designated), the control unit 205 positions the MRI image acquired from the MRI image acquisition unit 206 at these three points. And the region A1 to be traced with the stylus pen 24 is superimposed on the display / operation unit 204 and displayed on the display unit 26 (step S9).

  On the other hand, in step S <b> 4, the head model creation / selection unit 202 obtains a 3D model having a head shape corresponding to three FPs (Nasion, Left Ear, Right Ear) designated by the stylus pen 24 from the head model DB 201. The head-shaped 3D model is deformed in accordance with the selection or three FPs (Nasion, Left Ear, and Right Ear) designated by the stylus pen 24.

  Thereafter, the control unit 205 includes three FPs (Nasion, Left Ear, Right Ear) of the 3D model MD of the selected or deformed head shape and three FPs (Nasion, Left Ear, Right Ear) currently designated. And the region A1 to be traced with the stylus pen 24 is superimposed on the 3D model MD and displayed on the display unit 26 via the display / operation unit 204 (step S5).

  In the flowchart shown in FIG. 9, the coordinates are designated (step S8), but the present invention is not limited to this. Here, FIG. 11 is a modification of the flowchart schematically showing the flow of the UI image display processing.

  As shown in FIG. 11, when the coordinates of three FPs (Nasion, Left Ear, and Right Ear) are not designated in the MRI image of the measurement subject (No in step S6), the process proceeds to step S4 to create a head model. The selection unit 202 selects a head-shaped 3D model that matches three FPs (Nasion, Left Ear, and Right Ear) specified by the stylus pen 24 from the head model DB 201 or is specified by the stylus pen 24. The head-shaped 3D model is deformed according to three FPs (Nasion, Left Ear, and Right Ear).

  Thereby, even if there is an MRI image of the person to be measured, if there is no designation on the MRI image, the advantage is that it is not possible to take the trouble of the measurer by using the head model instead of the coordinate designation on the MRI image. There is.

  In the flowchart shown in FIG. 9, the presence / absence of the MRI image is confirmed. However, the present invention is not limited to this, and the head model may be used without confirming the presence / absence of the MRI image. Here, FIG. 12 is a modification of the flowchart schematically showing the flow of the UI image display processing.

  As shown in FIG. 12, when it is received that three FPs (Nasion, Left Ear, Right Ear) are designated by the stylus pen 24 via the digitizer coordinate acquisition unit 203 (Yes in step S1), the process proceeds to step S4. Then, the head model creation / selection unit 202 selects, from the head model DB 201, a head-shaped 3D model that matches three FPs (Nasion, Left Ear, and Right Ear) designated by the stylus pen 24, or a stylus. The head-shaped 3D model is deformed in accordance with three FPs (Nasion, Left Ear, and Right Ear) designated by the pen 24.

  This eliminates the need for confirmation of the MRI image, which has the advantages of simplifying the process and not requiring the operator to save time.

  In addition, when three FPs (Nasion, Left Ear, and Right Ear) are overlaid, it is possible to make the 3D model of the head shape upright using the upper and lower information of the MRI image, or to face the front. is there. Accordingly, it is possible to cope with the case where the vertical, horizontal, and longitudinal directions are uncertain in the initial state depending on the model of the three-dimensional digitizer 20.

  Furthermore, it is preferable to make the following measures so that the area to be traced with the stylus pen 24 can be easily seen on the screen. First, the control unit 205 rotates the coordinate system (the 3D model of the head shape and the points already collected) so that the area to be traced with the stylus pen 24 is in front. Second, the control unit 205 performs 3D display with a viewpoint at the position of the stylus pen 24.

  As described above, according to the present embodiment, when there is an MRI image, the MRI image is formed in an appropriate shape, and the area A1 to be traced is superimposed and displayed, and when there is no MRI image, it is prepared. Since the 3D model MD of the head is properly shaped and the area A1 to be traced is superimposed and the operation of the stylus pen 24 of the three-dimensional digitizer 20 is guided, the MRI image can be acquired without being conscious of it. The MRI coordinate system and the MEG coordinate system can be aligned by an intuitively easy-to-understand operation. Further, it is easy to intuitively understand the point designated by the three-dimensional digitizer 20 and the point to be designated next by the stylus pen 24 of the three-dimensional digitizer 20.

(Modification)
Here, a modification of the embodiment will be described.

  The three-dimensional digitizer 20 of the present embodiment can acquire the position of the stylus pen 24 that traces the head even when the stylus pen 24 is not in contact with the head. Therefore, the control unit 205 may display the position of the tip of the stylus pen 24 on the screen. In order to guide the operation of the stylus pen 24, the control unit 205 may display the position of the tip of the stylus pen 24 on the screen and indicate the direction in which the stylus pen 24 should be moved by an arrow or the like. good.

  Here, FIG. 13 is a diagram showing a modification of the screen. According to the screen example shown in FIG. 13, the position Y of the tip of the stylus pen 24 is displayed, and the direction in which the stylus pen 24 should be moved is indicated by an arrow X. Thereby, the moving direction of the stylus pen 24 to an appropriate position in an area to be traced with the stylus pen 24 can be indicated with respect to the head.

  FIG. 14 is a diagram showing another modification of the screen. According to the screen example shown in FIG. 14, the control unit 205 also displays the locus Z that has already been traced with the stylus pen 24 on the head.

DESCRIPTION OF SYMBOLS 1 Measurement system 3 Brain function measuring apparatus 20 Input apparatus 24 Stylus pen 202 Model acquisition means 205 Control means 204 Display means

Japanese Patent No. 4600735

Claims (12)

In order to determine the positional relationship between the position of the marker attached to the measurement target that can be detected by the brain function measurement device and the shape of the measurement target, the shape of the measurement target is input according to a signal sent from the stylus pen. In the input device,
Control means for generating a screen in which the three-dimensional shape of the measurement object and a guide for a position to be acquired next with the stylus pen are superimposed;
Display means for displaying the screen generated by the control means on a display unit;
An input device comprising: Model acquisition means for acquiring a 3D model of the shape of the measurement object,
The control unit sets the 3D model of the shape of the measurement target acquired from the model acquisition unit as the three-dimensional shape of the measurement target.
The input device according to claim 1. When at least three reference points are specified by the stylus pen, the model acquisition unit deforms the specified at least three reference points so that the positions of the at least three reference points coincide with each other, thereby generating a 3D model of the shape of the measurement target. ,
The input device according to claim 2. When at least three reference points are designated by the stylus pen, the model acquisition unit selects a model having the closest arrangement of the three reference points from a plurality of 3D models of the shape of the measurement target.
The input device according to claim 2. The control means sets the measurement image of the medical image device as the shape of the measurement object.
The input device according to claim 1. The control means rotates the coordinate system so that a guide of a position to be next acquired with the stylus pen is in front.
The input device according to any one of claims 1 to 5, wherein The control means uses the position of the stylus pen as a 3D display viewpoint.
The input device according to any one of claims 1 to 5, wherein The control means displays the position of the tip of the stylus pen along with the screen.
The input device according to claim 1, wherein the input device is an input device. The control means displays a direction in which the stylus pen should move along with the screen.
The input device according to claim 8. The brain function measuring device is a magnetoencephalograph that measures a magnetoencephalogram (MEG).
The input device according to claim 1, wherein the input device is an input device. A brain function measuring device;
In order to determine the positional relationship between the position of the marker attached to the measurement target that can be detected by the brain function measurement device and the shape of the measurement target, the shape of the measurement target is input according to the signal sent from the stylus pen. An input device according to any one of claims 1 to 10,
A measurement system comprising: In order to determine the positional relationship between the position of the marker attached to the measurement target that can be detected by the brain function measurement device and the shape of the measurement target, the shape of the measurement target is input according to a signal sent from the stylus pen. A computer that controls the input device,
Control means for generating a screen in which the three-dimensional shape of the measurement object and a guide for a position to be acquired next with the stylus pen are superimposed;
Display means for displaying the screen generated by the control means on a display unit;
Program to function as.