JP2016106814A - Medical image diagnostic apparatus and imaging range display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a user interface visually and clearly indicating a range that can be imaged in the body axial direction when setting the imaging range in a medical image diagnostic apparatus.SOLUTION: A medical image diagnostic apparatus comprises: a bed device having a top board on which a subject is placed and can move in the body axial direction; and an imaging device which is fixed to a prescribed position with respect to the body axial direction and which images the subject placed on the top board with the prescribed imaging width in the body axial direction, calculates the range that can be imaged in the body axial direction in consideration of the distance to the bed device with which the top board becomes the prescribed speed, the distance with which the top board stops from the prescribed speed, the half value of the imaging width of the imaging device and the like on the basis of the imaging range of the top board by the imaging device when the top board is moved in the movable range in the body axial direction, and displays the calculated range that can be imaged together with a transparent image, a figure simulating the bed device and the like.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a technique for controlling an imaging range of a medical image diagnostic apparatus.

In recent years, various medical image diagnostic apparatuses such as an X-ray CT apparatus, an MRI apparatus, an X-ray diagnostic apparatus, a fluoroscopic imaging apparatus, a SPECT apparatus, and a PET apparatus have been developed as apparatuses for imaging and diagnosing medical images of a subject. .
For example, in an X-ray CT apparatus that captures a tomographic image of a subject using X-rays, the bed is moved up and down in the height direction while the subject is placed on a medical bed apparatus (hereinafter referred to as a bed). It is moved back and forth in the direction and moved left and right in the direction perpendicular to the body axis, and is carried in and out of the X-ray irradiation space of the scanner.

  When making an imaging plan in these medical image diagnostic apparatuses, knowing the movable range of the bed in the vertical direction, the longitudinal movement in the body axis direction, and the left and right movement in the vertical direction of the body axis, This is important to avoid accidents such as device contact, imaging failure of the subject due to out of the movable range, and re-imaging.

  Patent Document 1 displays a range in which the bed can move in the vertical direction in the height direction and the horizontal movement in the vertical direction of the body axis as a safety region with respect to the fluoroscopic image or cross-sectional image of the subject. When an arbitrary position of the image is designated as the diagnostic center position, if the designated diagnostic center position is within the safety region, the medical couch that moves the bed top so that the diagnostic center position becomes the imaging center position A medical image photographing apparatus including the apparatus is disclosed.

JP 2010-187812 A

  However, in Patent Document 1, no consideration is given to the range in which the subject can be imaged in the body axis direction. There is also a movable range in the body axis direction, and this range also changes depending on the shooting conditions. For this reason, depending on the shooting position, it is outside the shooting range, and shooting to a desired position cannot be performed, and shooting may fail.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a medical image diagnosis including a user interface that can visually recognize a range that can be imaged in the body axis direction that conforms to imaging conditions. An object is to provide an apparatus.

  In order to achieve the above-described object, the first invention includes an imaging device for imaging a subject, a couch device for carrying in and out of the imaging space of the imaging device, and a imaging device for imaging the subject. A medical image diagnostic apparatus comprising: a calculating unit that calculates a range in which the top plate can be imaged in accordance with the body axis direction; and a display unit that displays the calculated range that can be captured.

  According to a second aspect of the present invention, there is provided an imaging performed by a medical image diagnostic apparatus comprising: an imaging apparatus that images a subject; and a bed device that carries a top plate on which the subject is placed into and out of an imaging space of the imaging apparatus. An imaging range display method comprising: a calculation step for calculating a range in which the top plate can be imaged according to a condition, and a display step for displaying the calculated range for imaging. .

  According to the present invention, it is possible to provide a medical image diagnostic apparatus provided with a user interface in which a range that can be imaged in the body axis direction suitable for imaging conditions is visible.

Overall configuration diagram of X-ray CT apparatus 1 The flowchart which shows the flow of the imaging | photography range control process in 1st Embodiment. The figure which shows the movable range of the top plate 202, and the imaging | photography range of the top plate 202 The figure which shows the irradiation range 8 of X-rays The figure which shows the range 11 and the limit position 12 which can be image | photographed of the top plate 202 The figure which shows the example of the setting screen 41 of the imaging | photography range in 1st Embodiment. The flowchart which shows the flow of the imaging | photography range control process in 2nd Embodiment. The figure which shows the example of the setting screen 42 of the imaging | photography range in 2nd Embodiment. The flowchart which shows the flow of the imaging | photography range control process in 3rd Embodiment. The figure which shows the example of the setting screen 43 of the imaging | photography range in 3rd Embodiment.

Hereinafter, an X-ray CT apparatus 1 will be described as a preferred embodiment using a medical image diagnostic apparatus according to the present invention with reference to the accompanying drawings.
In the embodiment of the present invention, the X-ray CT apparatus 1 will be described. However, the medical image diagnostic apparatus according to the present invention includes various devices such as an MRI apparatus, an X-ray diagnostic apparatus, a fluoroscopic apparatus, a SPECT apparatus, and a PET apparatus. It is applied to a medical image diagnostic apparatus.

  FIG. 1 is an overall configuration diagram of an X-ray CT apparatus 1 to which the present invention is applied. As shown in FIG. 1, the X-ray CT apparatus 1 includes a scan gantry unit 100, a bed 200, and a console 300.

  The scan gantry unit 100 includes an X-ray source 101, an X-ray control device 102, a collimator 103, a collimator control device 104, a turntable 105, an X-ray detector 106, a data collection device 107, a gantry control device 108, and the like.

  The X-ray source 101 is controlled by the X-ray control device 102 to irradiate the subject placed on the top plate 202 of the bed 200 continuously or intermittently. The X-ray controller 102 controls the X-ray tube voltage and the X-ray tube current applied or supplied to the X-ray source 101 according to the X-ray tube voltage and the X-ray tube current determined by the system controller 303 of the console 300. To do.

  The collimator 103 irradiates the subject with X-rays emitted from the X-ray source 101 as X-rays such as a cone beam (conical or pyramidal beam), for example, and the aperture width is controlled by the collimator control device 104. Is done. X-rays transmitted through the subject enter the X-ray detector 106.

  The turntable 105 includes an opening for receiving a subject placed on the top plate 202, and an X-ray source 101, a collimator 103, an X-ray detector 106, a data collection device 107, and the like are mounted thereon. The turntable 105 is rotated by the driving force transmitted from the turntable drive device controlled by the gantry control device 108 through the drive transmission system, and rotates around the subject.

  The X-ray detector 106 is a two-dimensional array of X-ray detection element groups configured by, for example, a combination of a scintillator and a photodiode in the channel direction (circumferential direction) and the column direction (body axis direction). Via the X-ray source 101. The X-ray detector 106 detects X-rays emitted from the X-ray source 101 and transmitted through the subject, and outputs the detected transmitted X-ray data to the data acquisition device 107.

The data collection device 107 is connected to the X-ray detector 106, collects transmission X-ray data detected by individual X-ray detection elements of the X-ray detector 106, and outputs it to the image reconstruction device 304.
The gantry control device 108 is a device that controls the rotation of the turntable 105 and the tilt of the scan gantry unit 100.

The bed 200 includes a bed control device 201, a top plate 202 on which a subject is placed, a top plate driving device 203, a vertical movement device 204, and the like.
The bed control device 201 controls the vertical movement device 204 to make the height of the top plate 202 in the vertical direction appropriate. The bed control device 201 controls the top plate driving device 203 to move the top plate 202 back and forth in the body axis direction (longitudinal direction of the top plate 202), or in a direction perpendicular to the body axis and the top plate. It is moved in a direction parallel to 202 (left and right direction). Thereby, the subject is carried into and out of the X-ray irradiation space of the scan gantry unit 100, and a position for irradiating X-rays is set.

  In the present embodiment, the bed 200 may include a position information acquisition device 205. The position information acquisition device 205 acquires position information of the subject. Specifically, the bed 200 incorporates a sheet-type pressure sensor in a mat or the like laid on the top board 202, and the position information acquisition device 205 has a top board when the subject is placed on the top board 202. The pressure information applied on 200 is acquired from the pressure sensor, and the position information is acquired based on the pressure information.

In addition, the position information acquisition device 205 may be an optical camera that is not provided in the bed 200 but is provided in the upper part of the front surface of the scan gantry unit 100 or the ceiling of the room where the X-ray CT apparatus 1 is installed. When the position information acquisition device 205 is an optical camera, image processing is performed from the acquired image to acquire the position information of the subject.
The position information acquisition device 205 is not limited to a technique that can be used as long as it can acquire the position information of the subject.

  The console 300 includes an input device 301, a display device 302, a system control device 303, an image reconstruction device 304, a storage device 305, and a bus 306. The console 300 is communicatively connected to the scan gantry unit 100 and the bed 200.

  The input device 301 includes, for example, a keyboard, a pointing device such as a mouse, an input device such as a numeric keypad, various switch buttons, and the like, and includes a subject name input by an operator, an examination date, an imaging condition, an imaging range, and the like. Various information and instructions are output to the system control device 303. An operator interactively operates the X-ray CT apparatus 1 using the display device 302 and the input device 301.

  The display device 302 includes a display device such as a liquid crystal panel, a CRT (Cathode-Ray Tube) monitor, and a liquid crystal display, and a logic circuit for executing display processing in cooperation with the display device, and is connected to the system control device 303. Is done. The display device 302 displays a reconstructed image and a fluoroscopic image (a scanogram image for positioning) output from the image reconstructing device 304 and various information handled by the system control device 303.

  The system control device 303 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The system control device 303 controls the X-ray control device 102, the collimator control device 104, the X-ray detector 106, the data collection device 107, and the gantry control device 108 in the scan gantry unit 100, and the bed in the bed 200. The controller 201 is controlled. In addition, the system control device 303 executes an imaging range control process (see FIGS. 2, 7, and 9) described later.

  The image reconstruction device 304 acquires transmission X-ray data collected by the data collection device 107 in the scan gantry unit 100 under the control of the system control device 303. At the time of photographing a fluoroscopic image (scanogram image), a fluoroscopic image is created using the fluoroscopic projection data collected by the data collecting device 107. Further, at the time of actual imaging, a tomographic image is reconstructed using transmission X-ray data of a plurality of views collected by the data collection device 107.

The storage device 305 is configured by a hard disk or the like, and is connected to the system control device 303 or the like. The storage device 305 stores perspective projection data and transmission X-ray data collected by the data collection device 107, a perspective image and a tomographic image generated by the image reconstruction device 304, and the like. In addition to these various image data, a program, an operating system (OS), and the like for realizing the functions of the X-ray CT apparatus 1 are stored.
The bus 306 connects each device constituting the console 300.

[First Embodiment]
Next, the operation of the X-ray CT apparatus 1 according to the first embodiment will be described with reference to the flowchart of FIG. 2 and FIGS. 3 to 6.
FIG. 2 is a flowchart showing the flow of the shooting range control process in the first embodiment. A system control device (CPU) 303 of the X-ray CT apparatus 1 reads a program and data related to an imaging range control process from the storage device 305 and executes a process based on the program and data.

  First, in step S1, the system control device 303 captures a fluoroscopic image. Specifically, the system control device 303 controls the scan gantry unit 100 to irradiate the subject with X-rays from one direction without rotating the turntable 102, and causes the top 202 to move in the body axis direction of the subject. By moving to a predetermined range, fluoroscopic imaging (scanogram imaging) is performed, fluoroscopic projection data is acquired, and the acquired fluoroscopic projection data is sent to the image reconstruction device 304. The image reconstruction device 304 creates a perspective image based on the perspective projection data and stores it in the storage device 305.

Next, in step S2, the system control device 303 acquires bed top plate information. The bed top plate information is information such as a movable range of the top plate 202 in the body axis direction. The movable range of the top plate 202 refers to a limit position where the top plate 202 can be moved in front of the scanner gantry unit 100 (front direction, hereinafter referred to as OUT direction) with respect to the bed 200. This is the distance that the top plate 202 moves when it moves to the limit position where it can move backward (in the depth direction, hereinafter referred to as the IN direction).
In addition, the system control device 303 sets the X-ray source of the scan gantry unit 100 and the end in the IN direction of the top plate 202 when the top plate 202 is moved to the limit position in the OUT direction. A distance L ₀ from a vertical line including the center of 101 is also acquired.

  Next, in step S <b> 3, the system control device 303 calculates the shooting range of the top plate 202. The imaging range of the top plate 202 is a vertical line including the center of the X-ray source 101 and the top plate when the top plate 202 is moved from a limit position where the top plate 202 can move in the OUT direction to a limit position where the top plate 202 can move. The intersection with 202 is the distance traveled on the top plate 202.

  FIG. 3 is a diagram illustrating a movable range of the top plate 202 and an imaging range of the top plate 202 when the X-ray CT apparatus 1 is viewed from a side surface perpendicular to the body axis direction and the vertical direction. A line including the center of the X-ray source 101 of the scan gantry unit 100 (hereinafter referred to as a center line) is set to 5, and a movable range of the top plate 202 with respect to the bed 200 is set to L.

As shown in FIG. 3, when the top plate 202 a is moved to the limit position 6 that is movable in the OUT direction with respect to the bed 200, the end of the top plate 202 a in the IN direction is L ₀ from the position of the center line 5. Only in the OUT direction.
When the top plate 202a is moved by the distance L to the limit position 7 that can be moved in the IN direction, the positional relationship is as shown in the top plate 202b. At this time, the intersection of the center line 5 and the top plate 202 is the top plate. The distance passed on 202 is L−L ₀ .
The system control device 303 sets the imaging range of the top plate 202 to L−L ₀ .

  Returning to FIG. Next, in step S4, the system control device 303 adjusts the shooting range of the top plate 202 calculated in step S3 based on the shooting conditions, and calculates a shooting possible range in actual shooting. That is, the imageable range is obtained by subtracting the distance D that varies depending on the imaging conditions from the IN direction and OUT direction of the imaging range of the top board 202. The system control device 303 calculates the distance D that varies depending on the shooting condition, using Expression (1).

  D1 shows the run-up distance or deceleration distance of the top plate 202. For photographing, a method of moving the top plate 202 every time one image is taken (hereinafter referred to as normal scan) and a method of moving the top plate 202 while photographing and taking a spiral image (hereinafter referred to as helical scan). ) At the time of the helical scan, the moving speed of the top plate 202 needs to be the set moving speed. At this time, the run distance until the top plate 202 reaches the set moving speed and the top plate 202 for stopping the top plate 202 are required. Deceleration distance is required. Therefore, in the helical scan, it is necessary to consider the approach distance and the deceleration distance in addition to the imaging range of the top plate 202. This value varies depending on the moving speed of the top plate 202. The system control device 303 acquires the run-up distance and the deceleration distance necessary for reaching the set moving speed from the bed control device 201 as D1. Note that D1 is 0 during normal scanning.

  D2 indicates a half value of the photographing width. FIG. 4 is a diagram illustrating an X-ray irradiation range 8 from the X-ray source 101 when the scan gantry unit 100 is viewed from the side surface perpendicular to the body axis direction and the vertical direction. As shown in FIG. 4, even when the X-ray source 101 reaches the imageable position 9 of the top plate 202, it is possible to image in the OUT direction or IN direction by the distance of D2 within the X-ray irradiation range 8. It becomes. This D2 also varies depending on the photographing width (opening width of the collimator 103) set in the photographing conditions. The system control device 303 calculates the imaging width by the product of the thickness per column of the X-ray detector 106 and the number of columns used for imaging, and acquires the half value as D2.

D3 indicates other correction distances. The other correction distance, and the distance L ₀ to be changed by the inclination angle at the time of the scan gantry unit 100 is tilt operation, distance and the like are changed by the thickness of the image to be reconstructed. The system control device 303 acquires the other correction distance as D3 from the gantry control device 108 or the like.

  The system control device 303 calculates the limit distance D in the OUT direction and the limit distance D ′ in the IN direction of the top panel 202 from the acquired D1, D2, and D3 according to Expression (1), and limits the imaging range of the top panel 202. It adjusts by distance D and D '. As a result of the adjustment, limit positions (limit positions) that can be photographed in the IN direction and OUT direction are determined. A range included between the limit positions in the IN direction and the OUT direction is set as a shootable range.

  FIG. 5 is a diagram showing the imageable range 11 and limit position 12 of the top plate 202. For example, the system control device 303 takes the z axis in the body axis direction, and the position obtained by adding the limit distance D in the OUT direction from the end in the OUT direction to the imaging range 10 of the top plate 202 is defined as the limit position 12a in the OUT direction. At the same time, a position obtained by subtracting the limit distance D ′ in the IN direction from the end in the IN direction is set as the limit position 12b in the IN direction, and the range between the limit position 12a and the limit position 12b is calculated as the shootable range 11.

  Returning to FIG. Next, in step S <b> 5, the system control device 303 displays a shooting range setting screen 41, which is a user interface including a limit position indicating a shooting range and a pointer for setting the shooting range, on the display device 302. .

  FIG. 6 is a diagram illustrating an example of the shooting range setting screen 41. The shooting range setting screen 41 includes a limit position 12, a marker 13, pointers 14 and 15, numerical values 16 and 17 indicating the shooting position, spin boxes 18 and 19, and the like.

  First, the system control device 303 displays the limit positions 12 in the IN direction and the OUT direction calculated in step S4 in a reduced manner according to the scale of the shooting range setting screen 41. Further, a marker 13 (“IN”, “OUT”) indicating the direction is displayed near the limit position 12 so that the direction can be understood. Next, a shooting start position pointer 14 and a shooting end position pointer 15 which are used when the operator sets the shooting range are displayed. Below the shooting start position pointer 14 and the shooting end position pointer 15, numerical values 16 and 17 (“0”, “120”) representing the shooting position with reference to a predetermined start position are displayed. The spin boxes 18 and 19 are displayed, and the shooting start position and the shooting end position can be input even when the keyboard or pointing device as the input device 301 is used.

  Next, in step S <b> 6, the system control device 303 displays the fluoroscopic image previously captured in step S <b> 1 on the imaging range setting screen 41. Specifically, as shown in FIG. 6, the system control device 303 reduces the fluoroscopic image 20 in accordance with the scale of the imaging range setting screen 41, and the subject is in the body axis direction of the fluoroscopic image 20. It rotates so that it is the same as the state where it is placed with respect to 202, and is displayed at the corresponding position on the screen.

  Next, in step S <b> 7, the system control device 303 receives the setting of the shooting range from the operator via the input device 301. Specifically, on the shooting range setting screen 41 shown in FIG. 6, the operator moves the pointers 14 and 15 using a keyboard and a pointing device, or inputs values into the spin boxes 18 and 19. Set the shooting range. The system control device 303 receives the set shooting range.

  Next, in step S8, the system control device 303 determines whether or not the accepted shooting range is within the shooting range calculated in step S4. To control. Specifically, when the operator sets the shooting range by moving the pointers 14 and 15 or inputting values with the spin boxes 18 and 19 on the shooting range setting screen 41 shown in FIG. The control device 303 determines whether or not it is within a photographing range. If it is out of the range, the pointers 14 and 15 are returned so as not to exceed the limit position 12 (shootable range), or the values of the spin boxes 18 and 19 are returned to values within the shotable range.

  Thereafter, in step S9, the system control device 303 controls the bed control device 201 of the bed 200 and the X-ray control device 102 of the scan gantry unit 100 and the like based on the set imaging range. Perform shooting operation.

As described above, the X-ray CT apparatus 1 (medical image diagnostic apparatus) according to the first embodiment has a limit that varies depending on imaging conditions with respect to the imaging range of the top plate 202 obtained from the movable range of the top plate 202. The photographing range is obtained by calculating the position, displayed on the display device, and the photographing range received from the operator is controlled to be the photographing range, and then the main photographing operation is performed.
Thereby, since the operator can know the range that can be imaged in the body axis direction at the time of shooting planning, it is possible to prevent a shooting failure caused by setting the shooting range outside the range that can be shot at the time of shooting.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 7 is a flowchart showing the flow of the shooting range control process according to the second embodiment. Steps S12 and S16 are different from the shooting range control process (FIG. 2) according to the first embodiment.

  First, in step S11, the system control apparatus 303 captures a fluoroscopic image.

  Next, in step S <b> 12, the system control device 303 acquires information on the bed 200 and the top plate 202 such as a movable range of the top plate 202 from the bed control device 201. At this time, the system control device 303 also acquires the current position of the top plate 202 with respect to the bed 200 (and the scan gantry unit 100) from the bed control device 201.

  Next, in step S <b> 13, the system control device 303 calculates the imaging range of the top plate 202. Next, in step S14, the system control device 303 calculates a shootable range based on the shooting range of the top plate 202 calculated in step S13.

  Next, in step S15, the system control device 303 displays a shooting range setting screen 42 (FIG. 8) that is a user interface including a limit position indicating a shooting range and a pointer for setting the shooting range. The device 302 is displayed.

  Next, in step S <b> 16, the system control device 303 displays a top panel diagram simulating the top panel 202 and a scan gantry diagram simulating the scan gantry unit 100 on the imaging range setting screen 42. Next, in step S <b> 17, the system control device 303 displays the fluoroscopic image in accordance with the shooting range setting screen 42 when the fluoroscopic image is previously captured.

  FIG. 8 is a diagram illustrating an example of the shooting range setting screen 42. The limit position 12 to the fluoroscopic image 20 are the same as the shooting range setting screen 41 according to the first embodiment.

The system control device 303 reduces the top panel 21 and the scan gantry 22 in accordance with the scale of the imaging range setting screen 42. A top board diagram 21 is displayed at a position corresponding to the actual ratio between the top board 202 and the limit position 12. Further, the system control device 303 calculates the position of the scan gantry unit 100 with respect to the top plate 202 from the current position of the top plate 202 with respect to the bed 200 (and the scan gantry unit 100) acquired in step S12, and the top plate according to the calculated position. A scan gantry diagram 22 is displayed at a position relative to FIG. That is, when the top plate 202 is moved, the position of the top plate figure 21 is not moved on the imaging range setting screen 42, but the corresponding position of the scan gantry figure 22 is updated.
The shooting range setting screen 42 has an IN / OUT direction inversion button 23. When the button is clicked, the limit position 12, the marker 13, the pointers 14 and 15, numerical values 16 and 17 indicating the shooting position, and the perspective image 20 are displayed. The display of the top plate figure 21 and the scan gantry figure 22 is reversed left and right.

  Returning to FIG. Next, in step S <b> 18, the system control device 303 accepts the setting of the shooting range from the operator via the input device 301. Next, in step S19, the system control device 303 determines whether or not the received shooting range is within the shooting range, and if it is out of the range, the system control device 303 performs control so as to be within the shooting range. Thereafter, in step S20, the system control device 303 controls the scan gantry unit 100 and the bed 200 based on the set imaging range, and performs the main imaging operation.

  With the X-ray CT apparatus 1 (medical image diagnostic apparatus) according to the second embodiment, the operator can specify a rough position where the limit position is on the top plate 202. This makes it possible to guide the subject to a position where imaging failure does not occur when the subject is placed on the top board 202.

  In addition, mainly in the X-ray CT apparatus 1, it is necessary to perform air calibration for periodically imaging air as part of maintenance. At this time, it is necessary to move the top plate 202 from the scan gantry unit 100. In the second embodiment, the current positional relationship between the scan gantry unit 100 and the top plate 202 is easily grasped on the user interface. Therefore, the air calibration can be performed smoothly.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS.
FIG. 9 is a flowchart showing the flow of the shooting range control process according to the third embodiment. The difference from the shooting range control process (FIG. 7) according to the second embodiment is that a fluoroscopic image is not shot and displayed, and step S26 and step S27.

  First, in step S <b> 21, the system control device 303 acquires information on the bed 200 and the top plate 202 such as a movable range of the top plate 202 from the bed control device 201. At this time, the system control device 303 also acquires the current position of the top plate 202 with respect to the bed 200 (and the scan gantry unit 100) from the bed control device 201.

  Next, in step S22, the system control device 303 calculates the imaging range of the top board 202. Next, in step S23, the system control device 303 calculates a shootable range based on the shooting range of the top plate 202 calculated in step S22.

  Next, in step S24, the system control device 303 displays a shooting range setting screen 43 (FIG. 10) which is a user interface including a limit position indicating a shooting range and a pointer for setting the shooting range. The device 302 is displayed.

  Next, in step S <b> 25, the system control device 303 displays a top panel diagram simulating the top panel 202 and a scan gantry diagram simulating the scan gantry unit 100 on the imaging range setting screen 43.

  Next, in step S <b> 26, the system control device 303 acquires the position information of the subject from the position information acquisition device 205 provided in the bed 200. Specifically, the position information acquisition device 205 acquires the position information (position coordinates) of the subject based on the pressure information obtained from the sheet-type pressure sensor laid on the top board 202, and the system control device 303. Acquires the position information and pressure information of the subject from the position information acquisition device 205.

  Next, in step S27, the system control device 303 images the subject position information or pressure information acquired in step S26 to form a subject position image, which is superimposed on the top view 21 of the imaging range setting screen 43. indicate.

FIG. 10 is a diagram illustrating an example of the shooting range setting screen 43. The limit position 12 to the spin box 19, the top plate figure 21, and the scan gantry figure 22 are the same as the imaging range setting screen 42 according to the second embodiment.
The system control device 303 reduces the subject position image 30 according to the scale of the imaging range setting screen 43, rotates the body axis direction, and displays the same on the top view 21.

  Returning to FIG. Next, in step S <b> 28, the system control device 303 accepts the setting of the shooting range from the operator via the input device 301.

  Next, in step S29, the system control device 303 determines whether or not the accepted shooting range is within the shooting range, and if it is out of the range, the system control device 303 performs control so as to be within the shooting range. Thereafter, in step S30, the system control device 303 controls the scan gantry unit 100 and the bed 200 based on the set imaging range, and performs the main imaging operation.

In step S26, the system control device 303 acquires the position information and pressure information of the subject from the position information acquisition device 205 provided in the bed 200. However, the position information acquisition device 205 is not limited to this.
For example, the position information acquisition device 205 may be an optical camera provided on the upper front surface of the scan gantry unit 100 or on the ceiling of a room where the X-ray CT apparatus 1 is installed. In this case, in step S <b> 26, the system control device 303 acquires a captured image from the position information acquisition device 205. In step S <b> 27, the system control device 303 appropriately performs image processing on the acquired image, generates the subject position image 30, and displays it on the top view 21 of the imaging range setting screen 43.

  The X-ray CT apparatus 1 (medical image diagnostic apparatus) according to the third embodiment determines whether or not the position of the subject is clear on the top board 202 and the imaging range is out of the imaging range. Can do. In addition, since the position of the subject can be specified, the imaging range can be set without taking a fluoroscopic image, and a reduction in the exposure amount of the subject can be expected.

  The preferred embodiments of the medical image diagnostic apparatus according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these naturally belong to the technical scope of the present invention. Understood.

1. X-ray CT system 100 .......... Scan gantry 101 ....... X-ray source 106 ....... X-ray Detector 108 …………………… Gantry control device 200 …………………… Bed bed 201 …………………… Bed bed control device 202 …………………… Top plate 205 …… ……………… Position information acquisition device 300 …………………… Console 301 …………………… Input device 302 …………………… Display device 303 ……………… …… System controller 10 ………………………… Shooting range of top plate 11 ………………………… Shooting range 12 ……………………… Limit position 13 ……… ……………… Marker 14, 15 ……………… Pointer 16, 17 ……………… Numerical value 18, 19 ……………… Spinning Box 20 ………………………… Transparent image 21 ……………………… Top view 22 ………………………… Scan gantry 20 ……………………… Image 30 ……………………… Subject position image 41, 42, 43 ……… Screen setting range

Claims (8)

An imaging device for imaging a subject;
A bed apparatus for carrying in and out of the imaging space of the imaging apparatus the tabletop on which the subject is placed;
A calculating means for calculating a photographing possible range in the body axis direction of the top plate according to photographing conditions;
Display means for displaying the calculated imageable range;
A medical image diagnostic apparatus comprising: The calculation means calculates a shooting range on the top plate from a movable range of the top plate in the body axis direction, and the calculated shooting range is a distance until the top plate reaches a predetermined speed with respect to the bed apparatus. The medical image diagnostic apparatus according to claim 1, wherein an imageable range in the body axis direction is calculated by adjusting based on a distance from the predetermined speed to the stop. The imaging apparatus images the subject placed on the top board with a predetermined imaging width in the body axis direction,
The calculation means calculates a shooting range on the top plate from a movable range of the top plate in the body axis direction, and adjusts the calculated shooting range based on a half value of the shooting width of the shooting device, The medical image diagnostic apparatus according to claim 1, wherein an imageable range in the body axis direction is calculated. An input means for inputting a shooting range;
Control means for controlling the imaging range to be within the range that can be imaged in the body axis direction when the input imaging range does not fall within the range that can be imaged in the body axis direction;
The medical image diagnostic apparatus according to any one of claims 1 to 3, further comprising: The medical image diagnostic apparatus according to claim 1, wherein the display unit displays a previously captured fluoroscopic image in a predetermined position. The medical image diagnostic apparatus according to claim 1, wherein the display unit displays a figure simulating the bed apparatus according to a predetermined position. Further comprising position information acquisition means for acquiring position information of the subject;
The medical image diagnostic apparatus according to claim 6, wherein the display unit displays the acquired position information of the subject in accordance with a diagram simulating the bed apparatus. A medical image diagnostic apparatus that includes an imaging device that images a subject, and a bed device that carries in and out of the imaging space of the imaging device a top plate on which the subject is placed, is executed.
A calculation step for calculating a range in which the top plate can be imaged according to imaging conditions;
A display step for displaying the calculated imageable range;
An imaging range display method comprising:

Images