JP5134912B2 - X-ray imaging apparatus and alignment adjustment support method - Google Patents

Description

  The present invention relates to an X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector and generates an image, and an X-ray imaging apparatus The present invention relates to an alignment adjustment support method.

  In recent years, an X-ray diagnostic apparatus having a flat panel detector (hereinafter referred to as “FPD (Flat Panel Detector)”) is generally used. Such an X-ray diagnostic apparatus is used by always rotating the FPD (fixed to the patient) because the holding device on which the FPD is mounted has a degree of freedom of rotation and the image receiving part of the FPD has a rectangular shape. Often done.

  For this reason, when installing the X-ray diagnostic apparatus, it is possible to always maintain the position of interest for fluoroscopy and imaging at the center of the image receiving section regardless of the rotation position of the FPD, and to arrange the blade position of the X-ray movable diaphragm at the correct position. In order to be able to do so, it is essential to adjust the position of each part in consideration of the rotation and movement of the FPD and X-ray movable diaphragm. Such position adjustment is generally called “alignment adjustment”, and various methods relating to alignment adjustment have been devised (see, for example, Patent Document 1).

  As a typical method for alignment adjustment, there is a method using an adjustment tool such as a beam alignment test tool or a collimator test tool. FIG. 8 is a diagram illustrating a conventional alignment adjustment method using an adjustment tool. As shown in FIG. 5A, in this method, a beam alignment test tool and a collimator test tool are arranged on the top plate, and then these tools are irradiated with X-rays.

  Here, as shown in FIG. 4B, the beam alignment test tool is provided with small spheres (detector-side spheres and tube-side spheres) at the centers of the upper and lower ends. Therefore, each small sphere is projected on the image generated from the X-rays transmitted through the beam alignment test tool. And when the direction in which the X-rays are irradiated is deviated or inclined from the straight line connecting the detector side sphere and the tube side sphere, as shown in FIG. The detector-side sphere and the tube-side sphere are projected out of alignment.

  The operator who performs alignment adjustment confirms the deviation between the detector-side sphere and the tube-side sphere on the generated image, while tilting the focus of the X-ray tube, the center of the FPD visible region, and the rotation axis. By adjusting the position so that the inclination of the diaphragm with respect to the center of the visible region and the rotation center axis, and the opening / closing center position of the diaphragm blade and the inclination with respect to the rotation center axis coincide with each other, the focus of the X-ray tube, FPD, etc. Alignment adjustment can be performed.

JP 2005-20548 A

  However, in the above-described conventional technology, various parts such as the center position adjustment of the FPD image receiving unit and the FPD rotation unit, the focus position adjustment of the X-ray tube, and the center adjustment of the X-ray movable diaphragm (rotation center, center adjustment of the diaphragm blades) Since this alignment adjustment is performed manually, there is a problem that it takes a very long time.

  Further, since the position adjustment of each part is an operation that depends on the ability of the operator, there is a problem that accuracy and stability are lacking. If the alignment is not performed correctly, the X-ray tube may be out of focus, the position of interest will be out of the image-receiving plane during FPD rotation, or the X-ray movable aperture opening / sag correction will be correct. It can lead to a serious problem of not working.

  The present invention has been made to solve the above-described problems caused by the prior art, and an X-ray imaging apparatus and alignment adjustment support method capable of accurately performing alignment adjustment in a short time regardless of the ability of the operator. The purpose is to provide.

In order to solve the above-described problems and achieve the object, the present invention generates an image by irradiating the subject on the top plate with X-rays and detecting the X-rays transmitted through the subject with an X-ray detector. An X-ray imaging apparatus that detects at least three images including a reference point placed on the top plate while rotating the X-ray detector about a predetermined rotation axis. A rotation axis coordinate calculation means for calculating the coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation means, and a calculation by the rotation axis coordinate calculation means. Detector adjustment movement amount calculation means for calculating the adjustment movement amount of the X-ray detector in alignment adjustment based on the amount of deviation between the coordinates of the rotation axis and the center of the X-ray detector. It is characterized by that.

In addition, the present invention supports alignment adjustment in an X-ray imaging apparatus that generates an image by irradiating an object on the top plate with X-rays and detecting the X-rays transmitted through the object with an X-ray detector. An alignment adjustment support method, comprising: generating at least three images including reference points placed on the top plate while rotating the X-ray detector around a predetermined rotation axis; and Alignment adjustment based on the step of calculating the coordinates of the rotation axis based on the coordinates of the reference point included in the image, and the amount of deviation between the calculated coordinates of the rotation axis and the center of the X-ray detector And calculating an adjustment movement amount of the X-ray detector.

According to the present invention, there is an effect that alignment adjustment can be performed accurately in a short time regardless of the ability of the operator.

  Exemplary embodiments of an X-ray imaging apparatus and an alignment adjustment support method according to the present invention will be described below in detail with reference to the accompanying drawings. Hereinafter, a case where the present invention is applied to an X-ray diagnostic apparatus will be described.

  First, the configuration of the X-ray diagnostic apparatus according to the present embodiment will be described. FIG. 1 is a functional block diagram showing the configuration of the X-ray diagnostic apparatus according to the present embodiment. As shown in the figure, the X-ray diagnostic apparatus 100 includes an X-ray control unit 10, a high voltage generator 20, an X-ray tube 30, an X-ray diaphragm device 40, a top plate 50, and a C arm 60. An FPD 70, a C-arm rotation / movement mechanism 110, a top-plate movement mechanism 120, a C-arm / top-plate mechanism control unit 130, an aperture control unit 140, an operation unit 150, an image generation unit 160, a display Unit 170, adjustment movement amount calculation unit 180, and system control unit 190.

  The X-ray control unit 10 is a control unit that controls the generation of X-rays by controlling the generation of a high voltage by the high-voltage generator 20, and the high-voltage generator 20 is a high voltage necessary for generating X-rays. Is a device that supplies the The X-ray tube 30 is a device that generates X-rays irradiated to the patient P using a high voltage supplied from the high-voltage generator 20, and the X-ray diaphragm device 40 is an X-ray generated by the X-ray tube 30. It is a device that shields. The top plate 50 is a plate on which the patient P lies, and the C arm 60 is an arm that supports the X-ray tube 30, the X-ray diaphragm device 40, the FPD 70, and the like. The FPD 70 is a device that detects X-rays transmitted through the patient P.

  The C-arm rotating / moving mechanism 110 is a mechanism that rotates or moves the C-arm 60 and moves the detector back-and-forth moving unit to which the FPD 70 is attached in the direction of the X-ray tube 30. The top plate moving mechanism 120 is a mechanism that rotates or moves the top plate 50. The C-arm / top plate mechanism control unit 130 drives the C-arm rotation / movement mechanism 110 and the top-plate movement mechanism 120 to rotate / move the C-arm 60 and the top plate 50 or move the detector back-and-forth movement unit 61. It is a control part to let you do. The aperture control unit 140 is a control unit that controls the X-ray irradiation range by rotating an X-ray aperture by the X-ray aperture device 40 or opening and closing aperture blades.

  Here, a holding device including the X-ray diaphragm device 40, the C arm 60, the FPD 70, the detector back-and-forth moving unit 61, and the C arm rotating / moving mechanism 110 will be described. FIG. 2 is a diagram illustrating the configuration of the holding device of the X-ray diagnostic apparatus according to the present embodiment.

  As shown in the figure, in this holding device, the upper end of the C-arm rotation / movement mechanism 110 is attached to a moving base 80 that moves on a rail laid on the ceiling surface, and the C-arm rotation / movement is performed. A C arm 60 is attached to the lower end of the mechanism 110. Further, the X-ray diaphragm device 40 is attached to one end of the C arm 60, and the detector back-and-forth moving part 61 is attached to the other end. An FPD 70 is attached to the detector longitudinal movement unit 61 so as to face the X-ray diaphragm device 40.

  Here, the upper end portion of the C-arm rotation / movement mechanism 110 is attached to the movement base 80 so as to be rotatable about a predetermined rotation axis, and the C-arm rotation / movement mechanism is centered on the rotation axis. By rotating 110, the X-ray diaphragm device 40 and the FPD 70 can also be rotated around the rotation axis.

  The detector back-and-forth moving part 61 is attached to the end of the C arm 60 so as to be able to reciprocate along the direction toward the X-ray tube 30. In the following, the direction approaching the X-ray tube 30 as viewed from the detector longitudinal movement unit 61 is referred to as “NEAR direction”, and conversely, the direction away from the X-ray tube 30 as viewed from the detector longitudinal movement unit 61 is referred to as “AWAY direction”. " By moving the detector back-and-forth movement unit 61 in the NEAR direction or the AWAY direction, the FPD 70 can also be moved in the NEAR direction or the AWAY direction.

  In such a holding device, the parts that need to be adjusted during alignment adjustment include the focal point of the X-ray tube 30, the FPD 70, and the X-ray diaphragm device 40. As shown in FIG. Adjustment movement in the rotation direction and tilt direction is required. Further, it is necessary to adjust and move the aperture rotation of the X-ray aperture device 40 and the position of the aperture blade.

  Returning to the description of FIG. 1, the operation unit 150 is a console that receives an instruction from an operator (here, “worker”) and transmits the received instruction to the system control unit 190. For example, the operation unit 150 receives an “alignment adjustment start instruction” for instructing the start of alignment adjustment, a “focus alignment completion notification” for indicating that the focus alignment has been completed, and the like from the operator who performs the alignment adjustment. .

  The image generation unit 160 is a processing unit that generates an image based on the X-rays detected by the FPD 70. The display unit 170 is a device that displays the image generated by the image generation unit 160, and includes a monitor that displays the image and a display control unit that controls display on the monitor.

  The adjustment movement amount calculation unit 180 is a processing unit that calculates the adjustment movement amount of each part in the alignment adjustment based on the image generated by the image generation unit 160 under the control of the system control unit 190 described later.

  Specifically, the adjustment movement amount calculation unit 180 is arranged on the top board 50 under the control of the system control unit 190 when the operation unit 150 receives an alignment adjustment start instruction from the operator. Based on the projected image of the detector-side sphere and the tube-side sphere of the beam alignment test tool, the amount of defocus of the X-ray tube 30 is calculated.

  FIG. 3 is a diagram for explaining the calculation of the focus shift amount by the adjustment movement amount calculation unit 180. The figure shows an example of an image generated from X-rays transmitted through a beam alignment test tool arranged on the top board 50. As shown in the figure, the adjustment movement amount calculation unit 180 detects the positions of the detector-side spheres and the tube-side spheres based on the pixel density, and the detected positions of the spheres in the X direction. And a deviation amount in the Y direction is calculated.

  Then, the adjustment movement amount calculation unit 180 applies the calculated displacement amount in the X direction and the Y direction to a predetermined scale to adjust the adjustment movement amount in the X direction of the focal point of the X-ray tube 30 in the alignment adjustment (for example, “A” mm) and an adjustment movement amount in the Y direction (for example, “b” mm) are obtained.

  When the operation unit 150 receives a focus alignment completion notification from the operator, the adjustment movement amount calculation unit 180 moves the detector back-and-forth movement unit 61 in the NEAR direction under the control of the system control unit 190. Beam alignment from the image generated by the image generation unit 160 after being moved to a predetermined amount and the image generated by the image generation unit 160 after moving the detector back-and-forth movement unit 61 by the predetermined amount in the AWAY direction. The coordinates of the tube-side small spheres of the test tool are detected, and the deviation amounts of the two detected tube-side small spheres in the X direction and Y direction are calculated.

  Then, the adjustment movement amount calculation unit 180 applies the adjustment movement amount in the X direction and the Y direction of the focal point of the X-ray tube 30 in the alignment adjustment by applying the calculated deviation amounts in the X direction and the Y direction to a predetermined scale. Ask for each.

  Further, the adjustment movement amount calculation unit 180 converts the image generated by the image generation unit 160 before rotating the FPD 70, the image generated by the image generation unit 160 after rotating the FPD 70 leftward, and the FPD 70 to the right. Based on the image generated by the image generation unit 160 after being rotated in the direction, the shift amount of the rotation center of the FPD 70 is calculated.

  FIG. 4 is a diagram for explaining calculation of the shift amount of the FPD rotation center by the adjustment movement amount calculation unit 180. This figure shows an image D generated by the image generation unit 160 when the FPD 70 is rotated 90 degrees in the left-right direction, and M is placed on the center of the region of interest, that is, on the top board 50. The center of the tube side sphere of the beam alignment test tool is shown. O represents the center of the image receiving surface of the FPD 70, and R represents the center of rotation of the FPD 70.

  As shown in the figure, specifically, the adjustment movement amount calculation unit 180 rotates the image D generated before rotating the FPD 70 (see (a) in the figure) and the FPD 70 leftward. An image D (see (b) in the figure) generated later by the image generation unit 160 and an image D (see (c) in the figure) generated by the image generation unit 160 after rotating the FPD 70 in the right direction. The coordinates of the region of interest center M included in each are detected. Further, the adjustment movement amount calculation unit 180 calculates the coordinates of the rotation center R of the FPD 70 based on the detected coordinates of the three regions of interest center M.

  FIG. 5 is a diagram illustrating an example of a coordinate calculation method of the rotation center by the adjustment movement amount calculation unit 180. In the figure, point (X1, Y1), point (X2, Y2) and point (X3, Y3) are respectively an image before rotating FPD 70, an image after rotating FPD 70 to the left, and The region-of-interest center M detected from the image after the FPD 70 is rotated rightward is shown.

  For example, the adjustment movement amount calculation unit 180 specifies a point at the same distance from the three detected region-of-interest centers M as the rotation center R of the FPD 70, as shown in FIG. The coordinates of the rotation center R are calculated by deriving a solution from the simultaneous cubic equations (X2, Y2) and (X3, Y3).

  Alternatively, for example, as shown in FIG. 5B, the adjustment movement amount calculation unit 180 is a straight line connecting the points (X1, Y1) and (X2, Y2) among the detected three center of interest parts M. The intersection of the perpendicular bisector and the perpendicular bisector of the straight line connecting the points (X1, Y1) and (X3, Y3) is specified as the rotation center R of the FPD 70, and its coordinates are calculated.

  After calculating the coordinates of the rotation center R in this way, the adjustment movement amount calculation unit 180 shifts in the X direction between the coordinates of the region-of-interest center M and the coordinates of the rotation center R in the image D before rotating the FPD 70 ( “C” shown in FIG. 4 and a deviation amount in the Y direction (“d” shown in FIG. 4) are respectively calculated.

  Then, the adjustment movement amount calculation unit 180 obtains the adjustment movement amounts of the FPD 70 in the X direction and the Y direction in the alignment adjustment by applying the calculated deviation amounts in the X direction and the Y direction to a predetermined scale, respectively.

  Further, the adjustment movement amount calculation unit 180 is configured to generate an image generated by the image generation unit 160 before rotating the diaphragm of the X-ray diaphragm device 40 and an image generation unit after rotating the diaphragm of the X-ray diaphragm device 40 leftward. Based on the image generated by 160 and the image generated by the image generating unit 160 after rotating the diaphragm of the X-ray diaphragm device 40 in the right direction, the shift amount of the rotation center of the diaphragm rotation is calculated.

  FIG. 6 is a diagram for explaining the calculation of the displacement amount of the aperture rotation center by the adjustment movement amount calculation unit 180. This figure shows an image D generated by the image generation unit 160 when the diaphragm of the X-ray diaphragm device 40 is rotated 45 degrees in the left-right direction, and M is the center of the region of interest, that is, the top plate. 50 shows the center of the tube-side sphere of the beam alignment test tool placed on 50. Q represents the center of the visible region surrounded by the diaphragm blades 41 to 44 of the X-ray diaphragm device 40, and S represents the rotation center of the diaphragm.

  As shown in the figure, specifically, the adjustment movement amount calculation unit 180 calculates the image D (see FIG. 10A) generated before rotating the diaphragm by the X-ray diaphragm device 40, and the diaphragm. An image D generated by the image generation unit 160 after rotating in the left direction (see (b) in the figure), and an image D generated by the image generation unit 160 after rotating the aperture in the right direction (in the same figure). (See (c)), the coordinates of the center Q of the visible region included in each of them are detected.

  Thereafter, the adjustment movement amount calculation unit 180 calculates the coordinates of the rotation center S of the diaphragm from the detected coordinates of the center Q of the three visible regions in the same manner as the coordinate calculation method shown in FIG. 5, and rotates the diaphragm. The amount of deviation in the X direction ("e" shown in the figure) and the amount of deviation in the Y direction ("f" shown in the figure) between the coordinates of the region of interest center M and the coordinates of the rotation center S of the aperture in the image before )).

  The adjustment movement amount calculation unit 180 applies the adjustment amounts of the X-ray diaphragm device 40 in the X direction and the Y direction in the alignment adjustment by applying the calculated deviation amounts in the X direction and the Y direction to a predetermined scale, respectively. Ask.

  Further, the adjustment movement amount calculation unit 180 is surrounded by the diaphragm blades 41 to 44 from the image generated by the image generation unit 160 after the diaphragm blades 41 to 44 of the X-ray diaphragm device 40 are closed to a predetermined diaphragm width. The center of the visible region is detected. Then, the adjustment movement amount calculation unit 180 calculates the amounts of deviation in the X direction and the Y direction between the center of the detected visible region and the center of the image receiving region of the FPD 70, respectively.

  Then, the adjustment movement amount calculation unit 180 obtains the adjustment movement amounts of the diaphragm blades in the X direction and the Y direction in the alignment adjustment by applying the calculated deviation amounts in the X direction and the Y direction to a predetermined scale, respectively.

  The system control unit 190 controls the entire X-ray diagnostic apparatus 100 by instructing the X-ray control unit 10, the C-arm / top plate mechanism control unit 130, the diaphragm control unit 140, and the like based on an instruction from the operation unit 150. It is a control unit.

  Specifically, when receiving an alignment adjustment start instruction from the operator via the operation unit 150, the system control unit 190 controls the X-ray control unit 10 to start X-ray irradiation. As a result, the image generation unit 160 generates an image in which the detector-side spheres and the tube-side spheres of the beam alignment test tool are projected.

  Thereafter, the system control unit 190 controls the adjustment movement amount calculation unit 180 to adjust the adjustment movement amount (for example, “a” mm) of the focal point of the X-ray tube 30 in the alignment adjustment in the X direction and the Y direction. Each adjustment movement amount (for example, “b” mm) is obtained, and the obtained adjustment movement amount is displayed on the display unit 170.

  In addition, when the system control unit 190 receives a focus adjustment completion from the operator via the operation unit 150, the system control unit 190 controls the C arm / top plate mechanism control unit 130 to drive the C arm rotation / movement mechanism 110. The detector back-and-forth moving part 61 is reciprocated in the NEAR direction / AWAY direction. Thereby, the image after the detector forward / backward movement unit 61 is moved by a predetermined amount in the NEAR direction by the image generation unit 160 and the image after the detector forward / backward movement unit 61 is moved by a predetermined amount in the AWAY direction are displayed. Each is generated.

  Thereafter, the system control unit 190 controls the adjustment movement amount calculation unit 180 to obtain adjustment movement amounts in the X direction and the Y direction of the focus of the X-ray tube 30 in the alignment adjustment, and the obtained adjustment movement amounts are obtained. Store in internal memory.

  Subsequently, the system control unit 190 controls the C-arm / top plate mechanism control unit 130 to drive the C-arm rotation / movement mechanism 110, thereby moving the FPD together with the C-arm 60 in the left and right directions by a predetermined angle. Rotate. Thereby, the image generation unit 160 generates an image before the FPD 70 is rotated, an image after the FPD 70 is rotated leftward, and an image after the FPD 70 is rotated rightward.

  Thereafter, the system control unit 190 controls the adjustment movement amount calculation unit 180 to obtain the adjustment movement amounts in the X direction and the Y direction of the FPD 70 in the alignment adjustment, and stores the obtained adjustment movement amounts in the internal memory. .

  Subsequently, the system control unit 190 controls the aperture control unit 140 to drive the X-ray aperture device 40, thereby rotating the aperture by a predetermined angle in the left and right directions. Thereby, the image before the aperture of the X-ray aperture device 40 is rotated by the image generation unit 160, the image after the aperture of the X-ray aperture device 40 is rotated to the left, and the aperture of the X-ray aperture device 40 An image after the image is rotated to the right is generated.

  Thereafter, the system control unit 190 controls the adjustment movement amount calculation unit 180 to obtain the adjustment movement amounts in the X direction and the Y direction of the X-ray diaphragm device 40 in the alignment adjustment, respectively. Store in memory.

  Subsequently, the system control unit 190 controls the aperture control unit 140 to drive the X-ray aperture device 40, thereby closing the aperture blades 41 to 44 until a predetermined aperture width is obtained. Thereby, the image generation unit 160 generates an image after closing the diaphragm blades 41 to 44 of the X-ray diaphragm device 40 until a predetermined diaphragm width is reached.

  Thereafter, the system control unit 190 controls the adjustment movement amount calculation unit 180 to obtain adjustment movement amounts in the X direction and Y direction of the diaphragm blades in alignment adjustment, and stores the obtained adjustment movement amounts in the internal memory. Let

  Then, the system control unit 190 reads out the adjustment movement amount of each adjustment part calculated so far from the internal memory, and displays it on the display unit 170.

  Next, a processing procedure for calculating the adjustment movement amount by the X-ray diagnostic apparatus 100 according to the present embodiment will be described. FIG. 7 is a flowchart illustrating a processing procedure for calculating the adjustment movement amount by the X-ray diagnostic apparatus 100 according to the present embodiment. Here, it is assumed that the beam alignment test tool is already arranged at a predetermined position on the top board 50 in advance.

  As shown in the figure, when the X-ray diagnostic apparatus 100 receives an alignment adjustment start instruction from the operator via the operation unit 150 (step S101, Yes), the system control unit 190 causes the X-ray control unit 10 to operate. Control is started to start X-ray irradiation (step S102).

  Then, the FPD 70 detects X-rays that have passed through the beam alignment test tool, and the image generation unit 160 generates an image based on the X-rays detected by the FPD 70. Subsequently, the system control unit 190 controls the adjustment movement amount calculation unit 180 to calculate the defocus amount of the X-ray tube 30 (step S103), and the focus of the X-ray tube 30 obtained from the calculated defocus amount. Is displayed on the display unit 170 (step S104).

  Thereafter, when a focus alignment completion notification is received from the operator via the operation unit 150 (Yes in step S105), the system control unit 190 controls the C arm / top plate mechanism control unit 130 to rotate and move the C arm. By driving the mechanism 110, the detector back-and-forth moving unit 61 is reciprocated in the NEAR direction / AWAY direction (step S106).

  Then, the system control unit 190 controls the adjustment movement amount calculation unit 180 to calculate the focus shift amount of the X-ray tube 30, and the focus adjustment shift amount of the X-ray tube 30 obtained from the calculated shift amount. Store in the internal memory (step S107).

  Subsequently, the system control unit 190 controls the C arm / top plate mechanism control unit 130 to drive the C arm rotation / movement mechanism 110, thereby moving the FPD 70 together with the C arm 60 to the left and right directions by a predetermined angle. Rotate (step S108). Then, the system control unit 190 controls the adjustment movement amount calculation unit 180 to calculate the deviation amount of the rotation center of the FPD 70, and stores the adjustment movement amount of the FPD 70 obtained from the calculated deviation amount in the internal memory (Step S1). S109).

  Subsequently, the system control unit 190 controls the aperture control unit 140 to drive the X-ray aperture device 40, thereby rotating the aperture by a predetermined angle in the left and right directions (step S110). Then, the system control unit 190 controls the adjustment movement amount calculation unit 180 to calculate the deviation amount of the rotation center of the diaphragm rotation, and the adjustment movement amount of the X-ray diaphragm device 40 obtained from the calculated deviation amount is stored in the internal memory. (Step S111).

  Subsequently, the system control unit 190 controls the diaphragm control unit 140 to drive the X-ray diaphragm device 40, thereby closing the diaphragm blades 41 to 44 until a predetermined diaphragm width is reached (step S112). Then, the system control unit 190 controls the adjustment movement amount calculation unit 180 to calculate the deviation amount of the opening / closing center of the diaphragm blade, and stores the adjustment movement amount of the diaphragm blade obtained from the calculated deviation amount in the internal memory. (Step S113).

  Thereafter, the system control unit 190 reads out the calculated adjustment movement amount of each adjustment part from the internal memory and displays it on the display unit 170 (step S114).

  As described above, in this embodiment, while the system control unit 190 rotates the X-ray detector, the image generation unit 160 moves the tube-side sphere of the beam alignment test tool placed on the top 50. At least three images are generated, and the adjustment movement amount calculation unit 180 calculates the coordinates of the rotation center based on the coordinates of the tube-side small spheres included in the generated images, and the calculated rotation center coordinates Since the adjustment movement amount of the FPD 70 in the alignment adjustment is calculated based on the amount of deviation between the center of the FPD 70 and the center of the FPD 70, the position adjustment of the FPD 70 can be easily performed using the calculated adjustment movement amount. The alignment of the FPD 70 can be accurately adjusted in a short time regardless of the amount of power.

  In the present embodiment, the system control unit 190 rotates the visible region in which the X-ray irradiation range is limited by the aperture of the X-ray aperture device 40 while rotating the visible region around a predetermined aperture rotation axis. At least three images are generated, and the adjustment movement amount calculation unit 180 calculates the coordinates of the aperture rotation axis based on the center coordinates of the visible region included in each generated image, and the calculated aperture rotation axis coordinates and Since the adjustment movement amount of the X-ray diaphragm device 40 in the alignment adjustment is calculated based on the amount of deviation from the center of the FPD 70, the position adjustment of the X-ray diaphragm device 40 can be easily performed using the calculated adjustment movement amount. Therefore, the alignment adjustment of the X-ray diaphragm device 40 can be accurately performed in a short time regardless of the ability of the operator.

  In this embodiment, the system control unit 190 moves the position of the FPD 70 along the direction toward the focal point of the X-ray tube 30 that generates X-rays, and the image generation unit 160 is placed on the top 50. At least two images including the tube-side sphere of the beam alignment test tool thus generated are generated, and the adjustment movement amount calculation unit 180 is based on the deviation amount of the coordinates of the tube-side sphere included in each of the generated images. Thus, since the adjustment movement amount of the focal point of the X-ray tube 30 in the alignment adjustment is calculated, it becomes possible to easily adjust the focal point of the X-ray tube 30 using the calculated adjustment movement amount. Regardless of this, the focus alignment of the X-ray tube 30 can be accurately adjusted in a short time.

  In this embodiment, after the system control unit 190 closes the diaphragm blades 41 to 44 of the X-ray diaphragm device 40 until a predetermined diaphragm width is reached, the image generation unit 160 is surrounded by the diaphragm blades 41 to 44. An image including the center of the visible region is generated, and the adjustment movement amount calculation unit 180 uses the amount of deviation between the coordinates of the center of the visible region included in the generated image and the center of the FPD 70 to adjust the aperture blade in the alignment adjustment. Therefore, it is possible to easily adjust the center position of the diaphragm blades using the calculated adjustment movement amount, and accurately align the diaphragm blades in a short time regardless of the operator's ability. Adjustments can be made.

  In this embodiment, the system control unit 190 displays each adjustment movement amount calculated by the adjustment movement amount calculation unit 180 on the display unit 170, so that the operator can easily grasp the adjustment movement amount. become.

  Further, in this embodiment, since the adjustment movement amount of each part in the alignment adjustment is automatically calculated, it is possible to eliminate variations in the adjustment work manually and to greatly shorten the alignment adjustment work time. In addition, the opening / sag correction of the X-ray movable diaphragm functions correctly.

  In addition, although the present Example demonstrated the case where an operator adjusted each adjustment part manually based on the adjustment movement amount computed by the X-ray diagnostic apparatus 100, this invention is limited to this. is not. For example, a mechanical adjustment mechanism may be provided in each adjustment unit of the X-ray diagnostic apparatus 100, and each adjustment unit may be automatically adjusted based on the calculated adjustment movement amount. Thereby, the burden of the operator in alignment adjustment can be further reduced.

  As described above, the X-ray imaging apparatus and the alignment adjustment support method according to the present invention are useful for an X-ray diagnostic apparatus including a holding device having a degree of freedom of rotation, and are particularly used while always rotating an FPD. Suitable for X-ray diagnostic equipment with many opportunities.

It is a functional block diagram which shows the structure of the X-ray diagnostic apparatus which concerns on a present Example. It is a figure which shows the structure of the holding | maintenance apparatus of the X-ray diagnostic apparatus which concerns on a present Example. It is a figure for demonstrating calculation of the deviation | shift amount of a focus by the adjustment movement amount calculation part. It is a figure for demonstrating calculation of the deviation | shift amount of the FPD rotation center by the adjustment movement amount calculation part. It is a figure which shows the example of the coordinate calculation method of the rotation center by the adjustment movement amount calculation part. It is a figure for demonstrating calculation of the deviation | shift amount of a diaphragm rotation center by the adjustment movement amount calculation part. It is a flowchart which shows the process sequence of adjustment movement amount calculation by the X-ray diagnostic apparatus which concerns on a present Example. It is a figure which shows the conventional alignment adjustment method using the tool for adjustment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 X-ray diagnostic apparatus 10 X-ray control part 20 High voltage generator 30 X-ray tube 40 X-ray aperture apparatus 41-44 Diaphragm blade 50 Top plate 60 C arm 61 Detector back-and-forth moving part 70 FPD (Flat Panel Detector)
80 Moving base 110 C-arm rotating / moving mechanism 120 Top-plate moving mechanism 130 C-arm / top-plate mechanism control unit 140 Aperture control unit 150 Operation unit 160 Image generation unit 170 Display unit 180 Adjustment movement amount calculation unit 190 System control unit

Claims (12)

An X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector to generate an image,
Detector rotation image generation means for generating at least three images including a reference point placed on the top plate while rotating the X-ray detector around a predetermined rotation axis;
Rotation axis coordinate calculation means for calculating the coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation means;
Detector adjustment movement for calculating an adjustment movement amount of the X-ray detector in alignment adjustment based on a deviation amount between the coordinates of the rotation axis calculated by the rotation axis coordinate calculation means and the center of the X-ray detector A quantity calculating means;
An aperture rotation image generating means for generating at least three images while rotating a visible region in which the X-ray irradiation range is limited by an X-ray aperture means around a predetermined aperture rotation axis;
Aperture rotation axis coordinate calculation means for calculating coordinates of the aperture rotation axis based on the center coordinates of the visible region included in each image generated by the aperture rotation image generation means;
Aperture adjustment for calculating an adjustment movement amount of the X-ray diaphragm means in alignment adjustment based on a deviation amount between the coordinates of the diaphragm rotation axis calculated by the diaphragm rotation axis coordinate calculation means and the center of the X-ray detector. A movement amount calculating means;
An X-ray imaging apparatus comprising:   An X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector to generate an image,
  Detector rotation image generation means for generating at least three images including a reference point placed on the top plate while rotating the X-ray detector around a predetermined rotation axis;
  Rotation axis coordinate calculation means for calculating the coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation means;
  Detector adjustment movement for calculating an adjustment movement amount of the X-ray detector in alignment adjustment based on a deviation amount between the coordinates of the rotation axis calculated by the rotation axis coordinate calculation means and the center of the X-ray detector A quantity calculating means;
  Detector movement that generates at least two images including a reference point placed on the top plate while moving the position of the X-ray detector along a direction toward the focal point of the X-ray tube that generates the X-ray. Image generating means;
  Focus adjustment movement amount calculation means for calculating the adjustment movement amount of the focus of the X-ray tube in alignment adjustment based on the deviation amount of the coordinates of the reference point included in each image generated by the detector movement image generation means; ,
  An X-ray imaging apparatus comprising:   An X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector to generate an image,
  Detector rotation image generation means for generating at least three images including a reference point placed on the top plate while rotating the X-ray detector around a predetermined rotation axis;
  Rotation axis coordinate calculation means for calculating the coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation means;
  Detector adjustment movement for calculating an adjustment movement amount of the X-ray detector in alignment adjustment based on a deviation amount between the coordinates of the rotation axis calculated by the rotation axis coordinate calculation means and the center of the X-ray detector A quantity calculating means;
  An aperture blade image generating means for generating an image including the center of the visible region surrounded by the aperture blades after closing the aperture blades of the X-ray aperture means to a predetermined aperture width;
  Based on the shift amount between the center coordinates of the visible region and the center of the X-ray detector included in the image generated by the aperture blade image generation means, the adjustment movement amount of the aperture blade in the alignment adjustment is calculated. Aperture blade adjustment movement amount calculating means;
  An X-ray imaging apparatus comprising:   An X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector to generate an image,
  Detector rotation image generation means for generating at least three images including a reference point placed on the top plate while rotating the X-ray detector around a predetermined rotation axis;
  Rotation axis coordinate calculation means for calculating the coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation means;
  Detector adjustment movement for calculating an adjustment movement amount of the X-ray detector in alignment adjustment based on a deviation amount between the coordinates of the rotation axis calculated by the rotation axis coordinate calculation means and the center of the X-ray detector A quantity calculating means;
  An aperture rotation image generating means for generating at least three images while rotating a visible region in which the X-ray irradiation range is limited by an X-ray aperture means around a predetermined aperture rotation axis;
  Aperture rotation axis coordinate calculation means for calculating coordinates of the aperture rotation axis based on the center coordinates of the visible region included in each image generated by the aperture rotation image generation means;
  Aperture adjustment for calculating an adjustment movement amount of the X-ray diaphragm means in alignment adjustment based on a deviation amount between the coordinates of the diaphragm rotation axis calculated by the diaphragm rotation axis coordinate calculation means and the center of the X-ray detector. A movement amount calculating means;
  Detector movement that generates at least two images including a reference point placed on the top plate while moving the position of the X-ray detector along a direction toward the focal point of the X-ray tube that generates the X-ray. Image generating means;
  Focus adjustment movement amount calculation means for calculating the adjustment movement amount of the focus of the X-ray tube in alignment adjustment based on the deviation amount of the coordinates of the reference point included in each image generated by the detector movement image generation means; ,
  An aperture blade image generating means for generating an image including the center of the visible region surrounded by the aperture blades after closing the aperture blades of the X-ray aperture means to a predetermined aperture width;
  Based on the shift amount between the center coordinates of the visible region and the center of the X-ray detector included in the image generated by the aperture blade image generation means, the adjustment movement amount of the aperture blade in the alignment adjustment is calculated. Aperture blade adjustment movement amount calculating means;
  Adjustment movement amount display for displaying each adjustment movement amount calculated by the detector adjustment movement amount calculation unit, the aperture adjustment movement amount calculation unit, the focus adjustment movement amount calculation unit, and the diaphragm blade adjustment movement amount calculation unit Means,
  An X-ray imaging apparatus comprising:   An X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector to generate an image,
  Detection for generating at least three images including a reference point placed on the top plate while rotating the X-ray detector about a predetermined rotation axis perpendicular to a plane including an image receiving surface of the X-ray detector Instrument rotating image generating means;
  Rotation axis coordinate calculation means for calculating the coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation means;
  Detector adjustment movement for calculating an adjustment movement amount of the X-ray detector in alignment adjustment based on a deviation amount between the coordinates of the rotation axis calculated by the rotation axis coordinate calculation means and the center of the X-ray detector A quantity calculating means;
  An X-ray imaging apparatus comprising:   An X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector to generate an image,
  At least including a reference point placed on the top plate while rotating the X-ray detector around a predetermined rotation axis so as to rotate the image receiving surface on a plane including the image receiving surface of the X-ray detector. Detector rotation image generation means for generating three images;
  Rotation axis coordinate calculation means for calculating the coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation means;
  Detector adjustment movement for calculating an adjustment movement amount of the X-ray detector in alignment adjustment based on a deviation amount between the coordinates of the rotation axis calculated by the rotation axis coordinate calculation means and the center of the X-ray detector A quantity calculating means;
  An X-ray imaging apparatus comprising:   An alignment adjustment support method for supporting alignment adjustment in an X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector to generate an image. And
  A detector rotation image generation step for generating at least three images including a reference point placed on the top plate while rotating the X-ray detector around a predetermined rotation axis;
  A rotation axis coordinate calculation step for calculating coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation step;
  Detector adjustment movement for calculating an adjustment movement amount of the X-ray detector in alignment adjustment based on a deviation amount between the coordinates of the rotation axis calculated in the rotation axis coordinate calculation step and the center of the X-ray detector A quantity calculating step;
  An aperture rotation image generation step for generating at least three images while rotating the visible region in which the X-ray irradiation range is limited by an X-ray aperture means around a predetermined aperture rotation axis;
  An aperture rotation axis coordinate calculation step for calculating coordinates of the aperture rotation axis based on the center coordinates of the visible region included in each image generated by the aperture rotation image generation step;
  Aperture adjustment for calculating an adjustment movement amount of the X-ray diaphragm means in alignment adjustment based on a deviation amount between the coordinates of the diaphragm rotation axis calculated by the diaphragm rotation axis coordinate calculation step and the center of the X-ray detector. A movement amount calculating step;
  An alignment adjustment support method comprising:   An alignment adjustment support method for supporting alignment adjustment in an X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector to generate an image. And
  A detector rotation image generation step for generating at least three images including a reference point placed on the top plate while rotating the X-ray detector around a predetermined rotation axis;
  A rotation axis coordinate calculation step for calculating coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation step;
  Detector adjustment movement for calculating an adjustment movement amount of the X-ray detector in alignment adjustment based on a deviation amount between the coordinates of the rotation axis calculated in the rotation axis coordinate calculation step and the center of the X-ray detector A quantity calculating step;
  Detector movement that generates at least two images including a reference point placed on the top plate while moving the position of the X-ray detector along a direction toward the focal point of the X-ray tube that generates the X-ray. An image generation step;
  A focus adjustment movement amount calculating step for calculating an adjustment movement amount of the focal point of the X-ray tube in the alignment adjustment based on a shift amount of coordinates of the reference point included in each image generated by the detector movement image generation step; ,
  An alignment adjustment support method comprising:   An alignment adjustment support method for supporting alignment adjustment in an X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector to generate an image. And
  A detector rotation image generation step for generating at least three images including a reference point placed on the top plate while rotating the X-ray detector around a predetermined rotation axis;
  A rotation axis coordinate calculation step for calculating coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation step;
  Detector adjustment movement for calculating an adjustment movement amount of the X-ray detector in alignment adjustment based on a deviation amount between the coordinates of the rotation axis calculated in the rotation axis coordinate calculation step and the center of the X-ray detector A quantity calculating step;
  A diaphragm blade image generating step of generating an image including the center of the visible region surrounded by the diaphragm blades after closing the diaphragm blades of the X-ray diaphragm means to a predetermined diaphragm width;
  Based on the shift amount between the coordinates of the center of the visible region and the center of the X-ray detector included in the image generated by the aperture blade image generation step, the adjustment movement amount of the aperture blade in the alignment adjustment is calculated. Aperture blade adjustment movement amount calculation step;
  An alignment adjustment support method comprising:   An alignment adjustment support method for supporting alignment adjustment in an X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector to generate an image. And
  A detector rotation image generation step for generating at least three images including a reference point placed on the top plate while rotating the X-ray detector around a predetermined rotation axis;
  A rotation axis coordinate calculation step for calculating coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation step;
  Detector adjustment movement for calculating an adjustment movement amount of the X-ray detector in alignment adjustment based on a deviation amount between the coordinates of the rotation axis calculated in the rotation axis coordinate calculation step and the center of the X-ray detector A quantity calculating step;
  An aperture rotation image generation step for generating at least three images while rotating the visible region in which the X-ray irradiation range is limited by an X-ray aperture means around a predetermined aperture rotation axis;
  An aperture rotation axis coordinate calculation step for calculating coordinates of the aperture rotation axis based on the center coordinates of the visible region included in each image generated by the aperture rotation image generation step;
  Aperture adjustment for calculating an adjustment movement amount of the X-ray diaphragm means in alignment adjustment based on a deviation amount between the coordinates of the diaphragm rotation axis calculated by the diaphragm rotation axis coordinate calculation step and the center of the X-ray detector. A movement amount calculating step;
  Detector movement that generates at least two images including a reference point placed on the top plate while moving the position of the X-ray detector along a direction toward the focal point of the X-ray tube that generates the X-ray. An image generation step;
  A focus adjustment movement amount calculating step for calculating an adjustment movement amount of the focal point of the X-ray tube in the alignment adjustment based on a shift amount of coordinates of the reference point included in each image generated by the detector movement image generation step; ,
  A diaphragm blade image generating step of generating an image including the center of the visible region surrounded by the diaphragm blades after closing the diaphragm blades of the X-ray diaphragm means to a predetermined diaphragm width;
  Based on the shift amount between the coordinates of the center of the visible region and the center of the X-ray detector included in the image generated by the aperture blade image generation step, the adjustment movement amount of the aperture blade in the alignment adjustment is calculated. Aperture blade adjustment movement amount calculation step;
  Adjustment movement amount display for displaying each adjustment movement amount calculated by the detector adjustment movement amount calculation step, the aperture adjustment movement amount calculation step, the focus adjustment movement amount calculation step, and the aperture blade adjustment movement amount calculation step Steps,
  An alignment adjustment support method comprising:   An alignment adjustment support method for supporting alignment adjustment in an X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector to generate an image. And
  Detection for generating at least three images including a reference point placed on the top plate while rotating the X-ray detector about a predetermined rotation axis perpendicular to a plane including an image receiving surface of the X-ray detector Container rotation image generation step;
  A rotation axis coordinate calculation step for calculating coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation step;
  Detector adjustment movement for calculating an adjustment movement amount of the X-ray detector in alignment adjustment based on a deviation amount between the coordinates of the rotation axis calculated in the rotation axis coordinate calculation step and the center of the X-ray detector A quantity calculating step;
  An alignment adjustment support method comprising:   An alignment adjustment support method for supporting alignment adjustment in an X-ray imaging apparatus that irradiates a subject on a top plate with X-rays and detects an X-ray transmitted through the subject with an X-ray detector to generate an image. And
  At least including a reference point placed on the top plate while rotating the X-ray detector around a predetermined rotation axis so as to rotate the image receiving surface on a plane including the image receiving surface of the X-ray detector. Detector rotation image generation step for generating three images;
  A rotation axis coordinate calculation step for calculating coordinates of the rotation axis based on the coordinates of the reference point included in each image generated by the detector rotation image generation step;
  Detector adjustment movement for calculating an adjustment movement amount of the X-ray detector in alignment adjustment based on a deviation amount between the coordinates of the rotation axis calculated in the rotation axis coordinate calculation step and the center of the X-ray detector A quantity calculating step;
  An alignment adjustment support method comprising:

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