JP2013158532A - Radiographic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiographic apparatus of which the imaging visual field can easily moved.SOLUTION: A radiographic apparatus includes a C-arm 7 rotated with a vertical direction as a rotary axis perpendicular to a subject M, and an X-ray tube 3, an FPD 4, a collimator 3a, and a collimator rotation mechanism 15 supported by the C-arm 7. When the C-arm 7 is rotated, the collimator 3a is rotated relative to the subject M, and an imaging visual field R defined by the collimator 3a is inclined relative to the subject M. Then, as the imaging visual field R is inclined relative to the subject M accompanying the rotating operation of the C-arm 7, a collimator rotation control part 16 controls the collimator rotation mechanism 15 so as to rotate the collimator 3a in a direction opposite to the inclination direction of the imaging visual field R, and holds the direction of the imaging visual field R relative to the subject M. In such a manner, an operator is released from a complicated operation of manually rotating the imaging visual field R.

Description

  The present invention relates to a radiation imaging apparatus that performs imaging of a subject by irradiating radiation, and particularly relates to a radiation imaging apparatus including a C-arm.

  A medical institution is provided with a radiation imaging apparatus that images a subject M by irradiating radiation. Such a radiation imaging apparatus includes a radiation source 53 that emits radiation and a detector 54 that detects the radiation, as shown in FIG. A top plate 52 on which the subject M is placed is provided between the radiation source 53 and the detector 54 (see, for example, Patent Document 1).

  The detector 54 and the radiation source 53 are supported by a C-arm 57 having a C shape. The C arm 57 has an arc shape, and a detector 54 is disposed at one end of the arc, and a radiation source 53 is disposed at the other end. The C arm 57 is supported by a support column 58, and the support column 58 is placed on a carriage 59. The top plate 52 is provided for the purpose of placing the subject.

  FIG. 19 shows the arrangement of each part when looking down at the subject M. The support column 58, the C arm 57, and the detector 54 are arranged in this order in the body side direction of the subject.

  In such an apparatus, there are cases where it is desired to change the field of view. The imaging field of view is a range in which an object is imaged in the apparatus. For example, there may be a case where the field of view indicated by R on the left side of FIG. 20 is moved in the body axis direction of the subject and moved to the position indicated by R on the right side of FIG. There are two methods for realizing such movement of the field of view. That is, there are a method of pivoting the C arm 57 and a method of moving the carriage 59 in the body axis direction.

  A method for pivoting the C-arm 57 will be described. In this method, first, as shown in the left side of FIG. Then, the detector 54 also moves and rotates in accordance with this, and the imaging visual field R is tilted while moving in the diagonally right direction with respect to the subject as shown on the right side of FIG.

  Next, the C arm 57 is moved in the body side direction of the subject as shown on the left side of FIG. 22 for the purpose of moving the imaging visual field R shifted to the right side with respect to the subject to the center of the body axis of the subject. Then, the detector 54 moves in accordance with this, and the imaging visual field R moves in the body side direction with respect to the subject as shown on the right side of FIG. Then, as shown on the right side of FIG. 23, the tilted field of view R is rotated so that the longitudinal direction and the short direction of the field of view R match the body side direction and body axis direction of the subject. This operation is realized by rotating a collimator attached to the detector 54 and the radiation source 53 (see the left side of FIG. 23).

  Next, a method for moving the carriage 59 in the body axis direction will be described. In this method, as shown in FIG. 24, the carriage 59 is moved in the body axis direction, and the relative position between the detector 54 and the subject M is adjusted in the body axis direction of the subject M.

JP 2010-063586 A

However, the conventional configuration has the following problems.
That is, according to the conventional configuration, there is a problem that the photographing field of view cannot be easily moved.

  First, the method of moving the field of view to be taken with the pivot rotation of the C-arm is very complicated. That is, the imaging field of view cannot be moved unless the surgeon rotates the C-arm, the C-arm, and the carriage, and the collimator and the detector.

  On the other hand, according to the method of moving the carriage in the body axis direction of the subject, the operation of the operator seems to be simple. But that is not the case. In an initial state before the imaging visual field shown in FIG. 18 is moved, the carriage 59 is in a state where it can approach and leave the subject M. That is, when the subject is placed on the top plate 52, if the C-arm 57 is positioned so as to sandwich the top plate 52, the subject placement is hindered. Therefore, before the subject is placed, the C-arm 57 is separated from the top plate 52. After placing the subject on the top plate 52, the C-arm 57 is brought close to the subject to obtain the state shown in FIG.

  At this time, the body side direction of the subject is selected as the moving direction of the C arm 57. This is because the movement of the C arm 57 can be minimized.

  It is not easy to change the C-arm 57 from the state in which the C-arm 57 is movable in the body side direction of the subject to the state in which the C-arm 57 is movable in the body axis direction of the subject. That is, first, the rotation prohibition lock applied to the wheel of the carriage 59 must be removed. The rotation at this time is rotation of the rotation shaft that changes the rotation axis of the wheel from the body side direction to the body axis direction, and is not simply rotation of the wheel. Then, after unlocking, the wheel is rotated to change the traveling direction of the wheel by 90 °. Only after this stage can the carriage 59 be moved in the body axis direction.

  In this series of operations, the carriage 59 constituting the radiation imaging apparatus must be operated. However, the carriage part in the radiographic apparatus is not sufficiently sterilized as compared with the C arm 57 part. Therefore, the surgeon must perform sterilization work each time the carriage 59 is operated.

  Thus, in the conventional configuration, the photographing field of view cannot be easily moved regardless of which method is employed.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a radiation imaging apparatus capable of easily moving the imaging visual field.

The present invention has the following configuration in order to solve the above-described problems.
That is, the radiographic apparatus according to the present invention includes a radiation source that emits radiation, a detection unit that detects radiation that has passed through the subject, and an image generation that generates an image based on a detection signal output from the detection unit. Means, input means for inputting an operator's instructions, a collimator for changing the field of view by limiting the spread of radiation emitted from the radiation source, and a collimator around the collimator rotation axis extending in the radiation irradiation direction. Collimator rotating means for rotating with respect to the radiation source, radiation source, detecting means, collimator, arm for supporting the collimator rotating means, a support for supporting the arm, and an arm rotation axis extending in the vertical direction and passing through the support The arm that rotates the imaging field of view relative to the subject by rotating the arm and each device supported by the arm. A rotation means, an arm rotation control means for controlling the arm rotation means in accordance with the operator's instruction input to the input means, and an imaging field of view is covered by the rotation of the arm after the direction holding instruction is input to the input means. A collimator rotation control means for controlling the collimator rotating means so that the collimator rotates in the direction opposite to the direction in which the imaging visual field is inclined according to the inclination with respect to the specimen, and maintaining the orientation of the imaging visual field with respect to the subject; It is characterized by comprising.

  [Operation / Effect] The radiation imaging apparatus according to the present invention includes an arm and a radiation source indicated by the arm, a detection unit, a collimator, and a collimator rotation unit. This arm can rotate with respect to the subject as a rotation axis in the vertical direction. When the arm is rotated, the collimator rotates with respect to the subject, and the field of view defined by the collimator is inclined with respect to the subject. Therefore, the collimator rotation control means according to the present invention provides collimator rotation means so that the collimator rotates in the direction opposite to the direction in which the imaging field of view is tilted as the imaging field of view tilts with respect to the subject as the arm rotates. To maintain the orientation of the field of view for the subject. In this way, the direction of the imaging field of view with respect to the subject is always constant regardless of the rotation of the arm, and the operator is free from the complicated operation of manually rotating the imaging field of view. In addition, the present invention includes input means for selecting whether or not to automatically rotate the collimator. Thereby, the surgeon can freely select the operation according to the present invention and the operation of the conventional apparatus.

  In the radiographic apparatus described above, the detector rotating means for rotating the detecting means relative to the arm around the detector rotating axis orthogonal to the detection surface for detecting radiation in the detecting means, and the direction holding instruction to the input means After the image is input, the detector follows the inclination of the subject image and rotates as the subject image reflected in the image generated by the image generation means inclines with respect to the image as the arm rotates. It is more desirable to provide detector rotation control means for controlling the detector rotation means to maintain the orientation of the image with respect to the subject.

  [Operation / Effect] The above-described configuration represents a more desirable form of the present invention. That is, when the arm is rotated, the detector rotates with respect to the subject, and the orientation of the image defined by the detector is inclined with respect to the subject. Therefore, the detector rotation control means of the present invention detects the inclination of the subject image according to the inclination of the subject image reflected in the image generated by the image generation means with the rotation of the arm. The detector rotating means is controlled so as to follow and rotate to maintain the orientation of the image with respect to the subject. In this way, the orientation of the image with respect to the subject is always constant regardless of the rotation of the arm, and the operator is free from the complicated operation of manual rotation of the image. Further, the present invention includes an input means for selecting whether or not to automatically rotate the image. Thereby, the surgeon can freely select the operation according to the present invention and the operation of the conventional apparatus.

  Further, in the above-described radiographic apparatus, after the direction holding instruction is input to the input unit, the subject image reflected in the image generated by the image generation unit is tilted with respect to the image as the arm rotates. Accordingly, it is more desirable to provide image rotation means for rotating the image so as to follow the inclination of the subject image and maintaining the orientation of the image with respect to the subject.

  [Operation / Effect] The above-described configuration represents a more desirable form of the present invention. That is, when the arm is rotated, the detector rotates with respect to the subject, and the orientation of the image defined by the detector is inclined with respect to the subject. Therefore, the image rotation means of the present invention follows the inclination of the subject image as the subject image reflected in the image generated by the image generation means inclines with respect to the image as the arm rotates. The orientation of the image relative to the subject is maintained by rotating the image. In this way, the orientation of the image with respect to the subject is always constant regardless of the rotation of the arm, and the operator is free from the complicated operation of manual rotation of the detection means. Further, the present invention is provided with an input means for selecting whether or not the detection means is automatically rotated. Thereby, the surgeon can freely select the operation according to the present invention and the operation of the conventional apparatus.

  Further, in the above-described radiographic apparatus, an arm moving unit that moves the support column in a horizontal direction orthogonal to the vertical direction to move the arm and each device supported by the arm while maintaining the relative position of each other; It is more desirable to provide arm movement control means for controlling the arm movement means in accordance with the operator's instructions input to the input means.

  [Operation / Effect] The above-described configuration shows a more specific configuration of the present invention. If an arm moving means for moving the arm in the horizontal direction is provided, a radiation imaging apparatus capable of imaging with a higher degree of freedom can be provided.

  In the above-described radiation imaging apparatus, it is more desirable that the arm is a C-arm.

  [Operation / Effect] The above-described configuration shows a more specific configuration of the present invention. The present invention is applicable to a radiographic apparatus having a C-arm.

  In the above-described radiation imaging apparatus, it is more desirable that the input unit is disposed on the detection unit.

  [Operation / Effect] The above-described configuration shows a more specific configuration of the present invention. If the input means is arranged in the detection means, the surgeon can move the arm without helping anyone while the sterilized state is maintained.

  In the above-described radiation imaging apparatus, it is more desirable that the input unit is provided with a lock button for inputting a direction holding instruction.

  [Operation / Effect] The above-described configuration shows a more specific configuration of the present invention. If a lock button is provided on the input means, and the operator is instructed to hold the direction through this lock button, a radiation imaging apparatus with improved operability can be provided.

  The radiation imaging apparatus according to the present invention includes an arm that can rotate with respect to a subject as a rotation axis, a radiation source indicated by the arm, a detection unit, a collimator, and a collimator rotation unit. When the arm is rotated, the collimator rotates with respect to the subject, and the field of view defined by the collimator is inclined with respect to the subject. Therefore, the collimator rotation control means according to the present invention provides collimator rotation means so that the collimator rotates in the direction opposite to the direction in which the imaging field of view is tilted as the imaging field of view tilts with respect to the subject as the arm rotates. To maintain the orientation of the field of view for the subject. In this way, the operator is freed from the cumbersome operation of manually rotating the field of view.

1 is a functional block diagram illustrating a configuration of an X-ray imaging apparatus according to Embodiment 1. FIG. FIG. 6 is a schematic diagram illustrating rotation of a C arm according to the first embodiment. FIG. 6 is a schematic diagram illustrating rotation of a C arm according to the first embodiment. It is a schematic diagram explaining the movement of the trolley | bogie which concerns on Example 1. FIG. 3 is a schematic diagram illustrating a configuration of a collimator according to Embodiment 1. FIG. FIG. 3 is a plan view illustrating an operation unit according to the first embodiment. FIG. 6 is a schematic diagram for explaining the operation of a collimator rotation control unit according to the first embodiment. FIG. 6 is a schematic diagram for explaining the operation of a collimator rotation control unit according to the first embodiment. FIG. 6 is a schematic diagram for explaining the operation of the image rotation unit according to the first embodiment. FIG. 6 is a schematic diagram for explaining the operation of the image rotation unit according to the first embodiment. 3 is a flowchart for explaining the operation of the X-ray imaging apparatus according to Embodiment 1; FIG. 3 is a schematic diagram for explaining the operation of the X-ray imaging apparatus according to Embodiment 1. FIG. 3 is a schematic diagram for explaining the operation of the X-ray imaging apparatus according to Embodiment 1. FIG. 3 is a schematic diagram for explaining the operation of the X-ray imaging apparatus according to Embodiment 1. 6 is a schematic diagram illustrating a detector according to Embodiment 2. FIG. FIG. 10 is a schematic diagram for explaining the operation of a detector rotation control unit according to the second embodiment. 6 is a flowchart illustrating an operation of the X-ray imaging apparatus according to the second embodiment. It is a schematic diagram explaining the structure of the conventional X-ray imaging apparatus. It is a schematic diagram explaining the structure of the conventional X-ray imaging apparatus. It is a schematic diagram explaining the structure of the conventional X-ray imaging apparatus. It is a schematic diagram explaining the structure of the conventional X-ray imaging apparatus. It is a schematic diagram explaining the structure of the conventional X-ray imaging apparatus. It is a schematic diagram explaining the structure of the conventional X-ray imaging apparatus. It is a schematic diagram explaining the structure of the conventional X-ray imaging apparatus.

  Hereinafter, examples of the present invention will be described. X-rays in the examples correspond to the radiation of the present invention. FPD is an abbreviation for flat panel detector.

<Configuration of X-ray imaging apparatus>
As shown in FIG. 1, an X-ray imaging apparatus 1 according to the first embodiment includes a top plate 2 on which a subject M is placed, and an X-ray tube 3 that emits X-rays provided below the top plate 2. The FPD 4 that detects X-rays transmitted through the subject M provided above the top 2, the X-ray tube controller 6 that controls the tube current and tube voltage of the X-ray tube 3, and the X-ray tube 3 , FPD 4, a C arm 7 that supports a collimator 3 a and a collimator rotating mechanism 15 described later, a support column 8 that supports the C arm 7, a C arm rotating mechanism 21 that rotates the C arm 7, and a C arm that controls the C arm 7. And a rotation control unit 22. The X-ray tube 3 corresponds to the radiation source of the present invention, and the FPD 4 corresponds to the detection means of the present invention. The C arm 7 corresponds to the arm of the present invention.

  The C arm 7 can also be rotated by a C arm rotation mechanism 21. That is, the C-arm 7 can be rotated along a virtual circle VA along which the curved C-arm 7 is curved as shown on the left side of FIG. When the projecting direction is the projecting direction, the C-arm 7 can also rotate so that both ends thereof are along a virtual circle VB on a plane orthogonal to the projecting direction. The virtual circle VA is on the plane where the C-arm 7 exists. The C arm rotation mechanism 21 corresponds to the arm rotation means of the present invention. In the following description, it is assumed that the C arm 7 is rotated so that the FPD 4 is positioned on the vertical upper side and the X-ray tube 3 is positioned on the lower vertical side, and the C arm 7 is further moved to the virtual circle VA and the virtual circle VB. Shall not rotate.

  In addition to the rotation described above, the C-arm 7 can rotate around a vertically extending arm rotation axis AXa as shown on the left side of FIG. The arm rotation axis AXa is an axis that penetrates the vertically extending support column 8. In this way, the C arm rotation mechanism 21 can rotate the C arm 7 around three axes orthogonal to each other. The right side of FIG. 3 is a view looking down from the vertical direction of the C-arm 7 being rotated about the arm rotation axis AXa. When the C arm 7 is rotated, the tip of the C arm 7 rotates while drawing a locus of a virtual circle VC orthogonal to the arm rotation axis AXa. In the following description, it is assumed that the rotation axis AXa is not changed from a state of extending in the vertical direction.

  When the C-arm rotation mechanism 21 rotates the C-arm 7, each device instructed to the C-arm 7 is also rotated. That is, the X-ray tube 3, the FPD 4, and a collimator 3 a to be described later rotate so as to follow the rotation of the C arm 7 while maintaining the mutual positional relationship. Due to the rotation of the C-arm 7, the positions of the X-ray tube 3 and the FPD 4 with respect to the subject M vary. Therefore, the position of the imaging visual field R relative to the subject M is moved by the rotation of the C arm 7.

  The C-arm rotation control unit 22 is provided for the purpose of controlling the C-arm rotation mechanism 21. The C-arm rotation control unit 22 controls the C-arm rotation mechanism 21 according to an operator's instruction. An operator's input is performed through the detector attached operation part 31 attached to FPD4. The C-arm rotation control unit 22 corresponds to the arm rotation control unit of the present invention, and the detector attached operation unit 31 corresponds to the input unit of the present invention.

<Composition of cart>
Next, the carriage 23 that moves the C-arm 7 will be described. The carriage 23 has wheels as shown in FIG. When the carriage 23 is moved on the floor surface of the examination room, the C-arm 7 and the column 8 are moved following the carriage 23. As for the wheel mounted in the trolley | bogie 23, the rotation direction of a wheel is being fixed. Accordingly, the carriage 23 can only move on a certain straight line. If you want to move the carriage 23 in the other direction, once you have fixed the rotation direction of the wheel through the carriage-attached operation part 23a mounted on the carriage 23, adjusted the rotation direction, and then changed the rotation direction again. Operates to fix. If it does in this way, since the rotation direction of the wheel was changed, the trolley | bogie 23 will be able to move in the direction different from the previous one. The carriage 23 moves the support column 8 in the horizontal direction perpendicular to the vertical direction, so that the C arm 7 and each device (X-ray tube 3, FPD 4, collimator 3a, etc.) supported by the C arm 7 are positioned relative to each other. Move while keeping The carriage movement control unit 24 controls the movement of the carriage 23 in accordance with the operator's instruction input to the detector attached operation unit 31. The carriage 23 corresponds to the arm movement means of the present invention, and the carriage movement control unit 24 corresponds to the arm movement control means of the present invention.

  The operation unit 23a attached to the carriage is an operation panel attached to the carriage 23 and is provided for the purpose of inputting an operator's instruction. The carriage movement control unit 24 controls the movement of the carriage 23 in accordance with the operator's instruction input to the carriage attachment operation unit 23a. The carriage movement control unit 24 is set so as to be able to receive a carriage movement instruction without using the carriage attachment operation unit 23a. That is, the carriage movement control unit 24 can move the carriage 23 linearly also in accordance with an instruction from the detector attached operation unit 31 attached to the FPD 4. However, the change of the moving direction of the carriage 23 cannot be operated from the detector attached operation unit 31.

<Configuration of collimator>
The X-ray tube 3 is provided with a collimator 3a that limits the X-ray irradiation range and changes the X-ray field of view R by limiting the X-ray irradiation range (see FIG. 1). The collimator 3a can adjust the opening degree. As shown on the left side of FIG. 5, the collimator 3a has a pair of leaves 3b that move mirror-symmetrically with respect to the collimator rotation axis AXc, and another pair that moves mirror-symmetrically with reference to the collimator rotation axis AXc. A leaf 3b is provided. The collimator 3a can move the leaf 3b to irradiate the entire detection surface of the FPD 4 with cone-shaped X-rays B. For example, the collimator 3a emits fan-shaped X-rays B only at the center of the detection surface. It can also be irradiated. The leaf 3b is movable, and the opening degree of the collimator 3a can be changed.

  Also, one of the two pairs of leaves 3b is for adjusting the spread of the X-ray B having a quadrangular pyramid shape in the body axis direction A, and the other pair of leaves 3b is the X-ray B The spread in the body side direction S is adjusted. The collimator rotation axis AXc, which serves as a reference for the movement of the leaf 3b, is also an axis indicating the center of the X-ray B. The collimator rotation axis AXc is a straight line from the X-ray tube 3 to the FPD 4 and penetrates the centers of the X-ray tube 3 and the FPD 4. As described above, since the FPD 4 and the X-ray tube 3 are arranged in the vertical direction, the collimator rotation axis AXc also extends in the vertical direction.

  The collimator 3 a is attached to the X-ray tube 3. Therefore, when the X-ray tube 3 is moved, the collimator 3 a is also moved along with the X-ray tube 3.

<Configuration of operation unit attached to detector>
FIG. 6 shows a configuration of the detector attached operation unit 31 attached to the FPD 4. As shown in FIG. 6, the detector-attached operation unit 31 has a plurality of buttons arranged at both ends, and the operator can input the operator's instructions to the apparatus by operating these buttons. .

  The buttons provided in the detector attached operation unit 31 will be described. As can be seen from FIG. 6, the buttons are arranged in two rows at both ends of the detector-attached operation unit 31. The reason for arranging the buttons in this way corresponds to the surgeon with different dominant arms. Therefore, one button having the same function is provided at each end of the detector-attached operation unit 31.

  The detector-attached operation unit 31 is provided with, for example, a C-arm lock button for inputting instructions for prohibiting and releasing the movement of the C-arm 7. The detector attached operation unit 31 is provided with a collimator opening / closing button for inputting an instruction to adjust the opening degree of the collimator 3a.

  As a configuration unique to the present invention, the detector-attached operation unit 31 is provided with a direction holding button for inputting an instruction to prohibit and release the imaging field of view R and rotation of the four sides of the image with respect to the subject M. ing. When the direction holding button is pressed, the collimator rotation control unit 16 and the image rotation unit 12 operate according to the rotation of the C arm 7 around the virtual circle VC (see FIG. 3). When the pressing of the direction holding button is released, the collimator rotation control unit 16 and the image rotation unit 12 do not operate even if the C arm 7 rotates around the virtual circle VC. The image rotation unit 12 corresponds to the image rotation unit of the present invention, and the collimator rotation control unit 16 corresponds to the collimator rotation control unit of the present invention.

  When the direction holding button is pressed, the subject M and the field of view R are not inclined with respect to the four sides of the image even if the C-arm 7 is rotated. This is because the collimator rotation control unit 16 and the image rotation unit 12 adjust the inclination of the imaging visual field R with respect to the subject M and the inclination of the four sides of the image in accordance with the rotation of the C arm 7. The actual operation will be described later.

  The detector attached operation unit 31 includes a U-shaped lever 9. In FIG. 6, since the U-shaped lever 9 is viewed from the bottom, the lever 9 is simply depicted as a bar. In FIG. 10, since the lever 9 is drawn in U shape, please refer to this. The operation through the lever 9 will be described. When the operator applies a force to the lever 9, the C arm 7 moves in the direction in which the force is applied. For example, when the operator applies a force to the lever 9 so as to rotate the C-arm 7 about the arm rotation axis AXa described in FIG. 3, the C-arm rotation control unit 22 applies the force to the lever 9. Rotate C-arm 7 in the direction Then, the C-arm rotation control unit 22 stops the C-arm 7 when the operator stops applying a force to the lever 9.

  Similarly, when the surgeon applies a force in the movement direction of the carriage 23 to the lever 9, the carriage movement control unit 24 moves the carriage 23 in the direction in which the surgeon applies the force to the lever 9. Then, the carriage movement control unit 24 stops the carriage 23 when the operator stops applying the force to the lever 9.

  In this manner, a sensor for realizing an operation through the lever 9 is provided in the X-ray imaging apparatus. That is, the X-ray imaging apparatus is provided with a sensor for detecting the strength and direction of the force applied to the lever 9, and the C-arm rotation control unit 22 and the carriage movement control unit 24 are configured to detect the C-arm according to the output of the sensor. Each of the rotation mechanism 21 and the carriage 23 is controlled.

<Rotation control of collimator>
The rotation of the collimator 3a will be described. The collimator 3a is provided with a collimator rotating mechanism 15 that rotates the collimator 3a relative to the X-ray tube 3 around a collimator rotation axis AXc extending in the X-ray irradiation direction (see FIG. 1). The collimator rotation control unit 16 is provided for the purpose of controlling the collimator rotation mechanism 15. When the collimator rotating mechanism 15 rotates the collimator 3a, the collimator rotation axis AXc is centered with respect to the X-ray tube 3 in a state where the leaves 3b constituting the collimator 3a maintain relative positions to each other as shown on the right side of FIG. Rotate to. That is, the collimator rotation axis AXc is a rotation axis (collimator rotation axis) for rotating the collimator 3a. The collimator rotating mechanism 15 corresponds to the collimator rotating means of the present invention.

  The actual operation of the collimator rotation control unit 16 will be described. For example, it is assumed that the X-ray irradiation range that is rectangular is as shown by the broken line in FIG. The irradiation range of the X-ray beam is a range on the subject or the top 2 where X-rays emitted from the X-ray tube 3 are irradiated. In the irradiation range in FIG. 7, the four sides are not along the body axis and the body side of the subject M, and are inclined with respect to the subject M. This X-ray irradiation range is a range in which the subject M is imaged, and is also an imaging field of view of the X-ray imaging apparatus 1.

  In this way, the irradiation range (imaging field of view) is inclined with respect to the subject M. Actually, the collimator 3a is as shown on the left side of FIG. 8 as the C arm rotates around the virtual circle VC shown in FIG. It is because it inclined to. When the X-ray tube 3 is rotated along the virtual circle VC shown in FIG. 3, the collimator 3 a attached to the X-ray tube 3 is also rotated and the collimator 3 a is inclined with respect to the subject M. When imaging is performed with the collimator 3a tilted, imaging is performed by irradiating X-rays to a vertically long region from the right shoulder of the subject M to the left waist. In the original image P0 photographed in such a state, an image from the right shoulder to the left waist of the subject M is captured. As described above, the field of view R rotates with respect to the subject M as the C arm 7 rotates.

  The collimator rotation control unit 16 appropriately rotates the collimator 3 a as the C arm 7 rotates. FIG. 8 shows how the collimator is rotated by the collimator rotation control unit 16. As can be seen from FIG. 8, in the collimator 3a after rotation, the movement direction of the pair of leaves 3b coincides with the body axis direction A of the subject M, and the movement direction of the other pair of leaves 3b is that of the subject M. It corresponds to the body side direction S.

<Acquisition of C-arm rotation data>
The collimator rotation control unit 16 acquires C-arm rotation data representing the rotation strength and rotation direction of the C-arm 7 from the C-arm rotation mechanism 21. The collimator rotation control unit 16 operates based on the C-arm rotation data. For example, it is assumed that the C-arm rotation mechanism 21 operates to rotate the C-arm 7 by 45 °. Then, the C-arm rotation mechanism 21 outputs C-arm rotation data indicating this operation to the collimator rotation control unit 16. Then, the collimator rotation control unit 16 operates to rotate the collimator 3a by −45 ° based on the C-arm rotation data.

  As described above, the collimator rotation control unit 16 rotates the collimator 3a in the direction opposite to the direction in which the imaging visual field R is inclined in accordance with the imaging visual field R being inclined with respect to the subject M as the C arm 7 rotates. Thus, the collimator rotating mechanism 15 is controlled to maintain the orientation of the imaging visual field R with respect to the subject M.

  The operation of the collimator rotating mechanism 15 as described above is performed when the direction holding button of the detector attached operation unit 31 is pressed, and the collimator rotation control unit 16 releases the pressing of the direction holding button. In the state, the operation described later is not performed. The surgeon can select whether to operate the collimator rotating mechanism 15 through the direction holding button.

<Operation of Image Generation Unit>
The image generation unit 11 generates an image based on the detection signal output from the FPD 4. The image generated at this time is referred to as an original image P0. The original image P0 is a rectangle having the same shape as the detection surface for detecting the X-rays of the FPD 4, and is a mapping of the X-ray intensity detected on the detection surface. The image generation unit 11 corresponds to an image generation unit of the present invention.

<Operation of image rotation unit>
Next, the image rotation unit 12 will be described. The image rotation unit 12 receives the image generated by the image generation unit 11 and performs image rotation processing. The image rotating unit 12 rotates a pattern reflected in the image with respect to the four sides of the rectangular image around the center point of the image. For example, if the image rotation unit 12 rotates the image by 90 ° clockwise with respect to the image in which the upward arrow is reflected, the image in which the right arrow is reflected is output from the image rotation unit 12. It will be. The rotation intensity of the image rotation unit 12 is determined by the rotation angle of the C arm 7.

  The actual operation of the image rotation unit 12 will be described. For example, assume that the original image P0 is as shown on the left side of FIG. The subject M is reflected in the original image P0 obtained at this time. The reason why only a part of the subject M is reflected in the original image P0 is that the X-ray irradiation range is limited by the collimator 3a. This X-ray irradiation range is a range in which the subject M is imaged, and is also an imaging visual field R.

  The reason why the subject M is reflected in the original image P0 in this way is actually that the FPD 4 is inclined with respect to the subject M as the C arm 7 shown in FIG. 3 rotates around the virtual circle VC. It is. When the FPD 4 is rotated along the virtual circle VC shown in FIG. 3, the FPD 4 is inclined with respect to the subject M. When shooting is performed with the FPD 4 tilted, shooting is performed with the subject tilted obliquely with respect to the FPD 4. The original image P0 photographed in such a state is a photograph of the subject M tilted with respect to the four sides of the original image P0. The right side of FIG. 9 represents the positional relationship between the original image P0 and the subject M when imaging is performed with the FPD 4 tilted.

  The image rotation unit 12 appropriately performs image rotation processing on the original image P0 as the C arm 7 rotates, and generates a rotated image P1. The left side of FIG. 10 represents the rotated image P1 at this time. As can be seen from FIG. 10, in the rotated image P1 after the rotation process, the subject M is reflected in the image so that the body axis direction A of the subject M coincides with the vertical direction of the image. The right side of FIG. 10 represents the positional relationship between the rotated image P1 and the subject M.

<Acquisition of C-arm rotation data>
The image rotation unit 12 acquires C-arm rotation data representing the rotation intensity and rotation direction of the C-arm 7 from the C-arm rotation mechanism 21. The image rotation unit 12 operates based on the C-arm rotation data. For example, it is assumed that the C-arm rotation mechanism 21 operates to rotate the C-arm 7 by 45 °. Then, the C arm rotation mechanism 21 outputs C arm rotation data indicating this operation to the image rotation unit 12. Then, the image rotation unit 12 adds a rotation process that rotates the original image P0 by 45 ° based on the C-arm rotation data. When the C-arm 7 is rotated by 45 °, the subject image shown in the image tends to rotate by −45 ° with respect to the image. However, the rotation of the subject image is erased by the image rotation unit 12. That is, the image rotation unit 12 rotates the original image P0 so as to follow the inclination of the subject image, and holds the orientation of the image with respect to the subject M.

  The operation of the image rotation unit 12 as described above is performed when the direction holding button of the detector attached operation unit 31 is pressed, and the image rotation unit 12 is in a state in which the direction holding button is released. Does not perform the operation described later. The surgeon can select whether or not to operate the image rotation unit 12 through the direction holding button.

<Other configuration of X-ray imaging apparatus>
The X-ray tube controller 6 (see FIG. 1) is provided for the purpose of controlling the X-ray tube 3 with a predetermined tube current, tube voltage, and pulse width. When X-rays are emitted from the X-ray tube 3 under the control of the X-ray tube control unit 6, the X-rays pass through the subject M and enter the detection surface of the FPD 4. The FPD 4 detects the incident X-ray and generates a detection signal. This detection signal is sent to the image generation unit 11 (see FIG. 1), where an image in which the projection image of the subject M is reflected is generated.

  The detector rotation unit 17 and the detector rotation control unit 18 are configured to rotate the detector with respect to the C arm 7. In the first embodiment, this configuration is not particularly required. These configurations will be described in detail in the second embodiment. The detector rotation control unit 18 corresponds to the detector rotation control means of the present invention.

  The console 26 (see FIG. 1) is provided for the purpose of inputting an instruction such as start of X-ray irradiation by the operator. Moreover, the main control part 34 (refer FIG. 1) is provided in order to control each control part comprehensively. The main control unit 34 is constituted by a CPU, and realizes the X-ray tube control unit 6 and each unit by executing various programs. Further, each of the above-described units may be divided and executed by an arithmetic device that takes charge of them. The storage unit 28 (see FIG. 1) stores all parameters relating to control of the X-ray imaging apparatus 1 such as parameters used for image processing. The storage unit 28 corresponds to the storage unit of the present invention.

<Operation of X-ray imaging apparatus>
Next, the operation of the X-ray imaging apparatus will be described with reference to FIG. In order to capture a fluoroscopic image of the subject M with the X-ray imaging apparatus according to the present invention, first, the subject M is placed on the top 2. At this time, the C-arm 7 is moved in advance so as to be separated from the top 2 from the short direction of the top 2 so that the C-arm 7 of the apparatus does not interfere with the subject M. The movement of the C-arm 7 is actually realized by moving the carriage 23 (subject placement step S1).

  FIG. 12 shows a state in which the C arm 7 is moved to the subject side after the subject M is placed on the top 2. In this description of the operation, as shown in FIG. 12, the C arm 7 is moved in the body side direction S of the subject M by the carriage 23 and approaches the subject M to perform imaging. Accordingly, it is assumed that the carriage 23 does not move in the body axis direction A of the subject M during the imaging operation.

<Shooting position adjustment step S2>
Next, the operator operates the lever 9 of the detector attached operation unit 31 to move the X-ray tube 3 and the FPD 4 with respect to the subject M. In this way, the operator moves the X-ray tube 3 and the FPD 4 to the region of interest of the subject M. Then, the surgeon adjusts the field of view R at the time of imaging by adjusting the opening of the collimator 3a attached to the X-ray tube 3.

<Inclination lock step S3>
When the adjustment of the photographing position is completed, the surgeon presses the lock button of the detector attached operation unit 31 and instructs the apparatus to lock the tilt. At this time, the image rotation unit 12 and the collimator rotation control unit 16 operate in accordance with the rotation of the C arm 7 described with reference to FIG.

<Shooting position fine adjustment step S4>
At this time, it is assumed that the imaging visual field R needs to be moved from the position R1 to the position R2 on the left side of FIG. That is, it is assumed that it is necessary to translate the imaging visual field R in the longitudinal direction of the top 2 (the body axis direction of the subject M) while maintaining the state in which the imaging visual field R is not inclined with respect to the top 2.

  The surgeon moves the lever 9 in the longitudinal direction of the top 2 to move the imaging field of view R from the position R1 to the position R2. At this time, the X-ray tube 3 and the FPD 4 have moved in the longitudinal direction of the top plate 2.

  How to realize the movement of the X-ray tube 3 and the FPD 4 will be described. Since the X-ray tube 3 and the FPD 4 are to be moved in the longitudinal direction of the top plate 2, it may be considered that the carriage 23 simply moves in the longitudinal direction of the top plate 2, but this is not the case. The moving direction of the carriage 23 is locked in the body side direction S of the subject M at the stage of the subject placing step S1. Therefore, in this step, the carriage 23 cannot be moved in the longitudinal direction of the top 2 (the body axis direction of the subject M).

  Therefore, the movement of the X-ray tube 3 and the FPD 4 is realized by combining the rotation of the C arm 7 shown on the right side of FIG. 13 and the movement of the carriage 23 in the body side direction S shown on the right side of FIG. That is, when the C-arm 7 is rotated by the method described with reference to FIG. 3 from the initial state on the left side of FIG. 13, the X-ray tube 3 and the FPD 4 move in the longitudinal direction and the short direction of the top plate 2. Then, the imaging visual field R moves from the position R1 to the position R1a as shown on the right side of FIG. In this way, the field of view R can be moved to the position R2 in the longitudinal direction of the top 2 by rotating the C-arm 7. However, along with this movement, the field of view R has moved undesirably in the short direction of the top 2.

  The C arm 7 is moved in the short direction of the top plate 2 by the carriage 23 for the purpose of correcting the positional deviation of the top plate 2 in the short direction. That is, when the C-arm 7 is moved in the short direction of the top plate 2 from the state on the right side of FIG. 13, the X-ray tube 3 and the FPD 4 are moved in the short direction of the top plate 2. Then, the photographing visual field R moves from the position R1a to the position R1b as shown on the left side of FIG. In this way, the field of view R can be moved to the position R2 in the short direction of the top 2.

  By the above movement, the photographing visual field R is moved to the position R1b. Actually, the rotation of the C-arm 7 and the movement of the carriage 23 are performed simultaneously. Therefore, the field of view R at the position of R1 moves directly to the position of R1b without passing through R1a. However, the movement of the field of view R is not completed at this point. That is, in this state, the field of view R is inclined with respect to the top 2 as the C arm 7 rotates.

<Shooting field rotation step S5>
Therefore, the collimator rotation control unit 16 operates to rotate the collimator 3a with respect to the top plate 2. Thereby, the inclination of the imaging field of view R with respect to the top 2 caused by the rotation of the C arm 7 is eliminated. By this operation, the photographing visual field R is rotated from the position R1b shown in the right side of FIG. 14 to the position R2. In this way, the field of view R is moved to a position desired by the operator, and preparation for photographing is completed.

<Photographing start step S6, image acquisition step S7>
When the operator gives an X-ray irradiation instruction to the X-ray imaging apparatus 1 through a console provided in a separate room isolated from the examination room, the X-ray tube control unit 6 controls the X-ray tube 3 to Irradiate the line. The FPD 4 detects X-rays that have passed through the subject M, and sends a detection signal to the image generation unit 11. The image generation unit 11 generates the original image P0 based on the detection signal.

<Image Rotation Step S8>
The original image P0 generated by the image generation unit 11 is sent to the image rotation unit 12. The image rotation unit 12 rotates the subject image obliquely reflected with respect to the four sides of the original image P0 so that the vertical direction of the image and the body axis direction A of the subject M and the horizontal direction of the image are the subject M. In the body side direction S. The object image of the original image P0 generated by the image generation unit 11 is rotated because the FPD 4 is inclined with respect to the top board 2 as the C arm 7 rotates.

  The rotation image P1 generated by the image rotation unit 12 is displayed on the display unit 32, and the operation of the X-ray imaging apparatus 1 according to the first embodiment is completed.

  As described above, the X-ray imaging apparatus according to the present invention includes the C-arm 7, the X-ray tube 3, the FPD 4, the collimator 3 a and the collimator rotating mechanism 15 that are instructed to the C-arm 7. The C-arm 7 can rotate with respect to the subject M about the vertical direction as a rotation axis. When the C-arm 7 is rotated, the collimator 3a is rotated with respect to the subject M, and the field of view R defined by the collimator 3a is inclined with respect to the subject M. Therefore, the collimator rotation control unit 16 according to the present invention causes the collimator 3a to move in a direction opposite to the direction in which the imaging visual field R is tilted as the imaging visual field R is tilted with respect to the subject M as the C arm 7 rotates. The collimator rotating mechanism 15 is controlled so as to rotate, and the orientation of the imaging visual field R with respect to the subject M is maintained. In this way, regardless of the rotation of the C-arm 7, the orientation of the imaging field of view R with respect to the subject M is always constant, and the operator is free from the complicated operation of manually rotating the imaging field of view R. Further, the present invention includes a detector-attached operation unit 31 that selects whether or not the collimator 3a is automatically rotated. Thereby, the surgeon can freely select the operation according to the present invention and the operation of the conventional apparatus.

  In the above configuration, when the C arm 7 is rotated, the detector rotates with respect to the subject M, and the orientation of the image defined by the detector is inclined with respect to the subject M. Therefore, the image rotation unit 12 of the present invention adjusts the inclination of the subject image as the subject image reflected in the image generated by the image generation unit 11 is tilted with respect to the image as the C arm 7 rotates. The image is rotated so as to follow, and the orientation of the image with respect to the subject M is maintained. In this way, the orientation of the image with respect to the subject M is always constant regardless of the rotation of the C-arm 7, and the operator is free from the complicated operation of manual rotation of the FPD 4. In addition, the present invention includes a detector-attached operation unit 31 that selects whether to automatically rotate the FPD 4. Thereby, the surgeon can freely select the operation according to the present invention and the operation of the conventional apparatus.

  Next, the configuration of the X-ray imaging apparatus according to Embodiment 2 will be described. The X-ray imaging apparatus according to the second embodiment is substantially the same as the configuration of the first embodiment described with reference to FIG. Therefore, the description of the configuration common between the first embodiment and the second embodiment is omitted.

  The second embodiment is different from the first embodiment in that the image rotation unit 12 is not necessarily required and the detector for detecting X-rays is an I.D. The three points are that it is an I tube (image intensifier) and that the detector rotation mechanism 17 and the detector rotation control unit 18 are essential. Hereinafter, the rotation of the detector, which is the most characteristic part of the second embodiment, will be described. I. The I tube 4a corresponds to the detector of the present invention, and the detector rotating mechanism 17 corresponds to the detector rotating means of the present invention.

<I. Rotation control of I tube (detector)>
The left side of FIG. It is a perspective view explaining the structure of the I pipe | tube 4a. As shown in FIG. The I tube 4 a has a cylindrical shape and has a detection surface 4 b that detects X-rays at a position facing the X-ray tube 3. I. The I tube 4a is connected to the I.D. The detector can be rotated with respect to the C arm 7 around a detector rotation axis AXd extending from the I tube 4a in a direction penetrating the X-ray tube 3. The detector rotation axis AXd is orthogonal to the detection surface 4b and passes through the center of the detection surface 4b. I. The detector rotation mechanism 17 drives the rotation of the I tube 4a, and the detector rotation control unit 18 is provided for the purpose of controlling the detector rotation mechanism 17. Note that the right side of FIG. The state where the I tube 4a is rotated around the detector rotation axis AXd with respect to the C arm 7 is shown. This figure is shown in FIG. It is a figure at the time of looking down at the I pipe 4a in the vertical direction. It is hidden by the I tube 4a. The detector rotation mechanism 17 is an I.I. Centered on a detector rotation axis AXd orthogonal to the detection surface for detecting X-rays in the I tube 4a. The I tube 4 a is rotated with respect to the C arm 7. I. Since the I tube 4a is positioned on the upper side in the vertical direction and the X-ray tube 3 is positioned on the lower side in the vertical direction, the detector rotation axis AXd is along the vertical direction.

  The actual operation of the detector rotation control unit 18 will be described. For example, I.I. Assume that the image generation range, which is the range for generating an image in the I tube 4a, is as shown by the broken line on the left side of FIG. Since the image is rectangular, the image generation range is also rectangular. In the image generation range in the case of the left side of FIG. 16, the four sides are not along the body axis and the body side of the subject M, and are inclined with respect to the subject M.

  The fact that the subject M appears to be tilted in the image generation range in this way is actually the fact that the I.M. This is because the I tube 4a is inclined with respect to the subject M. Along the virtual circle VC shown in FIG. When the I tube 4a is rotated, the I.D. The I tube 4a is inclined with respect to the subject M. I. When shooting is performed with the I tube 4a tilted, the I.D. The photographing is performed with the subject tilted obliquely with respect to the I tube 4a. The original image P0 photographed in such a state is a photograph of the subject M tilted with respect to the four sides of the original image P0.

  The detector rotation control unit 18 moves the I.D. The I tube 4a is appropriately rotated. The right side of FIG. The state after the I tube 4a is rotated is shown. As can be seen from the right side of FIG. 16, in the image generation range after rotation, the body axis direction A of the subject M coincides with the vertical direction of the image.

<Acquisition of C-arm rotation data>
The detector rotation control unit 18 acquires C-arm rotation data representing the rotation intensity and the rotation direction of the C-arm 7 from the C-arm rotation mechanism 21. The detector rotation control unit 18 operates based on the C-arm rotation data. For example, it is assumed that the C-arm rotation mechanism 21 operates to rotate the C-arm 7 by 45 °. Then, the C arm rotation mechanism 21 outputs C arm rotation data indicating this operation to the detector rotation control unit 18. Then, the detector rotation control unit 18 performs I.D. based on the C-arm rotation data. A rotation process is performed so that the I tube 4a is rotated by -45 °. When the C-arm 7 is rotated by 45 °, the subject image shown in the image tends to rotate by −45 ° with respect to the image. However, the rotation of the subject image is erased by the detector rotation control unit 18. That is, the detector rotation control unit 18 adjusts the I.D. So that the I tube 4a rotates following. The direction of the image with respect to the subject M is maintained by controlling the detector rotating mechanism 17 for the I tube 4a.

  The operation of the detector rotation mechanism 17 as described above is performed when the direction holding button of the detector attached operation unit 31 is pressed, and the detector rotation control unit 18 releases the pressing of the direction holding button. In the state, the operation described later is not performed. The surgeon can select whether to operate the detector rotation mechanism 17 through the direction holding button.

<Operation of X-ray imaging apparatus>
Next, the operation of the X-ray imaging apparatus will be described with reference to FIG. In order to capture a fluoroscopic image of the subject M with the X-ray imaging apparatus according to the present invention, the subject placement step S1, the imaging position adjustment step S2, and the tilt lock step S3 described in the first embodiment are performed.

  At this time, it is assumed that the imaging visual field R needs to be moved from the position R1 to the position R2 on the left side of FIG. Then, the operator moves the imaging field of view R in the manner described with reference to FIGS. 13 and 14 (imaging position fine adjustment step S4).

  Then, the collimator rotation control unit 16 operates to rotate the collimator 3a with respect to the top plate 2 (shooting field rotation step S5). Details of this operation have already been described with reference to FIGS.

<Detector rotation step T6>
Subsequent operations are unique to the second embodiment. That is, when the rotation of the imaging field of view R is completed, the detector rotation control unit 18 operates this time. The I tube 4a is rotated with respect to the top plate 2. Thereby, the inclination of the image generation range with respect to the top plate 2 caused by the rotation of the C arm 7 is eliminated. In this way, the field of view R is moved to a position desired by the operator, and preparation for photographing is completed.

<Photographing start step T7, image acquisition step T8>
When the operator gives an X-ray irradiation instruction to the X-ray imaging apparatus 1 through a console provided in a separate room isolated from the examination room, the X-ray tube control unit 6 controls the X-ray tube 3 to Irradiate the line. I. The I tube 4 a detects X-rays that have passed through the subject M, and sends a detection signal to the image generation unit 11. The image generation unit 11 generates the original image P0 based on the detection signal.

  The original image P0 generated by the image rotation unit 12 is displayed on the display unit 32, and the operation of the X-ray imaging apparatus 1 according to the first embodiment is completed.

  As described above, the configuration of Example 2 is simpler for the operator to operate. That is, when the C-arm 7 is rotated, the detector rotates with respect to the subject M, and the orientation of the image defined by the detector is inclined with respect to the subject M. Therefore, the image rotation unit 12 of the present invention adjusts the inclination of the subject image as the subject image reflected in the image generated by the image generation unit 11 is tilted with respect to the image as the C arm 7 rotates. The image is rotated so as to follow, and the orientation of the image with respect to the subject M is maintained. In this way, the orientation of the image with respect to the subject M is always constant regardless of the rotation of the C-arm 7, and the operator is free from the complicated operation of manual rotation of the FPD 4. In addition, the present invention includes a detector-attached operation unit 31 that selects whether to automatically rotate the FPD 4. Thereby, the surgeon can freely select the operation according to the present invention and the operation of the conventional apparatus.

  The present invention is not limited to the above-described configuration, and can be modified as follows.

  (1) According to the above-described configuration, the C-arm rotation data is transmitted from the C-arm rotation mechanism 21 to each unit, but the present invention is not limited to this configuration. For example, the C-arm rotation data may be generated by a potentiometer or encoder attached to the C-arm 7.

  (2) According to the above configuration, the radiation detector of the first embodiment is an FPD, and the radiation detector of the second embodiment is an I.D. The radiation detector of Example 1 was the I. tube. It may be an I tube, and the radiation detector of Example 2 may be an FPD.

  (3) Although the embodiment described above is a medical device, the present invention can also be applied to industrial and nuclear devices.

  (4) X-rays referred to in the above-described embodiments are an example of radiation in the present invention. Therefore, the present invention can be applied to radiation other than X-rays.

3 X-ray tube (radiation source)
3a Collimator 4 FPD (detection means)
4a I.E. I tube (detection means)
7 C-arm (arm)
8 Prop 11 Image generator (image generator)
12 Image rotation unit (image rotation means)
15 Collimator rotation mechanism (collimator rotation means)
16 Collimator rotation control unit (collimator rotation control means)
17 Detector rotation mechanism (detector rotation means)
18 Detector rotation control unit (detector rotation control means)
21 Arm rotation mechanism (arm rotation means)
22 Arm rotation control unit (arm rotation control means)
23 cart (arm moving means)
24 cart movement control unit (arm movement control means)
31 Operation unit attached to detector (input means)

Claims (7)

A radiation source that emits radiation;
Detection means for detecting radiation transmitted through the subject;
Image generating means for generating an image based on a detection signal output from the detecting means;
Input means for inputting the instructions of the surgeon;
A collimator that changes the field of view by limiting the spread of radiation emitted from the radiation source;
Collimator rotation means for rotating the collimator with respect to the radiation source about a collimator rotation axis extending in the radiation irradiation direction;
An arm that supports the radiation source, the detection means, the collimator, and the collimator rotation means;
A column supporting the arm;
Arm rotating means for rotating the imaging field of view with respect to the subject by rotating the arm and each of the devices supported by the arm around an arm rotation axis extending in the vertical direction and penetrating the support;
Arm rotation control means for controlling the arm rotation means in accordance with an operator's instruction input to the input means;
After the direction holding instruction is input to the input unit, the collimator rotates in a direction opposite to the direction in which the imaging field of view is tilted as the imaging field of view is tilted with respect to the subject as the arm rotates. And a collimator rotation control means for controlling the collimator rotation means so as to maintain the orientation of the imaging field of view with respect to the subject. The radiographic apparatus according to claim 1,
Detector rotation means for rotating the detection means relative to the arm about a detector rotation axis orthogonal to a detection surface for detecting radiation in the detection means;
After the direction holding instruction is input to the input unit, the subject image reflected in the image generated by the image generation unit with the rotation of the arm is inclined with respect to the image. Radiation imaging apparatus comprising: detector rotation control means for controlling the detector rotation means so that the detector follows the inclination of the image and rotates to maintain the orientation of the image with respect to the subject. . The radiographic apparatus according to claim 1,
After the direction holding instruction is input to the input unit, the subject image reflected in the image generated by the image generation unit with the rotation of the arm is inclined with respect to the image. A radiation imaging apparatus, comprising: an image rotation unit configured to rotate the image so as to follow the inclination of the image to maintain the orientation of the image with respect to the subject. The radiographic apparatus according to any one of claims 1 to 3,
An arm moving means for moving the arm and each device supported by the arm in a state of maintaining a relative position with each other by moving the column in a horizontal direction perpendicular to the vertical direction;
A radiation imaging apparatus comprising: arm movement control means for controlling the arm movement means in accordance with an operator's instruction input to the input means. The radiation imaging apparatus according to any one of claims 1 to 4,
A radiation imaging apparatus, wherein the arm is a C-arm. The radiographic apparatus according to any one of claims 1 to 5,
A radiation imaging apparatus, wherein the input means is disposed in the detection means. The radiographic apparatus according to any one of claims 1 to 6,
The radiographic apparatus according to claim 1, wherein the input means is provided with a lock button for inputting a direction holding instruction.

Images