JP2005329033A - X-ray diagnosys apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem, that is, a deviation of the orientation of a photographing system from the center line of a top plate supporting a subject, that occurs when a photographing system holding member for holding an X-ray tube and a two-dimensional X-ray detector opposingly is arranged in a direction that crosses the center line of the top plate diagonally. <P>SOLUTION: When a C-arm 4 is arranged so that the C-arm crosses the center line 1A of the top plate 1 aslant at a crossing angle of θ, a photographing system rotating mechanism 16 rotates a radiation cone and the two-dimensional X-ray detector 3 at the same angle in the same direction centering an X-ray irradiation axis XA on the basis of the crossing angle θ between the C-arm 4 and the center line of the top plate 1. The deviation of the orientation of the photographing system from the center line 1A of the top plate 1 is thus prevented. In addition, when solving the deviation of the orientation of the photographing system, the whole X-ray tube 2 is not rotated, but only a part of the X-ray tube 2, that is, the radiation cone, is rotated. By doing so, difficulties for rotating the whole of the large and heavy X-ray tube 2 is avoided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention mounts a subject when an imaging system holding member holding an X-ray tube for X-ray irradiation and a two-dimensional X-ray detector for X-ray detection in an opposed arrangement is viewed in plan view. The present invention relates to an X-ray diagnostic apparatus that can be oriented obliquely at a crossing angle θ with respect to the center line of the top board, and in particular, the ceiling that occurs when the imaging system holding member is oriented obliquely to the center line of the top board. The present invention relates to a technique for eliminating the deviation of the orientation of the imaging system with respect to the center line of the plate in an appropriate manner.

  In recent years, X-ray fluoroscopic apparatuses shown in FIGS. 9 and 10 are used for diagnosis and treatment of the heart, blood vessels, and the like in medical institutions such as hospitals.

  The X-ray fluoroscopic apparatus of FIG. 9 includes a top plate 61 on which a subject (not shown) is placed, an X-ray tube 62 that irradiates a subject on the top plate 61 with an X-ray beam, A two-dimensional X-ray detector 63 that detects X-rays transmitted through the subject above, and a C-type arm (imaging system holding member) in which the X-ray tube 62 and the two-dimensional X-ray detector 63 are held facing each other. 64 and a ceiling-suspended base member 65 that supports the C-type arm 64 in a direction in which the C-type arm 64 coincides with the center line 61A of the top plate 61 when viewed in plan. Assuming that the X-ray beam irradiated by the X-ray tube 62 has a square cross-sectional shape, the two-dimensional X-ray detector 63 outputs transmitted X-rays in a square X-ray detection area corresponding to the cross-sectional shape of the X-ray beam. Will be detected.

  In the case of the X-ray fluoroscopic apparatus of FIG. 9, the C-arm is moved along the bending of the arm in the longitudinal direction of the C-arm 64 by a C-arm moving mechanism (not shown) provided on the base member 65. The X-ray tube 62 irradiates the subject with X-rays while performing a slide movement in which the C-type arm 64 moves, or a horizontal orbital rotation in which the C-type arm 64 rotates around a horizontal line horizontally traversing the C-type arm 64. At the same time, an X-ray fluoroscopic image is acquired at the subsequent stage of the two-dimensional X-ray detector 63 in accordance with the X-ray detection signal output from the two-dimensional X-ray detector 63 along with the X-ray irradiation (see Patent Document 1). .

  However, in the case of the X-ray fluoroscopic apparatus of FIG. 9, when the operator treats the subject on the top plate 61 while performing fluoroscopy or the caregiver cares for the subject, There is a problem in that the C-shaped arm 64 supported in a state of covering the upper subject obstructs treatment and care.

Therefore, in the case of the X-ray fluoroscopic apparatus of FIG. 10, when viewed in plan, the C-type arm 64 is arranged so that the C-type arm 64 obliquely intersects the center line 61 </ b> A of the top plate 61. 66c is supported by a floor-mounted base member 66 having a three-axis rotating structure that can be rotated in the horizontal direction around the center of rotation, and the subject on the top plate 61 is treated while being seen through X-rays, or is being cared for. The C-shaped arm 64 is not hindered during the process (see Patent Document 2).
JP 2001-95790 A (pages 3 to 6, FIG. 1) JP 2003-250784 A (pages 5 to 9, FIGS. 1 and 6)

  However, in the X-ray fluoroscopic imaging apparatus of FIG. 10, the orientation of the imaging system with respect to the center line 61 </ b> A of the top plate 61 is shifted when the C-shaped arm 64 is obliquely intersected with the center line 61 </ b> A of the top plate 61. There is a problem of end.

  That is, when the C-shaped arm 64 is inclined obliquely with respect to the center line 61A of the top plate 61, the X-ray detection area 63a of the two-dimensional X-ray detector 63 is also shown in FIG. Since the orientation changes from the direction parallel to the center line 61A of the top board 61 to the oblique direction, the imaging position of the subject corresponding to the X-ray detection area 63a changes. As a result, the acquired X-ray fluoroscopic image is inclined with respect to the original image.

  However, if the two-dimensional X-ray detector 63 is rotated in the opposite direction about the X-ray irradiation axis as the intersection angle θ of the C-shaped arm 64 with respect to the center line 61A of the top plate 61, as shown in FIG. As indicated by a two-dot chain line, the X-ray detection area 63a of the two-dimensional X-ray detector 63 returns from the oblique direction to the original parallel direction with respect to the center line 61A of the top plate 61, and is acquired. The orientation of the image is also restored.

  However, when the C-shaped arm 64 is inclined obliquely with respect to the center line 61A of the top plate 61, the X-ray beam 62a of the X-ray tube 62 is also shown in FIG. The direction changes from the direction parallel to the center line 61A of 61 to an oblique direction. Therefore, as described above, the two-dimensional X-ray detector 63 is rotated in the reverse direction with the X-ray irradiation axis as the rotation center, so that the X-ray detection area 63a of the two-dimensional X-ray detector 63 becomes the center line of the top plate 61. When returning to the original parallel direction with respect to 61A, as shown in FIG. 13, there is an intersection between the X-ray beam 62a of the X-ray tube 62 and the X-ray detection area 63a of the two-dimensional X-ray detector 63. Deviation of the angle θ occurs, and transmitted X-rays are not detected at the corners of the X-ray detection area 63a of the two-dimensional X-ray detector 63, resulting in an X-ray fluoroscopic image lacking corners.

  However, if the entire X-ray tube 62 is rotated in an opposite direction around the X-ray irradiation axis as much as the intersection angle θ of the C-arm 64 with respect to the center line 61A of the top plate 61, a two-dot chain line is shown in FIG. If the X-ray beam 62a is also returned from the oblique direction to the original parallel direction with respect to the center line 61A of the top plate 61, the X-ray beam 62a of the X-ray tube 62 and the two-dimensional X-ray detection are detected. The gap between the X-ray detection areas 63a of the detector 63 is eliminated, and transmitted X-rays are detected even at the corners of the X-ray detection area 63a, so that an X-ray fluoroscopic image having no corners can be acquired.

  However, it is extremely difficult to employ a configuration in which the entire X-ray tube 62 having a considerable weight and size is rotated at a narrow end of the C-arm 64. Therefore, the entire X-ray tube 62 is rotated in the reverse direction with the X-ray irradiation axis as the rotation center, so that the X-ray beam 62a also changes from the oblique direction to the original parallel direction with respect to the center line 61A of the top plate 61. The policy to return cannot be a realistic solution.

  The present invention has been made in view of such circumstances, and holds an imaging system that holds an X-ray tube for X-ray irradiation and a two-dimensional X-ray detector for X-ray detection in an opposed arrangement. X-rays that can eliminate the deviation of the orientation of the imaging system with respect to the center line of the top plate that occurs when the member is oriented obliquely to the center line of the top plate on which the subject is placed. An object is to provide a diagnostic apparatus.

  In order to achieve such an object, the present invention has the following configuration.

  That is, the X-ray diagnostic apparatus according to the first aspect of the present invention includes a top plate on which the subject is placed, and a radiation cone that limits the radiation X-rays to form a non-circular cross-sectional X-ray beam. An X-ray tube for X-ray irradiation attached to the radiation port and an X-ray for detecting X-rays transmitted through the subject on the top plate in an X-ray detection area corresponding to the cross-sectional shape of the X-ray beam An X-ray irradiation axis passing through the focal point of the X-ray tube through the X-ray tube and the two-dimensional X-ray detector passes through the center of the X-ray detection surface of the two-dimensional X-ray detector. And an imaging system holding member that holds the X-ray tube and the two-dimensional X-ray detector facing each other, and an imaging system in which the top plate is positioned between the X-ray tube and the two-dimensional X-ray detector. When holding the holding member and in plan view, the imaging system holding member should be oriented obliquely at an intersecting angle θ with respect to the center line of the top plate An imaging system rotation drive means for rotating the radiation support cone and the two-dimensional X-ray detector around the X-ray irradiation axis, and an intersection angle θ with respect to the center line of the top plate of the imaging system holding member An imaging system in which a radiation cone and a two-dimensional X-ray detector for restricting radiation X-rays to form a non-circular cross-sectional X-ray beam are rotated in the same direction and at the same angle with the X-ray irradiation axis as the rotation center Control is performed to the imaging system rotation drive means to eliminate the deviation of the orientation of the imaging system with respect to the center line of the top plate that occurs when the holding member is obliquely intersected with the center line of the top plate at an intersection angle θ. An imaging system rotation control means is provided.

  [Operation / Effect] In the case of X-ray imaging by the X-ray diagnostic apparatus according to the first aspect of the present invention, the top plate is placed between the X-ray tube held in an opposed state by the imaging system holding member and the two-dimensional X-ray detector. The X-ray image is acquired from the two-dimensional X-ray detector when the X-ray beam is irradiated from the X-ray tube to the object on the top plate. X-ray detection signal is output, and X-ray imaging proceeds.

  On the other hand, in the case of the X-ray diagnostic apparatus according to the first aspect of the present invention, the imaging system holding member that holds the X-ray tube and the two-dimensional X-ray detector in an opposed state at the time of X-ray imaging is flat by the support base. When the imaging system holding member is obliquely crossed at an appropriate crossing angle θ with respect to the center line of the top board when viewed, the imaging system holding member covers the subject on the top board. Therefore, in parallel with X-ray imaging, the surgeon and caregiver can perform treatment and care without being interrupted by the imaging system holding member.

  On the other hand, in the case of the X-ray diagnostic apparatus according to the first aspect of the present invention, the imaging system with respect to the center line of the top plate that occurs when the imaging system holding member is obliquely crossed at the crossing angle θ with respect to the center line of the top plate. As the imaging system rotation control means performs control for eliminating the orientation deviation with respect to the imaging system rotation driving means, the imaging system rotation driving means is based on the intersection angle θ with respect to the center line of the imaging system holding member. Since the radiation cone and the two-dimensional X-ray detector that restricts the radiation X-rays to prepare a non-circular cross-sectional X-ray beam are rotated in the same direction and at the same angle with the X-ray irradiation axis as the rotation center, the top plate Deviations in the orientation of the imaging system with respect to the center line of can be avoided.

  As a result, the orientation of the X-ray detection area of the two-dimensional X-ray detector remains the same, and a situation in which the finally acquired X-ray image is inclined is avoided. The direction of the X-ray beam having the cross-sectional shape remains unchanged, and a situation in which a part of the finally acquired X-ray image is missing is also avoided.

  Furthermore, in the X-ray diagnostic apparatus according to the first aspect of the present invention, the imaging system with respect to the center line of the top plate that occurs when the imaging system holding member is obliquely intersected with the center line of the top plate at an intersection angle θ. Rather than rotating the entire X-ray tube when eliminating the misalignment, only a part of the X-ray tube called the radiation cone that adjusts the non-circular cross-sectional shape of the X-ray beam is rotated. There is no difficulty associated with rotating the entire X-ray tube with weight and size.

  According to a second aspect of the present invention, in the X-ray diagnostic apparatus according to the first aspect, in the X-ray tube, the radiation cone limits the radiated X-ray to arrange the X-ray beam having a rectangular cross section, In the two-dimensional X-ray detector, a rectangular X-ray detection area detects transmitted X-rays.

  [Operation / Effect] In the case of the apparatus of the invention of claim 2, the X-ray tube irradiates the subject with an X-ray beam having a rectangular cross section, and the two-dimensional X-ray detector is in the rectangular X-ray detection area. Since transmitted X-rays are detected, the finally acquired X-ray image is finished into a square shape such as a square or a rectangle which is one of standard image shapes.

  According to a third aspect of the present invention, in the X-ray diagnostic apparatus according to the first or second aspect, the X-ray tube has a collimator in front of the radiation cone, and the radiation cone and the collimator emit radiation X-rays. Is arranged into a non-circular cross-sectional X-ray beam, and the imaging system rotation drive means rotates the collimator around the X-ray irradiation axis as well as the imaging system rotation control means. With this control, the collimator can also be rotated by the same angle in the same direction as the radiation cone with the X-ray irradiation axis as the rotation center.

  [Operation / Effect] In the case of the device of the invention of claim 3, since the radiation X-rays are arranged into a non-circular cross-sectional X-ray beam by both the radiation cone and the collimator, the radiation X-rays can be converted only by the radiation cone. The degree of freedom in adjusting the cross-sectional shape of the X-ray beam is increased compared to the case of adjusting the X-ray beam to a non-circular cross-sectional shape. Further, when controlling the imaging system rotation driving means by the imaging system rotation control means, the collimator can also rotate the radiation cone and the two-dimensional X-ray detector in the same direction with the X-ray irradiation axis as the rotation center by the same angle. Control that eliminates the deviation of the orientation of the imaging system with respect to the center line of the top plate that occurs when the imaging system holding member is obliquely crossed at the intersection angle θ with respect to the center line of the top plate. Is not disturbed by the collimator.

  In the case of the X-ray diagnostic apparatus according to the first aspect of the present invention, the imaging system holding member holding the X-ray tube and the two-dimensional X-ray detector facing each other at the time of X-ray imaging is viewed in plan by the support base. In this case, when the imaging system holding member is obliquely crossed at an appropriate crossing angle θ with respect to the center line of the top plate, the degree to which the imaging system holding member covers the subject on the top plate is reduced. Therefore, in parallel with the X-ray imaging, the operator and the caregiver can perform the treatment and care without being obstructed by the imaging system holding member.

  In addition, the imaging system rotation control means performs control for eliminating the deviation of the orientation of the imaging system with respect to the center line of the top plate, which occurs when the imaging system holding member is obliquely intersected with the center line of the top plate at an intersection angle θ. The imaging system rotation driving means limits the radiation X-ray based on the crossing angle θ with respect to the center line of the top plate of the imaging system holding member as the imaging system rotation driving means performs the non-circular cross section. Since the radiation cone and the two-dimensional X-ray detector for adjusting the X-ray beam in the shape are rotated in the same direction by the same angle with the X-ray irradiation axis as the rotation center, a deviation in the orientation of the imaging system with respect to the center line of the top plate can be avoided. .

  Furthermore, the entire X-ray tube is used to eliminate the misalignment of the orientation of the imaging system with respect to the center line of the top plate, which occurs when the imaging system holding member is inclined obliquely with respect to the center line of the top plate at an intersection angle θ. Instead of rotating the X-ray tube, only a part of the X-ray tube called the radiation cone that adjusts the non-circular cross-sectional shape of the X-ray beam is rotated, so the entire X-ray tube with considerable weight and size is rotated. There is no difficulty like that.

  Therefore, according to the X-ray diagnostic apparatus of the present invention, the imaging system holding member that holds the X-ray tube for X-ray irradiation and the two-dimensional X-ray detector for X-ray detection in an opposed arrangement state is provided on the subject. The deviation of the orientation of the imaging system with respect to the center line of the top plate that occurs when the orientation of the top plate is obliquely intersected with the center line of the top plate can be eliminated.

  Embodiment 1 of the X-ray diagnostic apparatus according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram illustrating an overall configuration of a medical X-ray fluoroscopic apparatus according to the first embodiment, and FIG. 2 is a front view illustrating an imaging stand of the X-ray fluoroscopic apparatus according to the first embodiment.

  As shown in FIGS. 1 and 2, the X-ray fluoroscopic apparatus according to the first embodiment has an X-ray that irradiates X-rays on the top plate 1 on which the subject M is placed and the subject M on the top plate 1. An X-ray tube 2 for irradiation, a two-dimensional X-ray detector 3 for X-ray detection that detects X-rays transmitted through the subject M on the top 1, and an X-ray tube 2 and two-dimensional X-ray detection The X-ray irradiation axis XA passing through the focal point of the X-ray tube 2 passes through the center of the X-ray detection area of the two-dimensional X-ray detector 3 and the X-ray tube 2 and the two-dimensional X-ray detector 3 face each other. While supporting the C-type arm 4 with the C-type arm (imaging system holding member) 4 being held and the top plate 1 positioned between the X-ray tube 2 and the two-dimensional X-ray detector 3 A floor-mounted support base 5 is provided that can make the C-shaped arm 4 obliquely intersect with the center line 1A of the top plate 1 at an intersecting angle θ when viewed in plan.

  In the case of the apparatus of the first embodiment, in addition to the top plate moving mechanism 6 that moves the top plate 1 in a direction parallel to the center line 1A and in a direction perpendicular to the center line 1A, the top plate moving mechanism is provided. A top-plate movement control unit 7 that controls 6 is provided in the preceding stage, and the top-plate movement mechanism 6 moves the top plate 1 along the center line 1A according to the control of the top-plate movement control unit 7, and the subject M Can be set at a position suitable for X-ray imaging and treatment.

  As shown in FIGS. 2 to 3, the X-ray tube 2 for X-ray irradiation is radiated by a radiation cone 8 that limits the radiation X-ray to form a square (non-circular) cross-sectional X-ray beam 2a. The subject M is irradiated with the X-ray beam 2a with a tube voltage and a tube current according to the imaging conditions according to the control of the X-ray irradiation control unit 9 provided in the previous stage. As shown in FIG. 4, the radiation cone 8 has a square opening, restricts the radiation X-rays to prevent unnecessary X-ray exposure, etc. In addition, it exhibits a function of adjusting the X-ray beam 2a having a square (non-circular) cross-sectional shape.

  As shown in FIG. 5, the two-dimensional X-ray detector 3 includes a X-ray detection area 3a having the same square shape corresponding to the square cross-sectional shape of the X-ray beam 2a of the X-ray tube 2. X-rays transmitted through the specimen M are detected, and an X-ray detection signal for obtaining a digital X-ray fluoroscopic image is output. Specific examples of the two-dimensional X-ray detector 3 include a flat panel X-ray detector (FPD) and an image intensifier.

  A detection signal for obtaining a square X-ray fluoroscopic image corresponding to the square X-ray detection area 3a in accordance with the X-ray detection signal output from the two-dimensional X-ray detector 3 is provided at the subsequent stage of the two-dimensional X-ray detector 3. In addition to the display monitor 11 for displaying the X-ray fluoroscopic image acquired by the processing unit 10 and the detection signal processing unit 10 and the menu for operating the apparatus on the screen, commands and data necessary for execution of X-ray imaging are input. An operation unit 12 is provided.

  For example, in the case of digital subtraction angiography in which a contrast medium is injected into the blood vessel of the subject M and an X-ray fluoroscopic image in which only the blood vessel is captured is obtained, the detection signal processing unit 10 performs X before the contrast medium injection. A subtraction process for subtracting the fluoroscopic image (base image) and the X-ray fluoroscopic image (live image) after injection of the contrast agent is performed to obtain an X-ray fluoroscopic image showing only the blood vessels.

  In the case of the apparatus of the first embodiment, the C-type arm 4 is moved by the C-type arm moving mechanism 13 disposed on the support base 5 along the bending of the arm in the longitudinal direction of the C-type arm 4. It is configured such that it can move or rotate horizontally around the C-arm 4 with the horizontal line horizontally traversing the C-arm 4 as the center of rotation. As a result, the X-ray tube 2 and the two-dimensional X-ray detector 3 move around the subject M as the C-type arm 4 is slid by the C-type arm moving mechanism 13 and rotated horizontally. The X-ray fluoroscopic image can be acquired in accordance with the X-ray detection signal output from the two-dimensional X-ray detector 3 along with the X-ray irradiation.

  Furthermore, while the acquired X-ray fluoroscopic image is displayed on the display monitor 11 and observed, the subject may be treated or operated in parallel with the X-ray imaging. In the apparatus of the first embodiment, at this time, as shown in FIG. 1, the C-arm 4 is obliquely intersected with the center line 1A of the top plate 1 at an intersecting angle θ by the support base 5 when viewed in plan. It is configured so that it can be oriented.

  That is, in the apparatus according to the first embodiment, the support base 5 includes the base rotation drive mechanism 14 that rotates the support base 5 itself about the vertical axis XB as the rotation axis. In addition to rotating the support base 5 about the vertical axis XB, the C-arm 4 can be inclined obliquely at an intersecting angle θ with respect to the center line 1A of the top plate 1 in plan view. The crossing angle θ is changed by adjusting the rotation angle of the support base 5.

  As shown in FIG. 7, the base rotation drive mechanism 14 includes a motor 14A, an endless belt 14B that transmits the rotation of the motor 14A, and a gear box 14C that converts the rotation of the endless belt 14B into rotation about the vertical axis XB. A drive gear 14D that transmits rotation about the vertical axis XB converted by the gear box 14C, and a driven gear 14E that has an axial center coincident with the vertical axis XB and meshes with the drive gear 14D, The driven gear 14E is configured on the floor surface so as to be smoothly rotated about the vertical axis XB via a ball bearing (not shown) on the floor surface. According to the base rotation drive mechanism 14, the rotation of the motor 14 </ b> A is transmitted to the driven gear 14 </ b> E via the endless belt 14 </ b> B to the gear box 14 </ b> C to the drive gear 14 </ b> D. Along with the rotation around XB, the C-arm 4 is orientated at an intersecting angle θ with respect to the center line 1A of the top plate 1 at an oblique angle. By controlling the rotation direction and the rotation amount of the motor 14A to adjust the rotation amount of the driven gear 14E, the crossing angle θ of the C-arm 4 with respect to the center line 1A of the top plate 1 can be set as a desired angle.

  As described above, when the C-arm 4 is obliquely intersected at the intersection angle θ with respect to the center line 1A of the top board 1 when viewed in plan during X-ray imaging, the subject on the top board 1 is observed. Since the degree to which the C-type arm 4 covers M is alleviated, the surgeon and caregiver can perform treatment and care without being interrupted by the C-type arm 4 in parallel with X-ray imaging. The intersection angle θ is usually an angle in the range of 30 ° to 60 ° (for example, an angle of 45 °).

  Further, in the case of the apparatus of the first embodiment, in addition to the configuration in which the crossing angle θ can be set by an input operation using the operation unit 12 or the like, the base rotation control unit 15 is provided at the front stage of the base rotation drive mechanism 14. The base rotation control unit 15 controls the base rotation drive mechanism 14 based on the crossing angle θ set by the input operation by the operation unit 12 and the like, and the base rotation control unit 15 Under the control, the base rotation drive mechanism 14 rotates the support base 5 and crosses the C-shaped arm 4 diagonally with respect to the center line 1A of the top plate 1 at the crossing angle θ set by the operation unit 12 or the like. Make the orientation.

  Further, the apparatus of the first embodiment includes an imaging system rotation drive mechanism 16 that rotates the radiation cone 8 and the two-dimensional X-ray detector 3 about the X-ray irradiation axis XA, and the center of the top plate 1 of the C-type arm 4. Based on the crossing angle θ with respect to the line 1A, the radiation cone 8 and the two-dimensional X-ray detector 3 are rotated in the same direction by the same angle with the X-ray irradiation axis XA as the rotation center, so that the C-arm 4 is the center line of the top plate 1 Imaging system rotation control for controlling the imaging system rotation drive mechanism 16 to eliminate the deviation of the orientation of the imaging system with respect to the center line 1A of the top plate 1 that occurs when it is obliquely intersected with 1A at an intersection angle θ. Part 17.

  As shown in FIGS. 2 and 7, the imaging system rotation drive mechanism 16 includes a radiation cone rotation unit 16A and an X-ray detector rotation unit 16B.

  The radiation cone rotating unit 16A includes a motor 16A1, a transmission gear 16A2 that transmits the rotation of the motor 16A1, and a driven gear 16A3 that has an axial center coincident with the X-ray irradiation axis XA and meshes with the transmission gear 16A2. The driven gear 16A3 is attached in a state of being fitted on the outer periphery of the radiation cone 8. According to the radiation cone rotating portion 16A, as the rotation of the motor 16A1 is transmitted to the driven gear 16A3 via the transmission gear 16A2, the driven gear 16A3 rotates around the X-ray irradiation axis XA, and the radiation cone 8 It rotates about the irradiation axis XA as the center of rotation. The direction and amount of rotation of the radiation cone 8 can be controlled by adjusting the direction and amount of rotation of the driven gear 16A3 by controlling the direction and amount of rotation of the motor 16A1.

  The X-ray detector rotating unit 16B includes a motor 16B1, a transmission gear 16B2 that transmits the rotation of the motor 16B1, and a driven gear 16B3 that has the same axis as the X-ray irradiation axis XA and meshes with the transmission gear 16B2. And the driven gear 16B3 is attached in a state of being fitted on the outer periphery of the two-dimensional X-ray detector 3. According to the X-ray detector rotating unit 16B, as the rotation of the motor 16B1 is transmitted to the driven gear 16B3 via the transmission gear 16B2, the driven gear 16B3 rotates around the X-ray irradiation axis XA, and the two-dimensional X-ray The detector 3 rotates about the X-ray irradiation axis XA. The direction and amount of rotation of the two-dimensional X-ray detector 3 can be controlled by controlling the direction and amount of rotation of the motor 16B1 to adjust the direction and amount of rotation of the driven gear 16B3.

  The radiation cone rotating unit 16A and the X-ray detector rotating unit 16B are set at the intersection angle θ of the C-arm 4 with respect to the center line 1A of the top board 1 by the radiation cone rotating unit 16A according to the control of the imaging system rotation control unit 17. Based on this, the radiation cone 8 and the two-dimensional X-ray detector 3 are rotated by the same angle in the same direction with the X-ray irradiation axis XA as the rotation center, and the C-arm 4 is intersected with the center line 1A of the top 1 The deviation of the orientation of the imaging system with respect to the center line of the top plate 1 that occurs when the orientation is obliquely intersected by θ is eliminated.

  The main control unit 18 is mainly composed of a computer (CPU) and an operation program. Appropriate command signals and data are input according to various command inputs from the operation unit 12 or the progress of X-ray imaging. Is delivered to the necessary places in a timely manner, and the overall control function is performed so that the entire apparatus is always operated properly.

  As shown in FIG. 5, the square X-ray detection area 3a of the two-dimensional X-ray detector 3 is a reference state when the crossing angle θ is parallel to the center line 1A of the top board 1 so that the crossing angle θ is zero. The correspondence between the detection points of the X-ray detection area 3a and the pixels of the acquired X-ray fluoroscopic image is attached. Accordingly, the two-dimensional X-ray detector as shown by a two-dot chain line in FIG. 6 as the C-shaped arm 4 obliquely intersects the center line 1A of the top board 1 at the intersection angle θ. When the X-ray detection area 3a of 3 is obliquely intersected with the center line 1A of the top board 1 at an intersection angle θ, the detection points of the X-ray detection area 3a and the pixels of the acquired X-ray fluoroscopic image Is broken, and the direction of the acquired X-ray fluoroscopic image becomes oblique. Therefore, in the case of the apparatus according to the first embodiment, the X-ray detector rotating unit 16B rotates the two-dimensional X-ray detector 3 in the reverse direction by an amount corresponding to the intersection angle θ with the X-ray irradiation axis XA as the rotation center. As shown by a solid line in FIG. 6, the X-ray detection area 3a is set in parallel with the crossing angle θ being zero with respect to the center line 1A of the top board 1, and the detected X of the X-ray detection area 3a is acquired. It prevents that the correspondence with the pixel of a fluoroscopic image collapses.

  However, as indicated by a two-dot chain line in FIG. 6, even if the X-ray detection area 3a is parallel to the center line 1A of the top plate 1 so that the crossing angle θ is zero, A radiation cone that defines the cross-sectional shape of the X-ray beam 2a as shown in an enlarged view by a one-dot chain line in FIG. 3 as it becomes obliquely intersecting with the center line 1A of the plate 1 at an intersecting angle θ. Assuming that the direction of 8 is also obliquely intersecting with the center line 1A of the top plate 1 at an intersection angle θ, the direction of the X-ray beam 2a is also the top plate as shown by a two-dot chain line in FIG. It is in a direction that obliquely intersects the center line 1A of 1 at an intersection angle θ. If this occurs, a deviation of the crossing angle θ occurs between the X-ray beam 2a and the X-ray detection area 3a, and transmitted X-rays are not detected (does not hit) at the corners of the X-ray detection area 3a. X-ray fluoroscopic image. Therefore, in the case of the apparatus of the first embodiment, the radiation cone 8 is also rotated reversely by an amount corresponding to the crossing angle θ with the X-ray irradiation axis XA as the rotation center, as shown by the solid line in FIG. Is set to be parallel to the center line 1A of the top plate 1 so that the crossing angle θ becomes zero, thereby preventing the deviation of the crossing angle θ between the X-ray beam 2a and the X-ray detection area 3a.

  As described above, in the case of the apparatus of the first embodiment, in addition to rotating the two-dimensional X-ray detector 3 in the reverse direction corresponding to the intersection angle θ with the X-ray irradiation axis XA as the rotation center, the radiation cone 8 is also X Occurs when the C-arm 4 is rotated obliquely at a crossing angle θ with respect to the center line 1A of the top plate 1 by rotating the line irradiation axis XA as the rotation center in the reverse direction corresponding to the crossing angle θ. A misalignment of the orientation of the imaging system with respect to the center line of the top plate 1 is avoided. As a result, even when the C-shaped arm 4 is obliquely intersected with the center line 1A of the top board 1 at the intersection angle θ, the direction of the acquired X-ray fluoroscopic image becomes oblique or X-ray fluoroscopic The corners of the image are not missing.

  Furthermore, when the deviation of the orientation of the imaging system with respect to the center line 1A of the top plate 1 that occurs when the C-shaped arm 4 is obliquely intersected with the center line 1A of the top plate 1 at an intersecting angle θ, Instead of rotating the entire X-ray tube 2, only the X-ray beam shaping radiation cone 8 that is a part of the X-ray tube 2 as a whole is rotated, so that the X-ray tube has a considerable weight and size. There is no difficulty as in rotating the whole of 2.

  Therefore, according to the X-ray fluoroscopic apparatus of the present invention, the C-shaped arm 4 holding the X-ray tube 2 for X-ray irradiation and the two-dimensional X-ray detector 3 for X-ray detection in an opposed arrangement state. The deviation of the orientation of the imaging system with respect to the center line 1A of the top plate 1 that occurs when the subject M is placed obliquely intersecting the center line 1A of the top plate 1 can be eliminated in an appropriate manner. it can.

  A second embodiment of the X-ray diagnostic apparatus according to the present invention will be described. FIG. 8 is a front view showing mainly the configuration of the imaging system rotation drive mechanism 16 of the medical X-ray fluoroscopic apparatus according to the second embodiment.

  As shown in FIG. 8, the X-ray fluoroscopic apparatus according to the second embodiment includes a collimator 19 in front of the radiation cone 8 and the radiation cone 8 and the collimator 19 have a square radiation X-ray. The X-ray beam 2a having a cross-sectional shape is arranged, and the imaging system rotation drive mechanism 16 uses a collimator 19 around the X-ray irradiation axis XA as a rotation center in addition to the radiation cone rotation unit 16A and the X-ray detector rotation unit 16B. The collimator rotating unit 16 </ b> C is rotated, and the collimator rotating unit 16 </ b> C is the same as the radiation cone 8 with the collimator 19 as the rotation center of the X-ray irradiation axis XA by the control of the imaging system rotation driving mechanism 16 by the imaging system rotation control unit 17. Since the apparatus is substantially the same as the apparatus of the first embodiment except that the direction is rotated by the same angle, only the differences will be described, and common points will be described. Explanations are omitted.

  That is, the collimator rotating unit 16C includes a motor 16C1, a transmission gear 16C2 that transmits the rotation of the motor 16C1, and a driven gear 16C3 that has the same axis as the X-ray irradiation axis XA and meshes with the transmission gear 16C2. And the driven gear 16C3 is attached in a state of being fitted on the outer periphery of the collimator 19. According to the collimator rotating unit 16C, as the rotation of the motor 16C1 is transmitted to the driven gear 16C3 via the transmission gear 16C2, the driven gear 16C3 rotates around the X-ray irradiation axis XA, and the collimator 19 is rotated to the X-ray irradiation axis. Rotate around XA. The direction and amount of rotation of the collimator 19 can be controlled by controlling the direction and amount of rotation of the motor 16C1 to adjust the direction and amount of rotation of the driven gear 16C3.

  Since the X-ray beam 2a has a cross-sectional shape defined by the collimator 19 similarly to the radiation cone 8, the X-ray detection area 3a is parallel to the center line 1A of the top plate 1 so that the crossing angle θ is zero. Even if there is a collimator 19 which is a defining factor of the cross-sectional shape of the X-ray beam 2a as the C-arm 4 is obliquely intersected with the center line 1A of the top plate 1 at an intersecting angle θ. The X-ray beam 2a is completely crossed with respect to the center line 1A of the top board 1 if the orientation of the X-ray beam 2a remains obliquely crossed with the center line 1A of the top board 1 at the crossing angle θ. The orientation is not parallel so that θ is zero. As a result, a deviation corresponding to the crossing angle θ occurs between the X-ray beam 2a and the X-ray detection area 3a, and transmitted X-rays are not detected in a part of the X-ray detection area 3a. The situation where a part is missing occurs. Therefore, also in the case of the apparatus of the second embodiment, in addition to the radiation cone 8, the collimator 19 is also rotated reversely by an amount corresponding to the intersection angle θ with the X-ray irradiation axis XA as the rotation center (that is, the collimator 19 is also the X-ray irradiation axis XA). Is rotated in the same direction as the radiation cone 8 by the same angle), and the X-ray beam 2a is completely parallel to the center line 1A of the top plate 1 so that the crossing angle θ is zero, It prevents the deviation according to the crossing angle θ between the X-ray beam 2a and the X-ray detection area 3a.

  As described above, in the case of the apparatus of the second embodiment, the radiation X-rays are adjusted to the X-ray beam 2a having a square cross section by both the radiation cone 8 and the collimator 19, so The degree of freedom in adjusting the cross-sectional shape of the X-ray beam is increased as compared with the case of adjusting the X-ray beam having a square cross-sectional shape. When the imaging system rotation control unit 17 controls the imaging system rotation drive mechanism 16, the collimator 19 also uses the radiation cone 8 and the two-dimensional X-ray detector 3 with the X-ray irradiation axis XA as the rotation center in the same direction and the same angle. Since it is rotated, the orientation of the collimator 19 remains unchanged, and the center line 1A of the top plate 1 that occurs when the C-shaped arm 4 is obliquely intersected with the center line 1A of the top plate 1 at an intersection angle θ. The collimator 19 does not prevent the collimator 19 from canceling the deviation of the orientation of the imaging system with respect to.

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

  (1) In the case of the apparatuses of Examples 1 and 2, the radiation cone 8 attached to the radiation port of the X-ray tube 2 adjusts the cross-sectional shape of the X-ray beam 2a to a square. However, in the case of the apparatus of the present invention, the radiation cone is not limited to the one in which the cross-sectional shape of the X-ray beam is adjusted to a square, and the cross-sectional shape of the X-ray beam is, for example, rectangular or elliptical. Any radiation cone that arranges into a non-round shape other than a square can be used.

  (2) In the case of the apparatus of the second embodiment, the collimator 19 provided in front of the radiation cone 8 has a one-stage configuration, but in the case of the apparatus of the present invention, two collimators are provided in front of the radiation cone. It may be of a stage configuration.

  (3) In the case of the apparatuses of Examples 1 and 2, the imaging system holding member that holds the X-ray tube 2 and the two-dimensional X-ray detector 3 in the opposed arrangement state is the C-type arm 4, but the X-ray tube 2 The imaging system holding member that holds the two-dimensional X-ray detector 3 is not limited to the C-type arm 4 and may be, for example, a U-type arm.

  (4) In the devices of Examples 1 and 2, the support base 5 was a floor installation type, but instead of the floor installation type support base 5, a ceiling suspended type support base was used. The X-ray fluoroscopic apparatus having the same configuration as that of Example 1 or Example 2 is given as a modified example.

  (5) In the devices of Examples 1 and 2, the base rotation drive mechanism 14 is configured to rotate the support base 5 according to the control of the base rotation control unit 15. An angle detection mechanism that detects the crossing angle θ of the C-arm 4 with respect to the center line 1A of the top plate 1 in the rotation of the support base 5 is provided in the support base 5 while being rotated manually instead of the motor. X-ray fluoroscopy having the same configuration as in the first or second embodiment except that the imaging system rotation control unit 17 controls the imaging system rotation drive mechanism 16 based on the intersection angle θ detected by the angle detection mechanism. Each of the imaging devices is given as a modification.

  (6) Although the apparatuses of Examples 1 and 2 are X-ray fluoroscopic apparatuses, the present invention can be applied to X-ray diagnostic apparatuses other than X-ray fluoroscopic apparatuses.

  (7) Although the devices of the first and second embodiments are medical devices, the device of the present invention is not limited to medical devices, and can be applied to, for example, industrial devices.

1 is a block diagram illustrating an overall configuration of a medical X-ray fluoroscopic apparatus according to Embodiment 1. FIG. 1 is a front view showing an imaging stand of an X-ray fluoroscopic apparatus of Example 1. FIG. 1 is a perspective view showing an X-ray tube of an X-ray fluoroscopic apparatus according to Embodiment 1. FIG. It is a schematic diagram which shows the cross-sectional shape of the X-ray beam irradiated with the X-ray tube of the apparatus of Example 1. FIG. 3 is a schematic diagram illustrating an X-ray detection area of a two-dimensional X-ray detector of the apparatus according to Embodiment 1. FIG. It is a schematic diagram which shows the correspondence of the X-ray beam and X-ray detection area in the apparatus of Example 1. It is a front view which mainly shows the structure of the base rotation drive mechanism of the apparatus of Example 1, and an imaging system rotation drive mechanism. It is a front view which mainly shows the structure of the imaging system rotation drive mechanism of the apparatus of Example 2. FIG. It is a top view which shows the principal part structure of the imaging stand of the conventional X-ray fluoroscope. It is a top view which shows the principal part structure of the imaging stand of another conventional X-ray fluoroscopic imaging apparatus. It is a schematic diagram which shows the relationship between the diagonal insertion of the C-arm in the conventional apparatus, and the direction of an X-ray detection area. It is a schematic diagram which shows the relationship between the diagonal insertion of the C-arm in the conventional apparatus, and the direction of an X-ray beam. It is a schematic diagram which shows the correspondence of the X-ray detection area and X-ray beam at the time of the diagonal insertion of the C-type arm in the conventional apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Top plate 1A ... Centerline (of top plate) 2 ... X-ray tube (X-ray irradiation means)
2a ... X-ray beam 3 ... Two-dimensional X-ray detector 3a ... X-ray detection area 4 ... C-type arm (imaging system holding member)
DESCRIPTION OF SYMBOLS 5 ... Support base 8 ... Radiation cone 16 ... Imaging system rotation drive mechanism (imaging system rotation drive means)
17: Imaging system rotation control unit (imaging system rotation control means)
19 ... Collimator M ... Subject XA ... X-ray irradiation axis θ ... Crossing angle

Claims (3)

  An X-ray tube for X-ray irradiation, in which a top plate on which the subject is placed, a radiation cone that restricts the radiation X-rays to prepare a non-circular cross-sectional X-ray beam, and is attached to the radiation port; A two-dimensional X-ray detector for X-ray detection for detecting X-rays transmitted through the subject on the top plate in an X-ray detection area corresponding to the cross-sectional shape of the X-ray beam, an X-ray tube, and 2 A state in which the X-ray irradiation axis passing through the focal point of the X-ray tube passes through the center of the X-ray detection surface of the two-dimensional X-ray detector and the X-ray tube and the two-dimensional X-ray detector face each other. The imaging system holding member is supported by the imaging system holding member, and the imaging system holding member is supported when the imaging system holding member is supported in a plan view with the top plate positioned between the X-ray tube and the two-dimensional X-ray detector. Support base that can be oriented obliquely at a crossing angle θ with respect to the center line of the plate, radiation cone, and two-dimensional X-ray detector An imaging system rotation driving means for rotating the X-ray irradiation axis about the rotation center, and an X-ray irradiation axis for rotating the radiation cone and the two-dimensional X-ray detector based on an intersection angle θ with respect to the center line of the imaging system holding member. Rotation of the imaging system with respect to the center line of the top plate that occurs when the imaging system holding member is rotated at the same angle in the same direction as the center so that the imaging system holding member is obliquely intersected with the crossing angle θ with respect to the center line of the top plate An X-ray diagnostic apparatus, comprising: an imaging system rotation control unit that performs control for canceling the imaging system rotation driving unit.   2. The X-ray diagnostic apparatus according to claim 1, wherein in the X-ray tube, a radiation cone restricts the emitted X-rays to form an X-ray beam having a rectangular cross-sectional shape, and in the two-dimensional X-ray detector, a square X-ray. An X-ray diagnostic apparatus whose detection area detects transmitted X-rays. 3. The X-ray diagnostic apparatus according to claim 1 or 2, wherein the X-ray tube has a collimator in front of the radiation cone, and the radiation X-ray has a non-circular cross-sectional shape with the collimator. The collimator also adjusts the X-ray irradiation axis by controlling the imaging system rotation driving means by the imaging system rotation control means in addition to rotating the collimator around the X-ray irradiation axis as the rotation center. An X-ray diagnostic device that can be rotated by the same angle in the same direction as the radiation cone as the center of rotation.

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