JP5880287B2 - X-ray equipment - Google Patents

Description

  The present invention provides an X-ray imaging system including an X-ray tube, an X-ray detection unit that detects X-rays irradiated from the X-ray tube and passed through a subject, and a bucky mechanism that swings a scattered radiation removal grid. Relates to the device.

  The scattered radiation removal grid used in such an X-ray imaging apparatus is for improving the contrast of an image captured by removing scattered X-rays during X-ray imaging. The absorbent member and the X-ray transparent intermediate member such as aluminum are alternately arranged. When X-ray imaging is performed using this scattered radiation removal grid, the scattered radiation removal grid is reciprocated in a direction orthogonal to the fringes in order to prevent the grid of the grid from appearing in stripes in the X-ray image. A bucky mechanism that performs X-ray imaging by irradiating X-rays in a moved (swinged) state is employed.

  However, the scatter removal grid is not always used. Since this scattered radiation removal grid absorbs part of the X-rays, for example, when performing imaging by automatic exposure control using a phototimer, the exposure X-ray dose to the subject is increased. For this reason, when imaging a child whose X-ray exposure is particularly desired to be reduced, gridless imaging in which X-ray imaging is performed with the scattered radiation removal grid removed may be performed. In addition, since the focusing grid of the scattered radiation removal grid has a focusing distance suitable for imaging, the focusing grid may be replaced with one having an appropriate focusing distance according to the imaging distance. Furthermore, the scattered radiation removal effect may be adjusted by changing the grid ratio or grid density of the scattered radiation removal grid. For this reason, in the Bucky mechanism, it is necessary to make the scattered radiation removal grid detachable.

  In Patent Document 1, a convex part in which a long hole extending in the vertical direction is formed in the upper center of the grid is provided, and a crank pin connected to the long hole of the convex part in an eccentric state with respect to the rotation shaft of the motor is provided. An apparatus for processing radiation image information is disclosed in which a grid is reciprocated through a crankpin by engaging and rotating a rotating shaft of a pulse motor.

  Patent Document 2 includes an improper timing in an X-ray imaging apparatus that includes a lock mechanism that restricts the operation of attaching and detaching the grid unit, and a sensor group that monitors the operation of the lock mechanism. An X-ray imaging apparatus that prohibits the grid attachment / detachment operation is disclosed.

  In Patent Document 3, the grid unit is provided with a locking unit that locks the grid so as not to move with respect to the housing, and the photographing apparatus body has a release unit that acts on the locking unit to release the locked state. There is disclosed an X-ray imaging apparatus that is provided and enables safe attachment / detachment of a grid and stable driving of the grid.

JP 2003-334182 A JP 2003-250797 A JP 2001-333895 A

  By the way, in such a bucky mechanism, the swinging operation of the scattered radiation removal grid is started before the X-ray irradiation is started, and the swinging operation of the scattered radiation removal grid is stopped when the X-ray irradiation is completed. For this reason, the stop position of the scattered radiation removal grid when the swinging operation ends is different depending on the imaging time. Therefore, when performing the attachment / detachment work of the scattered radiation removal grid, the operator may feel uncomfortable with the operation due to the difference in the insertion amount and the attachment / detachment position of the scattered radiation removal grid. Further, when the scattered radiation removal grid stops at a position far from the vicinity of the entrance, there is a problem that it is difficult to take out the scattered radiation removal grid.

  Further, in such a bucky mechanism, generally, as described in Patent Document 1 described above, the scattered radiation removing grid is formed by a crank slider mechanism using a crank pin and a slider that are rotated by driving a motor. Oscillating motion is realized. When the scattered radiation removal grid is fixed to the bucky mechanism, a spring that urges the scattered radiation removal grid inserted from the entrance in the direction of the entrance is provided, and the scattered radiation that is about to jump out of the entrance by the action of the spring. The structure which fixes a removal grid with a fixed nail | claw is employ | adopted. When the scattered radiation removal grid is taken out from the bucky mechanism, the fixed claw is moved to an extraction position separated from the scattered radiation removal grid by pressing the movement mechanism of the fixed claw via an extraction button arranged near the entrance. I am letting.

  In such a case, if the scattered radiation removal grid stops at a position far from the vicinity of the entrance, the fixed claw moving mechanism cannot be pressed even if the extraction button is pressed, and the fixed claw is moved to the extraction position. It may not be possible.

  Further, when the crank arm in the crank slider mechanism is not at the dead point, that is, when the posture of the crank is not the posture corresponding to the position of the both ends of the swing of the scattered radiation removal grid, the extraction button is pressed. However, the moving mechanism of the fixed claw may move with the scattered radiation removal grid and the like, and the fixed claw may not be moved to the removal position. In such a case, it is possible to limit the movement of the fixed claw moving mechanism and the scattered radiation removal grid by adopting a configuration such as disposing a speed reducer between the motor and the crankpin. The apparatus becomes large and becomes an obstacle to X-ray imaging work.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide an X-ray imaging apparatus capable of suitably performing the attaching / detaching operation of the scattered radiation removal grid.

The invention described in claim 1 includes an X-ray tube, an X-ray detector that detects X-rays that have been irradiated from the X-ray tube and passed through the subject, and a bucky mechanism that swings the scattered radiation removal grid. In the X-ray imaging apparatus, the bucky mechanism is connected to a grid support portion that supports the scattered radiation removal grid inserted from the grid insertion port, and a crankshaft that is rotated by driving of the motor, with the crankshaft as a center. A crank arm that rotates and is provided with a crank pin; a long hole that is engaged with the crank pin; and a slider that is connected to the grid support portion, the crank arm being centered on the crank shaft By rotating the grid support portion together with the scattered radiation removal grid in a direction crossing the long hole in the slider. And Nkusuraida mechanism, by controlling the rotation of the motor, when taking out the anti-scatter grid from the grid support portion, so as to be located closer to the grid insertion opening, the crank arm, the crank And a control unit arranged at a position where the pin is close to the grid insertion port.

  According to a second aspect of the present invention, in the first aspect of the present invention, the position of the crank pin close to the grid insertion port is determined from the position of the crank pin closest to the grid insertion port. Is a position rotated within 30 degrees.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the urging means is arranged on the grid support portion and urges the scattered radiation removal grid in the direction of the grid insertion opening. , Between the fixed position of the scattered radiation removal grid that is disposed near the grid insertion opening in the grid support section and is in contact with the scattered radiation removal grid and the extraction position of the scattered radiation removal grid separated from the scattered radiation removal grid A grid fixing mechanism having a moving fixing claw, and an extraction button for moving the fixing claw from the fixed position to the extraction position by pressing the grid fixing mechanism.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the control unit is configured so that the crank support is the crank arm and the crank pin is the Place it near the grid slot.

  The invention according to claim 5 is the invention according to any one of claims 1 to 3, wherein the control unit receives an extraction preparation signal for extracting the scattered radiation removal grid from the grid support unit. Sometimes, the crank arm is arranged at a position where the crank pin is close to the grid insertion port.

  According to the first or second aspect of the present invention, since the crank arm is disposed at a position where the crank pin is close to the grid insertion port when the scattered radiation removing grid is taken out, the scattered radiation removing grid is always arranged in the grid. It becomes possible to arrange | position in the position close | similar to an insertion port. For this reason, it becomes possible to suitably perform the attaching / detaching work of the scattered radiation removal grid always in the same state.

  According to the third aspect of the present invention, it is possible to reliably press the grid fixing mechanism with the push button and move the fixing claw to the extraction position of the scattered radiation removal grid.

  According to the invention described in claim 4, when the scattered radiation removal grid is stopped, the scattered radiation removal grid can always be arranged at a position close to the grid insertion opening. For this reason, it becomes possible to suitably perform the attaching / detaching work of the scattered radiation removal grid always in the same state.

  According to the fifth aspect of the present invention, it is possible to dispose the scattered radiation removal grid at a position close to the grid insertion port after receiving the extraction preparation signal. For this reason, even when the scattered radiation removal grid is placed at a position suitable for other operations, the scattered radiation removal grid can always be placed at a position close to the grid insertion opening when the scattered radiation removal grid is taken out. It becomes.

1 is a schematic diagram of an X-ray imaging apparatus according to the present invention. 3 is a schematic diagram of a hand switch 80. FIG. It is a block diagram which shows the control system of the X-ray imaging apparatus which concerns on this invention. 2 is a schematic plan view of the bucky mechanism 1. FIG. FIG. 4 is an enlarged view of the vicinity of a grid fixing mechanism in the bucky mechanism 1. FIG. 4 is an enlarged view of the vicinity of a grid fixing mechanism in the bucky mechanism 1. 4 is an enlarged view of the vicinity of a crank slider mechanism in the bucky mechanism 1. FIG. 4 is an enlarged view of the vicinity of a crank slider mechanism in the bucky mechanism 1. FIG. 4 is an enlarged view of the vicinity of a crank slider mechanism in the bucky mechanism 1. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of an X-ray imaging apparatus according to the present invention.

  The X-ray imaging apparatus according to the present invention includes a table-type X-ray imaging table 2 for imaging a subject on the top board 11 in a lying position, and a stand-type X-ray for imaging the subject in a standing position. An imaging table 3, an X-ray irradiation unit 4, and a high voltage device 5 for an operator to perform an X-ray imaging operation are provided. The table type X-ray imaging table 2 and the stand type X-ray imaging table 3 are each provided with a bucky mechanism 1. The table-type X-ray imaging table 2, the stand-type X-ray imaging table 3, and the X-ray irradiation unit 4 are installed in an imaging room for performing imaging on a subject. The high voltage device 5 is installed in an operation room for an operator to perform an X-ray imaging operation. The photographing room and the operation room are blocked by a partition wall 22.

  The table-type X-ray imaging table 2 includes a top plate 11 for placing the subject in a lying position, a bucky mechanism 1, and a moving mechanism 12 for moving the top plate 11 and the bucky mechanism 1. Is provided. On the other hand, the stand-type X-ray imaging table 3 includes a bucky mechanism 1 similar to the table-type X-ray imaging table 2, and an elevating member 23 that lifts and lowers the bucky mechanism 1 according to the height and imaging region of the subject. Is provided. Note that an X-ray detector such as a flat panel detector or a cassette containing an X-ray film is disposed inside the Bucky mechanism 1 as an X-ray detector.

  The X-ray irradiation unit 4 includes an X-ray tube 15, a collimator 16, and an operation handle 17. These X-ray tube 15, collimator 16, and operation handle 17 can be moved horizontally in the X, Y, and Z directions by an arm 14 that hangs down from a support portion 13 fixed to the ceiling, and have a horizontal axis and a vertical axis. It is rotatably supported at the center. Therefore, the X-ray tube 15 and the collimator 16 can be disposed opposite to both the table-type X-ray imaging table 2 and the stand-type X-ray imaging table 3.

  On the other hand, the high voltage device 5 installed in the operation room includes an operation panel 18 having a liquid crystal display unit 19, a plurality of operation switches 21, and an indicator 84 indicating that the X-ray tube 15 is ready for imaging, And a hand switch 80 having a two-stage push button.

  FIG. 2 is a schematic diagram of the hand switch 80.

  The hand switch 80 includes a grip portion 83 that is gripped by an operator, and a first operation button 81 and a second operation button 82 that are disposed at one end of the grip portion 83. These first and second operation buttons 81 and 82 are buttons that can be pressed continuously in two stages. When the first operation button 81 is pressed, an imaging preparation start signal is transmitted from the high voltage device 5 to the X-ray tube 15, and when the second operation button 82 is pressed, the high voltage device 5 outputs X. An X-ray irradiation signal is transmitted toward the tube 15.

  FIG. 3 is a block diagram showing a control system of the X-ray imaging apparatus according to the present invention. In FIG. 3, only one of the bucky mechanisms 1 provided on the table type X-ray imaging table 2 and the stand type X-ray imaging table 3 is shown as a representative. The device 5 is also connected to another bucky mechanism 1.

  The bucky mechanism 1, the high voltage device 5, and the X-ray tube 15 are each provided with control units 95, 96, and 97 having a CPU and the like, and their operations are controlled by these control units 95, 96, and 97. The The bucky mechanism 1 and the high voltage device 5 are connected by a signal line 91, the bucky mechanism 1 and the X-ray tube 15 are connected by a signal line 92, and the high voltage device 5 and the X-ray tube 15 are connected by a signal line 93, respectively. ing. The bucky mechanism 1 is provided with a stepping motor 40 for swinging the scattered radiation removal grid, as will be described later. The rotation of the stepping motor 40 is controlled by the control unit 95.

  In such an X-ray imaging apparatus, the scattered radiation removal grid is housed in the Bucky mechanism 1 to perform X-ray imaging, and the scattered radiation removal grid is removed from the Bucky mechanism 1 to perform X-ray imaging. There is a case. Even when the scattered radiation removal grid is used, it is necessary to exchange the scattered radiation removal grid in accordance with the imaging mode. For this reason, in these Bucky mechanisms 1, the structure which can perform suitably the attachment or detachment operation | work of a scattered radiation removal grid is employ | adopted.

  Hereinafter, the configuration of the bucky mechanism 1 will be described. FIG. 4 is a schematic plan view of the bucky mechanism 1.

  The bucky mechanism 1 includes a grid support portion 31 including a pair of guide members 33 that support the scattered radiation removal grid 32 inserted from the grid insertion port 10. In the state where the scattered radiation removal grid 32 is supported, the grid support section 31 inserts the scattered radiation removal grid 32 from the grid insertion port 10 with respect to the support plate 59 of the bucky mechanism 1 (the horizontal direction in FIG. 4). Can be moved back and forth.

  A handle 34 for attaching / detaching the scattered radiation removing grid 32 is attached to the side of the scattered radiation removing grid 32 having a rectangular shape on the grid insertion port 10 side. Further, a magnet member 35 in which a permanent magnet is enclosed is disposed on the side opposite to the handle 34 in the scattered radiation removal grid 32. Further, a plurality of proximity sensors 36 are disposed at positions facing the magnet member 35 on the support plate 59 of the bucky mechanism 1. Different magnets are encapsulated in the magnet member 35 disposed on the scattered radiation removal grid 32 depending on the type of the scattered radiation removal grid 32. Each proximity sensor 36 identifies the type of the scattered radiation removal grid 32 by detecting the magnetic force in the magnet member 35. Further, an urging member 37 having a spring therein is disposed at a position facing the side opposite to the handle 34 on the support plate 59 of the bucky mechanism 1. The urging member 37 is configured to urge the scattered radiation removal grid 32 toward the grid insertion port 10 (right direction in FIG. 4).

  A grid fixing mechanism is disposed at one end of the bucky mechanism 1 on the grid insertion port 10 side. 5 and 6 are enlarged views of the vicinity of the grid fixing mechanism in the bucky mechanism 1. FIG. 5 shows a case where the fixing claw 53 in the grid fixing mechanism is arranged at a fixed position of the scattered radiation removing grid 32 that contacts the scattered radiation removing grid 32, and FIG. 6 shows a fixing claw in the grid fixing mechanism. 53 shows a case where 53 is arranged at an extraction position of the scattered radiation removal grid 32 that is separated from the scattered radiation removal grid 32.

  The grid fixing mechanism includes a lever 51 that swings about a shaft 52 disposed on the grid support portion 31, a fixing claw 53 that swings about a shaft 54 disposed on the lever 51, and a lever 51. A take-out button 55 having a pin 56 capable of abutting on is provided. The take-out button 55 is urged in the direction away from the lever 51 (the right direction in FIGS. 5 and 6) by the action of the spring 57. The lever 51 is urged clockwise about the shaft 52 by a spring (not shown).

  As shown in FIG. 5, when the fixed claw 53 is disposed at a fixed position of the scattered radiation removal grid 32, the edge on the grid insertion port 10 side of the scattered radiation removal grid 32 comes into contact with the fixed claw 53. Regardless of the urging force of the urging member 37 shown in FIG. 4, the scattered radiation removal grid 32 is fixed at a position in contact with the fixed claw 53.

  In this state, when the eject button 55 is pressed, the pin 56 presses the lever 51, and the lever 51 rotates counterclockwise about the shaft 52. Along with this, the shaft 54 moves together with the fixed claw 53 in a direction away from the scattered radiation removal grid 32 (upward direction in FIGS. 5 and 6), and the fixed claw 53 is separated from the scattered radiation removal grid 32 shown in FIG. Move to the removal position. Thereby, a part of the scattered radiation removal grid 32 is exposed to the outside from the grid insertion port 10 by the urging force of the urging member 37. Note that when the scattered radiation removal grid 32 is taken out, the grid support portion 31 is fixed at the attachment / detachment position of the scattered radiation removal grid 32 as described later.

  In this state, the lever 51 is urged clockwise about the shaft 52 by a spring (not shown), so that the tip of the fixing claw 53 is held at the grid insertion port 10 even when the eject button 55 is stopped. To the side of the scattered radiation removal grid 32 exposed to the outside. In this state, as shown in FIG. 6, the contact portion formed at one end of the lever 51 presses the micro switch 58. Thereby, it can be detected that the scattered radiation removal grid 32 is in the middle of extraction, that is, that the scattered radiation removal grid 32 is in a half-inserted state.

  A crank slider mechanism as a swing mechanism for reciprocating the scattered radiation removal grid 32 is disposed at one end of the bucky mechanism 1 opposite to the grid insertion port 10. 7 to 9 are enlarged views of the vicinity of the crank slider mechanism in the bucky mechanism 1. 7 shows a state in which the crank pin 42 is arranged at the attachment / detachment position of the scattered radiation removal grid 32, FIG. 8 shows a state in which the crank pin 42 is arranged in the fastest position, and FIG. Reference numeral 42 denotes a state where it is arranged at a standby position before the start of X-ray imaging.

  As shown in these drawings, the crank slider mechanism is connected to a crankshaft 41 that rotates by driving of a stepping motor 40 fixed to a support plate 59, and a crank arm 43 that rotates around the crankshaft 41 (see FIG. 8). A crankpin 42 is attached to the tip of the crank arm 43. In addition, a slider 44 having a long hole 45 that can be engaged with the crank pin 42 is attached to the grid support portion 31. The long hole 45 is formed with a direction (vertical direction in FIGS. 7 to 9) orthogonal to the attaching / detaching direction of the scattered radiation removal grid 32 as a longitudinal direction. In this crank slider mechanism, when the stepping motor 40 is driven, the crank pin 42 rotates about the crankshaft 41, so that the grid support 31 together with the scattered radiation removal grid 32 is a long hole 45 formed in the slider 44. Reciprocate in the direction orthogonal to the direction, that is, the left-right direction in FIGS. When the rotation of the crankshaft 41 continues, the grid support portion 31 swings together with the scattered radiation removal grid 32.

  The parallel movement speed of the scattered radiation removal grid 32 at this time is as shown in FIG. 8 when the crank pin 42 is arranged near the edge of the long hole 45 (when arranged at the lower end or the upper end shown in FIG. 8). 7 and the latest when the crank pin 42 is disposed near the center of the long hole 45 as shown in FIG.

  In this X-ray imaging apparatus, when the X-ray imaging is finished and the reciprocating movement of the grid support unit 31 is stopped, the control unit 95 in the Bucky mechanism 1 controls the stepping motor 40, whereby the crank in the crank slider mechanism is controlled. As shown in FIG. 7, the arm 43 is disposed at a position where the crank pin 42 is close to the grid insertion port 10. This position is a position where the crank arm 43 becomes a dead point. By disposing the crank arm 43 at this position, the scattered radiation removal grid 32 can be suitably attached to and detached from the bucky mechanism 1.

  In addition, as a position where the crank pin 42 is close to the grid insertion port 10, it is preferable to adopt a position where the crank pin 42 is closest to the grid insertion port 10. However, when the crank pin 42 is positioned close to the grid insertion port 10, a position where the crank shaft 41 is rotated in a forward or reverse direction by a certain angle from a state where the crank pin 42 is closest to the grid insertion port 10 is adopted. In addition, the state of the crank arm 43 can be substantially changed to a dead point state by the action of a frictional force or the like. At this time, the range of the rotation angle in the forward and reverse directions of the crankshaft 41 is preferably within 30 degrees, and more preferably within 25 degrees.

  That is, when the crank arm 43 is disposed at the position shown in FIG. 7, the grid support portion 31 that supports the scattered radiation removal grid 32 is disposed on the grid insertion port 10 side. When the scattered radiation removal grid 32 is always arranged on the grid insertion port 10 side, the attachment / detachment work of the scattered radiation removal grid 32 can always be suitably performed in the same state. Therefore, when performing the attaching / detaching operation of the scattered radiation removal grid 32, the operator does not feel uncomfortable due to a difference in the insertion amount and the attachment / detachment position of the scattered radiation removal grid 32. In this case, since the grid support portion 31 that supports the scattered radiation removal grid 32 is arranged on the grid insertion port 10 side, the pin 56 is a lever when the take-out button 55 in the grid fixing mechanism is pressed. 51 is pressed, and the lever 51 can be rotated counterclockwise about the shaft 52.

  When the crank arm 43 is disposed at the position shown in FIG. 7, the crank arm 43 is disposed at the dead point, and the movement of the grid support portion 31 is limited. For this reason, even when the extraction button 55 is pressed to take out the scattered radiation removal grid 32, the grid support portion 31 does not move. On the other hand, when the crank arm 43 is arranged at the position shown in FIGS. 8 and 9, the crank arm 43 is not arranged at the dead point. It is executed only with a small holding torque of the motor 40. Therefore, when the extraction button 55 is pressed to take out the scattered radiation removal grid 32, the grid support portion 31 moves even if the pin 56 presses the lever 51, and the lever 51 is centered on the shaft 52. Thus, it cannot be rotated counterclockwise. In the bucky mechanism 1 according to the present invention, when the X-ray imaging is finished and the reciprocation of the grid support portion 31 is stopped, the crank arm 43 is disposed at a position where the crank pin 42 is close to the grid insertion port 10. Therefore, the occurrence of such a problem is prevented.

  When the grid support portion 31 is in the state shown in FIG. 7, when the X-ray imaging is started after the replacement work of the scattered radiation removal grid 32 is finished, the operator switches the hand switch 80 in the high voltage device 5. The first operation button 81 is pressed. Thereby, an imaging preparation start signal is transmitted from the high voltage device 5 to the X-ray tube 15, and the X-ray tube 15 rotates the rotor to start preparation for X-ray irradiation. This signal is also transmitted to the bucky mechanism 1, and the crank arm 43 moves from the position shown in FIG. 7 to the position shown in FIG. Thereby, the grid support part 31 is arrange | positioned with the scattered radiation removal grid 32 in the stand-by position before the X-ray imaging start shown in FIG. This standby position is an optimal position for accelerating the scattered radiation removal grid 32.

  Thereafter, when the operator presses the second operation button 82 of the hand switch 80 in the high-voltage device 5, the crank arm 43 rotates clockwise from the position shown in FIG. Then, when the crank arm 43 is arranged at the position shown in FIG. 8 and the speed of the scattered radiation removal grid 32 becomes the fastest, X-rays are emitted from the X-ray tube 15 and X-ray imaging is executed. After the X-ray imaging is completed, as described above, the control unit 95 in the bucky mechanism 1 controls the stepping motor 40, whereby the crank arm 43 in the crank slider mechanism is inserted into the crank pin 42 shown in FIG. It is arranged at a position close to the mouth 10. Thereby, the scattered radiation removal grid 32 can be suitably attached to and detached from the Bucky mechanism 1.

  Next explained is the second embodiment of the invention. In the first embodiment described above, the control unit 95 in the bucky mechanism 1 controls the stepping motor 40 so that the crank arm 43 and the crank pin 42 are connected to the grid insertion port 10 when the grid support unit 31 stops reciprocating. It arrange | positions in the attachment or detachment position of the scattered radiation removal grid 32 which adjoins. On the other hand, in the second embodiment, the control unit 95 in the bucky mechanism 1 controls the stepping motor 40 so that the crank arm 43 is placed on standby as shown in FIG. Place in position. When the control unit 95 in the bucky mechanism 1 receives an extraction preparation signal for extracting the scattered radiation removal grid 32 from the grid support unit 31, the crank arm 43 is moved from the standby position shown in FIG. 9 to the crank shown in FIG. The pin 42 is disposed at the attachment / detachment position of the scattered radiation removal grid 32 adjacent to the grid insertion port 10.

  Here, the extraction preparation signal for extracting the scattered radiation removal grid 32 from the grid support unit 31 is transmitted to the control unit 95 when the operator presses an operation button different from the extraction button 55, for example. This operation button can be installed at a position where the scattered radiation removal grid 32 can be easily operated, for example, at a position in the vicinity of the extraction button 55. In addition, instead of installing an operation button for transmitting an extraction preparation signal, a configuration may be adopted in which it is detected that the operator has approached the position where the operator can operate the extraction button 55 and an extraction preparation signal is transmitted. Good.

  As described above, a configuration is adopted in which the crank arm 43 is arranged at the standby position when the reciprocation of the grid support portion 31 is stopped, and the crank arm 43 is arranged at the attachment / detachment position of the scattered radiation removal grid 32 when the extraction preparation signal is received. In some cases, X-ray imaging can be performed quickly by moving the scattered radiation removal grid 32 at the time of X-ray imaging. When the scattered radiation removal grid 32 is taken out, the scattered radiation removal grid 32 can always be arranged at a position close to the grid insertion port 10.

DESCRIPTION OF SYMBOLS 1 Bucky mechanism 2 X-ray imaging stand 3 X-ray imaging stand 4 X-ray irradiation part 5 High voltage apparatus 10 Grid insertion port 11 Top plate 12 Moving mechanism 15 X-ray tube 16 Collimator 22 Bulkhead 23 Lifting member 31 Grid support part 32 Scattering ray Removal grid 33 Guide member 34 Handle 37 Energizing member 40 Stepping motor 41 Crank shaft 42 Crank pin 43 Crank arm 44 Slider 45 Long hole 51 Lever 52 Axis 53 Fixing claw 54 Axis 55 Eject button 56 Pin 57 Spring 59 Support plate 80 Hand switch 81 First operation button 82 Second operation button 95 Control unit 96 Control unit 97 Control unit

Claims (5)

In an X-ray imaging apparatus comprising an X-ray tube, an X-ray detection unit that detects X-rays irradiated from the X-ray tube and passed through a subject, and a bucky mechanism that swings a scattered radiation removal grid,
The bucky mechanism is
A grid support for supporting the scattered radiation removal grid inserted from the grid insertion port;
It is connected to a crankshaft that rotates by driving of a motor, rotates around the crankshaft, has a crank arm provided with a crankpin, an elongated hole that engages with the crankpin, and the grid support portion A slider connected to the slider, and the crank arm rotates about the crankshaft so that the grid support portion reciprocates in the direction intersecting with the long hole in the slider together with the scattered radiation removal grid. Mechanism,
By controlling the rotation of the motor, when the scattered radiation removal grid is taken out from the grid support portion , the crank arm is arranged so that the crank pin is disposed at a position close to the grid insertion port. A control unit arranged at a position close to the insertion port;
An X-ray imaging apparatus comprising: The X-ray imaging apparatus according to claim 1,
The position where the crank pin is close to the grid insertion port is a position where the crank shaft is rotated within a range of 30 degrees from the position where the crank pin is closest to the grid insertion port. The X-ray imaging apparatus according to claim 1 or 2,
An urging means disposed on the grid support portion for urging the scattered radiation removal grid toward the grid insertion port;
It is arranged near the grid insertion opening in the grid support part, and moves between a fixed position of the scattered radiation removal grid that contacts the scattered radiation removal grid and an extraction position of the scattered radiation removal grid separated from the scattered radiation removal grid. A grid fixing mechanism having a fixing claw to perform,
An extraction button that moves the fixing claw from the fixed position to the extraction position by pressing the grid fixing mechanism;
An X-ray imaging apparatus further comprising: The X-ray imaging apparatus according to any one of claims 1 to 3,
The control unit is an X-ray imaging apparatus that arranges the crank arm at a position where the crank pin is close to the grid insertion port when the grid support unit stops reciprocating. The X-ray imaging apparatus according to any one of claims 1 to 3,
The control unit, when receiving an extraction preparation signal for extracting the scattered radiation removal grid from the grid support unit, arranges the crank arm at a position where the crank pin is close to the grid insertion port. Shooting device.

Images