JP2015150054A - X-ray fluoroscopic table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray fluoroscopic table eliminating deterioration in sensitivity of an X-ray detector by reliably preventing an X-ray applied from an X-ray tube, from entering the X-ray detector in aging.SOLUTION: When executing the aging, an operator operates an operation part 39 to instruct a control part 30 about the aging. At this time, by control of the control part 30, a motor 26 is driven and an X-ray detector 14 is retracted to the side along with a support member. Thereby, an X-ray tube 12 and the X-ray detector 14 are disposed at positions so as not to face each other. In this state, an aging control part 38 executes the aging to the X-ray tube 12.

Description

  The present invention relates to an X-ray fluoroscopic table for performing X-ray fluoroscopy or X-ray imaging.

  Such an X-ray fluoroscopic imaging table includes a top plate, an X-ray tube that irradiates an X-ray to a subject placed in front of the top plate, and an X-ray tube that passes through the subject. An X-ray detector for detecting X-rays. When performing X-ray fluoroscopy or X-ray imaging with this X-ray fluoroscopic imaging table, the subject is placed on the front of the tabletop (when the patient is lying down, the subject is lying or lying on the top of the tabletop and standing upright. The X-ray tube and the X-ray detector are placed facing each other with the subject standing up in front of the top plate at the time of position imaging, and X-rays emitted from the X-ray tube are detected by the X-ray detector. I am doing so.

  By the way, in the X-ray imaging apparatus, it is necessary to perform aging in order to maintain the performance of the X-ray tube. This aging is a series of break-in energization that is performed when the X-ray tube is used for the first time, when the X-ray tube is not used for a certain period of time, or when the X-ray tube is used again, or at the start of every day.

  If the X-ray tube is not used for a certain period of time, the internal state changes. For example, even an X-ray tube having a maximum operating voltage of 150 kV may be able to withstand only a voltage of several tens of kV. If a high voltage is suddenly applied in such a state, the same phenomenon as overvoltage occurs, and the X-ray tube may be damaged. For this reason, a low voltage is first applied, then the voltage is gradually increased, and the voltage is lowered after a certain time has elapsed after the rated value is in a normal state. If an abnormal phenomenon such as the tube current becoming unstable occurs while the voltage is rising, the voltage is lowered to a point where the abnormality is settled, and the voltage is raised again after waiting until it becomes stable. By performing such aging, the X-ray tube can be used in a stable state.

  By the way, the aging performed by the service engineer when the X-ray tube is used for the first time or when the X-ray tube is not used for a certain period and is used again is a relatively large dose of X-rays from the X-ray tube for a long time. It will enter the detector. In such a case, the sensitivity of the X-ray detector is lowered, which adversely affects the subsequent adjustment. Further, at the time of aging performed by the user at the start of work, although the amount of X-rays incident on the X-ray detector is small, the sensitivity of the X-ray detector is lowered.

  For this reason, Patent Document 1 discloses an X-ray condition for aging an X-ray tube in an X-ray high voltage apparatus having an operation panel capable of presetting an X-ray condition for aging the X-ray tube. There is disclosed an X-ray high-voltage apparatus provided with a control circuit that automatically closes the aperture of a collimator attached to the radiation port of the X-ray tube by a signal for setting.

  According to the X-ray high voltage apparatus described in Patent Document 1, an X-ray condition for selecting an X-ray condition for aging the X-ray tube is selected on the operation panel, and the signal is then collimated. Since it is sent to the control circuit and the aperture of the collimator is automatically closed, the operator does not have to enter the X-ray examination room to close the collimator, and can safely perform the aging work.

JP 2000-30890 A

  In the X-ray high voltage apparatus described in Patent Document 1 described above, the aperture of the collimator can be automatically closed at the time of aging, so that the X-ray dose incident on the X-ray detector at the time of aging can be made small. it can. However, since it is difficult to eliminate the X-rays that pass through the collimator and reach the X-ray detector, the sensitivity of the X-ray detector is still lowered.

  The present invention has been made to solve the above problems, and reliably prevents the X-rays irradiated from the X-ray tube from entering the X-ray detector during aging, thereby reducing the sensitivity of the X-ray detector. An object of the present invention is to provide an X-ray fluoroscopic imaging table that does not cause any problems.

  According to the first aspect of the present invention, there is provided a top plate, an X-ray tube that irradiates an X-ray to a subject arranged in front of the top plate, and the subject that is irradiated from the X-ray tube. An X-ray fluoroscopic imaging table provided with an X-ray detector for detecting X-rays that have passed, an X-ray tube moving mechanism for moving the X-ray tube along the surface of the top plate, and the X-ray detection An X-ray detector moving mechanism for moving the detector along the surface of the top plate, an operation unit for instructing the X-ray tube to execute aging, and aging the operation unit When an instruction is given, the X-ray tube and the X-ray detector are moved by driving at least one of the X-ray tube and the X-ray detector by driving the X-ray tube moving mechanism or the X-ray detector moving mechanism. And a control unit that arranges the line detectors at positions that do not face each other. To.

  According to a second aspect of the present invention, in the first aspect of the invention, when the operation unit is instructed to execute aging, the celestial of the X-ray tube or the X-ray detector is selected. The thing arrange | positioned under the board is moved.

  According to the first aspect of the present invention, when an instruction to execute aging is given, the X-ray tube and the X-ray detector are not opposed to each other by moving at least one of the X-ray tube and the X-ray detector. Since the X-rays irradiated from the X-ray tube do not enter the X-ray detector during aging, it is possible to surely prevent the sensitivity of the X-ray detector from being lowered. Become.

  According to the second aspect of the present invention, since the X-ray tube or the X-ray detector arranged below the top plate is moved, the collision between the X-ray tube or the X-ray detector and the operator is prevented. The possibility can be reduced and aging can be executed safely.

1 is a schematic front view of a fluoroscopic imaging table according to the present invention. 1 is a schematic front view of a fluoroscopic imaging table according to the present invention. It is a side surface schematic diagram of the fluoroscopic imaging stand which concerns on this invention. It is a block diagram which shows the control system of the X-ray fluoroscopy table concerning this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 are schematic front views of a fluoroscopic imaging table according to the present invention. 1 shows a state where X-ray imaging or X-ray fluoroscopy is performed on the subject M, and FIG. 2 shows a state where aging is performed. FIG. 3 is a schematic side view of the fluoroscopic imaging table according to the present invention.

  The X-ray fluoroscopic table includes a top plate 11 on which the subject M is placed, an X-ray tube 12 that irradiates the subject M on the top plate 11 with X-rays, and an X-ray tube 12. A collimator 13 for regulating the X-ray irradiation field irradiated from the X-ray, an image intensifier (II) for detecting X-rays irradiated from the X-ray tube 12 and passing through the subject M, and a flat panel And an X-ray detector 14 such as a detector. The X-ray tube 12 and the collimator 13 are supported by a column 16 connected to the main body 15. The top plate 11 is also connected to the main body 15 by a connection mechanism (not shown).

  The support column 16 is configured to be movable in the horizontal direction with respect to the main body 15 by a pair of linear guides 21. A motor 23 is disposed on the support 16. A pinion 27 disposed on the rotation shaft of the motor 23 is engaged with a rack 22 extending in the horizontal direction (a direction parallel to the surface of the top plate 11) with respect to the main body 15. For this reason, the column 16 reciprocates along the surface of the top plate 11 by driving the motor 23. As the column 16 moves, the X-ray tube 12 and the collimator 13 also reciprocate along the surface of the top plate 11.

  The X-ray detector 14 is supported on the lower surface of the support member 18. The support member 18 is configured to be movable in the horizontal direction with respect to the main body 15 by a pair of linear guides 24. A motor 26 is disposed on the support member 18. A pinion 28 disposed on the rotation shaft of the motor 26 is engaged with a rack 25 extending in the horizontal direction (a direction parallel to the surface of the top plate 11) with respect to the main body 15. For this reason, the support member 18 reciprocates along the surface of the top plate 11 by driving the motor 26. As the support member 18 moves, the X-ray detector 14 also reciprocates along the surface of the top plate 11.

  The main body 15 is disposed so as to be rotatable with respect to the leg portion 17. For this reason, as shown in FIGS. 1 to 3, the top plate 11 has a surface position parallel to the floor surface 20 and faces in the horizontal direction, and the surface of the top plate 11 is perpendicular to the floor surface 20. It is also possible to take a standing posture in the vertical direction.

  FIG. 4 is a block diagram showing a control system of the X-ray fluoroscopic table according to the present invention.

  The X-ray fluoroscopic table according to the present invention includes a ROM 30 that stores an operation program necessary for controlling the apparatus, a RAM that temporarily stores data during control, and a control unit 30 that includes a CPU that executes logical operations. Have. The control unit 30 includes an aging control unit 38 for performing aging on the X-ray tube 12 described later. The aging control unit 38 performs aging by controlling the tube voltage applied to the X-ray tube 12 in accordance with an instruction from the operator.

  The control unit 30 is connected to the X-ray tube 12, the collimator 13, and the X-ray detector 14 described above. The control unit 30 is connected to a motor 23 for moving the support column 16 described above along the surface of the top plate 11 and a motor 26 for moving the support member 18 along the surface of the top plate 11. ing.

  Further, the control unit 30 is connected to a position detector 31 composed of an encoder and a potentiometer for detecting a position in a direction parallel to the surface of the top plate 11 of the column 16 supporting the X-ray tube 12. Similarly, the control unit 30 is connected to a position detector 32 including an encoder and a potentiometer for detecting a position in a direction parallel to the surface of the top plate 11 of the support member 18 that supports the X-ray detector 14. Yes. The control unit 30 includes a keyboard, a mouse, or a touch panel type input device, and is also connected to an operation unit 39 that executes various operations. As will be described later, the operation unit 39 functions as an operation unit for instructing the X-ray tube 12 to execute aging.

  In the X-ray fluoroscopic table having the above-described configuration, when performing X-ray imaging or X-ray fluoroscopy, the motor 23 and the motor 26 are driven by the control of the control unit 30, and the support column 16 and the support member 18 are connected to each other. 11, the X-ray tube 12 and the X-ray detector 14 are arranged to face each other as shown in FIG. In this state, the subject M is irradiated with X-rays from the X-ray tube 12, and the X-rays that have passed through the subject M are detected by the X-ray detector 14.

  On the other hand, aging is performed at the start of a day's work or when the X-ray fluoroscopic table is not used for a certain period. In this case, the operator operates the operation unit 39 to give an aging instruction to the control unit 30. At this time, the motor 26 is driven by the control of the control unit 30, and the X-ray detector 14 is retracted to the side together with the support member 18, as shown in FIG. Thereby, the X-ray tube 12 and the X-ray detector 14 are arrange | positioned in the position which is not mutually opposed. In this state, the aging control unit 38 performs aging on the X-ray tube 12.

  At this time, since the X-ray tube 12 and the X-ray detector 14 are not opposed to each other, the X-rays irradiated from the X-ray tube 12 do not enter the X-ray detector 14. Therefore, it is possible to reliably prevent a reduction in sensitivity of the X-ray detector 14.

  In the above-described embodiment, the X-ray detector 14 is moved together with the support member 18 so that the X-ray tube 12 and the X-ray detector 14 are not opposed to each other. May be moved together with the collimator 13 and the column 16. Alternatively, the X-ray tube 12 and the X-ray detector 14 may not be opposed to each other by moving both the X-ray tube 12 and the X-ray detector 14.

  However, as shown in FIGS. 1 to 3, in the state where the surface of the top plate 11 is arranged in the horizontal direction, the X-ray tube 12 or the X-ray detector 14 is arranged below the top plate 11. Moving the measured object reduces the possibility of collision between the X-ray tube 12 or the X-ray detector 14 and the operator, and enables safe aging. In the embodiment described above, since the X-ray detector 14 is disposed below the top plate 11, the X-ray detector 14 is moved. However, in an X-ray fluoroscopic imaging table having a configuration in which the X-ray tube 12 is disposed below the top plate 11, the X-ray tube 12 and the X-ray detector 14 are mutually connected by moving the X-ray tube 12. What is necessary is just to make it the state which does not oppose.

DESCRIPTION OF SYMBOLS 11 Top plate 12 X-ray tube 13 Collimator 14 X-ray detector 15 Main body 16 Support | pillar 18 Support member 21 Linear guide 22 Rack 23 Motor 24 Linear guide 25 Rack 26 Motor 27 Pinion 28 Pinion 30 Control part 31 Position detector 32 Position detector 38 Aging control section 39 Operation section M Subject

Claims (2)

A top plate, an X-ray tube that irradiates a subject placed in front of the top plate with X-rays, and an X-ray that is emitted from the X-ray tube and passes through the subject An X-ray fluoroscopic imaging table equipped with a detector,
An X-ray tube moving mechanism for moving the X-ray tube along the surface of the top plate;
An X-ray detector moving mechanism for moving the X-ray detector along the surface of the top plate;
An operation unit for instructing the X-ray tube to execute aging;
When an instruction to execute aging is given to the operation unit, at least one of the X-ray tube or the X-ray detector is moved by driving the X-ray tube moving mechanism or the X-ray detector moving mechanism. Thereby, the control part which arrange | positions the said X-ray tube and the said X-ray detector in the position which does not mutually oppose,
An X-ray fluoroscopic imaging table characterized by comprising: The X-ray fluoroscopic table according to claim 1,
An X-ray fluoroscopic table for moving the X-ray tube or the X-ray detector arranged below the top plate when an instruction to execute aging is given to the operation unit.