JP2018175347A - X-ray apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray apparatus capable of quickly moving a subject to an accurate position for roentgenography without making an impact thereon when a top board on which the subject is placed, is moved manually by an operator.SOLUTION: An X-ray apparatus 100 includes: an X-ray tube 2 applying an X ray to a subject 10; an FPD 3 for detecting the X ray transmitting through the subject 10; a top board 1 on which the subject 10 is placed; a support part 4 for horizontally-movably supporting the top board 1; a movement regulation part 41 regulating movement of the top board 1 with respect to the support part 4; and a control part 5 controlling the movement regulation part 41 to regulate the movement of the top board 1 with respect to the support part 4. When an operator manually moves the top board 1 to a target position, the control part 5 is configured to cause the movement regulation part 41 to regulate the movement of the top board 1 in an opposite direction of the target position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an X-ray imaging apparatus.

  Conventionally, an X-ray imaging apparatus is known (see, for example, Patent Document 1).

  The X-ray diagnostic apparatus (X-ray imaging apparatus) disclosed in Patent Document 1 includes an X-ray emitter, an X-ray detector, and a bed on which a subject is placed. This X-ray diagnostic apparatus is configured to control the brake in accordance with the distance between the target position and the current position when moving the X-ray emitter and the X-ray detector.

Japanese Patent Application Publication No. 2007-136201

  In the X-ray diagnostic apparatus of Patent Document 1, since the brake is applied based on the distance, the brake is applied when approaching the target position. However, in order to move quickly by manual movement, it is not desirable to apply the brake to the vicinity of the target position. Further, in the X-ray diagnostic apparatus of Patent Document 1 above, since the control is to turn the brake on and off, the brake is applied to the extent that it will stop when the distance to the target position becomes constant. When trying to move the bed to be placed, there is a risk that an impact may be transmitted to the subject.

  The present invention has been made to solve the problems as described above, and one object of the present invention is to move an X-ray when an operator manually moves a top plate on which a subject is placed. It is an object of the present invention to provide an X-ray imaging apparatus capable of rapidly moving a subject without giving an impact to an accurate position for imaging.

  In order to achieve the above object, an X-ray imaging apparatus according to one aspect of the present invention includes an X-ray irradiator for irradiating an X-ray to a subject, an X-ray detector for detecting an X-ray transmitted through the subject A top plate on which a subject is placed, a support portion that supports the top plate to be movable in the horizontal direction, a movement restricting portion that restricts the movement of the top plate relative to the support portion, and a top against the support portion by the movement restriction portion And a control unit that controls restriction of movement of the plate, and the control unit is configured to move movement of the top plate in the direction opposite to the target position when the operator manually moves the top plate to the target position. Are configured to be regulated.

  In the X-ray imaging apparatus according to one aspect of the present invention, as described above, when the operator manually moves the top plate to the target position, the movement restricting portion moves the head plate in the direction opposite to the target position. Provide a control unit that regulates As a result, when the operator manually moves the top in a direction opposite to the target position, the movement of the top can be made heavier, so the operator can easily move the top. By moving in the direction, the position of the top can be guided to the target position. In addition, since the movement of the top is not restricted to the vicinity of the target position by the amount of movement toward the target position, the top can be moved quickly when manually moved. Further, even when the distance to the target position becomes constant, the top plate is not restricted to a degree of stopping, so that it is possible to suppress the transmission of the shock to the subject. As a result, when the top plate on which the subject is placed is moved manually by the operator, the subject can be quickly moved to an accurate position for X-ray imaging without applying an impact. In addition, since it is not necessary to irradiate and see through X-rays for alignment, it is possible to suppress an increase in exposure to the subject.

  In the X-ray imaging apparatus according to the aforementioned aspect, preferably, the movement restricting portion restricts the first restriction for restricting movement of the top plate relative to the support portion, and restricts the movement of the top plate relative to the support portion with difficulty. And the control unit controls the movement of the top plate in the direction opposite to the target position by controlling the movement restriction unit to perform the second restriction. It is configured to According to this structure, when the top plate is restricted from moving in the direction opposite to the target position, the top plate can be prevented from being locked and unable to move, so that the top plate can be moved to the target position. It is possible to suppress the top plate from moving when trying to move the

  In this case, preferably, the movement restricting portion includes an electromagnet, and by switching the energization state of the electromagnet, the movement restricting portion can be switched to the state of the first restriction, the state of the second restriction, and the state of not performing restriction. Is configured. According to this structure, by switching the energization state of the electromagnet, it is possible to easily switch the restriction state of the movement of the top plate by the movement restriction unit.

  In the configuration in which the movement restriction unit includes the electromagnet, preferably, the movement restriction unit is switched to the first restriction state by switching the energization state of the electromagnet to the non-energization state, and setting the first energization state. It is configured to be switched to a state not performing regulation, and to be switched to a state of second regulation by setting it to a second energization state in which the amount of energization per unit time is smaller than that of the first energization state. According to this structure, by reducing the amount of current supplied to the electromagnet per unit time, from a state in which the movement is not restricted to a state in which the top plate is difficult to move with respect to the support portion Since it is possible to switch, it is possible to more easily switch the restriction state of the movement of the top plate by the movement restriction unit.

  In the configuration in which the movement restricting part can perform the first restriction and the second restriction, preferably, the movement restricting part makes the top move more easily than the first restriction, and the ceiling is more than the state in which the restriction is not performed. It is possible to perform a third restriction in which the board is difficult to move, and the control unit moves the top board toward the target position when the top board approaches within a predetermined distance from the target position. It is comprised so that it may regulate by the 3rd regulation of a movement control part. According to this structure, since the top board can be prevented from passing the target position, the top board can be smoothly moved to the target position.

  In the X-ray imaging apparatus according to the above aspect, preferably, the control unit sets the movement restricted area for restricting the movement of the top board based on the current position relative to the support part of the top board and the target position. It is configured. According to this structure, the movement restriction area can be updated along with the movement of the top plate, so that the movement of the top plate in the direction of the departure position can be surely restricted.

  As described above, when the top plate on which the subject is placed is moved manually by the operator, the subject can be quickly moved to the correct position for X-ray imaging without applying an impact. .

FIG. 1 is a schematic view showing an entire configuration of an X-ray imaging apparatus according to an embodiment of the present invention. It is the top view which showed the top plate of the X-ray imaging apparatus by one Embodiment of this invention. FIG. 2 is a block diagram showing a control configuration of an X-ray imaging apparatus according to an embodiment of the present invention. It is a figure for demonstrating the movement area | region of the top plate of the X-ray imaging apparatus by one Embodiment of this invention. It is a figure for demonstrating the relationship between regulation of the top plate of the X-ray imaging apparatus by one Embodiment of this invention, and an electric current amount. It is a figure showing the 1st operation example of movement of the top plate of the X-ray imaging device by one embodiment of the present invention. It is the figure which showed the 2nd operation example of movement of the top plate of the X-ray imaging apparatus by one Embodiment of this invention. It is a figure showing the 3rd operation example of movement of the top plate of the X-ray imaging device by one embodiment of the present invention.

  Hereinafter, an embodiment of the present invention will be described based on the drawings.

(Configuration of X-ray imaging apparatus)
The entire configuration of an X-ray imaging apparatus 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

  As shown in FIGS. 1 and 2, the X-ray imaging apparatus 100 according to the present embodiment is configured to be capable of performing X-ray imaging while relatively moving the subject 10 placed on the top 1 There is. The X-ray imaging apparatus 100 includes, for example, an angiography apparatus which radiographs a blood vessel using a contrast agent. Further, as shown in FIG. 1, the X-ray imaging apparatus 100 includes a top plate 1, an X-ray tube 2, an FPD (flat panel detector) 3, a support 4, a controller 5, and an operation switch 6. Is equipped. The X-ray tube 2 is an example of the “X-ray irradiation unit” in the claims, and the FPD 3 is an example of the “X-ray detection unit” in the claims.

  The X-ray imaging apparatus 100 is configured to perform X-ray imaging of the subject 10 (human body) lying on the table 1. Specifically, the X-ray irradiated from the X-ray tube 2 disposed below the table 1 and transmitted through the subject 10 is detected by the FPD 3 and an X-ray image is taken. . Further, the X-ray imaging apparatus 100 is configured to capture an X-ray image while moving the subject 10 (top 1) relative to the X-ray tube 2 and the FPD 3.

  The top 1 is configured to place the subject 10 thereon. Specifically, the top 1 has an upper surface which spreads in the horizontal direction (X direction and Y direction). The subject 10 is placed on the upper surface of the top 1 in a lying state. Further, as shown in FIG. 2, the table-top 1 is configured to be movable relative to the X-ray tube 2 and the FPD 3 in a state in which the subject 10 is laid (placed). Specifically, the table-top 1 is configured to be movable in the body axis direction (X direction) of the subject 10 lying down and in the direction (Y direction) orthogonal to the body axis direction of the subject 10. The top 1 is supported movably in the horizontal direction by a support 4 disposed below. Moreover, the table-top 1 is configured to be moved manually by the operator. As shown in FIG. 4, the top 1 is configured to be movable in a predetermined top movement area in the X direction and the Y direction. In addition, the top-plate movement area | region shown in FIG. 4 has shown the movement area | region of a reference point by making one point of the top 1 into a reference point.

  As shown in FIG. 1, the X-ray tube 2 is disposed to face the FPD 3 across the top plate 1. Further, the X-ray tube 2 applies X-rays to the subject 10 lying on the table 1. Moreover, the X-ray tube 2 is configured to be able to adjust the intensity and the irradiation range of the X-ray to be generated.

  The FPD 3 is configured to detect X-rays which are irradiated by the X-ray tube 2 and transmitted through the subject 10. The FPD 3 is configured to capture an X-ray image based on the detected X-ray. Specifically, the FPD 3 is configured to convert the detected X-ray into an electrical signal. Further, the information of the X-ray converted into the electrical signal is transmitted to an image processing unit (not shown). The X-ray tube 2 and the FPD 3 are supported by a C-arm.

  The X-ray tube 2 and the FPD 3 are configured to start imaging of an X-ray image based on an instruction of imaging start input from an operator. That is, based on the operator's instruction to start imaging, the X-ray tube 2 emits X-rays, and the FPD 3 detects X-rays. Further, the X-ray tube 2 and the FPD 3 are configured to end or stop the imaging of the X-ray image based on an instruction to end or stop imaging input from the operator. That is, based on the operator's instruction to end or stop imaging, the X-ray irradiation from the X-ray tube 2 is stopped and the detection of the X-ray by the FPD 3 is stopped.

  The support portion 4 is configured to support the top 1 movably in the horizontal direction (XY direction). Moreover, the support part 4 contains the movement control part 41 and the top-plate position detection part 42, as shown in FIG. The support 4 supports the top 1 movably in the X direction along a rail extending in the X direction. Moreover, the support part 4 supports the top 1 movably in the Y direction along a rail extending in the Y direction.

  The movement restricting portion 41 includes, as shown in FIG. 3, an X-direction electromagnetic lock 41a, a Y-direction electromagnetic lock 41b, and a rotational direction electromagnetic lock 41c. In addition, the movement restriction unit 41 includes a permanent magnet and an electromagnet. The movement restricting portion 41 is configured to restrict movement of the top 1 with respect to the support portion 4 by controlling energization of the electromagnet.

  The top position detection unit 42 is configured to detect the horizontal position of the top 1 with respect to the support 4. The tabletop position detection unit 42 includes, for example, a potentiometer, an encoder, and the like.

  The movement restricting portion 41 locks the top plate 1 so as not to move relative to the support portion 4 by the magnetic force of the permanent magnet. The movement restricting portion 41 is configured to offset the magnetic force of the permanent magnet by energizing the electromagnet and weaken the restriction of the movement of the top plate 1 with respect to the support portion 4. That is, when the electromagnet is not energized, the movement of the top 1 relative to the support 4 is restricted (locked). The X direction electromagnetic lock 41 a is configured to restrict the movement of the top 1 in the X direction. The Y direction electromagnetic lock 41 b is configured to restrict the movement of the top 1 in the Y direction. The rotation direction electromagnetic lock 41 c is configured to restrict the movement of the top plate 1 in the rotation direction.

  In addition, the movement restricting portion 41 controls the first restriction that restricts the movement of the top 1 relative to the support 4 and the second restriction that restricts the movement of the top 1 relative to the support 4. It is configured to be possible. In addition, the movement restricting portion 41 is configured to be capable of performing the third restriction in which the top 1 can move more easily than the first restriction, and the top 1 can not easily move in a state in which the restriction is not performed. As shown in FIG. 5, in the first regulation, the movement of the top 1 is in the locked state. In the second regulation, the manual operation force of the top 1 becomes heavy. In the third regulation, the manual operation force of the top 1 becomes slightly heavy. In the state where the regulation is not performed, the manual operation force of the top 1 becomes light.

  In addition, the movement restricting portion 41 can be switched to the state of the first restriction, the state of the second restriction, the third restriction state, and the state of not performing the restriction by switching the energization state to the electromagnet. It is configured. As shown in FIG. 5, the movement restricting unit 41 is switched to the first restriction state by setting the energization of the electromagnet to I 0 (= 0). In addition, the movement restriction unit 41 can switch to a state where restriction is not performed by setting the energization of the electromagnet to I1 (first energization state). Here, the first energized state is an energized state necessary to cause the electromagnet to generate a magnetic field having the same magnitude as that of the permanent magnet in the opposite direction. Further, the conduction state may be controlled by the current value or may be controlled by PWM (pulse width modulation) control.

  In addition, the movement restriction unit 41 is switched to the second restriction state by setting the energization of the electromagnet to I2 (second energization state). The second energization state is an energization state in which the amount of energization per unit time is smaller than that in the first energization state. For example, the second conduction state is a state in which the amount of conduction is approximately half that of the first conduction state. In addition, the movement restriction unit 41 is switched to the third restriction state by setting the energization of the electromagnet to I3 (third energization state). The third energization state is an energization state in which the amount of energization per unit time is smaller than that in the first state of energization and the amount of energization per unit time is larger than that in the second state of energization. For example, the third conduction state is a state of about 3⁄4 of the first conduction state.

  The control unit 5 is configured to control each unit of the X-ray imaging apparatus 100. Specifically, the control unit 5 is configured to control the X-ray irradiation by the X-ray tube 2. Further, the control unit 5 is configured to control the imaging of the X-ray image of the FPD 3. Further, the control unit 5 is configured to control the regulation of the movement of the top 1 with respect to the support unit 4 by the movement regulating unit 41.

  As shown in FIG. 3, control unit 5 includes, as a control configuration, electromagnetic lock current control unit 51, target position determination unit 52, restriction control determination unit 53, and top plate position determination unit 54. There is. Further, the control unit 5 includes a CPU (central processing unit), a memory, and the like as a hardware configuration.

  The electromagnetic lock current control unit 51 is configured to control the current supplied to the electromagnet of the movement restricting unit 41. The target position determination unit 52 is configured to acquire target position information of the top 1 based on a photographing program, image information photographed in advance, an operation of the operator, and the like. For example, in the case of DSA (digital subtraction angiography) imaging, a position of interest previously captured by radiography is acquired as a target position. Further, the target position determination unit 52 is configured to acquire, as a target position, the position of the table 1 corresponding to the position at which the subject 10 is to be subjected to X-ray imaging. Further, the target position determination unit 52 is configured to provide the restriction control determination unit 53 with the acquired target position information of the top 1.

  The restriction control determination unit 53 is configured to set the movement restriction area based on the current position information of the top 1 and the target position information. Further, the restriction control determination unit 53 is configured to restrict the movement of the top 1 in the movement restriction area. As shown in FIG. 6, the movement restriction area includes a second restriction area in which the second restriction is performed and a third restriction area in which the third restriction is performed.

  The tabletop position determination unit 54 is configured to acquire current position information of the tabletop 1 based on the position detection of the tabletop 1 by the tabletop position detection unit 42. Further, the top position detection unit 42 is configured to provide the acquired current position information of the top 1 to the restriction control determination unit 53.

  Here, in the present embodiment, when the operator manually moves the top 1 to the target position, the control 5 restricts the movement of the top 1 in the direction opposite to the target position by the movement restriction unit 41. It is configured to Specifically, the control unit 5 acquires the moving direction of the top 1 based on the current position of the top 1 by the top position detection unit 42. The control unit 5 is configured to control the current supplied to the electromagnet of the movement restricting unit 41 to restrict the movement of the table 1 when the movement direction of the table 1 is opposite to the target position. ing.

  Further, in the present embodiment, the control unit 5 is configured to restrict the movement of the top 1 in the direction opposite to the target position by controlling the movement restriction unit 41 to perform the second restriction. . Further, the control unit 5 is configured to restrict the movement of the top 1 toward the target position by the third restriction of the movement restricting part 41 when the top 1 approaches the target position within a predetermined distance. It is done.

  Further, the control unit 5 is configured to set a movement restricted area for restricting the movement of the top 1 based on the current position of the top 1 relative to the support 4 and the target position. Specifically, as shown in FIG. 6, the control unit 5 sets an area in the direction opposite to the direction toward the target position with respect to the current position in the X direction as the movement restriction area. Further, the control unit 5 sets an area beyond the target position in the X direction as a movement restriction area. Further, the control unit 5 sets an area in the direction opposite to the direction toward the target position with respect to the current position in the Y direction as the movement restriction area. Further, the control unit 5 sets an area beyond the target position in the Y direction as the movement restriction area. That is, as the top 1 approaches the target position, the movement restriction area becomes larger.

  The operation switch 6 is configured to be operated by the operator. The operation switch 6 is connected to the control unit 5 and configured to input an operation of the operator to the control unit 5. When the operation switch 6 is off, the movement of the top 1 is locked. That is, when the operation switch 6 is OFF, the movement of the top 1 is restricted by the first restriction by the movement restriction unit 41. When the operation switch 6 is ON, the movement lock of the top 1 is released. Thus, the operator can manually move the top 1 with respect to the support 4.

(First operation example)
Next, with reference to FIG. 6, a first operation example of the movement of the top plate by the X-ray imaging apparatus 100 of the present embodiment will be described.

  The control unit 5 sets the target position with respect to the departure position of the top 1 and sets the second restriction area based on the current position (departure position) of the top 1 and the target position. Further, based on the target position of the top 1, the control unit 5 sets a third restriction area within a distance of a predetermined range from the target position. Then, with the movement of the table 1, the control unit 5 updates the movement restriction area so that the area opposite to the target position becomes the second restriction area with respect to the current position. When the table-top 1 enters the third restriction area, the control unit 5 restricts the movement of the table-top 1 by the movement restriction unit 41 by the third restriction, and controls the table 1 to move by decelerating. . When the table-top 1 reaches the target position, the control unit 5 restricts the movement of the table-top 1 by the movement restricting unit 41 by the first restriction, and brings it into a locked state.

(Second operation example)
Next, with reference to FIG. 7, a second operation example of the movement of the top by the X-ray imaging apparatus 100 of the present embodiment will be described. In the second operation example, an operation example in which the table-top 1 moves in the X direction after moving in the Y direction will be described.

  The control unit 5 locks the movement of the top 1 in the X direction so that the top 1 moves only in the Y direction from the departure position to the position P1. In addition, the control unit 5 restricts the movement in the Y direction opposite to the direction from the current position to the position P1 by the second restriction by the movement restriction unit 41. The position P1 is the same position as the departure position in the X direction, and the same position as the target position in the Y direction. When the table-top 1 reaches the position P1, the control unit 5 locks the movement of the table-top 1 in the Y-direction so that the table-top 1 moves only in the X-direction. In addition, the control unit 5 restricts the movement in the X direction opposite to the direction from the current position toward the target position by the second restriction by the movement restriction unit 41. When the table-top 1 reaches the target position, the control unit 5 restricts the movement of the table-top 1 by the movement restricting unit 41 by the first restriction, and brings it into a locked state.

(Third operation example)
Next, with reference to FIG. 8, a third operation example of the movement of the top plate by the X-ray imaging apparatus 100 of the present embodiment will be described. In the third operation example, an operation example of restricting the top 1 to move along the path will be described.

  The control unit 5 acquires the path of the top 1 from the departure position to the final target position, and sets the second restriction area so that the top 1 moves along the path. That is, in the third operation example, the direction of the target position is the direction from the current position of the top 1 toward the final target position along the route. The control unit 5 restricts the movement out of the direction along the path of the top 1 according to the second restriction by the movement restriction unit 41. In addition, the control unit 5 restricts the movement of the top 1 in the opposite direction on the path according to the second restriction by the movement restriction unit 41. When the table-top 1 reaches the final target position, the control unit 5 restricts the movement of the table-top 1 by the movement restricting unit 41 by the first restriction, and brings it into the locked state.

(Effect of the embodiment)
In the present embodiment, the following effects can be obtained.

  In the present embodiment, as described above, when the operator manually moves the top 1 to the target position, the control unit controls the movement of the top 1 in the direction opposite to the target position by the movement restriction unit 41. Set 5 Thus, when the operator manually moves the top 1 in a direction opposite to the target position, the movement of the top 1 can be made heavier, so the operator can move the top 1 The position of the table-top 1 can be guided to the target position by moving it in such a way as to be easy to move. Moreover, since the movement of the top 1 is not restricted to the vicinity of the target position by the amount of movement toward the target position, the top 1 can be moved quickly when manually moved. Further, even when the distance to the target position becomes constant, the restriction to the extent that the table-top 1 stops is not restricted, so that the transmission of an impact to the subject 10 can be suppressed. Thereby, when the top plate 1 on which the subject 10 is placed is moved manually by the operator, the subject 10 can be quickly moved to an accurate position for X-ray imaging without applying an impact. it can. Moreover, since it is not necessary to irradiate and see X-rays for alignment, it is possible to suppress an increase in the exposure to the subject 10.

  Further, in the present embodiment, as described above, the first restriction for restricting the movement restricting portion 41 so that the table-top 1 can not move with respect to the support portion 4 and the movement of the table-top 1 with respect to the support portion 4 It is possible to perform the second regulation which is difficult to regulate. Further, by controlling the control unit 5 to perform the second restriction of the movement restriction unit 41, the movement of the top 1 in the direction opposite to the target position is restricted. Thereby, when restricting the movement of the top 1 in the direction opposite to the target position, the top 1 can be restrained from being locked and unable to move, so that the top 1 can be directed to the target position. When trying to move, it can suppress that the top 1 does not move.

  Further, in the present embodiment, as described above, by switching the energization state of the electromagnet, the movement restricting portion 41 changes the state of the first restriction, the state of the second restriction, and the state of not performing the restriction. Configure to be switched. Thus, by switching the energization state of the electromagnet, it is possible to easily switch the regulation state of the movement of the top 1 by the movement regulation unit 41.

  Further, in the present embodiment, as described above, the movement restricting portion 41 is switched to the state of the first restriction by changing the state of energization of the electromagnet to the state of not supplying electricity, and restricting the state of the movement restriction unit 41 by setting the first energization Is switched to the second restriction state by switching to the second conduction state in which the amount of conduction per unit time is smaller than that in the first conduction state. Thus, by reducing the amount of current supplied to the electromagnet per unit time, switching from a state in which movement is not restricted to a state in which movement of the top 1 relative to the support 4 is restricted to a second restriction state in which movement is restricted. Therefore, it is possible to more easily switch the restriction state of the movement of the top 1 by the movement restriction unit 41.

  Further, in the present embodiment, as described above, the movement restricting portion 41 performs the third restriction in which the top 1 moves more easily than the first restriction, and the top 1 does not move more easily than the state in which the restriction is not performed. It is possible to configure. Further, the control unit 5 is configured to restrict the movement of the top 1 toward the target position by the third restriction of the movement restricting part 41 when the top 1 approaches the target position within a predetermined distance. Do. Thereby, it is possible to suppress that the table-top 1 passes the target position, so that the table-top 1 can be smoothly moved to the target position.

  Further, in the present embodiment, as described above, the control unit 5 sets the movement restricted area for restricting the movement of the top 1 based on the current position of the top 1 relative to the support 4 and the target position. Configure as. Thus, the movement restricted area can be updated along with the movement of the table 1, so that the movement of the table 1 back in the direction of the departure position can be surely restricted.

(Modification)
It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is indicated not by the description of the embodiments described above but by the claims, and further includes all modifications (modifications) within the meaning and scope equivalent to the claims.

  For example, although an example in which the subject is a human is shown in the above embodiment, the present invention is not limited to this. In the present invention, the subject may be an organism other than a human being or may be an entity. For example, the X-ray imaging apparatus of the present invention may be used for medical equipment such as a roentgen apparatus, or may be used for industrial equipment such as an X-ray inspection apparatus (nondestructive inspection apparatus). In addition, the X-ray imaging apparatus of the present invention may be used in an analysis device or the like.

  Moreover, although the example which image | photographs the to-be-read object lying on the top in the said embodiment was shown, this invention is not limited to this. In the present invention, the subject in a state of standing up to the top (standing position) may be photographed.

  Moreover, although the example of the structure which the X-ray imaging apparatus of this invention performs X-ray imaging was shown in the said embodiment, this invention is not limited to this. With the X-ray imaging apparatus of the present invention, X-ray fluoroscopy may be performed to perform fluoroscopic inspection and the like.

  Moreover, although the example of the structure used for the X-ray imaging apparatus of this invention used for the angiography apparatus which radiographs a blood vessel using a contrast agent was shown in the said embodiment, this invention is not limited to this. The X-ray imaging apparatus of the present invention may be used to radiograph a site other than a blood vessel.

  In the above embodiment, the example of the C-arm type X-ray imaging apparatus in which the X-ray tube (X-ray irradiation unit) and the FPD (X-ray detection unit) are supported by the support unit has been described. Is not limited to this. For example, the present invention may be applied to an island type X-ray imaging apparatus.

  Moreover, although the example of the structure to which a top plate is manually moved with respect to a support part was shown in the said embodiment, this invention is not limited to this. In the present invention, the top plate may be automatically moved with respect to the support in addition to the manual operation of the operator.

1 Top plate 2 X-ray tube (X-ray irradiation unit)
3 FPD (X-ray detector)
Reference Signs List 4 support unit 5 control unit 10 object 41 movement restriction unit 100 X-ray imaging apparatus

Claims (6)

An X-ray irradiator for irradiating the subject with X-rays;
An X-ray detection unit that detects X-rays transmitted through the subject;
A top plate on which the subject is placed;
A supporting portion which supports the top plate movably in the horizontal direction;
A movement restricting unit that restricts the movement of the top plate with respect to the support unit;
And a control unit that controls the movement restriction unit to restrict movement of the top plate relative to the support unit,
The control unit is configured to restrict movement of the top plate in a direction opposite to the target position by the movement restriction unit when the operator manually moves the top plate to a target position. X-ray imaging device. The movement restriction unit performs a first restriction that restricts the top plate from moving with respect to the support portion and a second restriction that restricts the top plate from moving easily with respect to the support portion. Is configured to be
The control unit is configured to restrict movement of the top plate in the direction opposite to the target position by controlling the movement restriction unit to perform the second restriction. X-ray imaging device.   The movement restricting unit includes an electromagnet, and is configured to be switched between the state of the first restriction, the state of the second restriction, and the state of not performing the restriction by switching the energization state of the electromagnet. The X-ray imaging apparatus according to claim 2.   The movement restricting part is switched to the state of the first restriction by deactivating the energization state of the electromagnet, and is switched to the state of not regulating by the first energizing state. 4. The X-ray imaging apparatus according to claim 3, wherein the second regulation state is configured to be switched to the second regulation state by setting the second energization state in which the amount of energization per unit time is smaller than that of the one energization state. The movement restricting portion is configured to be capable of performing a third restriction in which the top is more easily moved than the first restriction, and the top is less easily moved than a state in which the restriction is not performed.
The control unit is configured to restrict movement of the top plate toward the target position according to the third restriction of the movement restriction unit when the top plate approaches the target position within a predetermined distance. The X-ray imaging apparatus of any one of Claims 2-4.   The control unit is configured to set a movement restricted area for restricting movement of the top board based on a current position of the top board relative to the support part and a target position. The X-ray imaging apparatus according to any one of the above.

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