JP2013244145A - X-ray imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus allowing the reduction of the size of the apparatus, and easily coping with various imaging target regions.SOLUTION: An X-ray imaging apparatus includes: a turn arm 5 having an X-ray irradiation part and an X-ray detection part disposed to the head of a subject oppositely to each other; a holding frame 4 holding the turn arm; an elevating body 3 supporting the holding frame 4; and a strut 2 vertically movably supporting the elevating body 3. The elevating body 3 has a beam generation device 100 emitting a beam to the head of the subject. The beam generation device includes: a base installed to the elevating body; a first beam irradiation part 111 fixed to a reference position of the base; and a second beam irradiation part 112 provided in the base vertically movably to the first beam irradiation part 111. The beam irradiation part 112 is moved to a prescribed position, and irradiates position beams corresponding to a plurality of imaging regions.

Description

  The present invention relates to an X-ray imaging apparatus that can be suitably used for dentistry, otolaryngology, and the like, and can check an imaging target region in advance.

  Some X-ray imaging apparatuses used in dentistry, otolaryngology, etc. can position and hold a patient's head and share plane tomography and curved tomography. In such a device, it is necessary to position a portion separated vertically in the center of the irradiation field, such as a temporomandibular joint located above and a lower jaw tip located below.

  As a device for positioning the patient's head, for example, a chin rest on which the patient's lower jaw is placed, a forehead pressing member that contacts the frontal surface of the patient's head, and both heads of the patient And a pair of temporal head pressing members.

  After moving the patient frame etc. holding the chin rest up and down according to the patient's height, etc., the chin rest is displaced in the patient's front-rear direction, and the frontal face surface of the patient's head is placed on the front head pressing member. Imaging is performed after the patient is positioned so that the patient's imaging region coincides with the X-ray irradiation surface by pressing the both sides with the temporal pressing member.

  When positioning the patient as described above, as shown in FIG. 20, the patient's head is irradiated with a positioning beam. The patient's head is positioned using this beam. The positioning beam includes a median beam L11 used for positioning with the midline of the subject O, a beam L12 indicating the Frankfurt plane, a beam L14 indicating the upper limit region of a large-range imaging mode of CT tomography, and a CT tomography. A beam L15 indicating an upper limit area of an imaging mode in a small imaging range, a beam L16 indicating a lower limit area of CT tomography, and a beam L13 indicating a tomographic area at the time of panoramic tomography are irradiated.

  These beams L12, L13, L14, L15, and L16 are irradiated with beams according to the selected mode. That is, a beam corresponding to an imaging target region corresponding to panoramic tomography and CT tomography is irradiated.

  An X-ray imaging apparatus that can confirm in advance the imaging range to be imaged has been proposed (see, for example, Patent Document 1). In this apparatus, three beam generators are attached to a film cassette, and three beams indicating an imaging range in which curved tomography or planar tomography is performed are projected onto the patient's head. Further, in this apparatus, in addition to these three beams, a beam indicating the Frankfurt plane is projected onto the patient's head using a beam generator different from the three beam generators.

  In the X-ray imaging apparatus described in Patent Document 1 described above, three beam generators for generating a beam for indicating the imaging range and beam generation for generating a horizontal beam for indicating the Frankfurt plane And a total of four beam generators are required.

  The present applicant has proposed a position beam generator that reduces the number of beam generators to three and irradiates a beam for indicating an imaging range and a horizontal beam indicating a Frankfurt plane. The position beam generator 200 will be described with reference to FIGS. 21 and 22. As shown in FIGS. 21 and 22, the position beam generating apparatus 200 is attached to an elevating body that supports a swivel arm including an X-ray generator and an X-ray detector. Beam generators 201, 202, and 203 for irradiating a laser beam are attached to the base 210 corresponding to the CT imaging region. For example, a beam corresponding to a small-range imaging mode and a large-range imaging mode is irradiated as a CT tomography mode. The lowermost beam generator 201 emits a beam L16 indicating a lower limit region of CT tomography. The intermediate beam generator 202 emits a beam L15 indicating the upper limit region of the small range imaging mode. The uppermost beam generator 203 emits a beam L14 indicating the upper limit region of the large range imaging mode.

  These bases 210 are supported so as to be movable up and down with respect to a slider shaft 230 attached to an elevating body or the like. A ball bush that engages with the ball screw 231 is provided inside the base 210. A ball screw 231 and a motor 232 for rotating the ball screw 231 are provided on the lifting body main body and the like. The base 210 is moved up and down by rotating the motor 231 and rotating the ball screw 231. By moving the base 210 up and down, the three beam generators 201, 202, and 203 can be moved up and down integrally.

  By selecting the CT tomography mode, beams are emitted from two of the three beam generators 201, 202, and 203 described above. When the small range imaging mode is selected, beams are emitted from the beam generators 201 and 202, and when the large range imaging mode is selected, beams are emitted from the beam generators 201 and 203.

  When the panoramic tomography mode is selected and the beam L12 for displaying the Frankfurt plane is emitted, the beam is emitted from the uppermost beam generator 203, and the base 210 is moved up and down to the patient's ears. Match.

JP-A-8-238238

  By arranging the three beam generators 201, 202, 203 on the base 210 and moving the base 210 up and down, beams corresponding to the two planes to be imaged in the Frankfurt plane in panoramic tomography and CT tomography. Can be generated. However, in this apparatus, the beam emitted from the beam generators 201, 202, and 203 can only indicate two imaging target regions.

  In addition, it is necessary to move the three beam generators 201, 202, 203 up and down together with the base 210, and it is necessary to make a large space for movement, and a driving device such as a motor for moving up and down is large. Turn into.

  Furthermore, in order to reduce costs, downsizing of the device is desired.

  It is an object of the present invention to provide an apparatus that can be reduced in size and can easily cope with various shooting target areas.

  The present invention relates to a revolving arm having an X-ray irradiating unit and an X-ray detecting unit arranged to face each other with respect to the head of a subject, a holding member for holding the revolving arm, and a support for the holding member. An X-ray imaging apparatus comprising: a support main body that performs fixing; and a subject holding device that fixes a subject's head; wherein the X-ray imaging apparatus performs X-ray imaging by rotating the swivel arm; A beam generating means for emitting a beam at the portion; the beam generating means; a base attached to the support body; a first beam generator fixed to a reference position of the base; and A second beam generator provided on the base so as to be movable up and down with respect to the beam generator; the second beam generator is moved to a predetermined position; and a position beam corresponding to a plurality of imaging regions It is characterized by irradiating.

  The subject holding device may have a chin rest, and the reference position of the base may be configured to match the position of the chin rest at the time of introduction of the subject holding device of the subject.

  Further, the first beam generator emits a beam indicating a lower limit region in the case of CT tomography, and the second beam generator emits a beam indicating an upper limit region in the case of CT tomography. Can be configured.

  The second beam generator may be configured to emit a beam indicating the Frankfurt plane in the case of panoramic tomography.

  The present invention also provides a swing arm having an X-ray irradiator and an X-ray detector disposed opposite to each other with respect to the head of the subject, a holding frame for holding the swing arm, and the holding frame. An X-ray imaging apparatus comprising: an elevating body that supports the subject; a subject holding device that fixes the head of the subject; and a column that supports the elevating body so as to be movable up and down. And a beam generating means for emitting a beam to the head of the subject. The beam generating means includes a base attached to the elevating body and a first beam generating fixed to a reference position of the base. And a second beam generator provided on the base so as to be movable up and down with respect to the first beam generator, moving the second beam generator to a predetermined position, and Irradiate the position beam corresponding to the imaging area And wherein the Rukoto.

  A patient frame may be attached to the elevating body, and the subject holding device may be attached to the distal end of the patient frame so as to be movable up and down independently of the patient frame.

  According to the present invention, two beam generators can cope with a plurality of imaging target areas in CT tomography, and can emit a beam for the Frankfurt plane in panoramic tomography. For this reason, it is possible to reduce the size of the device, reduce the number of beam generators to two, and reduce the cost. In addition, by reducing the size of the device, the installation space can be reduced, and the degree of freedom for the installation location in the X-ray imaging apparatus is increased. And the drive device, such as a motor for raising and lowering, can also be reduced in size.

It is a block diagram explaining the basic composition of the X-ray imaging apparatus by this invention. 1 is a front view of an X-ray imaging apparatus according to the present invention. 1 is a side view of an X-ray imaging apparatus according to the present invention. It is a top view of the X-ray imaging apparatus by this invention, (a) is the state which set the operation panel to the 1st position substantially parallel with respect to a patient frame, (b) is the operation panel with respect to a patient frame. The state set to the second position substantially orthogonal is shown. It is a front view which shows the beam generator used for this invention. It is a side view which shows the beam generator used for this invention. It is a front view which shows the beam generator used for this invention, and has shown the movement area | region of the beam generator. FIG. 3 is a front view of the X-ray imaging apparatus according to the present invention, partly cut away to illustrate the lifting body moving means portion. It is a front view which shows the engagement state of the raising / lowering main body and support | pillar of the X-ray imaging apparatus by this invention. It is a schematic sectional drawing which shows the engagement state of the raising / lowering main body and support | pillar of the X-ray imaging apparatus by this invention. It is a top view which shows the patient frame and subject holding apparatus of the X-ray imaging apparatus by this invention, (a) is the state which set the operation panel to the 1st position substantially parallel with respect to a patient frame, b) shows a state in which the operation panel is set to a second position substantially orthogonal to the patient frame. It is a front view which shows the patient frame and subject holding device of the X-ray imaging apparatus by this invention. It is a side view which shows the patient frame and subject holding device of the X-ray imaging apparatus by this invention. It is a top view which shows the patient frame of the X-ray imaging apparatus by this invention, and the raising / lowering mechanism of a subject holding device. It is a front view which shows the patient frame of the X-ray imaging apparatus by this invention, and the raising / lowering mechanism of a subject holding device. It is a side view which shows the patient frame of the X-ray imaging apparatus by this invention, and the raising / lowering mechanism of a subject holding device. It is a schematic diagram which shows the beam irradiated to a subject, (a) has shown the beam at the time of panoramic tomography, (b) has each shown the beam at the time of CT tomography. It is a side view which shows the state which introduce | transduces and image | photographs a subject to the X-ray imaging apparatus by this invention. It is a side view which shows the state which introduce | transduces and image | photographs a subject to the X-ray imaging apparatus by this invention. It is a schematic diagram showing all the beams irradiated to a subject. It is a front view which shows the conventional beam generator. It is a side view which shows the conventional beam generator.

  Hereinafter, embodiments of an X-ray imaging apparatus that performs X-ray imaging of the maxillofacial surface of a subject (patient) O will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated in order to avoid duplication of description.

  FIG. 1 is a block diagram illustrating the basic configuration of the X-ray imaging apparatus. The X-ray imaging apparatus includes an X-ray irradiation unit 52 that irradiates a subject (patient) O with X-rays, an X-ray detection unit 53 that detects X-rays transmitted through the subject O, and an X-ray irradiation unit. 52 and the X-ray detection part 53 are provided with the revolving arm 5 arranged to face each other.

  The X-ray imaging apparatus basically has a panoramic tomography mode and a CT tomography mode. Further, a cephalometric mode (not shown) is added as necessary. The panoramic tomography includes the following modes: adult panoramic photography, pediatric panoramic photography, direct panoramic photography, temporomandibular joint lateral photography (TMJ4), temporomandibular joint front photography (TMJ2), and maxillary sinus photography. In the panoramic tomography, the X-ray irradiation unit 52 and the X-ray detection unit 53 perform tomography while horizontally moving and turning the revolving arm 5 so that a predetermined locus along the shape of the dental arch is drawn. Also, using the principle of tomosynthesis, it is possible to reconstruct an arbitrary focal plane image by acquiring a wide range of tomographic data in the jawbone from panoramic imaging.

  CT tomography is a maximum of dental imaging mode (D mode), implant imaging mode (I mode), upper and lower jaw imaging mode (A mode), panoramic mode (P mode), whole head imaging mode (F mode), etc. There are various shooting modes according to the effective field of view. CT tomography allows CT tomography of the head and neck region. Usually, a part or all of the tooth and jaw regions are mainly set as a plurality of target imaging regions (image reconstruction ranges) and are set alternatively. The photographing target region (image reconstruction range) is photographed while rotating the turning arm 5 around the photographing target region (image reconstruction range).

  Further, the cephalometric imaging includes a side imaging (LA) mode and a frontal imaging (PA) mode, and the cephalometric imaging is performed in a necessary mode.

  The X-ray imaging apparatus includes a subject holding device (head fixing portion) 7 that holds the maxillofacial surface of the subject O, a swing arm 5, a lifting body 3 that supports the swing arm 5, and a subject holding device ( A driving unit 160 for driving the head fixing unit 7) and a photographing apparatus main body control unit 170.

  The X-ray irradiation unit 52 includes an X-ray generator 52a including an X-ray tube or the like that irradiates X-rays, and a collimator 52b including a slit or the like that controls the spread of the X-ray beam. 53 is constituted by a cassette 53b provided with an X-ray detector 53a composed of a CCD sensor spread in two dimensions, an X-ray indirect conversion method (FPD: flat panel detector) sensor or the like. The cassette 53b is detachable from the X-ray detection unit 53, but the X-ray detector 53a may be fixedly provided on the X-ray detection unit 53 without using the cassette 53b.

  The drive unit 160 includes a turning axis position setting unit 161 that moves the turning axis 5c in the XY direction (horizontal direction) in order to move the turning axis 5c of the turning arm 5 to a position corresponding to the shooting mode at the time of shooting. The swing axis moving means 161 may be anything that moves in the X direction and the Y direction. For example, a configuration including an XY table that moves in the XY direction (horizontal direction), a configuration that includes a rotating shaft and a crank, and is movable in the X direction and the Y direction can be applied. When an XY table that moves in the XY direction (horizontal direction) is provided, the turning axis moving means 161 rotates the X axis motor, the Y axis motor that horizontally moves the turning axis 5 c of the turning arm 5, and the turning arm 5. And a turning motor of the turning shaft rotating means 162 provided on the XY table.

  First, the turning shaft 5c is set to coincide with the midline of the subject O. For example, during panoramic tomography, the turning shaft 5c of the turning arm 5 moves horizontally and rotates so as to draw a predetermined locus along the shape of the dental arch. During CT tomography, the turning shaft 5c of the turning arm 5 is moved to a predetermined position so that the turning arm 5 is turned around the target imaging region (image reconstruction range), and the turning shaft 5c is moved to that position. Rotates in a fixed state.

  The subject holding device (head fixing portion) 7 is not shown in FIG. 1 and the head fixing portion 70 for fixing the head of the subject O, but the subject O holds the grip. A pair of handles.

  The head fixing unit 70 includes a chin rest 73 for placing the jaw of the subject O and a side head holder 72 that opens and closes symmetrically for fixing the temporal region. If necessary, an ear rod (not shown) for fixing the outer ear can be provided on the head fixing portion 70.

  As will be described later, the X-ray imaging apparatus moves up and down as a support body in order to move the turning arm 5 and the subject holding device (head fixing portion) 7 to a predetermined height according to the subject O. An elevating body moving means 163 is supported by the main body 3 (see FIG. 2, FIG. 3, etc.), and the elevating body 3 moves up and down.

  The elevating body 3 is provided with a beam generating device 100 indicating an imaging target region, and a beam corresponding to the imaging mode is given to the subject O from the two beam generators 101 and 102 (see FIGS. 5 and 6). Irradiated.

  As will be described later, the beam generator 100 of this embodiment is configured such that the beam generator 102 located on the upper side is movable up and down. When the imaging mode is selected, the beam moving means 165 in the drive unit section 160 is driven, and the upper beam generator 102 moves to a predetermined position.

  Further, as will be described later, the X-ray imaging apparatus holds the subject O in a predetermined position by the subject holding device (head fixing unit) 7 and then the target imaging region (image reconstruction range) rr. Can be set. Further, the imaging region can be moved up and down as in the case where the imaging region is changed from the lower jaw region to the upper jaw region. At this time, in order to move the elevating body 3 up and down, the elevating body driving means 163 moves. The drive unit 160 includes a fixing mechanism moving unit 164 that moves the subject holding device (head fixing unit) 7. The fixing mechanism moving unit 164 synchronizes with the movement of the lifting body moving unit 163. It moves so as to keep the position of the subject holding device (head fixing part) 7 at a fixed position with respect to the position of the base 1 (see FIG. 2, FIG. 3, etc.).

  At the time of imaging, the pair of the X-ray irradiation unit 52 and the X-ray detection unit 53 are positioned so as to face each other with the oral cavity of the subject O interposed therebetween, and rotate around the oral cavity as a unit. Driven.

  The imaging apparatus main body control unit 170 includes a control device 171 that executes various control programs including a control program that controls the drive unit unit 160, an X-ray generation unit control unit 172 that controls the X-ray irradiation unit 52, and an X-ray. X-ray detection unit control means 173 for controlling the detection unit 53 is provided. The operation panel 8 includes a small liquid crystal panel and a plurality of operation buttons. In addition to the operation buttons, input means such as a keyboard, a mouse, and a touch panel can also be used. In addition, the operation panel 8 may include display means including a display such as a liquid crystal monitor.

  The control device 171 controls the elevating / lowering body moving unit 163 and the fixing mechanism moving unit 164 in accordance with a command from the operation panel 8. That is, when the subject O is introduced into the subject holding device (head fixing portion) 7, the lifting body moving means 163 is driven to move the lifting body 3 up and down to a predetermined position. Further, after the subject O is held at a predetermined position by the subject holding device (head fixing unit) 7, when the imaging region is moved up and down, the lifting / lowering body moving means 163 is driven and driven. The fixing mechanism moving means 164 is driven in synchronism with the above.

  The X-ray imaging apparatus is connected to an image display apparatus (not shown) via a communication cable or the like, sends data captured by the X-ray imaging apparatus to the image display apparatus, performs processing such as reconstruction on the image display apparatus, panorama image, CT Images etc. are displayed. The image display device is configured by, for example, a personal computer or a workstation. The shooting mode can be set by a personal computer or workstation constituting the image display apparatus.

  2 is a more specific front view of the X-ray imaging apparatus, FIG. 3 is a side view, and FIG. 4 is a top view.

  In this X-ray imaging apparatus, a column 2 is erected on a base 1 installed on a floor surface. The elevating body 3 is supported on the column 2 so as to be movable up and down. A holding frame 4 as a holding member is supported on the upper part of the elevating body 3, and a turning means 51 for holding the turning arm 5 is attached to the distal end side of the holding frame 4. A drive unit is provided in the holding frame 4.

  A swivel arm 5 formed in a substantially U-shape is supported at the lower portion of the swivel means 51 so as to be swivelable. An X-ray detection unit 53 and an X-ray irradiation unit 52 are provided on both sides of the swivel arm 5. Yes. A lifting body moving means 163 is provided at a connection portion of the holding frame 4 with the lifting body 3. In this embodiment, as described later, an electric actuator 163a (see FIG. 8) is used as the elevating body moving means 163, and the elevating body 3 moves up and down with respect to the support column 2 by the operation of the electric actuator 163a. The lifting / lowering body moving means 163 may be any means as long as it moves the lifting / lowering body 3 up and down with respect to the support column 2, and can be configured by a motor and a ball screw in addition to the electric actuator.

  A patient frame 6 is fixed to the elevating body 3, and the swing arm 5 and the patient frame 6 integrally move up and down as the elevating body 3 moves up and down.

  A subject holding device (head fixing portion) 7 is attached to the distal end portion of the patient frame 6 so as to be movable up and down independently of the patient frame 6.

  The subject holding device (head fixing portion) 7 includes a head fixing portion 70 for fixing the head of the subject O and a pair of handles 71 for the subject O to grip.

  The head fixing unit 70 is symmetrical to a chin rest 73 for placing the chin of the subject O and a lateral head for fixing the temporal region in order to stably fix the head of the subject O during imaging. The three-point fixing method is basically composed of a side head press 72 that opens and closes and a front head press (not shown) for supporting the frontal head. The temporal head holder 72 of the head fixing portion 70 is opened and closed by turning the dial 74, and the width of the temporal head holder 72 is adjusted by the dial 74 according to the subject O. The chin rest 73 shown in FIG. 2 is for panoramic photography and is provided with a bite block 73a. As shown in FIGS. 11 and 12, which will be described later, in the case of CT imaging, the chin rest 73 for CT imaging is replaced. If necessary, an ear rod (not shown) for fixing the outer ear can be provided in the head fixing portion 70 instead of the temporal head presser 72.

  An operation panel 8 is attached to the patient frame 6, and the operation panel 8 is used to instruct the movement of the elevating body 3 and the movement of the subject holding device (head fixing unit) 7. The operation panel 8 is composed of, for example, a touch panel, icons for instructing various operations of the X-ray imaging apparatus are displayed, and the operation is selected by touching the corresponding icon.

  As shown in FIG. 4 and FIG. 11 to be described later, the operation panel 8 is attached to the patient frame 6 so as to be rotatable around the distal end portion of the patient frame 6 of the operation panel 8 as a rotation center. That is, the operation panel 8 is set to a first position substantially parallel to the patient frame 6 (see FIGS. 4A and 11A), and the operation panel 8 is set to the patient frame 6. The state (see FIGS. 4 (b) and 11 (b)) set to the second position substantially orthogonal is configured to be selectable depending on the use state. Normally, the operation panel 8 is set to the first state.

  In addition, the turning arm 5 is provided with a positioning beam generator 54 for determining the front and back positions during panoramic tomography, and the positioning beam L24 emitted from the positioning beam generator 54 allows the subject O to move. The front-rear position is adjusted (see FIGS. 17A and 17B). The patient frame 6 is provided with a median beam generator 61, and the midline of the subject O is positioned by the median beam L21 emitted from the median beam generator 61 (FIG. 17A). b)).

  At the time of panoramic tomography, a beam is emitted from the positioning beam generator 54 and the subject O is positioned. At this time, the operator operates the operation panel 8 while looking at the subject O at a position parallel to the beam emitted from the positioning beam generator 54. In this operation, it is easier to operate the screen of the operation panel 8 when viewed from the front side. Therefore, in this embodiment, the operation panel 8 is rotatably attached to the patient frame 6, and the operation panel 8 is rotated to a second position substantially orthogonal to the patient frame 6 as necessary. 8 is configured so that it can be viewed from the front side.

  The elevating body 3 is provided with a beam generating device 100 indicating an imaging target area (image reconstruction range) and the like, and an area to be imaged by the patient O from the beam emitting units 111 and 112 by CT tomography or the like. Is irradiated. The beam emitting unit 111 emits a beam indicating a lower limit in CT tomography. In this embodiment, the beam emitting unit 112 is configured to be movable up and down, and moves to a position indicating an upper limit in accordance with the size of the shooting target area (image reconstruction range) of the selected shooting mode. Irradiate the indicated beam. Furthermore, the beam emitting unit 112 also emits a beam indicating the Frankfurt plane in the case of panoramic tomography. In accordance with the beam, the elevating body 3 is moved up and down for alignment. That is, when a shooting mode is selected by a personal computer or the like that constitutes the above-described image display device (not shown), the beam emitting unit 112 moves to a predetermined position. Then, the beam generation apparatus 100 irradiates the subject O with the beam to determine the range of the imaging target region (image reconstruction range) in the selected mode, and positions the subject O within the range. The operation of the lifting / lowering body moving means 163 and the fixing mechanism moving means 164 of the drive unit 160 can be controlled by an instruction from the operation panel 8.

  In this embodiment, as shown in FIGS. 5 to 7, the beam generation apparatus 100 includes a first beam generator 101 and a second beam generator 102, and the beam generator 102 located on the upper side is moved up and down. It is configured to be movable. The beam generator 101 includes a beam emitting unit 111 that emits a laser beam, and the beam generator 102 includes a beam emitting unit 112 that emits a laser beam. The beams emitted from the first beam generator 101 and the second beam generator 102 of the beam generator 100 are irradiated to the subject O as shown in FIGS.

  In this beam generating apparatus 100, a base 135 is attached to the elevating body 3 using a screw 133. The beam generator 102 is supported by the ball screw 131 and the slide shaft 130 so as to be vertically movable with respect to the base 135.

  The beam generator 101 is fixed to the base 135 and emits a beam L23 indicating a lower limit region in the case of CT tomography from the beam emitting unit 111. This beam L23 is used as a reference for the position of the chin rest 73 when the subject O is positioned. That is, when positioning the lower jaw of the subject O to the chin rest 73 of the head fixing unit 70, the beam is emitted so that the position of the beam emitted from the beam emitting unit 111 of the beam generator 101 indicates the position of the chin rest 73. The generator 101 is fixed to the base 135.

  The slider shaft 130 is attached to attachment members 135 a and 135 b erected from the base 135, and the support portion 113 of the beam generator 102 is supported on the slider shaft 130 so as to be movable up and down. Further, a bearing is built in the mounting member 135a of the base 135. A ball screw 131 is rotatably supported by the bearing, and the ball screw 131 is provided in parallel with the slider shaft 130. The ball screw 131 is connected to the motor shaft 132 a of the stepping motor 132 through the Oldham coupling 103 and the spacer 104. The stepping motor 132 is fixed to the base 135 via an L-shaped attachment member 132b. Depending on the length of the ball screw 131, the ball screw 131 and the Oldham coupling 103 may be directly connected without using the spacer 104. By driving the stepping motor 132, the ball screw 131 rotates. By controlling the number of rotations of the stepping motor 132, the amount of vertical movement of the beam generator 102 can be controlled.

  A ball bush that meshes with the ball screw 131 is provided inside the support portion 113 of the beam generator 102. The beam moving means 165 includes a slider shaft 130, a support portion 113, a ball screw 131, a stepping motor 132, and the like.

  When the stepping motor 132 is driven and the ball screw 131 is rotated, the support portion 113 moves up or down, and the beam generator 102 moves up or down along the slider shaft 130. The base 130 is provided with a photosensor 121 that detects a lower limit position of the beam generator 102 and a photosensor 122 that detects an upper limit position. The support 113 is provided with an indication piece 113a, and the photosensors 121 and 122 detect the indication piece 113a, thereby detecting the lower limit position or the upper limit position of the beam generator 102. When the stepping motor 132 detects the pointing piece 113a by the photosensors 121 and 122, further driving is stopped.

As shown in FIG. 7, the beam generator 102 moves from the lower limit position to the upper limit position to a position corresponding to the upper limit of the imaging target area by driving the stepping motor 132. Further, in the case of emitting a beam L22 ₁ showing the Frankfort horizontal plane is moved to a position corresponding to the eye ear of the subject O.

For example, when having a mode of a D (Dental) mode in a small range and an I (Implant) mode or an A (Alveolar) mode capable of shooting in a large range, an imaging target region of the D mode, I mode or A mode The beam generator 102 moves in order to indicate the imaging target area. For example, beam L22 ₂ upper limit position of the D-mode is emitted when the beam generator 102 to the position below is located. Selecting I mode or A mode, the beam generator 102 is moved upward, for emitting a beam L22 ₃ showing the upper limit of the I-mode or A mode. Further, if it has a F-mode to shoot the entire head further increases the beam generator 102 emits a beam L22 ₄ showing the upper limit position of the F-mode.

In the beam generator 100 of this embodiment, the beam generator 102 located on the upper side moves up and down. When the imaging mode is selected, the beam moving means 165 in the drive unit section 160 operates to rotate the stepping motor 132, and the upper beam generator 102 moves to a predetermined position. Then, one of the beams L22 ₂ , L22 ₃ , and L22 ₄ indicating the upper limit to be imaged by CT tomography for the imaging target region (image reconstruction range) is emitted. Also, so that the beam L22 ₁ showing the Frankfort horizontal plane is emitted in case of the panoramic tomography. And it can respond easily to several imaging | photography object area | regions only by controlling the moving amount | distance of the beam generator 102. FIG.

  The beam generator 100 of this embodiment can deal with a plurality of imaging target regions in CT tomography, and can emit a beam for the Frankfurt plane in panoramic tomography, with the two beam generators 101 and 102. For this reason, it is possible to reduce the size of the device, reduce the number of beam generators to two, and reduce the cost. In addition, by reducing the size of the device, the installation space can be reduced, and the degree of freedom for the installation location in the X-ray imaging apparatus is increased. In addition, a driving device such as a motor for moving up and down can be reduced in size.

  In accordance with the beam from the beam generator 100 described above, the elevating body 3 is moved up and down for alignment. That is, the beam generation apparatus 100 irradiates the subject O with a beam indicating which range the imaging target region (image reconstruction range) of the selected mode is, and positions the subject O within the range. The operation of the lifting / lowering body moving means 163 and the fixing mechanism moving means 164 of the drive unit 160 can be controlled by an instruction from the operation panel 8.

  The drive unit 160 includes a drive device that includes a turning axis position setting unit 161 and a turning shaft rotation unit 162 and includes a motor having a highly accurate positioning function. The turning shaft 5c is rotated by the rotational drive of the motor.

  Further, the turning axis position setting means 161 is configured to move the turning axis 5c in the X direction and the Y direction, such as a Y table that moves in the Y direction and an X table that moves in the X direction on the Y table. Alternatively, a configuration including a rotation shaft and a crank and movable in the X direction and the Y direction may be applied.

  The turning arm 5 includes turning arm position setting means 51. The turning arm position setting means 51 includes a turning table that can turn and a slide table that can move directly on the turning table.

  As described above, the drive unit 160 includes the lifting body moving means 163 and the fixing mechanism moving means 164. The lifting body moving means 163 has an electric actuator 163a, and the lifting body 3 moves up and down by the operation of the electric actuator 163a. The fixing mechanism moving means 164 includes a motor, a sprocket, and a chain, and moves the subject holding device (head fixing portion) 7 up and down with respect to the patient frame 6 by the rotation of the motor. After the subject O is fixed to the head fixing portion 70 and positioned, the subject holding device (head fixing portion) 7 is positioned relative to the position from the base 1 even if the elevating body 3 moves up and down. The fixing mechanism moving means 164 operates and moves relative to the patient frame 6 in synchronization with the movement of the elevating body 3 so that the height position does not change. For example, when the elevating body 3 moves upward, the subject holding device (head fixing portion) 7 moves in synchronization with the patient frame 6 in the downward direction, and the subject is moved relative to the position from the base 3. The examiner holding device (head fixing portion) 7 is configured to maintain its height position.

  In the X-ray irradiator 52, a collimator 52b provided in front of the X-ray irradiator 52a is composed of a mask in which a plurality of slits having different shapes are formed. Any one is selected, and the spread of the X-ray beam irradiated from the X-ray generator 52a is limited by the selected slit. In panoramic tomography, a panoramic aperture is selected, and an X-ray slit beam corresponding to the shape is irradiated toward the X-ray detector 53 a of the X-ray detector 53. In this state, the swivel arm 5 is swung, and the transmitted image projected on the detection surface of the X-ray detector 53b is accumulated as panoramic tomography data while scanning the maxillofacial surface with the X-ray slit beam. Panoramic tomography is performed.

  In CT tomography, when an imaging mode is selected, a CT aperture corresponding to the imaging mode is selected from a plurality of CT apertures, and an X-ray beam corresponding to the shape is detected by an X-ray detector 53a of the X-ray detector 53a. Irradiated towards. Then, the swivel arm 5 is swung in this state, and the CT image is acquired by accumulating transmission images projected on the detection surface of the X-ray detector 53b as CT image data while scanning the maxillofacial surface with the X-ray beam. Executed.

  As described above, the swivel arm 5 can be swung according to the photographing mode of the subject O, and tomography such as panoramic tomography can be performed, and a tomogram at an arbitrary cross section of the teeth and craniomaxilla. Shooting is possible.

  Next, a mode in which the elevating body 3 is attached to the column 2 so as to be movable up and down will be described with reference to FIGS. FIG. 8 is a front view showing a part of the lifting / lowering body moving means in a cutaway manner, FIG. 9 is a front view showing an engagement state between the lifting / lowering body and the column, and FIG. 10 is a schematic sectional view of the same. .

  A pair of linear guides 21 are attached to the column 2. The linear guide 21 is provided with a recess 21 a in the center, and sliders 35 respectively fitted to the upper and lower portions of the elevating body 3 are fitted in the recess 21 a so that the elevating body 3 can move up and down with respect to the column 2. Supported by

  An electric actuator 163a that constitutes the lifting body moving means 163 is inserted into the column 2 and the distal end portion of the telescopic rod 163c of the electric actuator 163a is engaged with and attached to the locking portion 163d attached to the column 3. A main body 163 b of the electric actuator 163 a is inserted into the elevating body 3, and a base of the main body 163 b is fixed to the holding frame 4 attached to the elevating body 3.

  The elevating body 3 moves up and down along the linear guide 21 as the telescopic rod 163c of the electric actuator 163a expands and contracts.

  Next, the patient frame 6 and the subject holding device (head fixing portion) 7 will be described with reference to FIGS.

  The patient frame 6 is attached to the lifting body 3 and moves up and down integrally with the lifting body 3. A subject holding device (head fixing portion) 7 is attached to the distal end portion of the patient frame 6 so as to be movable up and down independently of the patient frame 6.

  The subject holding device (head fixing portion) 7 includes a head fixing portion 70 for fixing the head of the subject O and a pair of handles 71 for the subject O to grip. A chin rest 73 shown in FIGS. 11 to 13 is a chin rest for CT tomography.

  The head fixing unit 70 includes a chin rest 73 for placing the chin of the subject O, a side head holder 72 that opens and closes symmetrically for fixing the temporal region, and a front for supporting the frontal region. And a head press 75. As shown in FIG. 14, the temporal head holder 72 of the head fixing portion 70 is attached by being inserted into a pair of bases 72 a. When the ear rod is used, the ear rod is inserted into the base 72a and fixed. By turning the dial 74, the base 72a approaches or separates from each other, and the temporal head retainers 72 inserted into the base 72a approach or separate from each other. Then, the width of the temporal presser 72 is adjusted with the dial 74 according to the subject O.

  The chin rest 73 shown in FIG. 2 is for panoramic tomography and is provided with a bite block 73a. When replacing the chin rest 73 for CT tomography shown in FIGS. 11 and 12, the base of the chin rest 73 used for the chin rest attaching portion 73 b is inserted and the chin rest 73 is fixed to the head fixing portion 70.

  The forehead presser 75 is attached to a frame 75b attached to the base of the head fixing part 70 using an adjustment bolt 75a. The adjustment bolt 75a is adjusted so that the forehead presser 75 abuts the forehead of the subject O.

  A plate 68 is provided at the distal end portion of the patient frame 6, and a slider 65 is attached to a collar portion 68 b in the vicinity of both ends of the plate 68. A front block 69 is attached to the slider 65. A ball screw 64a is attached to the central portion of the plate 68 via a bearing 68a. A ball bush 67 that meshes with the ball screw 64 a is attached to the center of the front block 69.

  A pair of plates 66 provided on the front block 69 are attached to the chin rest base 7a, and the chin rest base 7a is attached to the patient frame 6 via the front block 69. A sprocket 64 is attached to the tip of the ball screw 64a. On the other hand, a motor 60 is attached to the patient frame 6, and a sprocket 61 is fixed to the motor shaft. A chain 62 is hung between the sprockets 61 and 64. In this embodiment, the gear ratio between the sprockets 61 and 64 is 1: 1.

  In this embodiment, it is only necessary to move the portion of the head fixing portion 70 with respect to the patient frame 6, so that the rigidity is reduced and the lifting thrust or holding force can also be reduced. Therefore, the motor 60 can be handled by a small motor.

  By driving the motor 60 and driving the sprockets 61 and 64 and the chain 62, the ball screw 68a is rotated. By this rotation, the ball bush 67 moves up and down. By this movement, the front block 69 moves up and down along the slider 65. As a result, the chin rest base 7a attached to the front block 69 via the plate 65 moves up and down.

  Synchronizing with the lifting / lowering operation of the lifting / lowering main body 3, the motor 60 is rotationally driven, so that the head fixing portion 70 moves with respect to the patient frame 6 as shown by the broken lines in FIGS. 12 and 13. As indicated by the broken line, the patient frame 6 is raised, but the head fixing portion 70 is moved downward with respect to the patient frame 6 so as to keep the position as it is.

  FIGS. 17A and 17B show beams irradiated to the subject O. FIG. Using the beams emitted from the beam generator 100, the positioning beam generator 54, and the median beam generator 61, the subject O is positioned and the lift body 3 is positioned. As shown in FIGS. 17A and 17B, the mid beam L21 emitted from the mid beam generator 61 is used for positioning the subject O with the mid line.

When performing panoramic tomography, as shown in FIG. 17A, the mid-beam L21, the beam L22 ₁ indicating the Frankfurt plane, and the positioning beam L24 are emitted. Beam generator 100, the panoramic tomography is selected as the shooting mode, it operates the beam moving means 165 raises the beam generator 102 located on the upper side to the predetermined position, the beam L22 ₁ showing the Frankfort horizontal plane Exit.

The subject O places the lower jaw on the chin rest 73 of the head fixing portion 70 so that the position of the subject O is determined so that the median beam L21 and the median line of the subject O coincide. Then, by moving the beam generator 102 of the beam generator 100 to align the eye ear of a subject of O, irradiating a beam L22 ₁ showing the Frankfort horizontal plane to the subject O.

When performing CT tomography, as shown in FIG. 17 (b), beam generator 100, the D-mode beam L22 ₃ or CT tomography showing the upper region of the I-mode or the A mode in the CT tomography A beam L22 ₂ indicating the upper limit region and a beam L23 indicating the lower limit region of CT tomography are irradiated. When CT mode tomography in the I mode or A mode is selected as the imaging mode, the beam moving means 165 operates to raise the beam generator 102 located on the upper side, and the beam L22 indicating the upper limit region of the I mode or A mode. ₃ is stopped at the position where it exits. The beam generator 102 emits a beam L22 ₃ indicating the upper limit region of the I mode or A mode, and the beam generator 101 emits a beam L23 indicating the lower limit region. When D-mode tomography is selected as the shooting mode, it operates the beam moving means 165 raises the beam generator 102 located above, stopped at the position for emitting the beam L22 ₂ showing the upper region of the D-mode Let Then, a beam L22 ₂ indicating the upper limit region of the D mode is emitted from the beam generator 102, and a beam L23 indicating the lower limit region is emitted from the beam generator 101. When F mode CT tomography is selected as the shooting mode, the beam moving means 165 is operated to raise the beam generator 102 located above the position for emitting the beam L22 ₄ showing the upper region of the F-mode Stop. Then, a beam L22 ₄ indicating the upper limit region of the F mode is emitted from the beam generator 102, and a beam L23 indicating the lower limit region is emitted from the beam generator 101.

As described above, when the imaging mode is selected, the beams L21, L24, L22 ₁ , L22 ₂ , L22 ₃ and L22 ₄ are irradiated with the beam corresponding to the mode. That is, a beam corresponding to an imaging target region corresponding to panoramic tomography and CT tomography is irradiated.

  The elevating body 3 is moved by the beam irradiated to the subject O, and the imaging target area is positioned.

  Next, the use operation of the X-ray imaging apparatus of the present invention will be described. First, a case where panoramic tomography is performed will be described. A panoramic tomography mode is selected using a personal computer (not shown) and various settings are made. Then, the subject O is introduced into the X-ray imaging apparatus. First, the operation panel 8 is operated so that the chin rest 73 is adjusted to the height of the lower jaw of the subject O, and the elevating body 3 is moved up and down. When this lifting / lowering is instructed, the lifting / lowering body moving means 163 operates to move the lifting / lowering body 3 up and down. At this time, the subject holding device 7 moves up and down together with the lifting body 3 together with the patient frame 6. The position of the chin rest 73 is a reference for the lower limit position at the time of CT imaging.

  When the bite block 73a is used, the elevating body 3 is stopped in a state where the chin rest 73 is set to the height of the lower jaw of the subject O, and the subject O is bitten by the tip of the bite block 73a. Alternatively, the elevating body 3 may be stopped with the subject O biting the tip of the bite block 73a first and the chin rest 73 being adjusted to the height of the lower jaw of the subject O.

When the positioned beam switch on the operation panel 8 is pressed, a beam L12 indicating the Frankfurt plane is emitted from the beam generator 102 of the beam generator 100 and is transmitted from the median beam generator 61 to the median beam L21 as shown in FIG. Is emitted, and the positioning beam L24 is emitted from the positioning beam generator 54. Median beam L21 and the subject O midline, combined with beam L22 ₁ showing the Frankfort horizontal plane subject O eye ear plane, the position of the canine and positioning beam L24 subject O. The beam generator 102 is moved up and down in accordance with the subject O and aligned. Then, in order to press the head of the subject O with the temporal presser 72, the width of the temporal presser 72 is adjusted with the dial 74 according to the subject O.

  Further, when the forehead presser 75 is attached, the forehead presser 75 and the forehead of the subject O are brought into contact with each other. In this way, the subject O is fixed to the head fixing portion 70 of the subject holding device 7. In addition, the subject O can maintain the stability of the body by grasping the grip 71 with both hands.

  As the collimator 52b, an opening for panoramic tomography is selected. By pushing the X-ray irradiation switch, the turning arm 5 rotates around the fixed subject O at a designated speed. Data from the X-ray detection unit 53 is read at an appropriate reading interval linked to the movement, and a panoramic image of a desired tomographic area can be obtained.

  In this apparatus, after fixing the subject O to the head fixing portion 70, the imaging mode is changed, and the height of the subject holding device (head fixing portion) 7 from the base 1 is not changed. In order to move the swivel arm 5 up and down, the elevating body 3 can be moved up and down. For example, it is possible to photograph the temporomandibular joint of the subject O after positioning for panoramic tomography of the subject O.

  A personal computer or the like is used to instruct to change the shooting mode to TMJ4 or TMJ2. By this instruction, the subject holding device (head fixing portion) 7 can move with respect to the patient frame 6.

By designating TMJ4 or TMJ2, pressing the positioning beam switch of the operation panel 8, the beam L22 ₁ and positioning beam L24 showing the Frankfort horizontal plane is emitted. The elevating body 3 is moved by the operation panel 8 so that both beams are aligned with the temporomandibular joint of the subject O. For example, as shown in FIG. 19, when the elevating body 3 is moved upward, the elevating body 3 is moved upward by the operation of the electric actuator 163a of the elevating body moving means 163. The fixing mechanism moving means 164 is driven by a motor in synchronization with the movement of the elevating body 3 to move the subject holding device (head fixing portion) 7 downward with respect to the patient frame 6. After the subject O is fixed to the head fixing portion 70 and positioned, the subject holding device (head fixing portion) 7 is positioned relative to the position from the base 1 even if the elevating body 3 moves up and down. The fixing mechanism moving means 164 operates and moves relative to the patient frame 6 in synchronization with the movement of the elevating body 3 so that the height position does not change. As shown in FIG. 19, for example, when the elevating body 3 moves upward, the subject holding device (head fixing portion) 7 moves synchronously with respect to the patient frame 6, and the base 1 The subject holding device (head fixing portion) 7 maintains its height position with respect to the position from the side.

  Thus, the motor is driven in synchronization with the lifting operation of the lifting body 3, and the subject holding device (head fixing portion) 7 moves with respect to the patient frame 6. As a result, the imaging region can be adjusted and changed without changing the angle and posture of the subject O's chin.

  Next, after aligning the subject O for panoramic imaging of the subject O, it is also possible to perform CT imaging of the upper jaw portion of the subject O.

  An imaging mode for CT tomography is selected by a personal computer or the like. The imaging target area of the selected imaging mode is set, and the corresponding CT opening of the collimator 52b is selected. By this instruction, the subject holding device (head fixing portion) 7 can move with respect to the patient frame 6. For example, the elevating body 3 can be moved from the state shown in FIG. 18 to the state shown in FIG.

  When the elevating body 3 is moved upward as shown in FIG. 19 by the operation panel 8, the elevating body 3 is moved upward by the operation of the electric actuator 163 a of the elevating body moving means 163. The fixing mechanism moving means 164 is driven by a motor in synchronization with the movement of the elevating body 3 to move the subject holding device (head fixing portion) 7 downward with respect to the patient frame 6. After the subject O is fixed to the head fixing portion 70 and positioned, the subject holding device (head fixing portion) 7 is positioned relative to the position from the base 1 even if the elevating body 3 moves up and down. The fixing mechanism moving means 164 operates and moves relative to the patient frame 6 in synchronization with the movement of the elevating body 3 so that the height position does not change. As shown in FIG. 19, for example, when the elevating body 3 moves upward, the subject holding device (head fixing portion) 7 moves synchronously with respect to the patient frame 6, and the base 1 The subject holding device (head fixing portion) 7 maintains its height position with respect to the position from the side.

  Thus, the motor is driven in synchronization with the lifting operation of the lifting body 3, and the subject holding device 7 moves relative to the patient frame 6. As a result, the imaging region can be adjusted and changed without changing the angle and posture of the subject O's chin.

  Next, the CT tomography operation of the X-ray imaging apparatus of the present invention will be described. Using a personal computer or the like, the CT tomography mode is selected and various settings are made. The imaging target area of the selected imaging mode is set, and the corresponding CT opening of the collimator 52b is selected. Then, the subject O is introduced into the X-ray imaging apparatus. First, the operation panel 8 is operated so that the chin rest 73 is adjusted to the height of the lower jaw of the subject O, and the elevating body 3 is moved up and down. When this raising / lowering is instructed, the electric actuator 163 is driven, and the raising / lowering body 3 moves up and down. At this time, the subject holding device (head fixing portion) 7 also moves up and down together with the lift frame 3 together with the patient frame 6. The elevating body 3 is stopped in a state where the chin rest 73 is adjusted to the height of the lower jaw of the subject O.

  When the positioning beam switch on the operation panel 8 is pressed, for example, the beam generator 102 of the beam generator 100 moves to a predetermined position to the upper limit position of the beam corresponding to the selected mode, and the beam corresponding to the selected mode. Is emitted. Then, a beam L23 indicating the lower limit region of CT tomography is emitted. Then, the mid beam L21 is emitted from the mid beam generator 61. The median beam L21 and the midline of the subject O are aligned, and the beam L16 and the lower jaw of the subject O are aligned. Then, in order to press the head of the subject O with the temporal presser 72, the width of the temporal presser 72 is adjusted with the dial 74 according to the subject O.

  Further, when the forehead presser 75 is attached, the forehead presser 75 and the forehead of the subject O are brought into contact with each other. In this way, the subject O is fixed to the head fixing portion 70 of the subject holding device (head fixing portion) 7. In addition, the subject O can maintain the stability of the body by grasping the grip 71 with both hands. Then, for example, as shown in FIG. 18, it is positioned in the imaging target region with the lower jaw as a reference.

  In the collimator 52b, an opening corresponding to the imaging mode is selected from a plurality of CT imaging openings. By pushing the X-ray irradiation switch, the turning arm 5 rotates around the fixed subject O at a designated speed. Data from the X-ray detection unit 53 is read at an appropriate reading interval linked to the movement, and a CT image of a desired tomographic region can be obtained.

  In this apparatus, after the subject O is fixed to the head fixing portion 70, the swivel arm 5 is moved without changing the height from the base of the subject holding device 7 in order to move the imaging region. The elevating body 3 can be moved up and down to move up and down. For example, it is possible to perform CT imaging of the upper jaw portion of the subject O after the subject O is positioned and photographed in the state shown in FIG.

  The operation panel 8 is used to designate a shooting target area and instruct to change the shooting target area. By this instruction, the subject holding device (head fixing portion) 7 can move with respect to the patient frame 6. For example, the elevating body 3 can be moved from the state shown in FIG. 18 to the state shown in FIG.

  When the elevating body 3 is moved upward as shown in FIG. 19 by the operation panel 8, the elevating body 3 is moved upward by the operation of the electric actuator 163 a of the elevating body moving means 163. The fixing mechanism moving means 164 is driven by a motor in synchronization with the movement of the elevating body 3 to move the subject holding device (head fixing portion) 7 downward with respect to the patient frame 6. After the subject O is fixed to the head fixing portion 70 and positioned, the subject holding device (head fixing portion) 7 is positioned relative to the position from the base 1 even if the elevating body 3 moves up and down. The fixing mechanism moving means 164 operates and moves relative to the patient frame 6 in synchronization with the movement of the elevating body 3 so that the height position does not change. As shown in FIG. 19, for example, when the elevating body 3 moves upward, the subject holding device (head fixing portion) 7 moves synchronously with respect to the patient frame 6, and the base 1 The subject holding device (head fixing portion) 7 maintains its height position with respect to the position from the side.

  Thus, the motor is driven in synchronization with the lifting operation of the lifting body 3, and the subject holding device (head fixing portion) 7 moves with respect to the patient frame 6. As a result, the imaging region can be adjusted and changed without changing the angle and posture of the subject O's chin.

  As described above, the head fixing portion 70 has a temporal head press, a front head press, and a back head pad, and moves up and down in synchronization with the up and down movement of the chin rest 73. In addition, the handle 71 that the subject O holds with both hands is also provided between the head fixing portion 70 and the lifting body 3 and is moved up and down in synchronism with the lifting and lowering of the head fixing portion 70. The imaging region can be changed without changing the positioning posture and the positional relationship between the jaw and the hand.

  In addition, instead of having the lifting mechanism of the head fixing device 70 in the vicinity of the lifting body 3, only the minimum mechanism portion including the handle 71 is lifted in the vicinity of the patient frame 6, thereby The rigidity of the part fixing part) 7 can be reduced, and the lifting thrust or holding force can also be reduced.

  In the above-described embodiment, the present invention is applied to the standing X-ray imaging apparatus in which the elevating body 3 as the support body is attached to the support column 2 so as to be movable up and down. Can be applied. The present invention can also be applied to an X-ray imaging apparatus in which the support body does not move up and down.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims for patent.

1 Base 2 Strut 3 Lifting body (supporting body)
4 Holding frame (holding member)
DESCRIPTION OF SYMBOLS 5 Turning arm 51 Turning arm position setting means 52 X-ray irradiation part 53 X-ray detection part 6 Patient frame 7 Subject holding device 70 Head fixing | fixed part 71 Grip 8 Operation panel 100 Beam generator 101, 102 Beam generator

Claims (10)

A revolving arm having an X-ray irradiating unit and an X-ray detecting unit disposed opposite to each other with respect to the head of the subject; a holding member that holds the revolving arm; and a support body that supports the holding member; An X-ray imaging apparatus that performs X-ray imaging by turning the swivel arm, and a subject holding device that fixes the head of the subject.
Beam generating means for emitting a beam to the head of the subject, the beam generating means includes a base attached to the support body, and a first beam generator fixed to a reference position of the base And a second beam generator provided on the base so as to be movable up and down with respect to the first beam generator, moving the second beam generator to a predetermined position, and performing a plurality of imaging An X-ray imaging apparatus that irradiates a position beam corresponding to a region.   The subject holding device has a chin rest, and the reference position of the base is matched with the position of the chin rest when the subject holding device of the subject is introduced. The X-ray imaging apparatus described.   The first beam generator emits a beam indicating a lower limit area in the case of CT tomography, and the second beam generator emits a beam indicating an upper limit area in the case of CT tomography. The X-ray imaging apparatus according to claim 1 or 2.   The X-ray imaging apparatus according to claim 1, wherein the second beam generator emits a beam indicating a Frankfurt plane in the case of panoramic tomography. A revolving arm having an X-ray irradiating unit and an X-ray detecting unit arranged opposite to each other with respect to the head of the subject, a holding frame that holds the revolving arm, and a lifting body that supports the holding frame; An X-ray imaging apparatus comprising: a subject holding device that fixes the subject's head; and a support that supports the elevating body so as to be movable up and down.
The elevating body has beam generating means for emitting a beam to the head of the subject. The beam generating means is a base attached to the elevating body and a first fixed to the reference position of the base. And a second beam generator provided on the base so as to be movable up and down with respect to the first beam generator, and the second beam generator is moved to a predetermined position. An X-ray imaging apparatus that irradiates a position beam corresponding to a plurality of imaging regions.   The said subject holding device has a chin rest, and the reference position of the base is matched with the position of the chin rest at the time of introduction of the subject holding device of the subject. The X-ray imaging apparatus described.   The patient frame is attached to the elevating body, and the subject holding device is attached to the distal end of the patient frame so as to be movable up and down independently of the patient frame. Item 7. The X-ray imaging apparatus according to Item 6.   The first beam generator emits a beam indicating a lower limit area in the case of CT tomography, and the second beam generator emits a beam indicating an upper limit area in the case of CT tomography. The X-ray imaging apparatus according to any one of claims 5 to 7.   The X-ray imaging apparatus according to any one of claims 5 to 8, wherein the second beam generator irradiates a beam indicating a Frankfurt plane in the case of panoramic tomography.   The X-ray imaging apparatus according to any one of claims 5 to 9, wherein the beam generating means moves up and down in response to the vertical movement of the lifting body.

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