JPWO2019082227A1 - Dental X-ray equipment - Google Patents

Abstract

Provided is a dental X-ray imaging apparatus capable of easily positioning a subject's head. A swivel arm 10 having an X-ray generation unit 2 and an X-ray detection unit 3, an arm support unit 20 that supports the swivel arm 10 so that the swivel arm 10 can swivel, a post unit 30 that supports the arm support unit 20 so that it can be raised and lowered, The jaw positioning unit 50 that is supported by the unit 30 so as to be movable up and down and supports the jaw of the subject provided between the X-ray generation unit 2 and the X-ray detection unit 3, and any of the column unit 30 and the jaw positioning unit 50 And a camera 33 that is capable of photographing from the front direction of the subject's jaw supported by the jaw positioning unit 50, and the optical axis of the camera 33 is directed obliquely upward with respect to the horizontal plane. ing.

Description

  The present invention relates to a dental X-ray imaging apparatus in which a subject's head is positioned.

  In X-ray imaging in dentistry, an operator guides a subject to an X-ray imaging apparatus, and then the operator positions the head of the subject. Specifically, the head of the subject is positioned by adjusting the device while the surgeon instructs the subject.

  In general, in panoramic X-ray photography, the head of a subject is positioned such that the Frankfurt plane is parallel to a horizontal plane (for example, a floor surface). The Frankfurt plane is a virtual plane connecting the left and right orbit lowermost points, which are front reference points, and the upper ends of both ear canals, which are rear reference points. It is known that when the Frankfurt plane is parallel to the horizontal plane, the occlusal plane tilts forward at an appropriate angle, so that the anatomical structure of the subject's jaw is clearly X-rayed in panoramic tomography. Patent Document 1 discloses an X-ray imaging apparatus including a beam generator. In this X-ray imaging apparatus, the subject is irradiated with a horizontal beam indicating the Frankfurt plane parallel to the horizontal plane from the beam generator, and the subject's head is positioned based on the horizontal beam.

JP2013-244145A

  However, in the X-ray imaging apparatus disclosed in Patent Document 1, it is not easy for the surgeon to adjust the apparatus while instructing the subject so that the Frankfurt plane follows the horizontal beam. Also, it is difficult for the subject to recognize the Frankfurt plane, and the subject may feel the horizontal beam near the field of view uncomfortable.

  In view of the above circumstances, there is a need for a dental X-ray imaging apparatus that can easily position the head of a subject.

A characteristic configuration of a dental X-ray imaging apparatus according to the present invention includes a swivel arm having an X-ray generation unit and an X-ray detection unit,
An arm support portion for pivotally supporting the swivel arm;
A support column that supports the arm support so as to be movable up and down;
A jaw positioning unit that is supported by the support column so as to be movable up and down, and that supports a jaw of a subject provided between the X-ray generation unit and the X-ray detection unit;
A camera that is provided on any one of the support column and the chin positioning unit, and capable of photographing from the front direction of the subject's chin supported by the chin positioning unit;
The optical axis of the camera is directed obliquely upward with respect to the horizontal plane.

  When the subject's head is positioned on the X-ray imaging apparatus so that the Frankfurt plane is parallel to the horizontal plane, the anatomical structure of the subject's jaw is clearly X-rayed in panoramic tomography. The occlusal plane, which is the plane in contact with the upper and lower teeth, has a predetermined angle with respect to the Frankfurt plane, and when the Frankfurt plane is parallel to the horizontal plane, the occlusal plane is inclined downward from the horizontal plane toward the front of the subject. . In this configuration, the camera is arranged on one of the support column and the jaw positioning unit so that the optical axis of the camera is directed obliquely upward with respect to the horizontal plane, and the jaw positioning unit The supported subject's jaw can be photographed.

  With this configuration, when the Frankfurt plane is parallel to the horizontal plane, the front-facing camera of the subject's jaw can easily position the optical axis on the occlusal plane. In a state where the optical axis of the camera is in the occlusal plane, the boundary portion where the upper and lower teeth of the subject are occluded in the captured image of the camera is linear. Therefore, by confirming the boundary portion with the photographed image of the camera, it is possible to determine whether or not the subject's jaw is in an appropriate posture for X-ray photography, that is, whether or not the subject's Frankfurt plane is parallel to the horizontal plane. As a result, the subject's head can be easily positioned.

  Another characteristic configuration is that the optical axis of the camera has an inclination angle of 10 to 15 degrees with respect to the horizontal plane.

  The occlusal plane is inclined at an average of 12 degrees with respect to the Frankfurt plane. Therefore, in this configuration, in consideration of individual differences, the camera is arranged such that the optical axis of the camera is inclined at 10 to 15 degrees with respect to the horizontal plane. Thus, by positioning the camera so that the tilt angle of the optical axis of the camera with respect to the horizontal plane is within a narrow range including 12 degrees, the optical axis of the camera is set to the occlusal plane in positioning the head of the subject. It is easy to position it above, and the Frankfurt plane can be easily made parallel to the horizontal plane. Thereby, the subject's head positioning based on the image captured by the camera can be performed with higher accuracy by a simple method.

  Another feature is that it has a gaze derivative for guiding the gaze of the subject on a virtual parallel line that is 60 to 80 mm above the optical axis of the camera in the vertical direction of the horizontal plane and parallel to the optical axis. It is in.

  The angle of the Frankfurt plane with respect to the horizontal plane changes according to the inclination of the head of the subject whose jaw is placed on the jaw positioning portion. When the Frankfurt plane is parallel to the horizontal plane, the occlusal plane is inclined forward and downward with respect to the horizontal plane. From this, it is understood that when the subject's head is tilted forward, the Frankfurt plane is likely to be parallel to the horizontal plane.

  Therefore, in this configuration, a visual line derivative for guiding the visual line of the subject is provided on a virtual parallel line that is 60 to 80 mm above the optical axis of the camera in the vertical direction of the horizontal plane and parallel to the optical axis. The optical axis of the camera is directed obliquely upward with respect to the horizontal plane, and the front of the jaw is photographed by the camera. Further, in the subject, the distance from the occlusal position of the tooth to the viewpoint position is usually within 60 to 80 mm.

  In other words, the gaze derivative is disposed at a position lower than the position of the eye of the subject on which the jaw is placed on the jaw positioning unit, and the subject directly views the gaze derivative according to an operator's instruction or the like, so that the subject's head Becomes a forward leaning posture. Thereby, a test subject can be positioned so that a Frankfurt plane may become parallel to a horizontal plane using a test subject's own operation. As a result, the subject's head can be positioned more easily.

  Another characteristic configuration is that the line-of-sight derivative is disposed on the support column.

  In the dental X-ray imaging apparatus, the support can be provided with a camera that captures the front direction of the subject's jaw supported by the jaw positioning unit, and extends upward from the position of the camera. . That is, there is a space for placing the line-of-sight derivative above the optical axis of the camera in the support column. Therefore, in this configuration, the line-of-sight derivative is disposed on the support column. Thereby, members, such as a bracket for arrange | positioning a gaze derivative, become unnecessary. As a result, the line-of-sight derivative can be easily arranged in the dental X-ray imaging apparatus.

It is a perspective view of a dental X-ray imaging apparatus. It is a partial side view of a dental X-ray imaging apparatus. It is a partial front view of a dental X-ray imaging apparatus. It is a plane sectional view showing the photography state by the 1st camera and the 2nd camera. It is a block block diagram of a dental X-ray imaging apparatus. It is a side view which shows the imaging | photography state by a 1st camera. It is a figure which shows an example of the picked-up image of the 1st camera displayed on a monitor part. It is a figure which shows an example of the picked-up image of the 2nd camera displayed on a monitor part. It is a partial side view which shows the X-ray imaging apparatus of another form. It is a figure which shows the gaze derivative of another form. It is a figure which shows the gaze derivative of another form. It is a figure which shows the gaze derivative of another form.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The dental X-ray imaging apparatus A shown in FIGS. 1 to 6 has a panoramic tomography mode and a CT tomography mode. The X-ray imaging apparatus A has a swing arm 10 having an X-ray generation unit 2 and an X-ray detection unit 3, an arm support unit 20 that supports the swing arm 10 so as to be capable of swinging, and an arm support unit 20 that can be moved up and down. And a supporting column 30 to be provided. In the swivel arm 10, the X-ray generation unit 2 and the X-ray detection unit 3 are configured to be arranged to face each other. The support column 30 includes a support column body 31 that is erected on a base 40 that is installed on the floor surface, and a lift body 32 that is attached to the support column body 31 so as to be movable up and down. The arm support unit 20 is attached to the upper part of the lifting body 32 and moves up and down together with the lifting body 32. The elevating body 32 is configured to be movable up and down with respect to the column main body 31 via an elevating mechanism (not shown) such as a motor.

  The swivel arm 10 includes an X-ray generator 2 and an X-ray detector 3. The turning arm 10 is attached to the arm support portion 20 so as to be turnable about the rotation axis P. In the swivel arm 10, the X-ray generation unit 2 and the X-ray detection unit 3 are provided so as to face each other with the rotation axis P therebetween. The X-ray detection unit 3 is configured to be retractable from a position disposed opposite to the X-ray generation unit 2. In the present embodiment, the X-ray detection unit 3 is configured to be movable around the rotation axis P of the revolving arm 10 independently of the position facing the X-ray generation unit 2.

  The X-ray generation unit 2 includes an X-ray generator such as an X-ray tube and a slit or the like that regulates the spread of the X-ray beam, and the X-ray detection unit 3 includes an X-ray such as a CCD sensor that spreads two-dimensionally. It is constituted by a line detector.

  The X-ray imaging apparatus A uses the vertical direction in which the elevating body 32 moves up and down as the Z axis, the X axis orthogonal to the Z axis (for example, the extending direction of the arm support portion 20), and the Y axis (for example, the lateral width of the arm support portion 20). The position of at least the swivel arm 10 is controlled in the two dimensions of the X axis direction and the Y axis direction. The swivel arm 10 is capable of two-dimensional movement in a horizontal plane area by an XY table (not shown) built in the arm support portion 20.

  A jaw positioning unit 50 that supports the jaw of the subject B is provided below the swivel arm 10. As shown in FIGS. 2 and 3, the jaw positioning unit 50 includes a support frame 51 and a main body 52. One end of a support frame 51 is attached to the elevating body 32, and a main body 52 is disposed on the other end of the support frame 51. Thereby, the jaw positioning part 50 is supported by the support | pillar part 30 so that raising / lowering is possible, and the turning arm 10 and the jaw positioning part 50 move up and down integrally with the raising / lowering body 32 moving up and down.

  The main body 52 is provided with a head fixing portion 53 for fixing the head of the subject B, and the support frame 51 is provided with a handle 54 for the subject B to grasp. The head fixing unit 53 includes a chin rest 55 for supporting the subject's B jaw and a pair of side head holders 56 in order to stably fix the head of the subject B during photographing. The temporal head retainers 56 are arranged on the left and right to fix the temporal head. The distance between the pair of side head holders 56 can be adjusted by a dial 57 provided on the side of the chin rest 55. A bite block 58 for opening subject B is provided at the top of the chin rest 55.

  A first camera 33 is attached in the vicinity of the support frame 51 of the jaw positioning unit 50, and a second camera 34 is provided in the X-ray generation unit 2 of the turning arm 10. The first camera 33 and the second camera 34 are provided for photographing a face part including the jaw part of the subject B supported by the jaw positioning part 50. In the present embodiment, the first camera 33 is provided on a camera support 35 attached to the lifting body 32. The support frame 51 extends from the camera support 35. The first camera 33 and the second camera 34 are configured not only as photographic cameras but also as video cameras capable of continuous shooting. The first camera 33 can photograph from the front direction of the jaw part of the subject B supported by the jaw positioning unit 50 and moves up and down together with the jaw positioning unit 50 to obtain an image of the front surface of the subject B jaw. . On the other hand, the second camera 34 acquires an image of the side surface of the jaw of the subject B by moving the X-ray generation unit 2 to the side position of the subject B in the turning arm 10.

  Hereinafter, the relationship between the Frankfurt plane F and the occlusal plane G of the subject B and the first camera 33 will be described with reference to FIG. As shown in FIG. 8, when the subject B is positioned so that the Frankfurt plane F is parallel to the horizontal plane H shown in FIG. 6, the anatomical structure of the jaw of the subject B is obtained in panoramic radiography. It is known that pictures are taken clearly. Here, the horizontal plane H is a plane parallel to the placement surface (for example, the floor surface) of the X-ray imaging apparatus A. The occlusal plane G, which is a plane with which the upper and lower teeth contact, has a predetermined angle with respect to the Frankfurt plane F. When the Frankfurt plane F is parallel to the horizontal plane H, the occlusal plane G moves from the horizontal plane H to the front of the subject B. It will be tilted downward. Therefore, in the present embodiment, as shown in FIG. 6, the first camera 33 is arranged so that the optical axis C of the first camera 33 is directed obliquely upward with respect to the horizontal plane H, and the jaw positioning unit 50 is arranged. The jaw of subject B supported by is photographed.

  Thereby, the optical axis C of the 1st camera 33 can be located on the occlusal plane G (refer FIG. 8). In a state where the optical axis C of the first camera 33 is on the occlusal plane G, the occlusal site where the upper and lower teeth of the subject B are occluded in the photographed image (first image 33a) of the first camera 33 is linear (FIG. 7). reference). An occlusal line D, which is a straight line extending in the horizontal direction, is superimposed on the first image 33a. Accordingly, by confirming that the occlusal site and the occlusal line D overlap with each other in the captured image of the first camera 33, the proper posture for subject X's jaw to perform X-ray imaging, that is, the subject B's Frankfurt It can be determined whether or not the plane F is parallel to the horizontal plane H. As a result, it is possible to easily position the head of the subject B.

  The occlusal plane G is inclined at an average of 12 degrees with respect to the Frankfurt plane F. For this reason, in consideration of individual differences, it is preferable to arrange the first camera 33 so that the optical axis C is inclined upward by 10 to 15 degrees with respect to the horizontal plane H. As described above, in positioning the head of the subject B, the first camera 33 is arranged so that the inclination angle of the optical axis C of the first camera 33 with respect to the horizontal plane H is within a narrow range including 12 degrees. The optical axis C of the first camera 33 can be easily positioned on the occlusal plane G, and the Frankfurt plane F can be easily made parallel to the horizontal plane H. Thereby, the head positioning of the subject B based on the captured image of the first camera 33 can be performed with higher accuracy by a simple method.

  As shown in FIG. 6, the X-ray imaging apparatus A is on a virtual parallel line K that is 60 to 80 mm above the optical axis C of the first camera 33 in the vertical direction of the horizontal plane H and parallel to the optical axis C. It has a gaze derivative 70 for guiding the gaze of the subject B. In the present embodiment, as shown in FIGS. 1 to 3, the subject B is positioned 60-60 mm above the intersection of the first camera 33 and the optical axis C in the lifting body 32 of the support column 30. A visual line derivative 70 for guiding the visual line is arranged. In the subject, the distance from the occlusal position of the tooth to the viewpoint position is usually within 60 to 80 mm. The line-of-sight derivative 70 is disposed at a position lower than the position of the eye of the subject B on which the jaw is placed on the jaw positioning unit 50, and the subject B directly views the line-of-sight derivative 70 according to an operator's instruction or the like. B's head is tilted forward. Accordingly, the subject B can be positioned so that the Frankfurt plane F is parallel to the horizontal plane H by using the motion of the subject B itself. As a result, it is possible to more easily position the head of the subject B. In the present embodiment, the visual line derivative 70 is formed of a circular seal body. The shape of the sealing body is not limited to a circular shape, and may be other shapes such as a triangle and a quadrangle.

  An operation panel 60 (an example of a monitor unit) is attached to the support frame 51 of the jaw positioning unit 50 via a bracket 51a. The operation panel 60 is attached to the support frame 51 so that the posture can be changed. The operation panel 60 is configured to be able to display captured images captured by the first camera 33 and the second camera 34. The operation panel 60 is constituted by, for example, a touch panel, icons for instructing various operations of the X-ray imaging apparatus A are displayed, and the operations are selected by touching the corresponding icons.

  FIG. 5 is a block diagram of the X-ray imaging apparatus A. The X-ray imaging apparatus A is configured to include a control unit 80. The control unit 80 controls the X-ray generation unit 2, the X-ray detection unit 3, the turning arm 10, the lifting body 32, the first camera 33 and the second camera 34, the head fixing unit 53, and the like. The control unit 80 controls display on the operation panel 60 and can execute various controls based on instructions from the operation panel 60. The operation panel 60 is detachable from the support frame 51 and is configured to be able to communicate with the control unit 80 even in the detached state.

  Next, a method for using the X-ray imaging apparatus A will be described. Before guiding the subject B to the X-ray imaging apparatus A, the X-ray generator 2 and the X-ray detector 3 face each other from the state where the X-ray generator 2 and the X-ray detector 3 face each other, as shown in FIG. In contrast, the X-ray detection unit 3 that does not have the second camera 34 is independently moved around the rotation axis P of the turning arm 10. As a result, as indicated by a two-dot chain line in FIG. 4, the X-ray detection unit 3 is on the right side of the subject B in the same manner as the X-ray generation unit 2, and the imaging region 33S of the first camera 33 and the second camera 34 It can be moved to a position that does not overlap any of the imaging regions 34S. After the subject B is guided to the X-ray imaging apparatus A, the X-ray detector 3 may be moved around the rotation axis P of the swivel arm 10 independently of the X-ray generator 2.

  Thus, in the turning arm 10, the rotation of the turning arm 10 independently from the position where the X-ray detection unit 3 that does not have the second camera 34 is opposed to the X-ray generation unit 2 that has the second camera 34. Retreat by moving around the axis P. Since the X-ray detection unit 3 moves around the rotation axis P, the X-ray detection unit 3 can be accommodated in the turning area of the turning arm 10 even after retraction. Accordingly, the X-ray detection unit 3 can be removed from the imaging region 34S of the second camera 34. Further, a space for the operator can be secured at a position facing the second camera 34 across the subject B, so that the operator can adjust the X-ray imaging apparatus A from the side of the subject B and use the operation panel 60. A photographed image can be confirmed. As a result, the surgeon can easily position the head of the subject B.

  Next, the subject B is guided to the jaw positioning unit 50 of the X-ray imaging apparatus A, and the head of the subject B is positioned. At this time, the surgeon can adjust the X-ray imaging apparatus A while directly looking at the side of the face of the subject B by being positioned on the left side of the subject B where the X-ray detection unit 3 does not exist. The surgeon adjusts the height of the chin rest 55 so that the jaw of the subject B is placed on the chin rest 55 and causes the subject B to bite the bite block 58. In this state, the surgeon instructs the subject B to look at the gaze derivative 70.

  The surgeon displays the front image of the subject B displayed on the operation panel 60 (first image 33a photographed by the first camera 33) and the side image of the subject B (second image 34a photographed by the second camera 34). ) And finely adjust the height of the chin rest 55.

  An example of the first image 33a displayed on the operation panel 60 is shown in FIG. 7, and an example of the second image 34a is shown in FIG. As shown in FIG. 7, when the occlusal site where the upper and lower teeth of the subject B are occluded overlaps with the occlusion line D in the first image 33 a and appears in a straight line, It can be determined that the proper posture, that is, the Frankfurt plane F of the subject B is parallel to the horizontal plane H shown in FIG. On the other hand, as shown in FIG. 8, the second image 34a, which is a side image, is configured such that the index line of the Frankfurt plane F and the index line of the occlusal plane G are superimposed. If the occlusal site is shown in a straight line, the index line of the Frankfurt plane F passing near the ear of the subject B is superimposed and displayed so as to be parallel to the horizontal plane H, and the horizontal plane H passing near the occlusal portion of the subject B is used as a reference. The index line of the occlusal plane G inclined forward and downward of the subject B is displayed in a superimposed manner. The surgeon can easily position the head of the subject B by referring to the occlusion line D and the index lines of the Frankfurt plane F and the occlusion plane G in the first image 33a and the second image 34a.

  Based on the first image 33a and the second image 34a and the direct view of the subject B, the temporal position of the subject B is fixed after confirming that the position and posture of the jaw of the subject B are appropriate.

  When the positioning of the head of the subject B is completed, camera scout designation for X-ray imaging is performed using the first camera 33 and the second camera 34. As shown in FIG. 7, the first image 33a is configured to be able to display a rectangular index line E for designating an imaging region. The size and shape of the area specified by the index line E can be changed as appropriate. As shown in FIG. 8, the second image 34a is configured to be able to display the same index line J as that of the first image 33a.

  In the case of panoramic tomography, the median position is designated by the index line E of the first image 33a shown in FIG. 7, and the canine position is designated by the index line J of the second image 34a shown in FIG. In the case of CT tomography, the imaging region in the left-right direction of the face is designated by the index line E of the first image 33a shown in FIG. 7, and the face of the face is designated by the index line J of the second image 34a shown in FIG. Specify the shooting area in the front-rear direction. When the control unit 80 receives designation of an imaging region from the operation panel 60, the control unit 80 transmits a control signal to the X-ray generation unit 2, the X-ray detection unit 3, and the turning arm 10. As a result, the X-ray generation unit 2 and the X-ray detection unit 3 move to a position where the designated imaging region can be imaged, and the X-ray irradiation region is adjusted in the X-ray generation unit 2, so that the X-ray detection unit 3, the X-ray detection area is adjusted. Thereafter, panoramic tomography or CT tomography is started.

[Another embodiment]
(1) In the above-described embodiment, the configuration in which the first camera 33 is provided on the camera support 35 attached to the elevating body 32 of the support column 30 is shown. However, as shown in FIG. You may attach to the stay 52a extended from the main-body part 52 of the positioning part 50. FIG. Although not shown, the first camera 33 may be attached to the support frame 51 of the jaw positioning unit 50 via a bracket 51a or the like.

(2) In the above embodiment, the chin positioning unit 50 has the chin rest 55 and the bite block 58 provided on the chin rest 55. However, as shown in FIG. A configuration in which the byte block 58 is extended from the main body 52 or the like without having it is also possible.

(3) In the above-described embodiment, the example in which the second camera 34 is provided in the X-ray generation unit 2 of the turning arm 10 has been described, but the second camera 34 may be provided in the X-ray detection unit 3.

(4) Among the X-ray generation unit 2 and the X-ray detection unit 3, the configuration in which one without the second camera 34 can be retracted from the position opposite to the other with the second camera 34 is the above configuration It is not limited to the embodiment. For example, one (X-ray generation unit 2 or X-ray detection unit 3) that does not have the second camera 34 may be configured to be detachable from the revolving arm 10. By removing one (the X-ray generation unit 2 or the X-ray detection unit 3) that does not have the second camera 34 from the turning arm 10, the other that does not have the second camera 34 can be retracted from the oppositely arranged position. During X-ray imaging, one (X-ray generation unit 2 or X-ray detection unit 3) that does not have the second camera 34 is attached to the turning arm 10 again. In addition, one (X-ray generation unit 2 or X-ray detection unit 3) that does not have the second camera 34 may be configured to be movable toward the upper side of the turning arm 10.

(5) In the above-described embodiment, an example in which the line-of-sight derivative 70 is disposed on the lifting body 32 of the support column 30 has been described, but the line-of-sight derivative 70 is perpendicular to the horizontal plane H from the optical axis C of the first camera 33. As long as it exists on a virtual parallel line K parallel to the optical axis C, and may be disposed on another member. For example, a member (not shown) for disposing the line-of-sight derivative 70 is attached to the jaw positioning unit 50 (the support frame 51, the main body 52, the chin rest 55, etc.) upward, or the member (not shown) is below the arm support 20 You may attach toward.

(6) A plurality of line-of-sight derivatives 70 may be provided in the vertical direction of the lifting body 32. FIG. 10 shows an example in which the line-of-sight derivative 71 is constituted by three seal bodies 71a, 71b, 71c. For example, the plurality of seal bodies 71a to 71c may include separate cover bodies 75a to 75c, and may be configured to be switchable between a display state and a non-display state. As shown in FIG. 11, the position of the line-of-sight derivative 72 may be changeable in the vertical direction of the lifting body 32. As shown in FIG. 12, the line-of-sight derivative 73 may include a plurality of light emitters 73a, 73b, and 73c, and any one light emitter (for example, 73b) may be turned on.

  The present invention can be widely used for X-ray imaging apparatuses for the head.

2: X-ray generation unit 3: X-ray detection unit 10: Revolving arm 20: Arm support unit 30: Supporting unit 32: Lifting body 33: First camera 33a: First image 34: Second camera 34a: Second image 35 : Camera support 40: Base 50: Jaw positioning part 51: Support frame 53: Head fixing part 55: Chin rest 60: Operation panel (monitor part)
70, 71, 72, 73: Gaze derivative 80: Control unit A: X-ray imaging apparatus B: Subject C: Optical axis F: Index line (Frankfurt plane)
G: Index line (occlusion plane)
K: Virtual parallel line P: Rotation axis

The present invention relates to a dental X-ray imaging apparatus in which a subject's head is positioned, a head posture adjusting method in the dental X-ray imaging apparatus, and a gaze derivative .

  In X-ray imaging in dentistry, an operator guides a subject to an X-ray imaging apparatus, and then the operator positions the head of the subject. Specifically, the head of the subject is positioned by adjusting the device while the surgeon instructs the subject.

  In general, in panoramic X-ray photography, the head of a subject is positioned such that the Frankfurt plane is parallel to a horizontal plane (for example, a floor surface). The Frankfurt plane is a virtual plane connecting the left and right orbit lowermost points, which are front reference points, and the upper ends of both ear canals, which are rear reference points. It is known that when the Frankfurt plane is parallel to the horizontal plane, the occlusal plane tilts forward at an appropriate angle, so that the anatomical structure of the subject's jaw is clearly X-rayed in panoramic tomography. Patent Document 1 discloses an X-ray imaging apparatus including a beam generator. In this X-ray imaging apparatus, the subject is irradiated with a horizontal beam indicating the Frankfurt plane parallel to the horizontal plane from the beam generator, and the subject's head is positioned based on the horizontal beam.

JP2013-244145A

  However, in the X-ray imaging apparatus disclosed in Patent Document 1, it is not easy for the surgeon to adjust the apparatus while instructing the subject so that the Frankfurt plane follows the horizontal beam. Also, it is difficult for the subject to recognize the Frankfurt plane, and the subject may feel the horizontal beam near the field of view uncomfortable.

  In view of the above circumstances, there is a need for a dental X-ray imaging apparatus that can easily position the head of a subject.

The dental X-ray imaging apparatus according to the present invention is characterized in that a swivel arm having an X-ray generation part and an X-ray detection part, an arm support part that supports the swivel arm so as to be turnable, and the arm support part. A support column that is supported so as to be movable up and down, a jaw positioning unit that is supported by the support column so as to be movable up and down, and that supports the jaw of the subject provided between the X-ray generation unit and the X-ray detection unit; column portions and provided to either of the jaw positioning portion, a first camera photographing a can from the front direction of the jaw of the subject supported on the jaw positioning unit, the X-ray generator and said X A second camera that is provided in any one of the line detectors and that is supported by the jaw positioning unit and capable of photographing from the lateral direction of the jaw of the subject; and is disposed in the vicinity of the jaw positioning unit, Display images taken by one camera and the second camera Capable and a configured monitor, the optical axis of the first camera is directed obliquely upward with respect to the horizontal plane, the captured image of the second camera to be displayed on the monitor unit, Frankfurt The flat index line is superimposed and displayed so as to be parallel to the horizontal plane .

When the subject's head is positioned on the X-ray imaging apparatus so that the Frankfurt plane is parallel to the horizontal plane, the anatomical structure of the subject's jaw is clearly X-rayed in panoramic tomography. The occlusal plane, which is the plane in contact with the upper and lower teeth, has a predetermined angle with respect to the Frankfurt plane. When the Frankfurt plane is parallel to the horizontal plane, the occlusal plane is inclined downward from the horizontal plane toward the front of the subject. . In this configuration, the camera is arranged so that the optical axis of the first camera is directed obliquely upward with respect to the horizontal plane by the first camera provided on any one of the support column and the jaw positioning unit, The subject's jaw supported by the jaw positioning part can be photographed.

With this configuration, when the Frankfurt plane is parallel to the horizontal plane, the first camera for frontal imaging of the subject's jaw can easily be positioned on the occlusal plane. In a state where the optical axis of the first camera is in the occlusal plane, the boundary portion where the subject's upper and lower teeth are occluded in the captured image of the first camera is linear. Therefore, by confirming the boundary portion with the captured image of the first camera, it is possible to determine whether or not the subject's chin is in an appropriate posture for X-ray imaging, that is, whether or not the subject's Frankfurt plane is parallel to the horizontal plane. . As a result, the subject's head can be easily positioned.

In another characteristic configuration, an index line of an occlusal plane having a predetermined angle with respect to the Frankfurt plane is further superimposed and displayed on a captured image of the second camera displayed on the monitor unit, and the index line of the occlusal plane is displayed. Is parallel to the optical axis of the first camera.

Another characteristic configuration is that the optical axis of the first camera has an inclination angle of 10 to 15 degrees with respect to the horizontal plane.

  The occlusal plane is inclined at an average of 12 degrees with respect to the Frankfurt plane. Therefore, in this configuration, in consideration of individual differences, the camera is arranged such that the optical axis of the camera is inclined at 10 to 15 degrees with respect to the horizontal plane. Thus, by positioning the camera so that the tilt angle of the optical axis of the camera with respect to the horizontal plane is within a narrow range including 12 degrees, the optical axis of the camera is set to the occlusal plane in positioning the head of the subject. It is easy to position it above, and the Frankfurt plane can be easily made parallel to the horizontal plane. Thereby, the subject's head positioning based on the image captured by the camera can be performed with higher accuracy by a simple method.

The dental X-ray imaging apparatus according to the present invention is characterized in that a swivel arm having an X-ray generation unit and an X-ray detection unit, an arm support unit for pivotally supporting the swivel arm, and the arm support unit A support column that is supported so as to be movable up and down, a jaw positioning unit that is supported by the support column so as to be movable up and down, and that supports the jaw of the subject provided between the X-ray generation unit and the X-ray detection unit; A camera provided on one of the support column and the jaw positioning unit and capable of photographing from the front direction of the subject's jaw supported by the jaw positioning unit, the optical axis of the camera being a horizontal plane With respect to the optical axis of the camera, and a position that is lower than the position of the eye of the subject whose jaw is supported by the jaw positioning portion above the horizontal plane in the vertical direction of the horizontal plane. On a virtual parallel line parallel to the optical axis And having a gaze derivative for guiding the gaze of the subject.

Another characteristic configuration is that the visual line derivative is disposed 60 to 80 mm above the optical axis of the camera in the vertical direction of the horizontal plane.

  The angle of the Frankfurt plane with respect to the horizontal plane changes according to the inclination of the head of the subject whose jaw is placed on the jaw positioning portion. When the Frankfurt plane is parallel to the horizontal plane, the occlusal plane is inclined forward and downward with respect to the horizontal plane. From this, it is understood that when the subject's head is tilted forward, the Frankfurt plane is likely to be parallel to the horizontal plane.

Therefore, in this configuration, the position is lower than the position of the eye of the subject whose jaw is supported by the jaw positioning portion above the vertical direction of the horizontal plane from the optical axis of the first camera and parallel to the optical axis. A visual line derivative for guiding the visual line of the subject is provided on the virtual parallel line. The optical axis of the first camera is directed obliquely upward with respect to the horizontal plane, and the front of the jaw is photographed by the first camera. Further, in the subject, the distance from the occlusal position of the tooth to the viewpoint position is usually within 60 to 80 mm.

That is, the gaze derivative is disposed at a position lower than the position of the eye of the subject whose jaw is supported by the jaw positioning portion, and the subject's head is directly viewed by the subject according to an operator's instruction or the like. Becomes leaning forward. Thereby, a test subject can be positioned so that a Frankfurt plane may become parallel to a horizontal plane using a test subject's own operation. As a result, the subject's head can be positioned more easily.

  Another characteristic configuration is that the line-of-sight derivative is disposed on the support column.

  In the dental X-ray imaging apparatus, the support can be provided with a camera that captures the front direction of the subject's jaw supported by the jaw positioning unit, and extends upward from the position of the camera. . That is, there is a space for placing the line-of-sight derivative above the optical axis of the camera in the support column. Therefore, in this configuration, the line-of-sight derivative is disposed on the support column. Thereby, members, such as a bracket for arrange | positioning a gaze derivative, become unnecessary. As a result, the line-of-sight derivative can be easily arranged in the dental X-ray imaging apparatus.

The characteristic configuration of the head posture adjustment method in the dental X-ray imaging apparatus according to the present invention includes: a swivel arm having an X-ray generation unit and an X-ray detection unit; and an arm support unit that supports the swivel arm in a turnable manner. A support column that supports the arm support unit so as to be able to move up and down; a support unit that is supported by the support column so as to be able to move up and down; and supports a jaw of a subject provided between the X-ray generation unit and the X-ray detection unit A jaw positioning unit, a camera provided in any one of the X-ray generation unit and the X-ray detection unit and capable of photographing from a lateral direction of the subject's jaw supported by the jaw positioning unit; A head posture adjustment method using a dental X-ray imaging apparatus, comprising: a monitor unit arranged in the vicinity of a chin positioning unit and configured to be able to display an image captured by the camera; The gaze derivative to be guided is The jaw is positioned at a position lower than the position of the eye of the subject whose jaw is supported by the jaw positioning unit, and the jaw positioning unit is positioned on the jaw positioning unit while referring to a photographed image of the camera displayed on the monitor unit. It is in the point which adjusts the test subject's head posture to a predetermined forward tilt posture by making the subject who supported the part look directly at the gaze derivative.

The line-of-sight derivative according to the present invention is characterized in that a swivel arm having an X-ray generation unit and an X-ray detection unit, an arm support unit that supports the swivel arm so as to be swivel, and a support unit that can be moved up and down. A dental X comprising: a supporting column portion; and a jaw positioning portion that is supported by the supporting column portion so as to be movable up and down and supports a jaw portion of a subject provided between the X-ray generation unit and the X-ray detection unit. A line-of-sight derivative arranged in a radiographic apparatus, wherein the head posture of the subject whose jaw is supported by the jaw positioning unit is tilted to a predetermined forward direction when performing X-ray imaging by the dental X-ray apparatus It is used to make a posture, and is arranged at a position lower than the position of the eye of the subject whose jaw is supported by the jaw positioning portion and in the vicinity of the support column, thereby guiding the line of sight of the subject.

It is a perspective view of a dental X-ray imaging apparatus. It is a partial side view of a dental X-ray imaging apparatus. It is a partial front view of a dental X-ray imaging apparatus. It is a plane sectional view showing the photography state by the 1st camera and the 2nd camera. It is a block block diagram of a dental X-ray imaging apparatus. It is a side view which shows the imaging | photography state by a 1st camera. It is a figure which shows an example of the picked-up image of the 1st camera displayed on a monitor part. It is a figure which shows an example of the picked-up image of the 2nd camera displayed on a monitor part. It is a partial side view which shows the X-ray imaging apparatus of another form. It is a figure which shows the gaze derivative of another form. It is a figure which shows the gaze derivative of another form. It is a figure which shows the gaze derivative of another form.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The dental X-ray imaging apparatus A shown in FIGS. 1 to 6 has a panoramic tomography mode and a CT tomography mode. The X-ray imaging apparatus A has a swing arm 10 having an X-ray generation unit 2 and an X-ray detection unit 3, an arm support unit 20 that supports the swing arm 10 so as to be capable of swinging, and an arm support unit 20 that can be moved up and down. And a supporting column 30 to be provided. In the swivel arm 10, the X-ray generation unit 2 and the X-ray detection unit 3 are configured to be arranged to face each other. The support column 30 includes a support column body 31 that is erected on a base 40 that is installed on the floor surface, and a lift body 32 that is attached to the support column body 31 so as to be movable up and down. The arm support unit 20 is attached to the upper part of the lifting body 32 and moves up and down together with the lifting body 32. The elevating body 32 is configured to be movable up and down with respect to the column main body 31 via an elevating mechanism (not shown) such as a motor.

  The swivel arm 10 includes an X-ray generator 2 and an X-ray detector 3. The turning arm 10 is attached to the arm support portion 20 so as to be turnable about the rotation axis P. In the swivel arm 10, the X-ray generation unit 2 and the X-ray detection unit 3 are provided so as to face each other with the rotation axis P therebetween. The X-ray detection unit 3 is configured to be retractable from a position disposed opposite to the X-ray generation unit 2. In the present embodiment, the X-ray detection unit 3 is configured to be movable around the rotation axis P of the revolving arm 10 independently of the position facing the X-ray generation unit 2.

  The X-ray generation unit 2 includes an X-ray generator such as an X-ray tube and a slit or the like that regulates the spread of the X-ray beam, and the X-ray detection unit 3 includes an X-ray such as a CCD sensor that spreads two-dimensionally. It is constituted by a line detector.

  The X-ray imaging apparatus A uses the vertical direction in which the elevating body 32 moves up and down as the Z axis, the X axis orthogonal to the Z axis (for example, the extending direction of the arm support portion 20), and the Y axis (for example, the lateral width of the arm support portion 20). The position of at least the swivel arm 10 is controlled in the two dimensions of the X axis direction and the Y axis direction. The swivel arm 10 is capable of two-dimensional movement in a horizontal plane area by an XY table (not shown) built in the arm support portion 20.

  A jaw positioning unit 50 that supports the jaw of the subject B is provided below the swivel arm 10. As shown in FIGS. 2 and 3, the jaw positioning unit 50 includes a support frame 51 and a main body 52. One end of a support frame 51 is attached to the elevating body 32, and a main body 52 is disposed on the other end of the support frame 51. Thereby, the jaw positioning part 50 is supported by the support | pillar part 30 so that raising / lowering is possible, and the turning arm 10 and the jaw positioning part 50 move up and down integrally with the raising / lowering body 32 moving up and down.

  The main body 52 is provided with a head fixing portion 53 for fixing the head of the subject B, and the support frame 51 is provided with a handle 54 for the subject B to grasp. The head fixing unit 53 includes a chin rest 55 for supporting the subject's B jaw and a pair of side head holders 56 in order to stably fix the head of the subject B during photographing. The temporal head retainers 56 are arranged on the left and right to fix the temporal head. The distance between the pair of side head holders 56 can be adjusted by a dial 57 provided on the side of the chin rest 55. A bite block 58 for opening subject B is provided at the top of the chin rest 55.

  A first camera 33 is attached in the vicinity of the support frame 51 of the jaw positioning unit 50, and a second camera 34 is provided in the X-ray generation unit 2 of the turning arm 10. The first camera 33 and the second camera 34 are provided for photographing a face part including the jaw part of the subject B supported by the jaw positioning part 50. In the present embodiment, the first camera 33 is provided on a camera support 35 attached to the lifting body 32. The support frame 51 extends from the camera support 35. The first camera 33 and the second camera 34 are configured not only as photographic cameras but also as video cameras capable of continuous shooting. The first camera 33 can photograph from the front direction of the jaw part of the subject B supported by the jaw positioning unit 50 and moves up and down together with the jaw positioning unit 50 to obtain an image of the front surface of the subject B jaw. . On the other hand, the second camera 34 acquires an image of the side surface of the jaw of the subject B by moving the X-ray generation unit 2 to the side position of the subject B in the turning arm 10.

  Hereinafter, the relationship between the Frankfurt plane F and the occlusal plane G of the subject B and the first camera 33 will be described with reference to FIG. As shown in FIG. 8, when the subject B is positioned so that the Frankfurt plane F is parallel to the horizontal plane H shown in FIG. 6, the anatomical structure of the jaw of the subject B is obtained in panoramic radiography. It is known that pictures are taken clearly. Here, the horizontal plane H is a plane parallel to the placement surface (for example, the floor surface) of the X-ray imaging apparatus A. The occlusal plane G, which is a plane with which the upper and lower teeth contact, has a predetermined angle with respect to the Frankfurt plane F. When the Frankfurt plane F is parallel to the horizontal plane H, the occlusal plane G moves from the horizontal plane H to the front of the subject B. It will be tilted downward. Therefore, in the present embodiment, as shown in FIG. 6, the first camera 33 is arranged so that the optical axis C of the first camera 33 is directed obliquely upward with respect to the horizontal plane H, and the jaw positioning unit 50 is arranged. The jaw of subject B supported by is photographed.

  Thereby, the optical axis C of the 1st camera 33 can be located on the occlusal plane G (refer FIG. 8). In a state where the optical axis C of the first camera 33 is on the occlusal plane G, the occlusal site where the upper and lower teeth of the subject B are occluded in the photographed image (first image 33a) of the first camera 33 is linear (FIG. 7). reference). An occlusal line D, which is a straight line extending in the horizontal direction, is superimposed on the first image 33a. Accordingly, by confirming that the occlusal site and the occlusal line D overlap with each other in the captured image of the first camera 33, the proper posture for subject X's jaw to perform X-ray imaging, that is, the subject B's Frankfurt It can be determined whether or not the plane F is parallel to the horizontal plane H. As a result, it is possible to easily position the head of the subject B.

  The occlusal plane G is inclined at an average of 12 degrees with respect to the Frankfurt plane F. For this reason, in consideration of individual differences, it is preferable to arrange the first camera 33 so that the optical axis C is inclined upward by 10 to 15 degrees with respect to the horizontal plane H. As described above, in positioning the head of the subject B, the first camera 33 is arranged so that the inclination angle of the optical axis C of the first camera 33 with respect to the horizontal plane H is within a narrow range including 12 degrees. The optical axis C of the first camera 33 can be easily positioned on the occlusal plane G, and the Frankfurt plane F can be easily made parallel to the horizontal plane H. Thereby, the head positioning of the subject B based on the captured image of the first camera 33 can be performed with higher accuracy by a simple method.

  As shown in FIG. 6, the X-ray imaging apparatus A is on a virtual parallel line K that is 60 to 80 mm above the optical axis C of the first camera 33 in the vertical direction of the horizontal plane H and parallel to the optical axis C. It has a gaze derivative 70 for guiding the gaze of the subject B. In the present embodiment, as shown in FIGS. 1 to 3, the subject B is positioned 60-60 mm above the intersection of the first camera 33 and the optical axis C in the lifting body 32 of the support column 30. A visual line derivative 70 for guiding the visual line is arranged. In the subject, the distance from the occlusal position of the tooth to the viewpoint position is usually within 60 to 80 mm. The line-of-sight derivative 70 is disposed at a position lower than the position of the eye of the subject B on which the jaw is placed on the jaw positioning unit 50, and the subject B directly views the line-of-sight derivative 70 according to an operator's instruction or the like. B's head is tilted forward. Accordingly, the subject B can be positioned so that the Frankfurt plane F is parallel to the horizontal plane H by using the motion of the subject B itself. As a result, it is possible to more easily position the head of the subject B. In the present embodiment, the visual line derivative 70 is formed of a circular seal body. The shape of the sealing body is not limited to a circular shape, and may be other shapes such as a triangle and a quadrangle.

  An operation panel 60 (an example of a monitor unit) is attached to the support frame 51 of the jaw positioning unit 50 via a bracket 51a. The operation panel 60 is attached to the support frame 51 so that the posture can be changed. The operation panel 60 is configured to be able to display captured images captured by the first camera 33 and the second camera 34. The operation panel 60 is constituted by, for example, a touch panel, icons for instructing various operations of the X-ray imaging apparatus A are displayed, and the operations are selected by touching the corresponding icons.

  FIG. 5 is a block diagram of the X-ray imaging apparatus A. The X-ray imaging apparatus A is configured to include a control unit 80. The control unit 80 controls the X-ray generation unit 2, the X-ray detection unit 3, the turning arm 10, the lifting body 32, the first camera 33 and the second camera 34, the head fixing unit 53, and the like. The control unit 80 controls display on the operation panel 60 and can execute various controls based on instructions from the operation panel 60. The operation panel 60 is detachable from the support frame 51 and is configured to be able to communicate with the control unit 80 even in the detached state.

  Next, a method for using the X-ray imaging apparatus A will be described. Before guiding the subject B to the X-ray imaging apparatus A, the X-ray generator 2 and the X-ray detector 3 face each other from the state where the X-ray generator 2 and the X-ray detector 3 face each other, as shown in FIG. In contrast, the X-ray detection unit 3 that does not have the second camera 34 is independently moved around the rotation axis P of the turning arm 10. As a result, as indicated by a two-dot chain line in FIG. 4, the X-ray detection unit 3 is on the right side of the subject B in the same manner as the X-ray generation unit 2, and the imaging region 33S of the first camera 33 and the second camera 34 It can be moved to a position that does not overlap any of the imaging regions 34S. After the subject B is guided to the X-ray imaging apparatus A, the X-ray detector 3 may be moved around the rotation axis P of the swivel arm 10 independently of the X-ray generator 2.

  Thus, in the turning arm 10, the rotation of the turning arm 10 independently from the position where the X-ray detection unit 3 that does not have the second camera 34 is opposed to the X-ray generation unit 2 that has the second camera 34. Retreat by moving around the axis P. Since the X-ray detection unit 3 moves around the rotation axis P, the X-ray detection unit 3 can be accommodated in the turning area of the turning arm 10 even after retraction. Accordingly, the X-ray detection unit 3 can be removed from the imaging region 34S of the second camera 34. Further, a space for the operator can be secured at a position facing the second camera 34 across the subject B, so that the operator can adjust the X-ray imaging apparatus A from the side of the subject B and use the operation panel 60. A photographed image can be confirmed. As a result, the surgeon can easily position the head of the subject B.

  Next, the subject B is guided to the jaw positioning unit 50 of the X-ray imaging apparatus A, and the head of the subject B is positioned. At this time, the surgeon can adjust the X-ray imaging apparatus A while directly looking at the side of the face of the subject B by being positioned on the left side of the subject B where the X-ray detection unit 3 does not exist. The surgeon adjusts the height of the chin rest 55 so that the jaw of the subject B is placed on the chin rest 55 and causes the subject B to bite the bite block 58. In this state, the surgeon instructs the subject B to look at the gaze derivative 70.

  The surgeon displays the front image of the subject B displayed on the operation panel 60 (first image 33a photographed by the first camera 33) and the side image of the subject B (second image 34a photographed by the second camera 34). ) And finely adjust the height of the chin rest 55.

  An example of the first image 33a displayed on the operation panel 60 is shown in FIG. 7, and an example of the second image 34a is shown in FIG. As shown in FIG. 7, when the occlusal site where the upper and lower teeth of the subject B are occluded overlaps with the occlusion line D in the first image 33 a and appears in a straight line, It can be determined that the proper posture, that is, the Frankfurt plane F of the subject B is parallel to the horizontal plane H shown in FIG. On the other hand, as shown in FIG. 8, the second image 34a, which is a side image, is configured such that the index line of the Frankfurt plane F and the index line of the occlusal plane G are superimposed. If the occlusal site is shown in a straight line, the index line of the Frankfurt plane F passing near the ear of the subject B is superimposed and displayed so as to be parallel to the horizontal plane H, and the horizontal plane H passing near the occlusal portion of the subject B is used as a reference. The index line of the occlusal plane G inclined forward and downward of the subject B is displayed in a superimposed manner. The surgeon can easily position the head of the subject B by referring to the occlusion line D and the index lines of the Frankfurt plane F and the occlusion plane G in the first image 33a and the second image 34a.

  Based on the first image 33a and the second image 34a and the direct view of the subject B, the temporal position of the subject B is fixed after confirming that the position and posture of the jaw of the subject B are appropriate.

  When the positioning of the head of the subject B is completed, camera scout designation for X-ray imaging is performed using the first camera 33 and the second camera 34. As shown in FIG. 7, the first image 33a is configured to be able to display a rectangular index line E for designating an imaging region. The size and shape of the area specified by the index line E can be changed as appropriate. As shown in FIG. 8, the second image 34a is configured to be able to display the same index line J as that of the first image 33a.

  In the case of panoramic tomography, the median position is designated by the index line E of the first image 33a shown in FIG. 7, and the canine position is designated by the index line J of the second image 34a shown in FIG. In the case of CT tomography, the imaging region in the left-right direction of the face is designated by the index line E of the first image 33a shown in FIG. 7, and the face of the face is designated by the index line J of the second image 34a shown in FIG. Specify the shooting area in the front-rear direction. When the control unit 80 receives designation of an imaging region from the operation panel 60, the control unit 80 transmits a control signal to the X-ray generation unit 2, the X-ray detection unit 3, and the turning arm 10. As a result, the X-ray generation unit 2 and the X-ray detection unit 3 move to a position where the designated imaging region can be imaged, and the X-ray irradiation region is adjusted in the X-ray generation unit 2, so that the X-ray detection unit 3, the X-ray detection area is adjusted. Thereafter, panoramic tomography or CT tomography is started.

[Another embodiment]
(1) In the above-described embodiment, the configuration in which the first camera 33 is provided on the camera support 35 attached to the elevating body 32 of the support column 30 is shown. However, as shown in FIG. You may attach to the stay 52a extended from the main-body part 52 of the positioning part 50. FIG. Although not shown, the first camera 33 may be attached to the support frame 51 of the jaw positioning unit 50 via a bracket 51a or the like.

(2) In the above embodiment, the chin positioning unit 50 has the chin rest 55 and the bite block 58 provided on the chin rest 55. However, as shown in FIG. A configuration in which the byte block 58 is extended from the main body 52 or the like without having it is also possible.

(3) In the above-described embodiment, the example in which the second camera 34 is provided in the X-ray generation unit 2 of the turning arm 10 has been described, but the second camera 34 may be provided in the X-ray detection unit 3.

(4) Among the X-ray generation unit 2 and the X-ray detection unit 3, the configuration in which one without the second camera 34 can be retracted from the position opposite to the other with the second camera 34 is the above configuration It is not limited to the embodiment. For example, one (X-ray generation unit 2 or X-ray detection unit 3) that does not have the second camera 34 may be configured to be detachable from the revolving arm 10. By removing one (the X-ray generation unit 2 or the X-ray detection unit 3) that does not have the second camera 34 from the turning arm 10, the other that does not have the second camera 34 can be retracted from the oppositely arranged position. During X-ray imaging, one (X-ray generation unit 2 or X-ray detection unit 3) that does not have the second camera 34 is attached to the turning arm 10 again. In addition, one (X-ray generation unit 2 or X-ray detection unit 3) that does not have the second camera 34 may be configured to be movable toward the upper side of the turning arm 10.

(5) In the above-described embodiment, an example in which the line-of-sight derivative 70 is disposed on the lifting body 32 of the support column 30 has been described, but the line-of-sight derivative 70 is perpendicular to the horizontal plane H from the optical axis C of the first camera 33. As long as it exists on a virtual parallel line K parallel to the optical axis C, and may be disposed on another member. For example, a member (not shown) for disposing the line-of-sight derivative 70 is attached to the jaw positioning unit 50 (the support frame 51, the main body 52, the chin rest 55, etc.) upward, or the member (not shown) is below the arm support 20 You may attach toward.

(6) A plurality of line-of-sight derivatives 70 may be provided in the vertical direction of the lifting body 32. FIG. 10 shows an example in which the line-of-sight derivative 71 is constituted by three seal bodies 71a, 71b, 71c. For example, the plurality of seal bodies 71a to 71c may include separate cover bodies 75a to 75c, and may be configured to be switchable between a display state and a non-display state. As shown in FIG. 11, the position of the line-of-sight derivative 72 may be changeable in the vertical direction of the lifting body 32. As shown in FIG. 12, the line-of-sight derivative 73 may include a plurality of light emitters 73a, 73b, and 73c, and any one light emitter (for example, 73b) may be turned on.

  The present invention can be widely used for X-ray imaging apparatuses for the head.

2: X-ray generation unit 3: X-ray detection unit 10: Revolving arm 20: Arm support unit 30: Supporting unit 32: Lifting body 33: First camera 33a: First image 34: Second camera 34a: Second image 35 : Camera support 40: Base 50: Jaw positioning part 51: Support frame 53: Head fixing part 55: Chin rest 60: Operation panel (monitor part)
70, 71, 72, 73: Gaze derivative 80: Control unit A: X-ray imaging apparatus B: Subject C: Optical axis F: Index line (Frankfurt plane)
G: Index line (occlusion plane)
K: Virtual parallel line P: Rotation axis

The present invention relates to a dental X-ray imaging equipment for head positioning of the subject is performed.

  In X-ray imaging in dentistry, an operator guides a subject to an X-ray imaging apparatus, and then the operator positions the head of the subject. Specifically, the head of the subject is positioned by adjusting the device while the surgeon instructs the subject.

  In general, in panoramic X-ray photography, the head of a subject is positioned such that the Frankfurt plane is parallel to a horizontal plane (for example, a floor surface). The Frankfurt plane is a virtual plane connecting the left and right orbit lowermost points, which are front reference points, and the upper ends of both ear canals, which are rear reference points. It is known that when the Frankfurt plane is parallel to the horizontal plane, the occlusal plane tilts forward at an appropriate angle, so that the anatomical structure of the subject's jaw is clearly X-rayed in panoramic tomography. Patent Document 1 discloses an X-ray imaging apparatus including a beam generator. In this X-ray imaging apparatus, the subject is irradiated with a horizontal beam indicating the Frankfurt plane parallel to the horizontal plane from the beam generator, and the subject's head is positioned based on the horizontal beam.

JP2013-244145A

  However, in the X-ray imaging apparatus disclosed in Patent Document 1, it is not easy for the surgeon to adjust the apparatus while instructing the subject so that the Frankfurt plane follows the horizontal beam. Also, it is difficult for the subject to recognize the Frankfurt plane, and the subject may feel the horizontal beam near the field of view uncomfortable.

  In view of the above circumstances, there is a need for a dental X-ray imaging apparatus that can easily position the head of a subject.

The dental X-ray imaging apparatus according to the present invention is characterized in that a swivel arm having an X-ray generation part and an X-ray detection part, an arm support part that supports the swivel arm so as to be turnable, and the arm support part. A support column that is supported so as to be movable up and down, a jaw positioning unit that is supported by the support column so as to be movable up and down, and that supports the jaw of the subject provided between the X-ray generation unit and the X-ray detection unit; A first camera that is provided on one of the support column and the chin positioning unit and is capable of imaging from the front direction of the subject's chin supported by the chin positioning unit, the X-ray generation unit, and the X A second camera that is provided in any one of the line detectors and that is supported by the jaw positioning unit and capable of photographing from the lateral direction of the jaw of the subject; and is disposed in the vicinity of the jaw positioning unit, Display images taken by one camera and the second camera Capable and a configured monitor, the optical axis of the first camera is directed obliquely upward with respect to the horizontal plane, the subject photographed image of the first camera to be displayed on the monitor unit when the occlusion site is captured in a straight line, the subject of the Frankfort horizontal plane caught on the captured image of the second camera to be displayed on the monitor portion, lies in the Ru parallel to name and the horizontal plane.

  When the subject's head is positioned on the X-ray imaging apparatus so that the Frankfurt plane is parallel to the horizontal plane, the anatomical structure of the subject's jaw is clearly X-rayed in panoramic tomography. The occlusal plane, which is the plane in contact with the upper and lower teeth, has a predetermined angle with respect to the Frankfurt plane, and when the Frankfurt plane is parallel to the horizontal plane, the occlusal plane is inclined downward from the horizontal plane toward the front of the subject. . In this configuration, the camera is arranged so that the optical axis of the first camera is directed obliquely upward with respect to the horizontal plane by the first camera provided on any one of the support column and the jaw positioning unit, The subject's jaw supported by the jaw positioning part can be photographed.

  With this configuration, when the Frankfurt plane is parallel to the horizontal plane, the first camera for frontal imaging of the subject's jaw can easily be positioned on the occlusal plane. In a state where the optical axis of the first camera is in the occlusal plane, the boundary portion where the subject's upper and lower teeth are occluded in the captured image of the first camera is linear. Therefore, by confirming the boundary portion with the captured image of the first camera, it is possible to determine whether or not the subject's chin is in an appropriate posture for X-ray imaging, that is, whether or not the subject's Frankfurt plane is parallel to the horizontal plane. . As a result, the subject's head can be easily positioned.

Another characteristic configuration is that an occlusion line, which is a straight line extending in the horizontal direction, is superimposed and displayed on a captured image of the first camera displayed on the monitor unit.

Another characteristic configuration is the display on the monitor unit when the occlusal part of the subject overlaps the occlusion line superimposed on the captured image of the first camera displayed on the monitor unit. The Frankfurt plane of the subject shown in the image taken by the second camera is parallel to the horizontal plane.

Another characteristic configuration is that the second camera displayed on the monitor unit when the occlusal site of the subject is shown in a straight line in the captured image of the first camera displayed on the monitor unit. The index line of the Frankfurt plane is superimposed on the image so as to be parallel to the horizontal plane.

  In another characteristic configuration, an index line of an occlusal plane having a predetermined angle with respect to the Frankfurt plane is further superimposed and displayed on a captured image of the second camera displayed on the monitor unit, and the index line of the occlusal plane is displayed. Is parallel to the optical axis of the first camera.

  Another characteristic configuration is that the optical axis of the first camera has an inclination angle of 10 to 15 degrees with respect to the horizontal plane.

  The occlusal plane is inclined at an average of 12 degrees with respect to the Frankfurt plane. Therefore, in this configuration, in consideration of individual differences, the camera is arranged such that the optical axis of the camera is inclined at 10 to 15 degrees with respect to the horizontal plane. Thus, by positioning the camera so that the tilt angle of the optical axis of the camera with respect to the horizontal plane is within a narrow range including 12 degrees, the optical axis of the camera is set to the occlusal plane in positioning the head of the subject. It is easy to position it above, and the Frankfurt plane can be easily made parallel to the horizontal plane. Thereby, the subject's head positioning based on the image captured by the camera can be performed with higher accuracy by a simple method.

  The dental X-ray imaging apparatus according to the present invention is characterized in that a swivel arm having an X-ray generation part and an X-ray detection part, an arm support part that supports the swivel arm so as to be turnable, and the arm support part. A support column that is supported so as to be movable up and down, a jaw positioning unit that is supported by the support column so as to be movable up and down, and that supports the jaw of the subject provided between the X-ray generation unit and the X-ray detection unit; A camera provided on one of the support column and the jaw positioning unit and capable of photographing from the front direction of the subject's jaw supported by the jaw positioning unit, the optical axis of the camera being a horizontal plane With respect to the optical axis of the camera, and a position that is lower than the position of the eye of the subject whose jaw is supported by the jaw positioning portion above the horizontal plane in the vertical direction of the horizontal plane. On a virtual parallel line parallel to the optical axis In that it has a line of sight derivatives for inducing visual line of the subject.

  Another characteristic configuration is that the visual line derivative is disposed 60 to 80 mm above the optical axis of the camera in the vertical direction of the horizontal plane.

  The angle of the Frankfurt plane with respect to the horizontal plane changes according to the inclination of the head of the subject whose jaw is placed on the jaw positioning portion. When the Frankfurt plane is parallel to the horizontal plane, the occlusal plane is inclined forward and downward with respect to the horizontal plane. From this, it is understood that when the subject's head is tilted forward, the Frankfurt plane is likely to be parallel to the horizontal plane.

  Therefore, in this configuration, the position is lower than the position of the eye of the subject whose jaw is supported by the jaw positioning portion above the vertical direction of the horizontal plane from the optical axis of the first camera and parallel to the optical axis. A visual line derivative for guiding the visual line of the subject is provided on the virtual parallel line. The optical axis of the first camera is directed obliquely upward with respect to the horizontal plane, and the front of the jaw is photographed by the first camera. Further, in the subject, the distance from the occlusal position of the tooth to the viewpoint position is usually within 60 to 80 mm.

  That is, the gaze derivative is disposed at a position lower than the position of the eye of the subject whose jaw is supported by the jaw positioning unit, and the subject's head directly Becomes leaning forward. Thereby, a test subject can be positioned so that a Frankfurt plane may become parallel to a horizontal plane using a test subject's own operation. As a result, the subject's head can be positioned more easily.

  Another characteristic configuration is that the line-of-sight derivative is disposed on the support column.

  In the dental X-ray imaging apparatus, the support can be provided with a camera that captures the front direction of the subject's jaw supported by the jaw positioning unit, and extends upward from the position of the camera. . That is, there is a space for placing the line-of-sight derivative above the optical axis of the camera in the support column. Therefore, in this configuration, the line-of-sight derivative is disposed on the support column. Thereby, members, such as a bracket for arrange | positioning a gaze derivative, become unnecessary. As a result, the line-of-sight derivative can be easily arranged in the dental X-ray imaging apparatus.

  The characteristic configuration of the head posture adjustment method in the dental X-ray imaging apparatus according to the present invention includes: a swivel arm having an X-ray generation unit and an X-ray detection unit; and an arm support unit that supports the swivel arm in a turnable manner. A support column that supports the arm support unit so as to be able to move up and down; a support unit that is supported by the support column so as to be able to move up and down; and supports a jaw of a subject provided between the X-ray generation unit and the X-ray detection unit A jaw positioning unit, a camera provided in any one of the X-ray generation unit and the X-ray detection unit and capable of photographing from a lateral direction of the subject's jaw supported by the jaw positioning unit; A head posture adjustment method using a dental X-ray imaging apparatus, comprising: a monitor unit arranged in the vicinity of a chin positioning unit and configured to be able to display an image captured by the camera; The gaze derivative to be guided is The jaw is positioned at a position lower than the position of the eye of the subject whose jaw is supported by the jaw positioning unit, and the jaw positioning unit is positioned on the jaw positioning unit while referring to a photographed image of the camera displayed on the monitor unit. It is in the point which adjusts the test subject's head posture to a predetermined forward tilt posture by making the subject who supported the part look directly at the gaze derivative.

  The line-of-sight derivative according to the present invention is characterized in that a swivel arm having an X-ray generation unit and an X-ray detection unit, an arm support unit that supports the swivel arm so as to be swivel, and a support unit that can be moved up and down. A dental X comprising: a supporting column portion; and a jaw positioning portion that is supported by the supporting column portion so as to be movable up and down and supports a jaw portion of a subject provided between the X-ray generation unit and the X-ray detection unit. A line-of-sight derivative arranged in a radiographic apparatus, wherein the head posture of the subject whose jaw is supported by the jaw positioning unit is tilted to a predetermined forward direction when performing X-ray imaging by the dental X-ray apparatus It is used to make a posture, and is arranged at a position lower than the position of the eye of the subject whose jaw is supported by the jaw positioning portion and in the vicinity of the support column, thereby guiding the line of sight of the subject.

It is a perspective view of a dental X-ray imaging apparatus. It is a partial side view of a dental X-ray imaging apparatus. It is a partial front view of a dental X-ray imaging apparatus. It is a plane sectional view showing the photography state by the 1st camera and the 2nd camera. It is a block block diagram of a dental X-ray imaging apparatus. It is a side view which shows the imaging | photography state by a 1st camera. It is a figure which shows an example of the picked-up image of the 1st camera displayed on a monitor part. It is a figure which shows an example of the picked-up image of the 2nd camera displayed on a monitor part. It is a partial side view which shows the X-ray imaging apparatus of another form. It is a figure which shows the gaze derivative of another form. It is a figure which shows the gaze derivative of another form. It is a figure which shows the gaze derivative of another form.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The dental X-ray imaging apparatus A shown in FIGS. 1 to 6 has a panoramic tomography mode and a CT tomography mode. The X-ray imaging apparatus A has a swing arm 10 having an X-ray generation unit 2 and an X-ray detection unit 3, an arm support unit 20 that supports the swing arm 10 so as to be capable of swinging, and an arm support unit 20 that can be moved up and down. And a supporting column 30 to be provided. In the swivel arm 10, the X-ray generation unit 2 and the X-ray detection unit 3 are configured to be arranged to face each other. The support column 30 includes a support column body 31 that is erected on a base 40 that is installed on the floor surface, and a lift body 32 that is attached to the support column body 31 so as to be movable up and down. The arm support unit 20 is attached to the upper part of the lifting body 32 and moves up and down together with the lifting body 32. The elevating body 32 is configured to be movable up and down with respect to the column main body 31 via an elevating mechanism (not shown) such as a motor.

  The swivel arm 10 includes an X-ray generator 2 and an X-ray detector 3. The turning arm 10 is attached to the arm support portion 20 so as to be turnable about the rotation axis P. In the swivel arm 10, the X-ray generation unit 2 and the X-ray detection unit 3 are provided so as to face each other with the rotation axis P therebetween. The X-ray detection unit 3 is configured to be retractable from a position disposed opposite to the X-ray generation unit 2. In the present embodiment, the X-ray detection unit 3 is configured to be movable around the rotation axis P of the revolving arm 10 independently of the position facing the X-ray generation unit 2.

  The X-ray generation unit 2 includes an X-ray generator such as an X-ray tube and a slit or the like that regulates the spread of the X-ray beam, and the X-ray detection unit 3 includes an X-ray such as a CCD sensor that spreads two-dimensionally. It is constituted by a line detector.

  The X-ray imaging apparatus A uses the vertical direction in which the elevating body 32 moves up and down as the Z axis, the X axis orthogonal to the Z axis (for example, the extending direction of the arm support portion 20), and the Y axis (for example, the lateral width of the arm support portion 20). The position of at least the swivel arm 10 is controlled in the two dimensions of the X axis direction and the Y axis direction. The swivel arm 10 is capable of two-dimensional movement in a horizontal plane area by an XY table (not shown) built in the arm support portion 20.

  A jaw positioning unit 50 that supports the jaw of the subject B is provided below the swivel arm 10. As shown in FIGS. 2 and 3, the jaw positioning unit 50 includes a support frame 51 and a main body 52. One end of a support frame 51 is attached to the elevating body 32, and a main body 52 is disposed on the other end of the support frame 51. Thereby, the jaw positioning part 50 is supported by the support | pillar part 30 so that raising / lowering is possible, and the turning arm 10 and the jaw positioning part 50 move up and down integrally with the raising / lowering body 32 moving up and down.

  The main body 52 is provided with a head fixing portion 53 for fixing the head of the subject B, and the support frame 51 is provided with a handle 54 for the subject B to grasp. The head fixing unit 53 includes a chin rest 55 for supporting the subject's B jaw and a pair of side head holders 56 in order to stably fix the head of the subject B during photographing. The temporal head retainers 56 are arranged on the left and right to fix the temporal head. The distance between the pair of side head holders 56 can be adjusted by a dial 57 provided on the side of the chin rest 55. A bite block 58 for opening subject B is provided at the top of the chin rest 55.

  A first camera 33 is attached in the vicinity of the support frame 51 of the jaw positioning unit 50, and a second camera 34 is provided in the X-ray generation unit 2 of the turning arm 10. The first camera 33 and the second camera 34 are provided for photographing a face part including the jaw part of the subject B supported by the jaw positioning part 50. In the present embodiment, the first camera 33 is provided on a camera support 35 attached to the lifting body 32. The support frame 51 extends from the camera support 35. The first camera 33 and the second camera 34 are configured not only as photographic cameras but also as video cameras capable of continuous shooting. The first camera 33 can photograph from the front direction of the jaw part of the subject B supported by the jaw positioning unit 50 and moves up and down together with the jaw positioning unit 50 to obtain an image of the front surface of the subject B jaw. . On the other hand, the second camera 34 acquires an image of the side surface of the jaw of the subject B by moving the X-ray generation unit 2 to the side position of the subject B in the turning arm 10.

  Hereinafter, the relationship between the Frankfurt plane F and the occlusal plane G of the subject B and the first camera 33 will be described with reference to FIG. As shown in FIG. 8, when the subject B is positioned so that the Frankfurt plane F is parallel to the horizontal plane H shown in FIG. 6, the anatomical structure of the jaw of the subject B is obtained in panoramic radiography. It is known that pictures are taken clearly. Here, the horizontal plane H is a plane parallel to the placement surface (for example, the floor surface) of the X-ray imaging apparatus A. The occlusal plane G, which is a plane with which the upper and lower teeth contact, has a predetermined angle with respect to the Frankfurt plane F. When the Frankfurt plane F is parallel to the horizontal plane H, the occlusal plane G moves from the horizontal plane H to the front of the subject B. It will be tilted downward. Therefore, in the present embodiment, as shown in FIG. 6, the first camera 33 is arranged so that the optical axis C of the first camera 33 is directed obliquely upward with respect to the horizontal plane H, and the jaw positioning unit 50 is arranged. The jaw of subject B supported by is photographed.

  Thereby, the optical axis C of the 1st camera 33 can be located on the occlusal plane G (refer FIG. 8). In a state where the optical axis C of the first camera 33 is on the occlusal plane G, the occlusal site where the upper and lower teeth of the subject B are occluded in the photographed image (first image 33a) of the first camera 33 is linear (FIG. 7). reference). An occlusal line D, which is a straight line extending in the horizontal direction, is superimposed on the first image 33a. Accordingly, by confirming that the occlusal site and the occlusal line D overlap with each other in the captured image of the first camera 33, the proper posture for subject X's jaw to perform X-ray imaging, that is, the subject B's Frankfurt It can be determined whether or not the plane F is parallel to the horizontal plane H. As a result, it is possible to easily position the head of the subject B.

  The occlusal plane G is inclined at an average of 12 degrees with respect to the Frankfurt plane F. For this reason, in consideration of individual differences, it is preferable to arrange the first camera 33 so that the optical axis C is inclined upward by 10 to 15 degrees with respect to the horizontal plane H. As described above, in positioning the head of the subject B, the first camera 33 is arranged so that the inclination angle of the optical axis C of the first camera 33 with respect to the horizontal plane H is within a narrow range including 12 degrees. The optical axis C of the first camera 33 can be easily positioned on the occlusal plane G, and the Frankfurt plane F can be easily made parallel to the horizontal plane H. Thereby, the head positioning of the subject B based on the captured image of the first camera 33 can be performed with higher accuracy by a simple method.

  As shown in FIG. 6, the X-ray imaging apparatus A is on a virtual parallel line K that is 60 to 80 mm above the optical axis C of the first camera 33 in the vertical direction of the horizontal plane H and parallel to the optical axis C. It has a gaze derivative 70 for guiding the gaze of the subject B. In the present embodiment, as shown in FIGS. 1 to 3, the subject B is positioned 60-60 mm above the intersection of the first camera 33 and the optical axis C in the lifting body 32 of the support column 30. A visual line derivative 70 for guiding the visual line is arranged. In the subject, the distance from the occlusal position of the tooth to the viewpoint position is usually within 60 to 80 mm. The line-of-sight derivative 70 is disposed at a position lower than the position of the eye of the subject B on which the jaw is placed on the jaw positioning unit 50, and the subject B directly views the line-of-sight derivative 70 according to an operator's instruction or the like. B's head is tilted forward. Accordingly, the subject B can be positioned so that the Frankfurt plane F is parallel to the horizontal plane H by using the motion of the subject B itself. As a result, it is possible to more easily position the head of the subject B. In the present embodiment, the visual line derivative 70 is formed of a circular seal body. The shape of the sealing body is not limited to a circular shape, and may be other shapes such as a triangle and a quadrangle.

  An operation panel 60 (an example of a monitor unit) is attached to the support frame 51 of the jaw positioning unit 50 via a bracket 51a. The operation panel 60 is attached to the support frame 51 so that the posture can be changed. The operation panel 60 is configured to be able to display captured images captured by the first camera 33 and the second camera 34. The operation panel 60 is constituted by, for example, a touch panel, icons for instructing various operations of the X-ray imaging apparatus A are displayed, and the operations are selected by touching the corresponding icons.

  FIG. 5 is a block diagram of the X-ray imaging apparatus A. The X-ray imaging apparatus A is configured to include a control unit 80. The control unit 80 controls the X-ray generation unit 2, the X-ray detection unit 3, the turning arm 10, the lifting body 32, the first camera 33 and the second camera 34, the head fixing unit 53, and the like. The control unit 80 controls display on the operation panel 60 and can execute various controls based on instructions from the operation panel 60. The operation panel 60 is detachable from the support frame 51 and is configured to be able to communicate with the control unit 80 even in the detached state.

  Next, a method for using the X-ray imaging apparatus A will be described. Before guiding the subject B to the X-ray imaging apparatus A, the X-ray generator 2 and the X-ray detector 3 face each other from the state where the X-ray generator 2 and the X-ray detector 3 face each other, as shown in FIG. In contrast, the X-ray detection unit 3 that does not have the second camera 34 is independently moved around the rotation axis P of the turning arm 10. As a result, as indicated by a two-dot chain line in FIG. 4, the X-ray detection unit 3 is on the right side of the subject B in the same manner as the X-ray generation unit 2, and the imaging region 33S of the first camera 33 and the second camera 34 It can be moved to a position that does not overlap any of the imaging regions 34S. After the subject B is guided to the X-ray imaging apparatus A, the X-ray detector 3 may be moved around the rotation axis P of the swivel arm 10 independently of the X-ray generator 2.

  Thus, in the turning arm 10, the rotation of the turning arm 10 independently from the position where the X-ray detection unit 3 that does not have the second camera 34 is opposed to the X-ray generation unit 2 that has the second camera 34. Retreat by moving around the axis P. Since the X-ray detection unit 3 moves around the rotation axis P, the X-ray detection unit 3 can be accommodated in the turning area of the turning arm 10 even after retraction. Accordingly, the X-ray detection unit 3 can be removed from the imaging region 34S of the second camera 34. Further, a space for the operator can be secured at a position facing the second camera 34 across the subject B, so that the operator can adjust the X-ray imaging apparatus A from the side of the subject B and use the operation panel 60. A photographed image can be confirmed. As a result, the surgeon can easily position the head of the subject B.

  Next, the subject B is guided to the jaw positioning unit 50 of the X-ray imaging apparatus A, and the head of the subject B is positioned. At this time, the surgeon can adjust the X-ray imaging apparatus A while directly looking at the side of the face of the subject B by being positioned on the left side of the subject B where the X-ray detection unit 3 does not exist. The surgeon adjusts the height of the chin rest 55 so that the jaw of the subject B is placed on the chin rest 55 and causes the subject B to bite the bite block 58. In this state, the surgeon instructs the subject B to look at the gaze derivative 70.

  The surgeon displays the front image of the subject B displayed on the operation panel 60 (first image 33a photographed by the first camera 33) and the side image of the subject B (second image 34a photographed by the second camera 34). ) And finely adjust the height of the chin rest 55.

An example of the first image 33a displayed on the operation panel 60 is shown in FIG. 7, and an example of the second image 34a is shown in FIG. As shown in FIG. 7, when the occlusal site where the upper and lower teeth of the subject B are occluded overlaps with the occlusion line D in the first image 33 a and appears in a straight line, It can be determined that the proper posture, that is, the Frankfurt plane F of the subject B is parallel to the horizontal plane H shown in FIG. On the other hand, as shown in FIG. 8, the second image 34a, which is a side image, is configured such that the index line of the Frankfurt plane F and the index line of the occlusal plane G are superimposed. If the occlusal site is shown in a straight line, the index line of the Frankfurt plane F passing near the ear of the subject B is superimposed and displayed so as to be parallel to the horizontal plane H. The index line of the occlusal plane G inclined forward and downward of the subject B is displayed in a superimposed manner.
By referring to the occlusion line D and the index lines of the Frankfurt plane F and the occlusion plane G in the first image 33a and the second image 34a, the operator can easily position the head of the subject B.

  Based on the first image 33a and the second image 34a and the direct view of the subject B, the temporal position of the subject B is fixed after confirming that the position and posture of the jaw of the subject B are appropriate.

  When the positioning of the head of the subject B is completed, camera scout designation for X-ray imaging is performed using the first camera 33 and the second camera 34. As shown in FIG. 7, the first image 33a is configured to be able to display a rectangular index line E for designating an imaging region. The size and shape of the area specified by the index line E can be changed as appropriate. As shown in FIG. 8, the second image 34a is configured to be able to display the same index line J as that of the first image 33a.

  In the case of panoramic tomography, the median position is designated by the index line E of the first image 33a shown in FIG. 7, and the canine position is designated by the index line J of the second image 34a shown in FIG. In the case of CT tomography, the imaging region in the left-right direction of the face is designated by the index line E of the first image 33a shown in FIG. 7, and the face of the face is designated by the index line J of the second image 34a shown in FIG. Specify the shooting area in the front-rear direction. When the control unit 80 receives designation of an imaging region from the operation panel 60, the control unit 80 transmits a control signal to the X-ray generation unit 2, the X-ray detection unit 3, and the turning arm 10. As a result, the X-ray generation unit 2 and the X-ray detection unit 3 move to a position where the designated imaging region can be imaged, and the X-ray irradiation region is adjusted in the X-ray generation unit 2, so that the X-ray detection unit 3, the X-ray detection area is adjusted. Thereafter, panoramic tomography or CT tomography is started.

[Another embodiment]
(1) In the above-described embodiment, the configuration in which the first camera 33 is provided on the camera support 35 attached to the elevating body 32 of the support column 30 is shown. However, as shown in FIG. You may attach to the stay 52a extended from the main-body part 52 of the positioning part 50. FIG. Although not shown, the first camera 33 may be attached to the support frame 51 of the jaw positioning unit 50 via a bracket 51a or the like.

(2) In the above embodiment, the chin positioning unit 50 has the chin rest 55 and the bite block 58 provided on the chin rest 55. However, as shown in FIG. A configuration in which the byte block 58 is extended from the main body 52 or the like without having it is also possible.

(3) In the above-described embodiment, the example in which the second camera 34 is provided in the X-ray generation unit 2 of the turning arm 10 has been described, but the second camera 34 may be provided in the X-ray detection unit 3.

(4) Among the X-ray generation unit 2 and the X-ray detection unit 3, the configuration in which one without the second camera 34 can be retracted from the position opposite to the other with the second camera 34 is the above configuration It is not limited to the embodiment. For example, one (X-ray generation unit 2 or X-ray detection unit 3) that does not have the second camera 34 may be configured to be detachable from the revolving arm 10. By removing one (the X-ray generation unit 2 or the X-ray detection unit 3) that does not have the second camera 34 from the turning arm 10, the other that does not have the second camera 34 can be retracted from the oppositely arranged position. During X-ray imaging, one (X-ray generation unit 2 or X-ray detection unit 3) that does not have the second camera 34 is attached to the turning arm 10 again. In addition, one (X-ray generation unit 2 or X-ray detection unit 3) that does not have the second camera 34 may be configured to be movable toward the upper side of the turning arm 10.

(5) In the above-described embodiment, an example in which the line-of-sight derivative 70 is disposed on the lifting body 32 of the support column 30 has been described, but the line-of-sight derivative 70 is perpendicular to the horizontal plane H from the optical axis C of the first camera 33. As long as it exists on a virtual parallel line K parallel to the optical axis C, and may be disposed on another member. For example, a member (not shown) for disposing the line-of-sight derivative 70 is attached to the jaw positioning unit 50 (the support frame 51, the main body 52, the chin rest 55, etc.) upward, or the member (not shown) is below the arm support 20 You may attach toward.

(6) A plurality of line-of-sight derivatives 70 may be provided in the vertical direction of the lifting body 32. FIG. 10 shows an example in which the line-of-sight derivative 71 is constituted by three seal bodies 71a, 71b, 71c. For example, the plurality of seal bodies 71a to 71c may include separate cover bodies 75a to 75c, and may be configured to be switchable between a display state and a non-display state. As shown in FIG. 11, the position of the line-of-sight derivative 72 may be changeable in the vertical direction of the lifting body 32. As shown in FIG. 12, the line-of-sight derivative 73 may include a plurality of light emitters 73a, 73b, and 73c, and any one light emitter (for example, 73b) may be turned on.

  The present invention can be widely used for X-ray imaging apparatuses for the head.

2: X-ray generation unit 3: X-ray detection unit 10: Revolving arm 20: Arm support unit 30: Supporting unit 32: Lifting body 33: First camera 33a: First image 34: Second camera 34a: Second image 35 : Camera support 40: Base 50: Jaw positioning part 51: Support frame 53: Head fixing part 55: Chin rest 60: Operation panel (monitor part)
70, 71, 72, 73: Gaze derivative 80: Control unit A: X-ray imaging apparatus B: Subject C: Optical axis F: Index line (Frankfurt plane)
G: Index line (occlusion plane)
K: Virtual parallel line P: Rotation axis

Claims (4)

A swivel arm having an X-ray generator and an X-ray detector;
An arm support portion for pivotally supporting the swivel arm;
A support column that supports the arm support so as to be movable up and down;
A jaw positioning unit that is supported by the support column so as to be movable up and down, and that supports a jaw of a subject provided between the X-ray generation unit and the X-ray detection unit;
A camera that is provided on any one of the support column and the chin positioning unit, and capable of photographing from the front direction of the subject's chin supported by the chin positioning unit;
A dental X-ray imaging apparatus in which an optical axis of the camera is directed obliquely upward with respect to a horizontal plane.   The dental X-ray imaging apparatus according to claim 1, wherein the optical axis of the camera has an inclination angle of 10 to 15 degrees with respect to the horizontal plane.   3. The gaze derivative for guiding the gaze of the subject on a virtual parallel line that is 60 to 80 mm above the horizontal plane in the vertical direction of the camera and parallel to the optical axis. Dental X-ray equipment.   The dental X-ray imaging apparatus according to claim 3, wherein the line-of-sight derivative is disposed on the support column.

Images