JP6947429B2 - Dental X-ray equipment and line-of-sight derivatives - Google Patents

Description

The present invention relates to a dental radiographing apparatus and a line-of-sight derivative in which a subject's head is positioned.

In radiography in dentistry, the operator guides the subject to the X-ray apparatus and then positions the subject's head. Specifically, the operator positions the head of the subject by adjusting the device while instructing the subject.

Generally, in panoramic radiography, the subject's head is positioned so that the Frankfurt plane is parallel to the horizontal plane (eg, the floor). The Frankfurt plane is a virtual plane connecting the lowest points of the left and right orbits, which are the anterior reference points, and the upper ends of both external ear canals, which are the posterior reference points. It is known that the anatomical structure of the subject's jaw is clearly radiographed in panoramic radiography because the occlusal plane tilts forward at an appropriate angle when the Frankfurt plane is parallel to the horizontal plane. Patent Document 1 discloses an X-ray imaging apparatus including a beam generator. In this X-ray 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.

Japanese Unexamined Patent Publication No. 2013-244145

However, in the X-ray imaging apparatus shown in Patent Document 1, it is not easy for the operator to adjust the apparatus while instructing the subject to make the Frankfurt plane follow the horizontal beam. In addition, it is difficult for the subject to recognize the Frankfurt plane, and the subject may find the horizontal beam near the field of view unpleasant.

In view of the above circumstances, there is a demand for a dental X-ray imaging apparatus capable of easily positioning the subject's head.

The characteristic configuration of the dental X-ray imaging apparatus according to the present invention is that a swivel arm having an X-ray generating portion and an X-ray detecting portion, an arm support portion that rotatably supports the swivel arm, and the arm support portion are provided. A strut portion that supports ascending and descending, a jaw positioning portion that is supported by the strut portion and supports the jaw portion of a subject provided between the X-ray generating portion and the X-ray detecting portion, and the jaw positioning portion. A first camera provided on either the strut portion or the jaw positioning portion and supported by the jaw positioning portion and capable of photographing the subject's jaw portion from the front direction, the X-ray generating portion and the X A second camera provided on either one of the line detection portions and supported by the jaw positioning portion and capable of photographing from the side surface direction of the jaw portion of the subject, and a second camera arranged in the vicinity of the jaw positioning portion and described above. A monitor unit configured to be able to display images taken by one camera and the second camera is provided, and the optical axis of the first camera is directed diagonally upward with respect to a horizontal plane and displayed on the monitor unit. When the occlusal portion of the subject is shown in a straight line in the image taken by the first camera, the Frankfurt plane of the subject shown in the image taken by the second camera displayed on the monitor unit is the horizontal plane. It is at a point parallel to.

When the subject's head is positioned on the radiographer so that the Frankfurt plane is parallel to the horizontal plane, the anatomy of the subject's jaw is clearly radiographed, especially in panoramic radiography. The occlusal plane, which is the plane where the upper and lower teeth meet, has a predetermined angle with respect to the Frankfurt plane, and when the Frankfurt plane becomes parallel to the horizontal plane, the occlusal plane is inclined forward and downward from the horizontal plane. .. In this configuration, the cameras are arranged so that the optical axis of the first camera is directed diagonally upward with respect to the horizontal plane by the first camera provided on either the support column portion or the jaw positioning portion. The jaw of the subject supported by the jaw positioning portion 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 position its optical axis on the occlusal plane. When the optical axis of the first camera is on the occlusal plane, the boundary portion where the upper and lower teeth of the subject occlude in the image captured by the first camera becomes a straight line. Therefore, by confirming the boundary portion in the image taken by the first 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 head of the subject can be easily positioned.

Another feature configuration is that the occlusal line, which is a straight line extending in the lateral direction, is superimposed and displayed on the captured image of the first camera displayed on the monitor unit.

Another feature configuration is displayed on the monitor unit when the occlusal portion of the subject is superimposed on the occlusal line displayed superimposed on the image captured by the first camera displayed on the monitor unit. The Frankfurt plane of the subject in the image taken by the second camera is at a point parallel to the horizontal plane.

Another feature configuration is the imaging of the second camera displayed on the monitor unit when the occlusal portion of the subject is linearly reflected in the image captured by the first camera displayed on the monitor unit. The point is that the index line of the Frankfurt plane is superimposed and displayed on the image so as to be parallel to the horizontal plane.

Another feature configuration is that the index line of the occlusal plane having a predetermined angle with respect to the Frankfurt plane is further superimposed and displayed on the captured image of the second camera displayed on the monitor unit, and the index line of the occlusal plane is displayed. Is at a point 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 12 degrees on average with respect to the Frankfurt plane. Therefore, in this configuration, the cameras are arranged so that the optical axis of the camera is tilted at 10 to 15 degrees with respect to the horizontal plane in consideration of individual differences. In this way, by arranging 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 placed on the occlusal plane when the subject's head is positioned. It is easy to position it on the top, and the Frankfurt plane can be easily parallel to the horizontal plane. As a result, the head position of the subject based on the image captured by the camera can be more accurately positioned by a simple method.

The characteristic configuration of the dental X-ray imaging apparatus according to the present invention is that a swivel arm having an X-ray generator and an X-ray detector, an arm support portion that rotatably supports the swivel arm, and the arm support portion are provided. A strut portion that supports ascending and descending, a jaw positioning portion that is supported by the strut portion and supports the jaw portion of a subject provided between the X-ray generating portion and the X-ray detecting portion, and the jaw positioning portion. A camera provided on either the support column portion or the jaw positioning portion and supported by the jaw positioning portion and capable of photographing the subject's jaw portion from the front direction is provided, and the optical axis of the camera is a horizontal plane. At a position lower than the position of the subject's eye in which the jaw portion is supported by the jaw positioning portion in the vertical direction of the horizontal plane intersecting the optical axis of the camera. The point is that it has a line-of-sight derivative for guiding the line-of-sight of the subject.

Another characteristic configuration is that the line-of-sight derivative is arranged on a virtual parallel line parallel to the optical axis of the camera from the position of the eye of the subject whose jaw is supported by the jaw positioning portion.

Another feature configuration is that it further includes a monitor unit that can display an image captured by the camera.

Another feature configuration is that the occlusal line extending in the lateral direction is superimposed and displayed on the captured image of the camera displayed on the monitor unit.

Another characteristic configuration is that the line-of-sight derivative is arranged 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 changes with respect to the horizontal plane 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 tilts forward and downward with respect to the horizontal plane. From this, it is understood that the Frankfurt plane tends to be parallel to the horizontal plane when the subject's head is tilted forward.

Therefore, in this configuration, the line of sight for guiding the subject's line of sight to a position above the vertical direction of the horizontal plane intersecting the optical axis of the camera and lower than the position of the subject's eye in which the chin is supported by the chin positioning part. Has a derivative. The optical axis of the camera is directed diagonally upward with respect to the horizontal plane, and the camera captures the front of the jaw. In addition, the distance from the occlusal position of the tooth to the viewpoint position in the subject is usually within the range of 60 to 80 mm.

That is, the line-of-sight derivative is placed at a position lower than the position of the subject's eye whose chin is supported by the chin positioning part, and the subject directly looks at the line-of-sight derivative according to the operator's instruction or the like, so that the subject's head is raised. Become a forward leaning posture. As a result, the subject can be positioned so that the Frankfurt plane is parallel to the horizontal plane by using the subject's own movement. As a result, the head position of the subject can be more easily performed.

Another characteristic configuration is that the line-of-sight derivative is arranged on the strut portion.

In the dental X-ray imaging apparatus, the strut portion can be provided with a camera for photographing the front direction of the jaw portion of the subject supported by the jaw positioning portion, and extends upward from the position of the camera. .. That is, there is a space in the support column for arranging the line-of-sight derivative above the optical axis of the camera. Therefore, in this configuration, the line-of-sight derivative is arranged on the support column. This eliminates the need for members such as brackets for arranging the line-of-sight derivative. 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 adjusting method in the dental X-ray imaging apparatus according to the present invention is a swivel arm having an X-ray generating portion and an X-ray detecting portion, and an arm support portion that rotatably supports the swivel arm. Supports a strut portion that supports the arm support portion so as to be able to move up and down, and a jaw portion of a subject that is supportably supported by the strut portion and is provided between the X-ray generating portion and the X-ray detecting portion. A camera provided in either the jaw positioning portion, the X-ray generating portion or the X-ray detecting portion, and supported by the jaw positioning portion, capable of photographing from the side surface of the subject's jaw portion, and the above. A head posture adjustment method using a dental X-ray imaging device provided with a monitor unit arranged in the vicinity of the jaw positioning unit and capable of displaying an image captured by the camera, in which the subject's line of sight is viewed. The line-of-sight derivative to be guided is arranged near the strut portion and at a position lower than the position of the eye of the subject whose jaw portion is supported by the jaw positioning portion, and the photographed image of the camera displayed on the monitor portion is displayed. The point is that the head posture of the subject is adjusted to a predetermined forward leaning posture by having the subject whose jaw portion is supported by the jaw positioning portion directly look at the line-of-sight derivative while referring to the reference.

The characteristic configuration of the line-of-sight derivative according to the present invention is a swivel arm having an X-ray generating portion and an X-ray detecting portion, an arm support portion that rotatably supports the swivel arm, and an arm support portion that supports the arm support portion so as to be able to move up and down. Dental X provided with a strut portion to be lifted and a jaw positioning portion that is supported by the strut portion so as to be able to move up and down and supports a subject's jaw portion provided between the X-ray generating portion and the X-ray detecting portion. A line-of-sight derivative arranged in a radiographing apparatus, which tilts the head posture of the subject whose jaw is supported by the jaw positioning portion in a predetermined forward tilt during X-ray imaging by the dental X-ray imaging apparatus. It is used for posture and is arranged at a position lower than the position of the subject's eyes in which the jaw portion is supported by the jaw positioning portion and in the vicinity of the support column portion to guide the subject's line of sight.

It is a perspective view of the dental X-ray imaging apparatus. It is a partial side view of the dental X-ray imaging apparatus. It is a partial front view of the dental X-ray imaging apparatus. It is a plan sectional view which shows the photographing state by a 1st camera and a 2nd camera. It is a block block diagram of the dental X-ray imaging apparatus. It is a side view which shows the photographing state by a 1st camera. It is a figure which shows an example of the image taken by the 1st camera displayed on the monitor part. It is a figure which shows an example of the image taken by the 2nd camera displayed on the monitor part. It is a partial side view which shows the X-ray photographing apparatus of another form. It is a figure which shows the line-of-sight derivative of another form. It is a figure which shows the line-of-sight derivative of another form. It is a figure which shows the line-of-sight 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 supports a swivel arm 10 having an X-ray generating unit 2 and an X-ray detecting unit 3, an arm support portion 20 that supports the swivel arm 10 so as to be swivel, and an arm support portion 20 that can be raised and lowered. The support column portion 30 is provided. In the swivel arm 10, the X-ray generating unit 2 and the X-ray detecting unit 3 can be arranged so as to face each other. The support column portion 30 has a support column main body 31 that is erected on a base 40 installed on the floor surface, and an elevating body 32 that is vertically attached to the support column main body 31. The arm support portion 20 is attached to the upper part of the elevating body 32 and moves up and down together with the elevating body 32. The elevating body 32 is configured to be able to move up and down with respect to the support column main body 31 via an elevating mechanism (not shown) such as a motor.

The swivel arm 10 includes an X-ray generating unit 2 and an X-ray detecting unit 3. The swivel arm 10 is rotatably attached to the arm support portion 20 about the rotation shaft P. In the swivel arm 10, the X-ray generating unit 2 and the X-ray detecting unit 3 are provided so as to be arranged so as to face each other with the rotation axis P interposed therebetween. The X-ray detection unit 3 is configured to be able to evacuate from a position arranged 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 swivel arm 10 independently of the position arranged so as to face the X-ray generation unit 2.

The X-ray generator 2 is composed of 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 detector 3 is an X-ray sensor or the like that spreads two-dimensionally. It consists of a line detector.

In the X-ray imaging apparatus A, the vertical direction in which the elevating body 32 moves up and down is defined as the Z axis, and the X axis (for example, the extending direction of the arm support portion 20) and the Y axis (for example, the width of the arm support portion 20) orthogonal to the Z axis are defined as the Z axis. The position of the swivel arm 10 is controlled at least in two dimensions in the X-axis direction and the Y-axis direction in the three-dimensional axial direction consisting of (direction). The swivel arm 10 can be moved two-dimensionally in a horizontal plane region by an XY table (not shown) built in the arm support portion 20.

Below the swivel arm 10, a jaw positioning portion 50 that supports the jaw portion of the subject B is provided. As shown in FIGS. 2 and 3, the jaw positioning portion 50 includes a support frame 51 and a main body portion 52. One end of the support frame 51 is attached to the elevating body 32, and the main body 52 is arranged at the other end of the support frame 51. As a result, the jaw positioning portion 50 is supported by the support column portion 30 so as to be able to move up and down, and the swivel arm 10 and the jaw positioning portion 50 move up and down integrally with the vertical movement of the elevating body 32.

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 grip. The head fixing portion 53 has a chin rest 55 for supporting the chin of the subject B and a pair of temporal retainers 56 in order to stably fix the head of the subject B at the time of photographing. The temporal retainer 56 is arranged on the left and right to fix the temporal region. The distance between the pair of temporal retainers 56 can be adjusted by a dial 57 provided on the side of the chin rest 55. A bite block 58 for opening the subject B is provided above the chin rest 55.

A first camera 33 is attached in the vicinity of the support frame 51 of the jaw positioning portion 50, and a second camera 34 is provided in the X-ray generating portion 2 of the swivel arm 10. The first camera 33 and the second camera 34 are provided for photographing the face portion including the chin portion of the subject B supported by the chin positioning portion 50. In the present embodiment, the first camera 33 is provided on the camera support 35 attached to the elevating body 32. The support frame 51 extends from the camera support 35. The first camera 33 and the second camera 34 are configured to function not only as a photographic camera but also as a video camera capable of continuously shooting. The first camera 33 can take an image from the front direction of the jaw portion of the subject B supported by the jaw positioning portion 50, and moves up and down together with the jaw positioning portion 50 to acquire an image of the front surface of the jaw portion of the subject B. .. 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 generating portion 2 to the lateral position of the subject B on the swivel arm 10.

Hereinafter, the relationship between the subject B's Frankfurt plane F and the occlusal plane G and the first camera 33 will be described with reference to FIG. As shown in FIG. 8, when the head of 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 to be clearly photographed. Here, the horizontal plane H is a plane parallel to the mounting surface (for example, the floor surface) of the X-ray imaging apparatus A. The occlusal plane G, which is the plane where the upper and lower teeth meet, has a predetermined angle with respect to the Frankfurt plane F, and when the Frankfurt plane F is parallel to the horizontal plane H, the occlusal plane G is in front of the subject B from the horizontal plane H. 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 diagonally upward with respect to the horizontal plane H, and the jaw positioning portion 50 The jaw of subject B supported by the camera is photographed.

As a result, the optical axis C of the first camera 33 can be positioned on the occlusal plane G (see FIG. 8). When the optical axis C of the first camera 33 is on the occlusal plane G, the occlusal portion where the upper and lower teeth of the subject B occlude in the image taken by the first camera 33 (first image 33a) becomes linear (FIG. 7). reference). An occlusal line D, which is a straight line extending in the lateral direction, is superimposed and displayed on the first image 33a. Therefore, by confirming that the occlusal portion and the occlusal line D overlap with each other in the image taken by the first camera 33, the jaw portion of the subject B is in an appropriate posture for X-ray photography, 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, the head of the subject B can be easily positioned.

The occlusal plane G is inclined by an average of 12 degrees with respect to the Frankfurt plane F. Therefore, in consideration of individual differences, it is preferable to arrange the first camera 33 so that the optical axis C is tilted upward by 10 to 15 degrees with respect to the horizontal plane H. In this way, by arranging the first camera 33 so that the tilt 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 head position of the subject B can be determined. , 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 position of the subject B based on the image captured by the first camera 33 can be more accurately performed by a simple method.

As shown in FIG. 6, the X-ray imaging apparatus A is located 60 to 80 mm above the optical axis C of the first camera 33 in the vertical direction of the horizontal plane H and on a virtual parallel line K parallel to the optical axis C. It has a line-of-sight derivative 70 for guiding the line of sight of subject B. In the present embodiment, as shown in FIGS. 1 to 3, the subject B is located 60 to 80 mm above the intersection of the first camera 33 with the optical axis C in the elevating body 32 of the support column 30. A line-of-sight derivative 70 for guiding the line of sight of the above is arranged. In the subject, the distance from the occlusal position of the tooth to the viewpoint position usually falls within the range of 60 to 80 mm. The line-of-sight derivative 70 is arranged at a position lower than the eye position of the subject B on which the jaw portion is placed on the jaw positioning portion 50, and the subject B directly looks at the line-of-sight derivative 70 according to the operator's instruction or the like. B's head is in a forward leaning posture. As a result, the subject B can be positioned so that the Frankfurt plane F is parallel to the horizontal plane H by utilizing the movement of the subject B itself. As a result, the head position of the subject B can be more easily performed. In the present embodiment, the line-of-sight derivative 70 is composed of a circular seal body. The shape of the seal body is not specified as a circular shape and may be another shape such as a triangle or 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 its posture can be changed. The operation panel 60 is configured to be capable of displaying captured images captured by the first camera 33 and the second camera 34. The operation panel 60 is composed of, for example, a touch panel, and 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 includes a control unit 80. The control unit 80 controls the X-ray generation unit 2, the X-ray detection unit 3, the swivel arm 10, the elevating body 32, the first camera 33 and the second camera 34, the head fixing unit 53, and the like. The control unit 80 can control the display on the operation panel 60 and execute various controls based on the instructions from the operation panel 60. The operation panel 60 is removable from the support frame 51, and is configured to be able to communicate with the control unit 80 even when the operation panel 60 is removed.

Next, how to use the X-ray imaging apparatus A will be described. Before guiding the subject B to the X-ray photographing apparatus A, as shown in FIG. 4, the X-ray generating unit 2 and the X-ray detecting unit 3 face each other to the X-ray generating unit 2 having the second camera 34. On the other hand, the X-ray detection unit 3 having no second camera 34 is independently moved around the rotation axis P of the swivel arm 10. As a result, as shown by the alternate long and short dash line in FIG. 4, the X-ray detection unit 3 is on the right side of the subject B like the X-ray generation unit 2, and the imaging area 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 shooting areas 34S. After guiding the subject B to the X-ray imaging apparatus A, the X-ray detection unit 3 may be independently moved around the rotation axis P of the swivel arm 10 with respect to the X-ray generation unit 2.

In this way, in the swivel arm 10, the swivel arm 10 rotates independently of the position where the X-ray detection unit 3 having no second camera 34 faces the X-ray generator 2 having the second camera 34. It retracts by moving around the axis P. Since the X-ray detection unit 3 moves around the rotation axis P, it can be housed in the swivel region of the swivel arm 10 even after being retracted. As a result, the X-ray detection unit 3 can be removed from the shooting area 34S of the second camera 34. In addition, a space for the operator can be secured at a position facing the second camera 34 with the subject B in between, and the operator can adjust the X-ray imaging device A from the side of the subject B and use the operation panel 60. It is possible to check the captured image and the like. As a result, the operator can easily position the head of the subject B.

Next, the subject B is guided to the jaw positioning portion 50 of the X-ray imaging apparatus A to position the subject B's head. At this time, since the operator is located on the left side of the subject B in which the X-ray detection unit 3 does not exist, the operator can adjust the X-ray imaging device A while directly looking at the side surface of the face of the subject B. 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 operator instructs subject B to look at the line-of-sight derivative 70.

The surgeon has a front image of the subject B (first image 33a taken by the first camera 33) and a side image of the subject B (second image 34a taken by the second camera 34) displayed on the operation panel 60. ), Fine-tune 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, in the first image 33a, when the occlusal portion where the upper and lower teeth of the subject B occlude overlaps with the occlusal line D and is photographed in a straight line, the jaw portion of the subject B is photographed by X-ray. 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 so that the index line of the Frankfurt plane F and the index line of the occlusal plane G are superimposed. If the occlusal part 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 part of the subject B is used as a reference. The index line of the occlusal plane G that is inclined forward and downward of the subject B is superimposed and displayed on the subject B.
The surgeon can easily position the head of the subject B by referring to the occlusal line D and the index lines of the Frankfurt plane F and the occlusal 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 region 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, the first camera 33 and the second camera 34 are used to designate a camera scout for X-ray photography. As shown in FIG. 7, the first image 33a is configured so that a rectangular index line E for designating a photographing area can be displayed. The size and shape of the region specified by the index line E can be changed as appropriate. As shown in FIG. 8, the second image 34a is also configured so that the same index line J as the first image 33a can be displayed.

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 area 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 index line J of the second image 34a shown in FIG. 8 is the index line J of the face. Specify the shooting area in the front-back direction. When the control unit 80 receives the designation of the photographing area 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 swivel 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 area can be photographed, and the X-ray irradiation area is adjusted in the X-ray generation unit 2 to adjust the X-ray irradiation area. In 3, the X-ray detection area is adjusted. After that, panoramic tomography or CT tomography is started.

[Another Embodiment]
(1) In the above 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, but as shown in FIG. 9, the first camera 33 has a jaw. It may be attached to the stay 52a extending from the main body 52 of the positioning portion 50. Although not shown, the first camera 33 may be attached to the support frame 51 of the jaw positioning portion 50 via a bracket 51a or the like.

(2) In the above embodiment, the jaw positioning portion 50 has a chin rest 55 and a bite block 58 provided on the chin rest 55. However, as shown in FIG. 9, the jaw positioning portion 50 has the chin rest 55. The bite block 58 may be extended from the main body 52 or the like without the presence.

(3) In the above embodiment, the second camera 34 is provided in the X-ray generating unit 2 of the swivel arm 10, but the second camera 34 may be provided in the X-ray detecting unit 3.

(4) Of the X-ray generation unit 2 and the X-ray detection unit 3, one of the X-ray generation units 2 and the X-ray detection unit 3 that does not have the second camera 34 can be retracted from a position facing the other that has the second camera 34. It is not limited to the embodiment. For example, one that does not have the second camera 34 (X-ray generation unit 2 or X-ray detection unit 3) may be detachably configured with respect to the swivel arm 10. By removing the one that does not have the second camera 34 (X-ray generation unit 2 or the X-ray detection unit 3) from the swivel arm 10, the other that does not have the second camera 34 can be retracted from the oppositely arranged positions. At the time of X-ray photography, one that does not have the second camera 34 (X-ray generation unit 2 or X-ray detection unit 3) is reattached to the swivel arm 10. In addition, one side (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 swivel arm 10.

(5) In the above embodiment, the line-of-sight derivative 70 is arranged on the elevating body 32 of the support column 30, but the line-of-sight derivative 70 is in the vertical direction of the horizontal plane H from the optical axis C of the first camera 33. It suffices if it exists on a virtual parallel line K that is 60 to 80 mm above and parallel to the optical axis C, and may be arranged on another member. For example, a member (not shown) on which the line-of-sight derivative 70 is arranged may be attached upward to the jaw positioning portion 50 (support frame 51, main body 52, chin rest 55, etc.), or downward with respect to the arm support portion 20. It may be mounted toward.

(6) A plurality of line-of-sight derivatives 70 may be provided in the vertical direction of the elevating body 32. FIG. 10 shows an example in which the line-of-sight derivative 71 is composed of three seal bodies 71a, 71b, and 71c. The plurality of seal bodies 71a to 71c may be provided with cover bodies 75a to 75c separately, and may be configured to be switchable between a display state and a non-display state. As shown in FIG. 11, the line-of-sight derivative 72 may be repositionable in the vertical direction of the elevating body 32. Further, as shown in FIG. 12, the line-of-sight derivative 73 is composed of a plurality of light emitting bodies 73a, 73b, 73c, and any one of the light emitting bodies (for example, 73b) may be turned on.

The present invention can be widely used in an X-ray imaging apparatus for the head.

2: X-ray generator 3: X-ray detector 10: Swivel arm 20: Arm support 30: Strut 32: Elevator 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: Line-of-sight derivative 80: Control unit A: X-ray imaging device B: Subject C: Optical axis F: Index line (Frankfurt plane)
G: Index line (occlusal plane)
K: Virtual parallel line P: Rotation axis

Claims (7)

A swivel arm having an X-ray generator and an X-ray detector,
An arm support portion that supports the swivel arm so that it can swivel,
A strut that supports the arm support so that it can be raised and lowered,
A jaw positioning portion that is supported by the strut portion so as to be able to move up and down and supports the jaw portion of the subject provided between the X-ray generating portion and the X-ray detecting portion.
A camera provided on either one of the strut portion and the jaw positioning portion and supported by the jaw positioning portion and capable of photographing the subject's jaw portion from the front direction is provided.
The optical axis of the camera is directed diagonally upward with respect to the horizontal plane.
A line-of-sight derivative for guiding the subject's line of sight is provided in the vertical direction of the horizontal plane intersecting the optical axis of the camera and at a position lower than the position of the subject's eye in which the jaw portion is supported by the jaw positioning portion. Dental X-ray equipment. The dental X-ray imaging apparatus according to claim 1, wherein the line-of-sight derivative is arranged on a virtual parallel line parallel to the optical axis of the camera from the position of the subject's eye whose jaw portion is supported by the jaw positioning portion. .. The dental X-ray imaging apparatus according to claim 1 or 2, further comprising a monitor unit capable of displaying an image captured by the camera. The dental X-ray imaging apparatus according to claim 3, wherein an occlusal line extending in the lateral direction is superimposed and displayed on an image captured by the camera displayed on the monitor unit. The dental X-ray imaging apparatus according to any one of claims 1 to 4, wherein the line-of-sight derivative is arranged 60 to 80 mm above the optical axis of the camera in the vertical direction of the horizontal plane. The dental X-ray imaging apparatus according to any one of claims 1 to 5, wherein the line-of-sight derivative is arranged on the support column. A swivel arm having an X-ray generating portion and an X-ray detecting portion, an arm support portion that supports the swivel arm so as to be swivel, a strut portion that supports the arm support portion so as to be elevated, and a strut portion that can be raised and lowered to the strut portion. It is a line-of-sight derivative arranged in a dental X-ray imaging apparatus including a jaw positioning portion that supports the subject's jaw portion and is provided between the X-ray generating portion and the X-ray detecting portion. hand,
It is used to make the head posture of the subject whose jaw is supported by the jaw positioning portion into a predetermined forward leaning posture during X-ray imaging by the dental X-ray imaging apparatus.
A line-of-sight derivative that is arranged near the strut portion and at a position lower than the position of the subject's eye in which the jaw portion is supported by the jaw positioning portion to guide the subject's line of sight.

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