JP2820987B2 - Dental X-ray equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental X-ray imaging apparatus used for X-ray diagnosis in dental care, and in particular, an apparatus having only one set of an X-ray tube and an image apparatus. In addition to panoramic tomography of all teeth and jaw bones, dental X-rays perform imaging of the jaw joints, maxillary sinuses, cervical vertebrae, etc. while the X-ray tube and imaging device are stationary.
The present invention relates to a radiographic apparatus.

[Conventional technology]

Dental panoramic tomography X-rays are indispensable for X-ray diagnosis in the dental and oral region today, because it is possible to examine the presence or absence of lesions and the lesion site by observing the entire tomographic image of the whole tooth or jawbone, etc. It is one of the diagnostic methods that can not be done.
However, due to the nature of tomography, panoramic tomography,
Since an image is obtained by superimposing an image of a blur, an obstruction shadow, a cervical vertebra, or the like, a complete diagnosis may be difficult only with the amount of diagnostic information obtained only from a panoramic tomographic image.

Therefore, in order to obtain highly reliable and detailed information on diseases of the oral region, in addition to panoramic tomography, normal X-ray imaging performed while the X-ray tube and the imaging device are stationary is used. (In this specification, this is called “simple shooting”). Particularly in recent years, the number of patients with temporomandibular disorders tends to increase, and simple imaging of the temporomandibular joint and the like is becoming indispensable in X-ray diagnosis of the oral region. Therefore, in order to perform an X-ray diagnosis of the oral cavity region accurately, it is necessary to provide two devices, that is, a panoramic tomography device and a simple imaging device.

In addition, as one device that can perform simple imaging of the oral cavity region together with panoramic tomography X-ray imaging, for example, as disclosed in Japanese Patent Application Laid-Open No. Head standard X with tomography
2. Description of the Related Art A so-called panoramic cephalo X-ray imaging apparatus capable of simultaneously performing X-ray imaging is generally known. In addition, recently, some of them have been developed that can perform simple imaging of a temporomandibular joint or the like using a single device together with panoramic tomography.

[Problems to be solved by the invention]

However, installing two apparatuses, a panoramic tomography apparatus and a simple imaging apparatus, has problems in terms of equipment cost and installation space. In particular, for example, when loading a dental X-ray apparatus on a medical examination car for a group dental examination, it is practically not possible to load two apparatuses into the medical examination car from the viewpoint of space and weight. Have difficulty. In addition, two positioning operations must be performed for one subject, that is, panoramic tomography and simple photography, and there is a problem in that the examination time per subject becomes long. Furthermore, for each subject, the panoramic tomographic image and the plain image are displayed on different video devices, respectively.
It is necessary to arrange two films on which each photographed image is displayed or to sequentially display a Palorama tomographic image and a simple photographed image on the screen of a monitor device and compare and observe them, which makes the diagnostic work troublesome. In addition, in order to make two types of captured images of each subject correspond to each other so that no error occurs, it takes much time to collect and organize the captured data.
There is such a problem.

On the other hand, the panoramic / cephalo X-ray imaging apparatus has a video apparatus for head standard imaging separately from a video apparatus for panoramic tomography, and these two video apparatuses are used alternately. In addition, it is necessary to position the subject each time the panoramic tomography and the head standard photography are performed. In addition, all other conventional apparatuses capable of performing panoramic tomography and simple imaging are also configured so that two video apparatuses, one for panoramic tomography and the other for simple imaging, are used side by side. However, there is a problem similar to the case where the above-described two apparatuses, the panoramic tomography apparatus and the simple imaging apparatus, are installed. Further, in the conventional apparatus capable of performing panoramic tomography and simple imaging, it is necessary to replace the mask in the X-ray tube side head portion each time during panoramic tomography and simple imaging.

The present invention has been made in view of the above circumstances, and is advantageous in terms of equipment cost and installation space when performing panoramic tomography and simple imaging of a temporomandibular joint. It is advantageous when loading a dental X-ray device in a medical checkup car for medical checkup,
In addition, only one positioning operation of the subject is required for X-ray imaging, diagnosis work after imaging is easy, collection and organization of imaging data are simplified, and panoramic tomography is performed as in the conventional apparatus. It is a technical object of the present invention to provide a dental X-ray imaging apparatus in which it is not necessary to replace the mask in the X-ray tube side head between the time and the time of simple imaging.

[Means for solving the problem]

The present invention provides a means for achieving the above object,
The dental X-ray apparatus was configured as follows.

That is, the dental X-ray imaging apparatus according to the present invention has the same structure as a conventional dental panoramic tomography X-ray imaging apparatus, that is, an X-ray tube is provided at one end, and an imaging means is provided at the other end in a hanging state. The rotating arm, which is supported on both sides of the examiner's head in opposition to each other, is supported and hung on a fixed base so as to be rotatable in a horizontal plane around the subject's head. X-ray mask means having a relatively wide slit for simple imaging and a narrow slit for panoramic tomography are provided on the front side of the X-ray tube, and the front side of the imaging means. X-ray introducing means having a wide opening for simple imaging and a narrow opening for panoramic tomography are provided, and the X-ray masking means and the X-ray introducing means are switched between panoramic tomography during simple imaging. Switching means to operate each Only, further, the pivoting arm,
The gist of the present invention is to provide a displacement means for displacing a rotation support portion of a fixed base between a position for simple imaging and a position for panoramic tomography.

The imaging means in the dental X-ray imaging apparatus comprises:
X-ray film cassette containing an X-ray film cassette, or an indirect imaging device consisting of an X-ray signal amplifying means and an imaging camera constitutes the above-mentioned imaging means, and the X-ray film or photosensitive material film A simple photographed image and a panoramic tomographic image can be recorded in one unit photographing section.

Further, as the image means, means for directly converting an X-ray image into an electric signal, a memory device for storing the image signal obtained by this conversion means, and reading image information from the memory device to obtain a simple photographed image It may be constituted by a monitor device which simultaneously displays a panoramic tomographic image on a screen. Instead of a means for directly converting an X-ray image into an electric signal, an X-ray fluorescent multiplier and this X-ray A television photographing device for photographing a visible image obtained by the fluorescent intensifier may be used.

[Action]

In the dental X-ray imaging apparatus having the above-described configuration, the switching means switches and operates the X-ray mask means provided on the front side of the X-ray tube and the X-ray introduction means provided on the front side of the imaging means. The displacing means displaces the rotating support portion of the rotating arm supported by the fixed base to the position for simple imaging, and stops the rotating arm supporting the X-ray tube and the imaging means at both ends at a predetermined position. In the state
An X-ray beam emitted from the X-ray tube is irradiated to the head and neck of the subject through a relatively wide slit for simple imaging of the X-ray mask means, and the transmitted X-ray is transmitted by the X-ray introducing means for wide simple imaging. By allowing the light to enter the imaging means through the opening, simple imaging of the temporomandibular joint and the like is performed. On the other hand, when performing panoramic tomography, the X-ray masking means is switched to a narrow panoramic tomographic slit by the switching means while the subject is positioned at the position for simple imaging, and the X-ray introduction means is switched to Switching to a narrow panoramic tomographic aperture, displacing the rotating support of the rotating arm to the panoramic tomographic position by the displacement means, and then rotating the rotating arm in the horizontal plane to obtain the X-ray tube and image The X-ray beam emitted from the X-ray tube is regulated in the form of a slit by the X-ray mask means while maintaining the relative position with respect to the means and rotating them around the head of the subject. The to-be-photographed tomographic plane of the portion is continuously and sequentially irradiated, and the transmitted X-rays are made to enter the imaging means through the opening of the X-ray introducing means. As described above, when this dental X-ray imaging apparatus is used, the X-ray source and the imaging means can be set at the predetermined positions by performing the positioning operation of the subject once using one X-ray imaging apparatus. Comparison of simple imaging in a stopped state and panoramic tomography while maintaining the relative positions of the X-ray source and the imaging means and rotating them around the subject's head as a series of operations It can be performed in a very short time. And in this X-ray imaging apparatus,
Since the simple imaging and the panoramic tomography are performed using a common imaging means, the simple imaging image and the panoramic tomography image can be simultaneously displayed in one unit imaging area of the imaging means, so Means that the two photographed images projected for each unit photographing area of the video means may be compared and observed.

〔Example〕

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

First, an X-ray imaging method performed using the dental X-ray imaging apparatus according to the present invention will be described with reference to FIG. In the figure, reference numeral 1 denotes a mandible viewed in the body axis direction of a subject, and one X-ray source 2 and one imaging means, an X-ray film cassette in this example, on both sides of the subject. And the X-ray film 3 housed therein are arranged to face each other. On the front side of the X-ray source 2, an X-ray mask plate 4 that can be adjusted to two types of slit widths is provided. On the front side of the X-ray film 3, two types of wide and narrow types are provided. An X-ray introduction plate 5 adjustable to the opening width is provided. 6 in the figure
Is a rotation center axis of a rotating arm that supports the X-ray source 2 and the X-ray film 3 at both ends.

In this X-ray imaging method, simple imaging and panoramic tomography are performed as a series of operations. First, X-ray source 2, X
The line film 3 and the rotation center axis 6 of the rotating arm are moved to positions A, A 'and A ", respectively, and X-rays are taken with respect to a line perpendicular to the median line 7 (a reference line connecting both outer ear holes of the subject). With the angle α in the horizontal plane formed by the radiation center line being 8 to 10 °, simple imaging of the left temporomandibular joint is performed by projecting a square on the left lower condyle from the stopped X-ray source 2. At this time, the X-ray mask Board 4
Is switched to the wide slit 9 for simple imaging, and the X-ray introduction plate is also switched to the wide opening 9 for simple imaging. Then, the X-ray beam emitted from the X-ray source 2 passes through the slit 8 for simple imaging, and is irradiated to the left jaw joint of the subject with a relatively large radiation cone angle as shown in FIG. X-rays enter the vicinity of the left edge of the X-ray film 3 through the simple imaging opening 9.

When the simple imaging of the left jaw joint is completed, the rotation center axis 6 of the rotation arm is directly moved in the direction of the arrow in parallel with the midline 7 and the rotation arm is slightly rotated about the rotation center axis 6. As a result, the X-ray source 2, the X-ray film 3, and the rotation center shaft 6 are positioned and stopped at positions B, B ', and B ", respectively. At this time, the X-ray film 3 itself is viewed from the X-ray source 2 side. The X-ray mask plate 4 is moved linearly to the left so that X-rays are incident near the right end of the region where the simple photographed image of the left jaw joint is projected. Switching to the narrow panoramic tomography slit 8 'and switching to the narrow panoramic tomography opening 9' as well as the X-ray introduction plate 5. When the above preparation is completed, the well-known panoramic tomography mechanism is used. Move the rotation center axis 6 of the moving arm Both the rotational center axis X-ray source 2 and the X-ray film 3 in the plane while maintaining their relative positions 6
While rotating around the X-ray film 3 and moving the X-ray film 3 linearly, a slit-shaped X-ray beam as shown in the figure is applied from the X-ray source 2 through the slit 8 'for panoramic tomography to cover all teeth and jaw bones. Panoramic tomography is performed by sequentially and sequentially irradiating the imaging tomographic plane. The two-dot chain line and the one-dot chain line in the figure show the trajectory of the X-ray source 2 and the irradiation direction of the X-ray beam per unit time, respectively.
In the figure, for the sake of simplicity, only the irradiation direction in the left half of the midline 7 of the dental arch is shown, but the other half is irradiated with an X-ray beam symmetrically. Since the panoramic tomography itself is no different from the conventional one, further detailed description is omitted.

At the end of the panoramic tomography, the X-ray source 2, X
The line film 3 and the rotation center axis 6 of the rotating arm reach a symmetric position with respect to the B, B ', B "positions shown with the median line 7 as a symmetry axis and stop. In this manner, the panoramic tomography is completed. Then, the rotation center axis 6 of the rotating arm is moved to the midline 7
The X-ray source 2, the X-ray film 3, and the rotation center axis 6 are moved in parallel with the X-ray source 2, the X-ray film 3, The X-ray mask plate 4 is switched to the wide slit 8 for simple radiography again, and the X-ray introduction plate 5 is also moved to a position symmetrical to the positions A, A ', and A "shown as symmetry axes. Switching to the wide aperture 9 for simple photography, simple photography is performed in the same manner as described above, and X
A simple photographed image of the right temporomandibular joint is displayed near the right edge of the line film 3.

By the above series of photographing operations, as shown in FIG.
A single radiographic image L of the left jaw joint, a panoramic tomographic image P of the dental arch, and a simple radiographic image R of the right jaw joint are projected together on one X-ray film 3 of panoramic size.

Next, a configuration example of a dental X-ray imaging apparatus for implementing the above method will be described.

FIG. 1 is a side view showing a main part of a dental X-ray imaging apparatus. This apparatus supports a photographing table 12 on a main shaft 10 vertically suspended on a base (not shown) so as to be reciprocally movable in a vertical direction.
At the upper end of the imaging table 12, a fixed arm 14 having a built-in rotating mechanism 16 is protruded in the horizontal direction, and the rotating mechanism 16 has an X-ray tube 20 at one end and an image means at the other end. The cassette holders 24 for slidably holding and holding the flat X-ray film cassette 22 containing the X-ray film are respectively supported in a hanging state, and are opposed to each other on both sides of the subject's head 26 with the head 26 interposed therebetween. The rotating arm 18 is supported via a rotation center shaft 28. The rotation arm 18 is rotated by rotating a rotation center shaft 28 by a rotation drive pulse motor 30 built in the fixed arm 14, and is rotated by a movement drive pulse motor 32 also built in the fixed arm 14. By reciprocating the entire moving mechanism 16 in the axial direction of the fixed arm 14, the moving mechanism 16 can be linearly reciprocated in the front-rear direction. Although not shown, a head fixing device for positioning and fixing the head 26 of the subject is provided at the center of the lower surface side of the rotating arm 18.

FIG. 3 shows a front view of the X-ray tube 20 in a front side housing 34 in a state in which the front plate 36 is broken, and FIG.
An X-ray mask mechanism is provided internally as shown in a sectional view taken along the arrow III. The X-ray mask mechanism includes an X-ray mask plate 38 provided with a wide slit 40 for simple imaging and a narrow slit 42 for panoramic tomography at four corners on the back side of the X-ray mask plate 38. A pair of upper and lower parallel guide rods 4 having both ends fixed to the device fixing portion via the fixed bearing 44
6 and 46, while slidably supporting the X-ray mask plate 38
The nut 48 fixed to the back side of the
A screw shaft 52 whose both ends are supported by a screw bearing 52 fixed via 50 and a screw bearing 54 fixed to the device fixing portion is screwed, and one end of the screw shaft 56 is fixed to the device fixing portion. It is connected to a step motor 58. X-ray mask plate 38
The dimensions of the slit 40 for simple imaging and the slit 42 for panoramic tomography formed in are, for example, 8 mm in width and 20 mm in length, and 1.5 mm in width and 20 mm in length. A light-shielding plate 60 is attached to the X-ray mask plate 38, and a light-transmitting unit and a light-receiving unit are provided opposite to the device fixing unit so that light is not shielded by the light-shielding plate 60 of the X-ray mask plate 38. A position detection mechanism 62 for detecting the position of the X-ray mask 38 is provided.

By the X-ray mask mechanism having the above configuration, the step motor 58 is rotationally driven based on a signal from the control unit,
Guide rod for X-ray mask plate 38 via screw shaft 56 and nut 48
Move linearly along 46, 46, and X
The position of the X-ray mask plate 38 is detected and the X-ray mask plate 38 is stopped at a predetermined position.
And the panoramic tomography slit 42 are switched.

In addition, the cassette holder 24 has an X-ray film cassette 22.
4 is provided with an X-ray introducing mechanism as shown in a fragmentary perspective view in FIG. 4 and a sectional view taken along the line VV in FIG. 4 in FIG. This X-ray introduction mechanism is provided by a window section opened in a housing 64 formed of a thick aluminum plate or the like.
On the inner side of 66, a lead thin plate 68 having a wide simple imaging opening 70 formed thereon is attached, and on the other hand, a lead thin plate 72 having a narrow panoramic tomography opening 74 formed thereon is attached to a vertical plate portion.
The movable plate 76 is fixed at both ends to a pair of mounting members 80, 80 fixed to the inner surface side of the housing 64 via bearing portions 78, 78 fixed to the lower surface of the horizontal plate portion of the movable plate 76. Slidably supported by a pair of parallel horizontal guide rods 82, 82, and a pulse motor 86 is attached to a bracket 84 fixed to the inner surface side of the housing 64, and is fixed to a rotation shaft of the pulse motor 86. A foil 88 whose outer peripheral surface is coated with urethane rubber is rotatably pressed against the upper surface of the horizontal plate portion of the movable plate 76. An example of the dimensions of the aperture 70 for simple photography and the aperture 74 for panoramic tomography is 55 mm wide and 150 mm long, and 5 mm wide and 150 mm long.
It is. Further, a position detecting mechanism 62 is provided which includes a light-shielding plate 90 attached to the movable plate 76 side and a detector 92 having a light emitting unit and a light receiving unit attached to the housing 64 side. In FIG. 5, reference numeral 96 denotes a cassette carriage, 98 denotes a carriage driving pulse motor, 100 denotes a friction wheel, and 102 denotes a guide rod.

The pulse motor 86 is driven to rotate based on a signal from the control unit by the X-ray introduction mechanism having the above-described configuration, and the movable plate 76 is moved via the wheel 88 to move the movable plate 76 to the window 66 of the housing 84. The X-ray transmitted through the subject's head and neck and radiated from the X-ray tube is placed at a position that overlaps the
The X-ray film 74 is selectively passed through the X-ray film cassette 22 and is incident on the X-ray film in the X-ray film cassette 22.

The X-ray mask mechanism and the X-ray introduction mechanism shown in FIGS. 2 and 3, respectively, and FIGS. 4 and 5 are examples of the respective structures. For example, the X-ray introduction mechanism is shown in FIG. The configuration shown in FIG. FIG. 6 is a top view of a main part of the X-ray introduction mechanism. The X-ray introduction mechanism includes a pair of left and right X-ray shields formed by attaching a lead thin plate 108 to the surface of an aluminum plate 106, respectively. Nuts 110A, 110B with left and right reverse screws threaded on the back side of plates 104A, 104B
Each screw portion of the screw shaft 112 on which the left and right screw portions are threaded is screwed to the respective nuts 110A and 110B, and the screw is screwed by a bearing 114 fixed to the device fixing portion such as a housing. In addition to supporting the shaft 112, one end of the screw shaft 112 is connected to the rotation shaft of a drive motor (not shown). By rotating the screw shaft 112 clockwise or counterclockwise by the drive motor, the opposing end faces of the pair of X-ray shield plates 104A and 104B screwed to the left and right screw portions of the screw shaft 112 are moved away from each other. Or approach, both X-ray shielding plates 104
The width of the opening 116 between the opposite end surfaces of A and 104B can be widened or narrowed to switch between the simple imaging opening and the panoramic tomography opening.

By using the dental X-ray imaging apparatus having the above configuration, the X-ray imaging method as described above can be performed.

Next, in the apparatus shown in FIG. 9, an X-ray signal amplifying means, for example, an X-ray fluorescence intensifier tube 118, and an output fluorescent surface of the X-ray fluorescence intensifier tube 118 are opposed to each other. This is an example in which an indirect photographing device including a photographing camera 120 arranged in a horizontal direction is used. In the figure, 122 indicates an X-ray tube, 124 indicates an X-ray masking means, 126 indicates an X-ray introducing means, and 128 indicates a subject.

X using the apparatus having the configuration shown in FIG.
By performing the X-ray photography method, as shown in FIG. 10, one unit photography section 1 of the roll-shaped photosensitive material film 130 is obtained.
A simple radiographic image L ′ of the left jaw joint, a dental arch panoramic tomographic image P ′, and a simple radiographic image R ′ of the right temporomandibular joint can be transferred together into 32.

By incorporating an ID number imprinting device having a light emitting diode in the photographing camera 120, as shown in FIG. 10, a part of each unit photographing section 132 of the photosensitive material film 130 or an adjacent unit photographing section If the subject number 134 can be imprinted on a portion outside the imaging region between the examination images, examination data can be obtained when a dental X-ray imaging apparatus as shown in FIG. 9 is used for a group dental examination. It is very convenient for organizing the files. In addition to the subject number, for example, an ID card in which data such as the imaging date, age, and gender are entered may be used to print the various data on a film.

The apparatus shown in FIG. 11 comprises, as image means, an X-ray fluorescence intensifier tube 118 ', an image distributor 136 arranged on the output phosphor side of the X-ray fluorescence intensifier tube 118', A cine camera 138 and a television camera 140 for photographing a visible image obtained by the X-ray fluorescence intensifier tube 118 ', a memory device 142 for storing a video signal obtained by the television camera 140, and an image from the memory device 142. And a monitor device 148 for reading information or displaying the information on the screen 150 in real time. When the above-described X-ray imaging method is performed using the apparatus having such a configuration, as shown in FIG.
A simple photographed image L ″ of the left jaw joint and a simple photographed image R ″ of the right jaw joint can be simultaneously displayed in an arbitrary arrangement together with the dental arch panoramic tomographic image P ″. As an example, a means for directly converting an X-ray image into an electric signal, for example, using a vidicon, temporarily storing a video signal obtained by the vidicon in a memory device, reading out video information from the memory device, and performing simple imaging A configuration in which an image and a panoramic tomographic image are simultaneously displayed on a screen of a monitor device may be considered.

In addition, as described above, the dental X-ray imaging apparatus according to the present invention provides a simple imaging image of a jaw joint or the like on a single X-ray film or in one unit imaging section of a roll-shaped photosensitive material film. And the panoramic tomographic image of the dental arch can be reflected together, so that the diagnostic effect can be greatly enhanced, especially when used for mass dental examination. As described above, when this dental X-ray apparatus is to be loaded on a medical examination car for a group dental examination, mechanisms and equipment required as a vehicle-mounted apparatus such as a lock mechanism for a rotating arm and a high-voltage power supply apparatus are provided. Will be added.

The dental X-ray imaging method and apparatus of the present invention have the above-described configuration, but the scope of the present invention is not limited by the above description and the contents of the drawings.
Various modifications may be included without departing from the gist of the invention. That is, as the image means, a configuration other than the above-described configuration may be used, and the configuration of the X-ray mask mechanism and the Y-ray introduction mechanism may be various configurations other than the above. In addition, the region where the simple imaging is performed is not limited to the temporomandibular joint, and the simple imaging of the maxillary sinus, the cervical spine, and the like may be performed.

〔The invention's effect〕

Since the present invention is configured and operates as described above, when using the dental X-ray imaging apparatus according to the present invention, it is possible to install a panoramic tomography apparatus and a simple imaging apparatus without installing two apparatuses. Simple imaging and panoramic tomography of the temporomandibular joint can be performed, which is advantageous in terms of installation cost and installation space. In addition, one subject
By simply performing the positioning operation a number of times, simple imaging and panoramic tomography can be continuously performed, so that the examination time per subject is reduced, and the examination efficiency is improved. Furthermore, since a simple radiographic image and a panoramic tomographic image of one subject can be simultaneously displayed within one unit radiographic area of the imaging means, diagnostic work becomes easy, and collection and organization of radiographic data are required. Hassle-free. Further, in the X-ray imaging apparatus according to the present invention, it is necessary to exchange the X-ray mask in the X-ray side head portion every time each imaging is performed, as in the conventional apparatus capable of performing panoramic tomography and simple imaging. Eliminates the workability.

The present invention has the various advantages as described above, and is particularly effective when a dental X-ray apparatus is to be loaded on a medical examination car for a group dental examination.

[Brief description of the drawings]

FIG. 1 is a side view of an essential part showing an example of the configuration of a dental X-ray imaging apparatus according to the present invention, and FIG. 2 is a view showing one example of the configuration of an X-ray mask mechanism provided in the dental X-ray imaging apparatus. FIG. 3 is a cutaway front view showing an example, FIG. 3 is a sectional view taken along line III-III of FIG. 2, FIG. 4 is a cutaway perspective view of a main part of an X-ray introduction mechanism provided in the dental X-ray imaging apparatus, 5 is a cross-sectional view taken along the line VV of FIG. 4, FIG. 6 is a plan view of a main part showing another example of the configuration of the X-ray introduction mechanism, and FIG. 7 uses an apparatus according to the present invention. For explaining a dental X-ray imaging method to be carried out in practice, FIG.
FIG. 9 is a view for explaining a projected state of a photographed image on an X-ray film, FIG. 9 is a schematic view showing another configuration example of a dental X-ray imaging apparatus, and FIG. Fig. 11 is a view for explaining a state of projection of a photographed image on a roll-shaped photosensitive material film when an X-ray imaging method is performed using the apparatus having the configuration shown in Fig. 11. Fig. 11 is a dental X-ray imaging apparatus. FIG. 12 is a schematic diagram showing still another example of the configuration, and FIG. 12 is a diagram for explaining a display state on a monitor screen when an X-ray imaging method is performed using the apparatus having the configuration shown in FIG. It is. DESCRIPTION OF SYMBOLS 1 ... Mandibular bone of a subject, 2 ... X-ray source, 3 ... X-ray film, 4 ... X-ray mask plate, 5 ... X-ray introduction plate, 6 ... Center axis of rotation of a rotating arm , 8 ... Slit for simple photography, 8 '... Slit for panoramic tomography, 9 ... Aperture for simple photography, 9' ... Aperture for panoramic tomography, 14 ... Fixed arm, 16 ... Rotating mechanism, 18: Rotating arm, 20, 122: X-ray tube, 22: X-ray film cassette, 24: Cassette holder, 26: Subject's head, 28: Rotating center axis, 30: Rotating drive pulse motor, 32… Movable drive pulse motor, 34 …… X-ray tube front side case, 38 …… X-ray mask plate, 40 …… Slit for simple imaging, 42… Slit for panoramic tomography , 46, 46… Guide rod, 48… Nut, 56… Screw shaft, 58… Step motor, 64… Housing, 70… Open for simple shooting , 74 ... Aperture for panoramic tomography, 76 ... Movable plate, 82, 82 ... Horizontal guide rod, 86 ... Pulse motor, 88 ... Foil, 104A, 104B ... X-ray shielding plate, 110A, 110B ... ... Nut, 112 ... Screw shaft, 116 ... Aperture, 118, 118 '... X-ray fluorescence intensifier tube, 120 ... Photo camera, 130 ... Rolled photosensitive material film, 132 ... Unit photography section, 136 ... video distributor, 138 ... cine camera, 140 ... television camera, 142 ... memory device, 148 ... monitor device, L, L ', L "... simple image of left jaw joint, R, R ', R "... simple photographed image of right jaw joint, P, P', P" ... dental arch panoramic tomographic image.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor, Fumiaki Akagi 3-7-18, Osumigaoka, Tanabe-cho, Tsuzuki-gun, Kyoto (72) Inventor, Yoshito Kinukawa 4--22-9, Oeda-Kitakutsukakecho, Nishikyo-ku, Kyoto, Kyoto ( 56) References JP-A-61-73637 (JP, A) JP-A-63-117732 (JP, A) Actually open Showa 63-43508 (JP, U) Actually open 2-51513 (JP, U) Actually open Hei 2-39705 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61B ^6/ 00-6/14

Claims (5)

(57) [Claims] 1. A rotating arm supporting an X-ray tube at one end and a video means at the other end in a hanging state, and supporting a head of the subject with both sides thereof opposed to each other with the head interposed therebetween. In a dental X-ray imaging apparatus rotatably supported on a fixed base in a horizontal plane around the head of the X-ray tube and hung therefrom, a relatively wide slit for simple imaging and a narrow width are provided on the front side of the X-ray tube. X-ray mask means having a slit for panoramic tomography of
In addition, an X-ray introducing means having a wide opening for simple imaging and a narrow opening for panoramic tomography is provided on the front side of the imaging means, and the X-ray masking means and the X-ray introducing means are used for simple imaging. Switching means for performing a switching operation between a panoramic tomography and a displacing means for displacing a rotation support portion of a fixed base of the rotation arm between a simple imaging position and a panoramic tomography position; A dental X-ray imaging apparatus comprising: 2. A direct photographing apparatus, wherein the image means is an X-ray film cassette containing an X-ray film, and a simple photographed image and a panoramic tomographic image are recorded in one unit photographing section of the X-ray film. The dental X according to claim 1,
X-ray equipment. 3. An indirect photographing device comprising an X-ray signal amplifying means and a photographing camera, wherein a simple photographing image and a panoramic tomographic photographing image are recorded in one unit photographing section of a photosensitive material film. The dental X-ray imaging apparatus according to claim 1. 4. An imaging means for directly converting an X-ray image into an electric signal, a memory device for storing the video signal obtained by the conversion means, and a video image information read out from the memory device to obtain a simple photographed image. 2. A dental X according to claim 1, further comprising a monitor device for simultaneously displaying a panoramic tomographic image and a panoramic tomographic image on a screen.
X-ray equipment. 5. An X-ray fluorescence intensifier, wherein the image means is a television imaging device for photographing a visible image obtained by the X-ray fluorescence intensifier.
2. A memory device according to claim 1, further comprising a memory device for storing a video signal obtained by said television imaging device, and a monitor device for reading out video information from said memory device and simultaneously displaying a simple photographed image and a panoramic tomographic image on a screen. Dental X-ray equipment.