JPH06250302A - X-ray radiographing device - Google Patents

Abstract

PURPOSE:To facilitate the exchange of a hermetic member or intensifying screen by providing this hermetic member with recessed parts for clamping at least one of supporting members. CONSTITUTION:The section of the hermetic member 8 has the recessed parts at two points. A cover 1 fits into the one recessed part 8' and the supporting member 2 and the intensifying screen 9 are simultaneously clamped in the other recessed part 8''. The recessed part 8' exists on the entire outer periphery of the hermetic member 8 and a front cover 1 is fitted into this recessed part 8' to shield light. The recessed part 8'' exists on the entire inner periphery of the hermetic member 8 and the light is shielded in the same manner by fitting the supporting member 2 therein. Further, the front side intensifying screen 9 is also fitted simultaneously with the supporting member 2 into the recessed part 8'' and the front side supporting member 2 and the front side intensifying screen 9 are simultaneously clamped by this recessed part 8''. The hermetic member 8 is mounted by means, such as sticking to a picture frame- shaped sheet. This picture frame-shaped sheet is mounted to the front side supporting member 2 similarly by means, such as sticking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray imaging apparatus for performing X-ray imaging by bringing a film for X-ray imaging and an intensifying screen into close contact with each other by decompression.

[0002]

2. Description of the Related Art FIG. 6 shows an outline of a conventionally known X-ray imaging system for performing chest X-ray imaging of a subject. In this figure, 101 is an X-ray tube and 102 is an X-ray tube.
Is a subject, 103 is an X-ray imaging apparatus, and 104 is a pedestal that supports the X-ray imaging apparatus.

FIG. 7 shows an X-ray imaging apparatus 103 shown in FIG.
FIG. 105 is an external view of the device, 105 is a supply magazine for accommodating unphotographed X-ray film, and 106 is a photographed X
It is a receive magazine that stores the line film. 107
Is a breastplate to which a subject closely contacts his chest, and an imaging stage for setting an X-ray film is provided inside the breastplate. At this imaging stage, the X-ray film and the intensifying screen are brought into close contact with each other, and the X-ray is irradiated from the X-ray tube 101 in this close contact state, whereby the subject 1 is placed on the X-ray film.
02 chest X-ray image is imprinted. In addition, an automatic exposure device (a so-called photo timer) is arranged on the imaging stage in order to keep the X-ray photographic density constant.

By the way, in order to take a clear X-ray photograph with high diagnostic ability using such an X-ray photographing apparatus, it is necessary to sufficiently adhere the X-ray film and the intensifying screen. Further, when the X-ray hits a substance, scattered X-ray is generated, and this scattered X-ray may deteriorate the image quality.
It is desirable that there be as few members as possible between the X-ray film and the X-ray film.

The applicant of the present application filed a Japanese patent application No. 3-28, filed on June 28, 1991, as an X-ray imaging apparatus in which the X-ray film and the intensifying screen are sufficiently adhered and the scattered X-rays are small. 1
No. 58468 proposes an X-ray imaging apparatus shown in FIG. In this application, in order to bring the X-ray film and the intensifying screen into close contact with each other, the vacuum contacting system by depressurization is adopted as the contacting method between the X-ray film and the intensifying screen. Also,
In order to minimize scattered X-rays, the front support member also serves as a chest pad and is composed of a grid which is a scattered radiation removing member. Further, the phototimer is arranged behind the rear support member to eliminate the influence of scattered X-rays generated from the phototimer.

In FIG. 8, the inside of the X-ray imaging apparatus is kept light-tight by a cover 111 and a front support member 112. The front support member 112 is composed of a grid that is a scattered radiation removing member that removes scattered radiation generated from the subject. Further, the front support member 112 also functions as a breast pad. The unphotographed X-ray film is laminated in the supply magazine 113, and the photographed X-ray film is laminated in the receive magazine 114.

In addition, a roller pair 11 for transporting or retreating the X-ray film to the photographing stage is provided inside thereof.
5, 116 and 117 and a guide plate 126 are provided. An airtight and flexible sealing member 118 and a front intensifying screen 119 are attached to the front supporting member 112 by a method such as bonding. The rear intensifying screen 120 is a flexible rubber sheet 121, and the rubber sheet 121 is the frame 1.
It is attached to each 22 by a method such as adhesion. Further, the photo timer 1 is provided behind the rubber sheet 121.
Further, a lead plate 125 is disposed behind the phototimer 124 as a member that shields the backscattered rays generated when the X-rays transmitted through the phototimer 124 hit a rear member.

In the state of FIG. 8, the X-ray film F is taken out from the supply magazine 113, sent to the front surface of the rear intensifying screen 120, and held at a predetermined position by a holding mechanism (not shown). In this state, when the frame 122 is rotated in the direction of arrow E in FIG. 8, the rubber sheet 121 comes into close contact with the sealing member 118, and the space surrounded by the front support member 112, the sealing member 118, and the rubber sheet 121 becomes X. A closed space containing the line film F is formed. Here, when the space is decompressed by decompression means (not shown), the flexible rubber sheet 121 is bent by the atmospheric pressure and is pressed toward the front support member 112, and the front intensifying screen 119 and the X-ray film are pressed. F, the rear intensifying screen 120 comes into close contact. In this way, X-ray photography is performed with the X-ray film F and the intensifying screens 119 and 120 in close contact with each other on the photography stage.

[0009]

As described above, the space surrounded by the front support member 112, the sealing member 118, and the rubber sheet 121 forms a sealed space containing the X-ray film F. Rubber is generally used as the material of the airtight and flexible sealing member 118.
Since it deteriorates with time due to ultraviolet rays and the like, it needs to be replaced periodically in order to maintain high airtightness.

However, in the conventional example, the sealing member 11
Since 8 is adhered to the front support member 112 or directly attached with a double-sided tape or the like, if the user peels off the sealing member to be replaced and then tries to bond a new sealing member, Since it was not determined, it was difficult to bond it at a predetermined position because it stretched or bent when it was attached.

On the other hand, as the number of images taken increases, the surface of the intensifying screen is damaged, and finally the image quality of the X-ray photograph is deteriorated. Therefore, the intensifying screen must be replaced regularly. When the intensifying screen is attached over the entire surface of the supporting member, it takes time and effort to remove the intensifying screen from the supporting member. Japanese Patent Laid-Open No. 59-14
Japanese Patent No. 7141 discloses that the inconvenience described above is solved by a method in which an intensifying screen is attached to an X-ray transmissive sheet having a size larger than that of the intensifying screen and the sheet is fixed to a supporting member. There is.

When this intensifying screen attachment method is applied to an X-ray photographing apparatus of the type in which the X-ray film and the intensifying screen are brought into close contact with each other by decompression, a method for fixing the intensifying screen as shown in FIG. 9 can be considered. However, the applicant of the present application has found that it has the following problems. FIG. 9 is an enlarged view of a portion corresponding to the J portion of FIG.

In FIG. 9, 111 is a front cover,
A front support member 112 is fixed to the front cover 111. The front side intensifying screen 119 is provided inside the front side supporting member 112.
The sealing member 118 and the front intensifying screen 119 are adhered to a larger size X-ray transparent sheet 127. A mounting member 128 is attached to a part of the seat 127, and the mounting member 128 is attached to the front cover 1.
It is fixed to 11 with screws 129.

In this example, when the front side intensifying screen 119 is replaced, the sealing member 118 and the front side intensifying screen 119 are put on the sheet 127.
Can be easily replaced with the sealing member 118 and the front intensifying screen 1.
19 can be exchanged. However, in this example, when the X-ray film and the intensifying screen are brought into close contact with each other by depressurization,
As shown in (4), since the adhesion starts from the peripheral portion and the peripheral portion of the sheet 127 is deformed in the G direction, air is trapped in the H portion, which causes a new problem that the adhesion is not completely performed.

In order to prevent the sheet 127 from being deformed, the sheet 127 may be made of a stronger aluminum plate, carbon fiber plate, or the like, but in terms of X-ray transparency and cost.
Each is not preferable. Further, in this case, scattered X-rays are generated from the aluminum plate or the carbon fiber plate, or the distance between the X-ray film and the subject becomes long.

In order to prevent the seat 127 from being deformed in the G direction in FIG. 10, the front support member 112 and the seat 1 are prevented.
27 should be pasted over the entire surface, but with this method,
As mentioned above, it is very difficult to replace the intensifying screen.

The present invention has been made in view of the above circumstances, and an object thereof is to feed a film between a pair of support members having at least one intensifying screen attached thereto, and then seal the film with a sealing member. In an X-ray imaging apparatus in which the space between the supporting members is decompressed to bring the intensifying screen and the film into close contact with each other, the sealing member or the intensifying screen can be easily replaced.

[0018]

In order to achieve the above-mentioned object, the present invention is to seal a film by feeding a film between a pair of support members having an intensifying screen attached to at least one of them and then sealing the film by a sealing member. In the X-ray imaging apparatus that decompresses the space between the supporting members to bring the intensifying screen and the film into close contact with each other, the sealing member has a concave groove that holds at least one of the supporting members. I am trying.

Further, after feeding the film between a pair of supporting members having an intensifying screen attached to at least one of them,
In an X-ray imaging apparatus for decompressing the space between the support members sealed by a sealing member to bring the intensifying screen and the film into close contact, the sealing member is a frame-shaped sheet having an outer shape larger than that of the intensifying screen. The sealing member is attached to one of the supporting members via the sheet.

[0020]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a sectional view showing an embodiment of the X-ray imaging apparatus according to the present invention. FIG. 2 is an enlarged view showing a cross section of the portion A in FIG. 1, showing a state in which the X-ray film is fed to the imaging stage. FIG. 3 is a view of the front intensifying screen section viewed from the direction of arrow B in FIG.

In FIG. 1, 1 is a cover for covering the main body of the apparatus, 2 is a front side supporting member which also functions as a breast pad,
In this embodiment, the grid is a scattered radiation removing member.
The unphotographed X-ray film is already photographed in the supply magazine 3.
The line films are stacked on the receive magazine 4, respectively. The roller pairs 5, 6, 7 and the guide plate 16 are provided to convey or retreat the X-ray film on the photographing stage. 8 is a sealing member having airtightness and flexibility,
9 is a front side intensifying screen, 10 is a rear side intensifying screen, 11 is a rear side supporting member, 12 is a flexible rubber sheet, and F is an X-ray film.

As shown in FIG. 2, the sealing member 8 has a cross section of 2
The cover 1 is recessed into one of the recesses 8 ′, and the front support member 2 and the front intensifying screen 9 are provided in the other recess 8 ″.
Are clamped at the same time. The recess 8 ′ is on the entire outer circumference of the sealing member 8, and the front cover 1 is fitted into this recess 8 ′ to shield light. Further, the recess 8 ″ is provided on the entire inner circumference of the sealing member 8, and the front support member 2 is fitted therein to similarly shield light. The recess 8 ″ includes the front support member 2 and the front intensifying screen at the same time. 9 is also recessed, and the front side support member 2 and the front side intensifying screen 9 are simultaneously sandwiched by the recess 8 ″.

FIG. 3 is a view of the front intensifying screen portion as seen from the direction of arrow B in FIG. 1, but since the outer periphery of the front intensifying screen 9 is fitted into the concave portion 8 "of the sealing member 8, it is generally used. The outside of the intensifying screen is larger than that of the intensifying screen, and there are a plurality of holes 9'on the periphery of the X-ray film to be used. However, the air is prevented from being trapped inside, that is, the air can freely move through the hole 9 ′, so that there is no pressure difference between the front and back of the front intensifying screen 9 and the front intensifying screen 9 There is no deformation around the area.

In FIG. 3, the part indicated by the chain double-dashed line corresponds to the X-ray film F, and the phosphor may be present only in this part. In this embodiment, a plurality of holes 9 ′ are formed in the front intensifying screen 9 for the movement of air, but a part of the outer periphery of the front intensifying screen 9 is cut out to fit into the recess 8 ″ of the sealing member 8. You can make a part that does not.

The rear intensifying screen 10 is attached to the rear supporting member 11 with double-sided tape or the like. Rear support member 11
Has a central portion that is convex toward the front intensifying screen 2 so that the X-ray film F and the intensifying screen 10 can be brought into close contact with each other in a short time. As a material, a carbon fiber having a small amount of backscattered rays and good X-ray transparency is suitable.

The double-sided tape suitable for use herein is preferably a double-sided tape for fixing the resin printing plate, for example, a type having different adhesive strengths on the front and back surfaces of the double-sided tape. When a surface having a high adhesive strength is attached to the surface of the rear intensifying screen 10 and a surface having a weak adhesive strength is attached to the surface of the rear supporting member 11, the rear intensifying screen 10 is replaced when the rear intensifying screen 10 is replaced. Rear support member 11
When it is peeled off, the double-sided tape sticks to the rear intensifying screen 10, so that the rear intensifying screen 10 can be easily replaced. It is difficult to remove the double-sided tape when it is applied to the entire surface, so it is desirable to partially apply the outer periphery of the rear intensifying screen 10.

The rear side support member 11 is a flexible rubber sheet 1.
2, the rubber sheet 12 is attached to the frame 13.
Further, a photo-timer 14 is arranged behind the photographing stage, and a lead plate 15 is arranged behind the photo-timer 14 as a member for shielding the backscattered rays generated when the X-rays transmitted through the photo-timer 14 hit a rear member. There is.

In the state of FIG. 1, the X-ray film F is taken out from the supply magazine 3, fed to the front surface of the rear intensifying screen 10, and held at a predetermined position by a holding mechanism (not shown).
In this state, when the frame 13 is rotated in the direction of arrow C in FIG. 1, the rubber sheet 12 comes into close contact with the sealing member 8 as shown in FIG.
The space D surrounded by the front support member 2, the sealing member 8 and the rubber sheet 12 forms a sealed space containing the X-ray film F.

When the space is decompressed by decompression means (not shown), the rubber sheet 1 having flexibility due to the atmospheric pressure.
2 bends and is pressed toward the front support member 2, and the front intensifying screen 9, the X-ray film F, and the rear intensifying screen 10 come into close contact with each other. In this way, X-ray photography is performed with the X-ray film and the intensifying screen in close contact with each other on the photography stage.

When the damaged front intensifying screen 9 is replaced with a new front intensifying screen, the damaged front intensifying screen 9 is removed from the concave portion 8 "of the sealing member 8 and the new front intensifying screen 9 is replaced with the sealing member 8. It suffices to fit it in the recess 8 ″. As described above, the rear intensifying screen 10 is attached with the double-sided tapes having different adhesive strengths on the front and back sides, so that it can be easily replaced.

When the sealing member 8 is replaced, the front intensifying screen 9 and the front supporting member 2 are removed from the concave portion 8 ", the sealing member 8 is then removed from the cover 1, and the reverse procedure is followed.
A new sealing member 8 may be fitted into the cover 1 and then the front support member 2 and the front intensifying screen 9 may be fitted into the recess 8 ″ of the sealing member 8.

FIG. 4 shows an example in which the sealing member 8 can be easily replaced without complicating the shape of the sealing member 8. Reference numeral 1 is a cover, 2 is a front side supporting member, and 17 is a notch in the central portion. Is a frame-shaped sheet, 8 is a sealing member, and 9 is a front intensifying screen. The sealing member 8 is attached to the frame-shaped sheet 17 by means such as pasting.
Similarly, 7 is attached to the front support member 2 by means such as pasting.

If the outer dimension of the frame-shaped sheet 17 is the same as the outer dimension of the front support member 2, the frame-shaped sheet 17 is formed.
Is easy to attach when attaching to the front support member 2. A front side intensifying screen 9 is attached to the inside of the front side supporting member 2 (a cutout portion of the frame-shaped sheet 17) with a double-sided tape.

A suitable double-sided tape used here is a double-sided tape for fixing the resin printing plate, for example, a type having different adhesive strengths on the front surface and the back surface of the double-sided tape. If a surface having a high adhesive strength is attached to the front intensifying screen 9 side and a surface having a weak adhesive strength is attached to the front supporting member 2, the front intensifying screen 9 is replaced with the front supporting member 2 when the front intensifying screen 9 is replaced. Since the double-sided tape adheres to the front intensifying screen 9 side when peeled from the front side, the front side intensifying screen 9 can be easily replaced. In this way, the frame-shaped sheet 17, the sealing member 8, and the front support member 2 to which the front intensifying screen 9 is attached are attached to the cover 1 by a method not shown.

The replacement of the sealing member 8 is performed by the frame-shaped sheet 17
Since it is performed together with the frame-shaped sheet 17 by removing the sheet from the front support member 2, the sheet 17 is preferably made of a Mylar sheet, which is inexpensive. Material such as aluminum may be used,
Not suitable for cost.

In order to easily replace the sealing member 8,
When attaching the frame-shaped sheet 17 to the front support member 2,
Similar to the attachment of the front intensifying screen 9, double-sided tapes having different adhesive strengths on the front and back sides are used, and the surface having the weak adhesive strength is attached to the front support member 2 side, whereby the frame-shaped sheet 1
7 can be easily peeled off from the front support member 2. Further, since the sheet 17 has a frame shape and has a small area for attaching the double-sided tape, it can be easily peeled off. After that, a new frame-shaped sheet 17 to which the sealing member 8 is attached may be attached to the front support member 2 in conformity with the outer shape.

If only the sealing member 8 is to be replaced by the user, since the material of the sealing member 8 is a flexible rubber, the waist is not fixed and the elastic member 8 stretches or bends. For this reason,
Although the attaching work is difficult, in the present embodiment, since it is attached to the frame-shaped sheet 17 in advance, it is sufficient to attach the sheet 17 to the front support member 2 in accordance with the outer shape, and the operation at the user's end can be performed. You can easily.

With the above-mentioned structure, the sealing member 8 can be replaced easily and inexpensively without complicating the shape of the sealing member 8.

(Other Embodiments) FIG. 5 shows another embodiment of the present invention, in which a standard size front intensifying screen is used. This is an example in which the sheet 18 is once attached to an X-ray transmissive sheet 18 having a large size, and a part of the sheet 18 is sandwiched with the support member 2 in the recess 8 ″ of the sealing member 8. Intensifying screens can be used.

As another method of using the standard size intensifying screen, the front side supporting member 2 is clamped in the recess 8 "of the sealing member 8, and the standard size intensifying screen 9 is placed on the front and back sides of the front supporting member 2. It is also possible to use a double-sided tape having different adhesive strengths for attachment.

[0041]

As described above, according to the present invention, since the sealing member is provided with the concave groove and at least the supporting member is sandwiched by the groove, the user can replace the intensifying screen or the sealing member. It can be easily performed in a short time.

Further, according to the present invention, since the sealing member is attached to the frame-shaped sheet and the sheet is attached to the supporting member, the shape of the sealing member is not complicated.
The sealing member can be easily replaced.

[Brief description of drawings]

FIG. 1 is a diagram showing a cross section of an embodiment of an X-ray imaging apparatus of the present invention.

FIG. 2 is an enlarged view showing a portion A of FIG.

FIG. 3 is a diagram showing a front intensifying screen section in the direction of arrow B in FIG.

FIG. 4 is a view showing an example in which a sealing member having a simple shape facilitates replacement.

FIG. 5 is a diagram showing another embodiment.

FIG. 6 is a diagram showing an example of a chest X-ray imaging system.

FIG. 7 is a diagram showing an appearance of an X-ray imaging apparatus.

FIG. 8 is a diagram showing a conventional example.

FIG. 9 is an enlarged view showing a J portion of FIG.

FIG. 10 is a view for explaining a contact state between an intensifying screen and an X-ray film.

[Explanation of symbols]

 2 Front support member 8 Sealing member 9 Front intensifying screen 10 Rear intensifying screen 11 Rear supporting member 17 Frame-shaped sheet F X-ray film

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Naoki Yuguchi 53 Imaiuemachi, Nakahara-ku, Kawasaki-shi, Kanagawa Canon Inc. Kosugi Plant

Claims (8)

[Claims] 1. A film is fed between a pair of support members, at least one of which has an intensifying screen attached thereto, and the space between the support members sealed by a sealing member is decompressed to reduce the intensifying screen. The X-ray imaging apparatus for closely contacting the film, wherein the sealing member has a concave groove that holds at least one of the supporting members. 2. The X-ray imaging apparatus according to claim 1, wherein the sealing member further has a concave groove that holds the apparatus main body cover. 3. The X-ray imaging apparatus according to claim 1, wherein the groove also holds the intensifying screen. 4. The X according to claim 1, wherein the support member and the intensifying screen are substantially directly bonded to each other.
X-ray equipment. 5. The X-ray imaging apparatus according to claim 1, wherein one of the support members is a scattered radiation removing member. 6. A screen is fed between a pair of support members having at least one intensifying screen attached thereto, and then the space between the support members sealed by a sealing member is decompressed and the intensifying screen and In the X-ray imaging apparatus for closely contacting the film, the sealing member is attached to a frame-shaped sheet having an outer shape larger than the intensifying screen, and the sealing member is attached to one of the supporting members via the sheet. X-ray imaging device. 7. The X according to claim 6, wherein the support member and the intensifying screen are substantially directly joined to each other.
X-ray equipment. 8. The X-ray imaging apparatus according to claim 6, wherein one of the supporting members is a scattered radiation removing member.