JPH055965A - X-ray photographing device - Google Patents

Abstract

(57) [Summary] [Purpose] X that can obtain high-quality radiographic images with low exposure X
Provision of line photographing apparatus [Configuration] Intensifying screens 9 and 10 are attached to the front side supporting member 2 and the rear side supporting member 11, respectively, a film is sandwiched between the two, and the supporting members are hermetically sealed to form an internal space. An X-ray imaging apparatus for flexing the support member 11 by contacting the intensifying screen with the film by depressurizing and performing X-ray imaging in this state, wherein the front support member 2 is composed of a grid for removing scattered rays. Then, a photo timer 14, which is an X-ray detecting means for controlling the exposure amount of the film, is arranged behind the film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray photographing apparatus, and more particularly to an X-ray photographing apparatus for photographing in a state where a film and an intensifying screen are brought into close contact with each other by decompressing a space containing the film.

[0002]

2. Description of the Related Art FIG. 11 is a diagram showing an outline of an X-ray imaging system for performing X-ray imaging of a subject's chest.
Is an X-ray source having an X-ray tube, 102 is a subject, 103 is an X-ray imaging apparatus, and 104 is a pedestal that supports the X-ray imaging apparatus. 12 is an X-ray imaging apparatus 103 in FIG.
10 is an external view of the device, 105 is a supply magazine for storing unphotographed X-ray films, and 106 is a receive magazine for storing photographed films. Reference numeral 107 denotes a breast pad on which the subject closely contacts the chest, and an imaging stage for setting an imaging film is provided inside the breast pad, and the X-ray film is attached to the intensifying screen with the X-ray film on the stage. The X-ray image of the chest of the subject is imprinted on the film by irradiating.

FIG. 13 shows an internal configuration example of a conventional X-ray imaging apparatus. In the state shown in FIG. 13, the film has already been conveyed to the shooting stage, and the film and the intensifying screen have been brought into close contact with each other. An imaging stage of a conventional X-ray imaging apparatus generally has a structure as shown in the figure. 25 from the X-ray source side
Is a breast pad to which the examinee closely attaches his chest, and 19 is a grid which is a scattered ray removing member for removing scattered rays which are generated by the examinee when X-rays pass through the examinee and deteriorate image quality. 1
Reference numeral 4 denotes a photo timer which is a detector for detecting the intensity of X-rays transmitted through the subject, and controls the film exposure based on the output of the photo timer. The photo-timer 14 has a structure described later and has a surface of which the X-ray transmittance is approximately equal to that of the film surface and is substantially uniform. 9
Is the front intensifying screen, 10 is the rear intensifying screen, and each intensifying screen is X
It has a function of generating visible light in response to a ray, and an X-ray film F is sandwiched between the two. The front intensifying screen 9 is attached to the front supporting member 17, and the rear intensifying screen 10 is attached to the rear supporting member 11. Reference numeral 15 denotes a lead plate arranged between the rear intensifying screen 10 and the rear supporting member 11, which shields backscattered rays that pass through the rear intensifying screen 10 and strike a rear member. It has the effect of eliminating adverse effects on the film. Reference numeral 3 is a supply magazine which stores unused films in a stack. Reference numeral 4 is a receive magazine for storing the photographed films. Only one film F is taken out from the supply magazine 3 by a separating mechanism (not shown), and is conveyed to a photographing stage by conveying means such as the roller pairs 5 and 6, the guide plate 16. When the film F is conveyed to the shooting stage, the rear support member 11 and the rear intensifying screen 10 are at the positions shown by the chain double-dashed line in the figure. In this state, the film F is fed between the front intensifying screen 9 and the rear intensifying screen 10, and then the rear supporting member 11 to which the rear intensifying screen 10 is attached is moved in the direction of arrow A to support the rear side. The member 11 is pressed against the front support member 17, and the film F is sandwiched between the front intensifying screen 9 and the rear intensifying screen 10 and brought into close contact with each other. The rear support member 11 is replaced by the front support member 1
Since the film and the intensifying screen are brought into close contact with each other by being pressed against 7 by a strong mechanical force, the front support member 17 and the rear support member 1
1 is required to have high rigidity, for example, a thick member having a thickness of 2.5 mm is used. In this way, X-ray photography is performed on the photographing stage while the film and the intensifying screen are in close contact with each other.

[0004]

In order to obtain a high-quality X-ray photograph, it is important to minimize the distance between the subject and the film to reduce the geometric blur.
Further, in order to minimize the scattered radiation generated from the member existing between the subject and the film, and at the same time to minimize the radiation exposure to the subject, the member existing between the subject and the film is used. It is desirable to remove as much as possible. However, in the configuration of the conventional X-ray imaging apparatus illustrated above, since there is a chest pad, a grid, a photo timer, a thick front support member, and the like between the subject and the film, the subject and the film are separated by these members. The distance becomes large and the geometric blur becomes large. Further, although a highly rigid thick material is used for the front support member, scattered rays are generated from this material, and further X-rays are greatly attenuated, which causes deterioration of the image quality of the film.

There is also a problem caused by the fact that the phototimer is arranged between the subject and the film. FIG. 14 is a diagram for explaining a typical configuration of the photo timer.
31 is a phosphor layer, 32 is a mask, 33 is an acrylic plate, 3
4 is a photomultiplier for detecting light, 35 is a daylighting field with the mask 32 cut out, and 36 is a photomultiplier 34.
Is an output line connected to. Fluorescence is generated by the X-rays applied to the phosphor layer 31, and of these, the light passing through the lighting field 35 of the mask 32 is guided to the photomultiplier 34 and photoelectrically converted to be detected.

[0006] Here, in order to prevent the shadow of the daylighting field 35 from being reflected on the film, the phosphor layer must be evenly applied to the whole area other than the daylighting field to uniformly attenuate the X-rays. Further, the acrylic plate 33, which is a light guide, also needs to have a uniform thickness and at least the same size as the film. Therefore, it is difficult to reduce the size of the phototimer, and there is no freedom in designing, which hinders cost reduction.

Further, the fluorescence generated is very small, and in order to increase the detection sensitivity of the phototimer, it is conceivable to increase the thickness of the phosphor layer 31 or increase the detection sensitivity of the photomultiplier. However, since the phototimer is placed in front of the film, the phosphor layer 31 that attenuates the X-ray dose reaching the film cannot be made too thick. Further, if the detection sensitivity of the photomultiplier is increased, the detected S / N ratio will be deteriorated. Further, there is a problem that scattered X-rays are generated from the photo timer itself and the image quality of the film is deteriorated.

These are problems caused by the fact that the phototimer is located in front of the film. However, in the past, since the support member was thick, scattered rays generated here and absorption of X-rays were large, the rear of the film was large. It was difficult to position the phototimer at.

It is an object of the present invention to solve the above problems and to provide an X-ray imaging apparatus capable of obtaining a high-quality X-ray imaging image with low exposure.

[0010]

One form of the X-ray imaging apparatus of the present invention for solving the above-mentioned problems is to attach a screen to at least one of a pair of supporting members, and to attach a film between the supporting members. Is an X-ray imaging apparatus for performing X-ray photography in a state where the space between the support members is sealed and the sealed space is decompressed to bring the intensifying screen and the film into close contact with each other. It is characterized by being composed of a line removing member. Further, it is characterized in that an X-ray detecting means for controlling the exposure amount of the film is arranged behind the fed film.

[0011]

Embodiments of the X-ray imaging apparatus of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows the internal structure of an X-ray imaging apparatus for the chest or abdomen of a subject, showing the state when the film is sent to the imaging stage. 2 and 3 are partial perspective views of members near the photographing stage.

In FIG. 1, the inside of the X-ray imaging apparatus is a housing 1.
The plate-shaped front support member 2 keeps the light tight.
In this embodiment, the front support member 2 has a function of removing scattered rays generated from the subject so that a sharp image can be obtained by making the distance between the subject and the film as close as possible. It is composed of a removing member, and a grid is used in this embodiment. Further, the front support member 2 also functions as a breast pad. This configuration contributes not only to improvement of image quality but also to thinning of the device. Unphotographed films are stacked in the supply magazine 3, and photographed films are stacked in the receive magazine 4. Further, as a transporting means for loading / unloading the film to / from the photographing stage, the roller pairs 5, 6, 7 and the guide plate 1 are provided.
6 is provided. As shown in FIG. 2, a packing 8 having both airtightness and flexibility and a front intensifying screen 9 are attached to the front support member 2 by a method such as adhesion. Also, FIG.
As shown in FIG. 1, the rear intensifying screen 10 is attached to a flexible plate-shaped rear supporting member 11, and the rear supporting member 11 is attached to a frame 12. The intensifying screen does not necessarily have to be provided on both the front side and the rear side, and an image can be obtained on the film by providing at least one of them. The rear support member 11 is preferably thin and has a uniform structure with little X-ray absorption (for example, chloroprene rubber having a thickness of 0.3 mm). Although the photo timer 14, which is an X-ray detecting means, is installed inside the frame body 12 by the mounting plate 13, the shape and arrangement of the photo timer 14 are not limited to those shown in FIG. Further, a lead plate 15, which is a backscattered light shielding member, is arranged behind the photo timer 14, and the lead plate 1
5, X-rays transmitted through the photo timer 14 block back scattered rays generated by hitting a rear member. The lead plate 15 has a size that covers the entire surface of the film. As described above, in this embodiment, the photo timer 14 is arranged behind the film held on the photographing stage, which is one of the features. This is that the grid, the front support member, and the chest plate are made into one member, and the rear This arrangement is possible because the thin side support member reduces scattered X-rays and X-ray absorption. By arranging the photo timer 14 at the rear of the film, various problems caused by arranging the photo timer at the front of the photographing stage described in the above conventional example can be solved at once. Also, X reaching the film
Since the X-ray attenuation of the X-ray is small, the X-ray irradiation amount can be reduced, and there is also a great merit that the amount of exposure of the subject is small.

Also, since the phototimer 14 which is an X-ray detector is placed behind the film, the degree of freedom in the shape and arrangement of the phototimer is greatly increased. FIG. 5 is a diagram showing an example thereof. Reference numeral 31 is a phosphor layer having the same shape as the lighting field shown in the conventional example of FIG. 14, 33 is an acrylic plate, and 34 is a photomultiplier, and these members constitute the phototimer 14. Unlike the conventional case, it is not necessary to have the size over the entire surface of the film, so downsizing can be achieved and a mask is unnecessary. Further, since it is placed on the rear side of the film, the phosphor layer can be thickened, and there is no problem that a shadow is reflected, so that there is an advantage that unnecessary phosphor need not be applied.

Next, the operation of the above configuration will be described.
In FIG. 1, one film F from among a large number of films stacked and stored in the supply magazine 3 by a take-out mechanism (not shown).
Is taken out, and the taken out film F is a roller pair 5,
It is fed to the front surface of the rear intensifying screen 10 from above by driving 6. The fed film F is held at a prescribed position by a holding mechanism (not shown) so as not to slip down. This is provided in order to prevent the film from falling downward due to gravity when the film is held in and taken out from the stage, because the filming is performed while holding the film in the vertical direction. As a specific example of the holding mechanism, for example, a method of holding by suction as described in Japanese Patent Application No. 3-3254 is suitable.
When the frame body 12 is rotated in the direction of arrow B in FIG. 1 in this state, the rear support member 11 comes into close contact with the packing 8 as shown in FIG. 4, and the front support member 2, the packing 8, and the rear support member 11
The space surrounded by is closed to form a closed space containing the film F. When the pressure in the closed space is reduced by a decompression device (not shown) having a suction pump or the like, the rear support member 11 having flexibility is bent by the atmospheric pressure and the front support member 2 is bent.
Then, the front intensifying screen 9, the film F, and the rear intensifying screen 10 are held in close contact with each other. This is a so-called vacuum contact method. At this time, since the front support member 2 is also pressed toward the rear support member 11 by the same atmospheric pressure, they are pressed against each other with the same force to maintain a balanced state, and the front support member 2, that is, the grid is deformed. Unreasonable power does not work. By adopting the vacuum contact method as described above, it becomes possible to configure the front side support member 2 with a grid having relatively weak strength without using a member having high rigidity as in the conventional case.

X-ray imaging is performed in this state. The X-rays emitted from the X-ray source to the subject are selectively absorbed and transmitted by the tissues of various parts inside the body of the subject, and enter the surface of the front support member 2 having a scattered radiation removing effect. When a subject is exposed to X-rays, scattered X-rays that deteriorate the image quality are generated, and the scattered rays are selectively absorbed by the scattered radiation removing action of the front support member 2. Therefore, X-rays effective for forming an X-ray image, so-called primary X-rays, selectively reach the intensifying screens 9 and 10, and accordingly the intensifying screens 9 and 10 emit visible light. Is emitted to form a chest X-ray image of the subject on the film.
At this time, some X-rays pass through the rear intensifying screen 10 and the rear supporting member 11 and reach the phototimer 14. When the proper exposure amount is reached based on the output of the photo timer 14, the generation of X-rays is controlled so as to be blocked, and the X-ray photography is completed. The film, which has been photographed, is a roller pair 6 and a guide plate 1 as a conveying means
6, a pair of rollers 7 feeds into the receive magazine 4.

Although X-rays that reach the phototimer 14 generate scattered rays from the phototimer 14 itself, most of these scattered rays are components in the traveling direction of X-rays, and there are few backscattered rays that travel in the opposite direction. Is. Therefore, the degree of image deterioration due to scattered radiation generated from the photo timer 14 itself is extremely small as compared with the conventional case where the photo timer 14 is arranged between the subject and the film F. Further, although a small amount of X-rays are transmitted further rearward and strike a rear member to generate a backscattered ray, this scattered ray is shielded by the lead plate 15 and does not affect the image quality.

FIG. 6 is a diagram for explaining the exposure amount control based on the output of the photo timer 14. During irradiation of the subject 102 with X-rays by the X-ray source 101, the X-ray imaging apparatus 1
An X-ray intensity is detected by a photo timer 14 in 03 and photoelectrically converted, and this output is integrated by an integrator 40 having a capacitor. The accumulated charge integrated by the integrator 40 represents the exposure amount of the film. The comparator 41 compares the reference value, which is preset by the film density setting means 42 and represents the appropriate exposure amount, with the integrated value of the integrator 40. When the integrated value reaches the reference value, the X-ray photovoltage generating means 43 is controlled to stop the X-ray irradiation from the X-ray source 101 and the imaging is completed.

In the configuration of the above embodiment, the photo timer 1
4 is attached to the inside of the frame body 12 so that the phototimer moves along with the rotation of the frame. However, as a modification, as shown in FIG. 7, when the frame body 12 is rotated behind the frame body 12 as shown in FIG. Alternatively, the frame body 12 may be fixed at a position where it does not hinder the rotation, and the backscattered radiation shielding member 15 may be arranged behind the frame body 12.

According to the above embodiment, by reducing the number of members existing between the subject and the film, the distance between the subject and the film is shortened, and a good image with less geometric blur is obtained. In addition, it is possible to minimize the influence of scattered radiation generated from the member between the subject and the film, and further to minimize the X-ray absorption by the member between the subject and the film. Therefore, an X-ray imaging apparatus with high image quality and low exposure can be provided.

By disposing the X-ray detecting means such as a photo timer behind the photographing stage, a high quality image can be obtained because the shadow of the photo timer is not reflected on the film and the influence of scattered rays from the photo timer is not present as in the conventional case. As well as getting
The degree of freedom in the shape and arrangement of the X-ray detecting means is increased, and various kinds of X-ray detecting means can be used.

Another Embodiment FIG. 8 is a block diagram of another embodiment of the present invention, in which the same reference numerals as in the previous embodiment represent the same or equivalent members. The grid 19 is fixed to the housing 1 and also functions as a breast pad. Reference numeral 17 denotes a front side supporting member provided separately from the grid 19, to which the front side intensifying screen 9 and packing 8 are attached. The lower part of the front side support member 17 has a hinge 1 on the frame 12.
It is fixed so as to be openable and closable at 8, and can rotate integrally with the frame body 12. Since the front support member 17 exists between the subject and the film, it is preferable to use a material having a small plate thickness and a small X-ray absorption, and one example thereof is carbon fiber. In the present invention, since the filming stage and the intensifying screen are brought into close contact with each other by hermetically depressurizing the photographing stage by the so-called vacuum contact method, the strength of the front support member 17 is the conventional type in which the rear support member is mechanically pressed against the front support member. Less demanding and thinner than conventional X
It is composed of a low linear absorption member. The thickness of the carbon fiber is preferably less than 2.5 mm, more preferably less than 1.0 mm, and most preferably about 0.5 mm to 0.6 mm. Further, it is needless to say that the carbon fiber is not limited and members made of various materials can be used.

A rear side support member 11 such as rubber, a rear side intensifying screen 10, a photo timer 14 and a lead plate 15 are attached to the frame 12 in the same manner as in FIG. The shape and the degree of freedom of the arrangement of the photo timer 14 are the same as in the previous embodiment.
In the state shown in FIG. 8, the film F is fed from the supply magazine 3 to the front surface of the rear intensifying screen 10 and the holding mechanism (not shown) holds the film at the specified position. Then, the frame 12 is slightly rotated in the direction C in the figure. The packing 8 and the rear support member 11 are hermetically sealed to form a hermetically sealed space containing the film F. Then, the depressurization mechanism (not shown) starts depressurization in the closed space, and the film F and the intensifying screens 9 and 10 start to adhere to each other. Normally, it takes several seconds to several tens of seconds for decompression, but during this decompression period, this unit is moved to a position where the hinge 18 is pivoted to the position just behind the grid 2 of the photographing stage as a pivot. That is, since the transition is performed during the pressure reduction, the throughput is improved as compared with the previous embodiment. The unit is fixed at the shifted position to perform X-ray photography, and after the photography, the operation is reversed to return to the state of FIG. 8 and the film is discharged.

By modifying the configuration of this embodiment, when the film is put in and taken out from the photographing stage, the stage is laid down to a completely horizontal state or a state close thereto, and the film is carried into the stage in the horizontal state and hermetically sealed. Alternatively, the unit may be rotated 90 degrees to start the depressurization and shift to the image-capable state. By adopting such a configuration, the film is in a horizontal state when there is no adhesion by the intensifying screen at the time of loading and unloading, so that the film does not fall down due to gravity, and the film holding mechanism is unnecessary.

According to this embodiment, the distance between the subject and the film is small, and the generation of scattered radiation and the attenuation of X-rays are small, so that a good photographed image can be obtained and the X-ray irradiation dose can be reduced. And low exposure. Further, since the pressure reduction and the transfer are performed at the same time, the throughput is improved.

Another Embodiment Next, a further embodiment of the present invention will be described with reference to FIG. In this embodiment, a grid having different focal lengths can be replaced according to the imaged region so that different regions can be imaged by using a single device. For example, considering the case of imaging the chest and abdomen of a subject, since the abdomen absorbs more X-rays than the chest, the distance between the X-ray source and the film is set to about 180 cm for chest imaging. In the case of photographing, it is set to about 150 cm, and grids having different focal lengths corresponding to the respective distances are used.

In the previous embodiment shown in FIG. 1, the front side supporting member is composed of a grid and the front side intensifying screen 9 is directly attached to the grid in order to minimize the distance between the subject and the film.
In the present embodiment shown in FIG. 9, the front side intensifying screen 9 is attached to the front side supporting member 17 having a small X-ray absorption and a light shielding property, and the replaceable grid 19 is arranged in front of the front side supporting member 17. The grid 2 is detachably held along the rails 18, and is fixedly held at a prescribed position by a stopper when mounted on the device. FIG. 10 shows how the grid 2 slides along the rails 18. Front support member 17
Has a light-shielding property, so the light-shielding inside the device is maintained even when the grid is replaced.

Since the front side support member 17 is present between the subject and the film, it is preferable to use a material having a small plate thickness and a small X-ray absorption. One example is carbon fiber. In the present invention, since the filming stage and the intensifying screen are brought into close contact with each other by hermetically depressurizing the photographing stage by the so-called vacuum contact method, the strength of the front support member 17 is the conventional type in which the rear support member is mechanically pressed against the front support member. Less demanding and thinner than conventional X
It is composed of a low linear absorption member. The thickness of the carbon fiber is preferably less than 2.5 mm, more preferably less than 1.0 mm, and most preferably about 0.5 mm to 0.6 mm. Further, it is needless to say that the carbon fiber is not limited and members made of various materials can be used.

According to this embodiment, the grid can be easily exchanged according to the region to be imaged, and various images can be taken. Further, since the distance between the subject and the film is small and the scattered X-rays and the attenuation of X-rays are also small, a good photographed image can be obtained and the X-ray irradiation dose can be reduced to achieve low exposure. ..

[0029]

According to the X-ray imaging apparatus of the present invention, a high quality photographed image can be obtained with low exposure, and the flexibility of the shape and arrangement of the X-ray detecting means is increased, so that various kinds of X-ray detection can be performed. Means can be used.

[Brief description of drawings]

FIG. 1 is an internal configuration diagram of an X-ray imaging apparatus according to an embodiment of the present invention, showing a state in which a film is sent to an imaging stage.

FIG. 2 is a partial configuration diagram centering on a front support member.

FIG. 3 is a partial configuration diagram centering on a rear support member.

FIG. 4 is an internal composition of an example, showing a state in which preparation for shooting is completed.

FIG. 5 is a diagram showing an example of the shape of a photo timer.

FIG. 6 is an explanatory diagram of exposure amount control.

FIG. 7 is a modification of the embodiment.

FIG. 8 is a configuration diagram of another embodiment of the present invention.

FIG. 9 is a configuration diagram of still another embodiment of the present invention.

FIG. 10 is an external view of still another embodiment of the present invention.

FIG. 11 is a schematic diagram of a chest radiography system.

FIG. 12 is an external view of an X-ray imaging apparatus.

FIG. 13 is an internal configuration diagram of a conventional X-ray imaging apparatus.

FIG. 14 is a configuration example of a conventional photo timer.

[Explanation of symbols]

 2 Front support member (grid) 3 Supply magazine 4 Receive magazine 8 Packing 9 Front intensifying screen 10 Rear intensifying screen 11 Rear supporting member 12 Frame 14 Photo timer 15 Lead plate 17 Front supporting member 19 Grid

Claims (1)

Claim: What is claimed is: 1. A intensifying screen is attached to at least one of a pair of support members, a film is fed between the support members to seal the space between the support members and to close the sealed space. An X-ray imaging apparatus for performing X-ray imaging in a state in which the intensifying screen and the film are brought into close contact with each other under reduced pressure, wherein the front supporting member is constituted by a scattered radiation removing member. 2. A sensitizing screen is attached to at least one of a pair of support members, a film is fed between the support members to seal the space between the support members and reduce the pressure in the closed space to perform the sensitization. X with the paper and film in close contact
An X-ray imaging apparatus for performing radiography, characterized in that a front side support member is made of an X-ray low absorption substance, and a scattered radiation removing member is arranged on the X-ray generation source side of the front side support member. X
X-ray equipment. 3. The X-ray imaging apparatus according to claim 2, wherein the front support member is a carbon fiber. 4. The front support member has a thickness of 2.5 mm.
The X-ray imaging apparatus according to claim 2, which is less than 3. 5. The X-ray imaging apparatus according to claim 2, wherein the scattered radiation removing member is detachably arranged. 6. The X-ray imaging apparatus according to claim 1, further comprising an X-ray detection unit arranged behind the fed film for controlling an exposure amount of the film. 7. The X-ray imaging apparatus according to claim 6, wherein an X-ray shielding member is arranged behind the X-ray detecting means. 8. The X-ray imaging apparatus according to claim 1, wherein the scattered radiation removing member is a breastplate. 9. A sensitizing screen is attached to at least one of a pair of support members, a film is fed between the support members to seal the space between the support members and reduce the pressure in the closed space to perform the sensitization. X with the paper and film in close contact
An X-ray imaging apparatus for performing X-ray imaging, wherein X-ray detection means for controlling the exposure amount of the film is arranged behind the fed film. 10. The X-ray imaging apparatus according to claim 9, wherein an X-ray shielding member is arranged behind the X-ray detecting means. 11. The X according to claim 6, further comprising: an X-ray irradiating means for irradiating X-rays, and a means for controlling the operation of the X-ray irradiating means based on the output of the X-ray detecting means. X-ray equipment. 12. An X-ray imaging apparatus, wherein an intensifying screen is attached to at least one of a pair of supporting members, and X-ray imaging is performed in a state where the intensifying screen and the film are in close contact with each other.
An X-ray imaging apparatus, characterized in that the support member on the front side is composed of a scattered radiation removing member. 13. An X-ray imaging apparatus, wherein an intensifying screen is attached to at least one of a pair of supporting members, and X-ray imaging is performed with the intensifying screen and the film in close contact with each other.
An X-ray imaging apparatus, characterized in that an X-ray detection means for controlling the exposure amount of the film is arranged behind the film.