JPH01185629A - Radiographic information recorder/reader - Google Patents

Abstract

PURPOSE:To carry out subtraction very quickly by simultaneously recording radiographic images of different energy on two belt-like accumulating phosphor sheets and reading them simultaneously and concurrently. CONSTITUTION:The two belt-like accumulating phosphor sheets 26 and 26' are placed so as to be conveyed longitudinally, and a filter such as a copper sheet is arranged between them. A radial ray source 33 projects radial rays to accumulate and record a piece of radiographic information possessing differ ent energy on the sheets. Exciting light from laser beam sources 51 and 51' is projected on said information, whereby picture signals logS1 and logS2 made of stimulated phosphorescence are obtained. A arithmetic part 83 in an image reading circuit 57 subtracts said signals, and a specific structure in an image is extracted by their difference signal. As a result, subtraction is carried out quickly, which is utilized in a group checkup, etc.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention accumulates and records radiation image information on a stimulable phosphor sheet, then irradiates the same with excitation light, and generates images according to the accumulated and recorded image information. The present invention relates to a radiation image information recording/reading device that detects photostimulated light and reads image information as an electrical image signal.More specifically, it is capable of obtaining an image signal that extracts and represents only some structures in an image. The present invention relates to a radiographic image information recording/reading device.

(Prior art) When a certain type of phosphor is irradiated with radiation (X-rays, α-rays, β-rays, γ-rays, ultraviolet rays, electron beams, etc.), part of the energy of this radiation is accumulated in the phosphor. Then, when the phosphor is irradiated with excitation light such as visible light, the phosphor exhibits stimulated luminescence depending on the accumulated energy. A phosphor exhibiting such properties is called a stimulable phosphor (stimulable phosphor).

Using this stimulable phosphor, radiation image information of a subject such as a human body is recorded on a stimulable phosphor sheet (hereinafter referred to as a stimulable phosphor sheet), which is then scanned with excitation light and illuminated. A method has been proposed in which the stimulated emitted light is photoelectrically read to obtain an image signal, and the image signal is processed to obtain a radiographic image of a subject that is suitable for diagnosis (for example, Japanese Patent Application Laid-Open No. 1983-1981). No. 12429, No. 55-116340, No. 55-163472, No. 56-11395, No. 56-104645, etc.). This final image can be reproduced as a hard copy or on a CRT. In any case, in such a radiation image information recording and reproducing method, image information is not ultimately recorded on the stimulable phosphor sheet, but the image information is temporarily recorded on the final recording medium as described above. Since this stimulable phosphor sheet carries information, it may be used repeatedly, and such repeated use is extremely economical.

In order to reuse the stimulable phosphor sheet as described above, the radiation energy remaining in the stimulable phosphor sheet after the stimulated luminescence light has been read can be absorbed by, for example,
As shown in No. 2, No. 56-12599, residual radiation images may be erased by irradiating the sheet with light or heat, and the stimulable phosphor sheet may be used again for recording radiation images.

On the other hand, subtraction processing of radiographic images has been conventionally known. This radiographic image subtraction is a process in which two radiographic images taken under different conditions are photoelectrically read out to obtain digital image signals, and then these digital image signals are subtracted by matching each pixel of both images. , is a method of obtaining a difference signal that extracts a specific structure in a radiographic image, and if the difference signal obtained in this way is used,
It is possible to reproduce a radiographic image in which only specific structures are extracted.

There are basically two methods for this subtraction process: In other words, the image signal of a radiographic image in which no contrast agent has been injected is subtracted from the image signal of a radiographic image in which a specific structure has been emphasized by contrast agent injection (subtraction).
So-called temporal subtraction processing, which extracts specific structures by By irradiating the radiation onto a means, an image in which a specific structure is different is created between two radiation images, and then subtraction (subtraction) is performed after appropriately weighting the image signals of the two radiation images. This is a so-called energy subtraction process that extracts images of specific structures.

Since this subtraction processing is an extremely effective method, especially in medical diagnosis, it has attracted much attention in recent years, and its research and development are actively progressing by making full use of electronic engineering technology.

In the radiation image information recording and reproducing system using the stimulable phosphor sheet described above, the radiation image information recorded on the sheet is directly read in the form of an electrical image signal, so according to this system, It becomes possible to easily perform the subtraction process as described above. When performing energy subtraction processing using this stimulable phosphor sheet, if a radiation energy conversion filter made of a copper plate or the like is placed between two stimulable phosphor sheets, for example, the radiation transmitted through the subject can be By irradiating these two sheets simultaneously, images with different specific structures can be recorded on both sheets (so-called one-shot energy subtraction).

Therefore, in order to actually perform this one-shot energy subtraction processing, radiation image information recording (
The photographing) device is configured to record (photograph) radiation image information by arranging two stimulable phosphor sheets and an energy conversion filter as described above, and after recording the radiation image information. For the two stimulable phosphor sheets, reading processing similar to normal reading processing is sequentially performed to obtain two sets of image signals.

(Problem to be Solved by the Invention) However, if two stimulable phosphor sheets are sequentially read as described above, the time required for the reading process will naturally increase, so this is not practical, especially during mass medical examinations. It was difficult to perform energy subtraction as described above.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a radiation image information recording/reading apparatus that can quickly perform the above-mentioned energy subtraction using a stimulable phosphor sheet.

(Means and effects for solving the problem) The radiation image information recording/reading device of the present invention uses two flexible band-shaped stimulable phosphor sheets as described above,
These two stimulable phosphor sheets are arranged parallel to each other, and a radiation energy conversion filter made of a copper plate or the like is placed between them, so that radiation image information in which specific structures differ from each other with one radiation exposure is obtained. is recorded on each of the two stimulable phosphor sheets, and an image reading unit reads the radiation image information accumulated and recorded on the stimulable phosphor sheets, and the remaining radiation image information on the stimulable phosphor sheets is recorded as described above. It is characterized in that an erasing section for erasing radiation images is provided for each of the two stimulable phosphor sheets, so that the two radiation image information can be read simultaneously in parallel. Specifically, a first stimulable phosphor sheet, and a first sheet that is stretched in a predetermined position and transported in the longitudinal direction of the sheet so as to be able to return to the stretched position. The feeding means, the second stimulable phosphor sheet, and the second stimulable phosphor sheet are stretched in parallel to the stretched first stimulable phosphor sheet. The second sheet is transported in the longitudinal direction so as to be able to return to the rack position.
a radiation energy conversion filter disposed between the stretched first and second stimulable phosphor sheets; and a radiation energy conversion filter disposed between the stretched first and second stimulable phosphor sheets. an image recording unit that accumulates and records radiographic image information on these sheets by irradiating radiation having image information; a first image reading unit that irradiates light and reads stimulated luminescence light emitted from the sheet by the excitation light irradiation using a photoelectric reading means, and obtains an image signal; and similarly, a second stimulable fluorescence a second image reading section that reads radiographic image information from the body sheet to obtain an image signal; and a second image reading section that reads radiation image information from the body sheet and obtains an image signal; do,
a first erasing section that releases the radiation energy remaining in the sheet; a second erasing section that similarly releases the radiation energy remaining in the second stimulable phosphor sheet; and a subtraction calculation unit that obtains an image signal for extracting a specific structure in the image information by subtracting each image signal obtained in the second image reading unit between the signals for pixels corresponding in phase. It is equipped with the following.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 shows a radiation image information recording/reading apparatus according to a first embodiment of the present invention. As an example, the apparatus of this embodiment includes a main body 20 and a radiation source storage section 30. As shown in the figure, a first winding shaft 22 and a second winding shaft 23 are arranged in parallel with each other with an interval between them within a casing 29 of the main body 20. These winding shafts 22.
23 are rotated in the directions of arrows A and B, respectively, by motors 24.25, which together with the shafts 22.23 and rollers 27.28, which will be described later, constitute a first sheet feeding means. One end of the first stimulable phosphor sheet 26 capable of storing and recording radiographic image information is wound around the first winding shaft 22, as described above. This first
The stimulable phosphor sheet 26 is formed into a long belt shape with an end using a flexible support, and the other end is held on the second winding shaft 23, and the stimulable phosphor sheet 26 is 2 It is adapted to be wound around a winding shaft 23.

Further, the first stimulable phosphor sheet 2B has both winding shafts 22
．． It is stretched between rollers 27 and 28 between 23 and 23. Note that here, the first stimulable phosphor sheet 26
In the figure, a flexible support through which radiation, which will be described later, can pass through satisfactorily is arranged at the upper side in the figure, and a stimulable phosphor layer carried on the support is located at the lower side.

A radiation energy conversion filter 90 made of a copper plate is placed below the first stimulable phosphor sheet 26 stretched in the manner described above in the figure, parallel to the sheet 26. Further below, a second stimulable phosphor sheet 26' is stretched in parallel with the stretched first stimulable phosphor sheet 26. This second
The stimulable phosphor sheet 2B' is similar to the first stimulable phosphor sheet 2B, and its one end and the other end are wound around the third winding axis at 22 degrees and the fourth winding axis at 23 degrees, respectively. times have been retained.

The third winding shaft 22' is rotated by a motor 24' in the same direction as the first winding shaft 22, and the fourth winding shaft 23' is rotated by a motor 25' in the same direction as the second winding shaft 23. It is now possible to do so. Further, the second stimulable phosphor sheet 26' is hung on rollers 27' and 28°, which together with the winding shafts 22° and 23' and the motors 24° and 25° constitute a second sheet feeding means. It is suspended in the position mentioned above.

A photographing stand 32 is provided at a position facing the first stimulable phosphor sheet 26 stretched between the rollers 27 and 28. The radiation source storage section 30 described above stores therein a radiation source 33 such as an X-ray tube, and this radiation source 33 faces the imaging table 32 .

When radiographically photographing a subject (subject) 34, the subject 34 is placed, for example, on his back on the imaging table 32, and the radiation source 33 is activated in this state. As a result, the radiation 35 that has passed through the subject 34 is irradiated onto the stretched first stimulable phosphor sheet 26, and the radiation 35 that has passed through the subject 34 is irradiated onto the stretched first stimulable phosphor sheet 26, and Radiation image information of the subject 34 is accumulated and recorded on the fluorescent phosphor layer. Also the first
The radiation 35 transmitted through the second stimulable phosphor sheet 26 is transmitted to the second stimulable phosphor sheet 26' which is also stretched.
Therefore, the radiation image information of the subject 34 is stored and recorded on the sheet 2B''.In this case, the radiation energy conversion filter described above is provided between the stimulable phosphor sheets 2B and 2B'. 90 is placed, so the first
Radiation image information is stored and recorded in the second stimulable phosphor sheet 26 by radiation including so-called soft lines, while in the second stimulable phosphor sheet 26' by radiation from which the soft lines are removed. As a result, these stimulable phosphor sheets 2
At 6.26°, a specific structure of the subject 34 is recorded in different states.

As is clear from the above description, in the apparatus of this embodiment, the image recording section 40 is composed of the imaging table 32 and the radiation source 33. Note that in this embodiment, the photographing table 32
A grid 91 for removing scattered radiation is arranged between the first stimulable phosphor sheet 2B and the first stimulable phosphor sheet 2B.

The radiation image information accumulated and recorded on the first stimulable phosphor sheet 2B and the second stimulable phosphor sheet 2B'' is converted into an electrical image signal by a first image reading section and a second image reading section, respectively. It is read as .

The first image reading section includes a laser light source 51. A light deflector 53 such as a polygon mirror that reflects and deflects the laser light 52 as excitation light emitted from the laser light source 51, and a first stimulable phosphor sheet 26 that reflects the deflected laser light 52.
A long mirror 59 is disposed between the mirror 59 and the optical deflector 53 for one-dimensional scanning on the stimulable phosphor layer (more specifically, on the stimulable phosphor layer) to direct the laser beam 52 to the sheet 2.
6, a scanning lens 58 that focuses the image on a small spot of a predetermined diameter at every scanning position on the phosphor sheet 6, and a motor that also serves as a winding means for the first stimulable phosphor sheet 26 and a sub-scanning means for conveying the sheet 26 at a constant speed. 24.25, Laser light 52
Scanning line (main scanning line) on the stimulable phosphor sheet 26
A long photomultiplier tube (photomultiplier) as a photoelectric reading means arranged so that the light-receiving surface extends along the
54, and a long light guide 55 and laser beam 52 optically coupled to the light receiving surface of the long photomultiplier tube 54.
It consists of a filter (not shown) that prevents the photomultiplier from entering the photomultiplier 54. After the radiation image information of the subject 34 is accumulated and recorded on the first stimulable phosphor sheet 26 as described above, the sheet 26 is moved leftward in the figure at a constant speed by rotating the motor 25. transported. At this time, the stimulable phosphor sheet 26 is wound around the shaft 23. Further, an appropriate load is applied to the first winding shaft 22 side by a known means, so that the stimulable phosphor sheet 26
always maintains a tense state. While the sheet 2B is conveyed, the laser light source 51 and the optical deflector 53 are activated, and the laser beam 52 scans the sheet 26. Stimulated luminescence light 56 carrying radiation image information stored and recorded on the sheet 26 is emitted from the portion of the stimulable phosphor sheet 2B that is irradiated with the laser beam 52. This stimulated luminescence light 5B is guided by a light guide 55 and efficiently detected by a long photomultiplier tube 54. The main scanning of the laser beam 52 is performed as described above, and the stimulable phosphor sheet 26 is conveyed as described above and sub-scanning is performed, so that the stimulated luminescent light is emitted two-dimensionally from the sheet 26. 56 (ie, radiation image information) is read. The output Sl of the long photomultiplier tube 54 is sent to a reading circuit 57.

On the other hand, the second image reading section reads the second stimulable phosphor sheet 2.
Read the radiation image information recorded at 6°. Each element constituting the second image reading section is basically the same as that in the first image reading section described above, so in FIG. "
``'' (dash) is added and the explanation thereof is omitted. The output Sz of the elongated photomultiplier tube 54° of the second image reading unit (that is, the information indicating the radiation image recorded on the second stimulable phosphor sheet 26°) is also sent to the reading circuit 57. It will be done. The long photomultiplier tube is described in detail in, for example, Japanese Patent Laid-Open No. 16666/1983.

Next, the processing in the five reading circuits will be explained with reference to FIG. 2, which schematically shows the configuration thereof. Long photomultiplier tube 5
4 is logarithmically amplified by a logarithmic amplifier 80 and then digitized by an A/D converter 81. The digital read image signal 10g5l thus obtained is temporarily stored in the frame memory 82, and then read out from there and input to the subtraction calculation circuit 83. Similarly, the output S2 of the long photomultiplier tube 54' is logarithmically amplified by a logarithmic amplifier 84 and then digitized by an A/D converter 85. The digital read image signal +ogsz thus obtained is also temporarily stored in the frame memory 86, and then read out from there and input to the subtraction calculation circuit 83.

The subtraction calculation circuit 83 subjects the two input image signals 1ogs1 and logsz to appropriate weighting and subtracts them for each corresponding pixel to generate a digital difference signal 5sub-a 1110gsl-b*log
sz -c [a-b are weighting coefficients, C is a bias component]. After this difference signal Ssub undergoes image processing such as gradation processing and frequency processing in the image processing circuit 87,
It is sent to an image reproducing device 88 outside the recording/reading device and used for reproducing the radiation image. This playback device 88 is a CRT
It may be a display means such as, a recording device that performs optical scanning recording on a photosensitive film, or it may be replaced with a device that temporarily stores the image signal in an image file such as an optical disk or a magnetic disk. .

When performing the above-mentioned subtraction operation, the coefficient a
, b are appropriately determined, signal components for portions other than the specific structure are eliminated in the obtained difference signal Ssub. Therefore, this difference signal S s
By performing image reproduction based on ub, it is possible to obtain a radiation image in which only the above-mentioned specific structure is extracted. When performing this subtraction operation, it is necessary to perform subtraction between corresponding pixels as described above. To do this, for example, as shown in FIG. 1, a marker 92 is placed near the subject 34, and both image signals logS1
, logsz, positioning may be performed using a signal indicating this marker 92 as a reference signal.

Note that it is also possible to reproduce a normal radiographic image based on the read image signal 1ogs1 or logsz without specifically sending the read image signal 1ogs1 or logsz to the subtraction calculation circuit 83, and for this purpose, these image signals 1ogS1 'i logsz may be recorded and accumulated in an image file such as an optical disc.

The portion of the first stimulable phosphor sheet 2B whose image has been read as described above is wound around the second winding shaft 23 and stored there. At the same time, the first winding shaft 22
Another part of the first stimulable phosphor sheet 26 that had been wound around the rollers 27 and 28 is now stretched between the rollers 27 and 28, so this part of the stimulable phosphor sheet 2B is wrapped in the same manner as described above. Radiographic image information can be recorded. In this way, radiation image information is recorded over substantially the entire length of the first stimulable phosphor sheet 26, and all of the sheets 26 that had been wound and stored on the first winding shaft 22 are transferred to the second winding shaft 23.
When it is sent out to the side, the motor 24 is driven and the first winding shaft 22 is rotated in the direction of arrow A. As a result, all of the stimulable phosphor sheet 26 that was wound around the second winding shaft 23 after the image reading is completed is transferred to the first winding shaft 23.
At this time, the first stimulable phosphor sheet 26 passes through a first erasing unit 60 disposed near the roller 27, and the sheet 26 undergoes image (afterimage) erasure. The erasing unit 60 includes, for example, an erasing light source 61 disposed below the stretched sheet 26. This erasing light source 61 is composed of, for example, a fluorescent lamp, and mainly emits light in the excitation wavelength range of the stimulable phosphor of the sheet 26, and is turned on when the sheet 26 is returned to the first winding shaft 22 side. be done. After reading the image, the first stimulable phosphor sheet 2
The radiation energy remaining in the sheet 26 is emitted from the sheet 26 by irradiating the sheet with the light as described above.

The sheet rewinding and erasing processes described above are performed on the second stimulable phosphor sheet 26' in exactly the same manner. However, the second erasing unit 60° that performs the erasing process on the stimulable phosphor sheet 26° uses a large number of erasing light sources 61' located below the stretched sheet 26°.
It consists of

In this way, the first winding shaft 22 and the third winding shaft 2
2° are stored with stimulable phosphor sheets 26 and 26° whose images (afterimages) have been erased to the extent that radiation image information can be recorded again.
．． It becomes possible to repeat the above-described image recording (photographing) and reading using 26°. In addition, erasing light source 61.61
' In addition to the above-mentioned fluorescent lamps, for example, JP-A-56-
A tungsten lamp, a halogen lamp, an infrared lamp, a xenon flash lamp, etc. as shown in No. 11392 may be optionally selected and used. Also, the erasing section 60.60
In addition to the above-mentioned erasing light source, for example, the
The light source may be composed of a planar light source such as a panel in which D1odes are arranged two-dimensionally or an EL (electroluminescence) board.

In the above, a case has been described in which the radiation image information is stored and recorded on the stimulable phosphor sheet 26, 26' and then immediately read by the image reading unit. It can also be used so that many image recordings (photographs) are performed one after the other, with the image recording being postponed. In other words, in this case, all of the stimulable phosphor sheets 26 and 26' on which the image has been recorded are placed on the second winding shaft 23 and the fourth winding shaft 23, respectively.
', and after a series of image recording is completed, the sheet 26. 26'
, and at that time, the image reading section may read the image.

Next, a second embodiment of the present invention will be described with reference to FIG. Note that in FIG. 3, elements equivalent to those in FIG. 1 are given the same numbers, and explanations thereof will be omitted unless particularly necessary. In the apparatus shown in FIG. 3, the second stimulable phosphor sheet 1
26 is shaped like an endless belt, and a pair of rollers 122
．． 123, and the drive roller 123 is rotated by a motor 25°, so that the image is sequentially sent to an image recording section, an image reading section, and an erasing section. In this example, the stimulable phosphor sheet 126 is formed by providing a stimulable phosphor layer on the outside of an endless belt-like support, and the laser beam 52' as excitation light is irradiated onto the outside of the sheet 12B. Ru.

In this example, the second stimulable phosphor sheet 1
Since the erasing light source 61' is disposed inside the sheet 2B, the sheet 126 is formed using a transparent support so that the stimulable phosphor layer can be irradiated with the erasing light. Further, in this embodiment, the second stimulable phosphor sheet 126
are always transported in the same direction, so
The erasing light source 81' is turned on, for example, when the image recording portion of the sheet 126 is fed into the image recording section 40.

Note that, contrary to the above second embodiment, it is also possible to form the first stimulable phosphor sheet in the form of a relatively large endless belt, and arrange the second stimulable phosphor sheet in the form of a belt with ends inside it. Furthermore, a second stimulable phosphor sheet in the form of an endless belt can be placed inside the first stimulable phosphor sheet in the form of an endless belt.

(Effects of the Invention) As explained in detail above, in the radiation image information recording/reading device of the present invention, radiation image information for subtraction can be simultaneously recorded (photographed) on the strip-shaped first and second stimulable phosphor sheets. In addition, each stimulable phosphor sheet is provided with an image reading section so that the radiation image information accumulated and recorded on each sheet can be read in parallel, so this device can quickly perform subtraction. This makes it possible to significantly improve diagnostic work efficiency, especially in group medical examinations and the like.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing a first embodiment of the present invention; FIG. 2 is a block diagram showing the configuration of a radiation image information reading circuit of the above embodiment; FIG. 3 is a second embodiment of the present invention. FIG. 2 is a schematic side view showing the device. 20... Main body 22... First winding shaft 22'... Third winding shaft 23... Second winding shaft 23''... Fourth winding shaft 24.24°, 25. 25°...Motor 26...
- First stimulable phosphor sheet 2B', 12B... second stimulable phosphor sheet 27
．． 27°...Roller 28.28゛・
...Drive roller 30...Radiation source storage section 32.
...Photographing table 33...Radiation source 34...
Subject 35...Radiation 40...Image recording unit 51.51゛...Laser light source 52.52
°...Laser light 53.53゛...Light deflector 54.54°...Photomultiplier tube 56.56'...Stimulated luminescence light 57...Reading circuit 60.60゛...・Erasing part 81.61°...
・Erasing light source 80.84...Logarithmic amplifier 81.8
5... A/D converter 82.86... Frame memory 83... Subtraction calculation circuit 90... Radiation energy conversion filter 122...
...Roller 123...Drive roller 1og
s1, +ogs2...read image signal S sub...
・Difference signal

Claims (3)

[Claims] (1) A flexible first stimulable phosphor sheet capable of storing and recording radiographic image information, and a stretched first stimulable phosphor sheet at a predetermined position. a first sheet feeding means for transporting the sheet in the longitudinal direction so as to be able to recover freely; a second stimulable phosphor sheet having flexibility capable of storing and recording radiographic image information; and the second stimulable phosphor sheet. A second stimulable phosphor sheet is stretched in parallel with the stretched first stimulable phosphor sheet and transported in the longitudinal direction of the sheet so as to be able to return to the stretched position.
a radiation energy conversion filter disposed between the stretched first and second stimulable phosphor sheets; and a radiation energy conversion filter disposed between the stretched first and second stimulable phosphor sheets. an image recording unit that accumulates and records radiographic image information on these sheets by irradiating radiation having image information; and excitation light irradiation means on the first sheet after the radiographic image information has been accumulated and recorded. a first image reading unit that obtains an image signal by irradiating excitation light from the sheet and reading stimulated luminescence light emitted from the sheet by the excitation light irradiation using a photoelectric reading means; and the radiation image information is stored and recorded. A second image reading step in which the second sheet is irradiated with excitation light from an excitation light irradiation means, and stimulated luminescence light emitted from the sheet by the irradiation with the excitation light is read by a photoelectric reading means to obtain an image signal. and prior to recording the image on the first sheet after the image is read in the first image reading section,
a first erasing section that releases radiation energy remaining on the sheet; and prior to recording an image on the second sheet after the image is read in the second image reading section;
a second erasing unit that releases radiation energy remaining in the sheet; and subtracting each image signal obtained in the first and second image reading units between the signals for corresponding pixels, and A radiation image information recording/reading device comprising a subtraction calculation unit that obtains an image signal for extracting a specific structure in image information. (2) The first and/or second stimulable phosphor sheet is formed into a belt shape with ends, and the first and/or second sheet feeding means for transporting the stimulable phosphor sheet is configured to Wind up one end of the sheet and the other end 2
2. The radiation image information recording/reading apparatus according to claim 1, further comprising two winding shafts. (3) The first and/or second stimulable phosphor sheet is formed into an endless belt shape, and the first and/or second sheet feeding means for transporting the stimulable phosphor sheet is configured to transport the stimulable phosphor sheet. 2. The radiation image information recording/reading apparatus according to claim 1, further comprising a plurality of rollers for stretching the image in a ring shape.