JPH0614233B2 - Radiation image information recording / reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, radiation image information is accumulated and recorded on a stimulable phosphor, and then excitation light is irradiated to this to detect photostimulated light according to the accumulated and recorded image information. The present invention relates to a radiation image information recording / reading device for reading image information and converting it into an electric signal, and more particularly to a radiation image recording / reading device in which a stimulable phosphor is repeatedly reused in the device.

When a certain kind of phosphor is irradiated with radiation (X-rays, α-rays, β-rays, γ-rays, ultraviolet rays, etc.), a part of the energy of this radiation is accumulated in the phosphor, and then the phosphor is irradiated. When excitation light such as visible light is irradiated on the phosphor, the phosphor emits stimulated emission depending on the accumulated energy. A phosphor exhibiting such a property is called a stimulable phosphor.

Using this stimulable phosphor, the radiation image information of the human body etc. is once recorded on the sheet of the stimulable phosphor, and this is scanned with excitation light to cause stimulated emission, and this stimulated emission light is photoelectrically converted. A method has been proposed in which the image signal is read out to obtain an image signal, and the image signal is processed to obtain an image having a good diagnostic suitability (for example, JP-A-55).
-12429, 56-11395, 55-163472, 56-104645
No. 55-116340 etc.). This final image line may be reproduced as a hard copy or may be reproduced on a CRT. In any case, in such a radiographic image information recording / reproducing method, the stimulable phosphor sheet does not finally record image information, and the image is temporarily transferred to give an image to the final recording medium as described above. Since it carries information, the stimulable phosphor sheet may be used repeatedly, and if it is used repeatedly in this way, it is extremely economical.

To reuse the stimulable phosphor sheet as described above, the radiation energy accumulated in the stimulable phosphor sheet after the stimulated emission light is read, for example, JP-A-56-11392, 56
The radiation image may be erased by the method described in US Pat. No. 12,599, and the stimulable phosphor sheet may be used again for recording the radiation image. In an actual device, the accumulative phosphor sheet after completion of reading is supplied to the image erasing device by a conveying means such as a belt conveyor,
Here, it is possible to save labor by returning the stimulable phosphor sheet from which the radiation image has been erased to the image recording section by using the above-mentioned conveying means.

However, it is extremely difficult to design and manufacture a transporting means capable of transporting a sheet-like substance such as the above-mentioned accumulative phosphor sheet without causing troubles such as clogging and catching. Furthermore, it is needless to say that the above-mentioned accumulative phosphor sheet should not be damaged during transportation, such as scratches, and this also makes the design and manufacture of the above-mentioned transportation means difficult. Also, for example, if a certain sheet is reproduced immediately after recording, a certain sheet is once stored and then collectively reproduced with another series of sheets, the order of use of the sheets is completely reduced. Sheets returned to the image recording section become unequal, and gradually new and old sheets are mixed together. When new sheets and old sheets are mixed in this way, the image quality of the reproduced image varies depending on the sheets used, and it becomes impossible to obtain a uniform reproduced image. Therefore, it is desirable to replace old sheets with new ones as needed. In order to perform such sheet replacement, the quality of the reproduced image of each sheet is inspected or the number of times of use is controlled. However, it is then necessary to decide whether to replace the seat with a new one or to continue using it.
In this way, quality control of each sheet is extremely troublesome.

In addition, for example, when a moving station such as an X-ray radiographing machine is equipped with such a recording / reading device for radiographic image information and traveling to various places for group examination to take X-ray radiographs, Because the amount of recording material that can be loaded in is limited,
Instead of loading a large number of sheets or panels of storage phosphors with a relatively large size (for example, the size of a conventional X-ray film cassette) into multiple vehicles, a storage phosphor sheet that can be used repeatedly is installed. Then, the image signals recorded and read out for each subject are transferred to a recording medium with a large storage capacity such as a magnetic tape, and the accumulative phosphor sheet is reused. It is extremely useful in practical use because it can be photographed.

In particular, a reusable recording body made of a stimulable phosphor, an image recording section that irradiates the recording body with radiation through a subject,
An image reading unit that reads an image stored and recorded on this recording medium,
Also, if the elements that compose this device, such as the erasing means for releasing the radiation energy remaining in the recording medium after reading and preparing for the next recording, are compacted into one device, this can be mounted on a mobile vehicle for medical examination. It will be easy to visit, and it will be easy to install in a hospital, etc., which is practically convenient.

The present invention has been made in view of such circumstances,
Provided is a radiation image information recording / reading device capable of reusing a stimulable phosphor that records a radiation image, easily obtaining a uniform reproduced image repeatedly, and easy to design, manufacture, manage and move. The purpose is to do.

A radiographic image information recording and acquiring apparatus according to a first invention of the present application comprises a support and a stimulable phosphor layer capable of accumulating and recording a radiographic image, which is provided on the surface of the support, and is provided at a fixed position. An installed flat plate-shaped recording body, and a radiation source installed on one surface side of the recording body,
An image recording unit that accumulates and records a radiation transmission image of the subject on the recording medium by irradiating the flat recording medium with radiation from the radiation source through the subject, and a recording body on which the radiation image is accumulated and recorded. An excitation light source that emits excitation light for scanning, and a photoelectric reading unit that obtains an image signal by reading the stimulated emission light emitted from the recording medium scanned by this excitation light, and the other surface side of the recording medium. An image reading unit installed in the image reading unit, and a reciprocating unit that linearly reciprocates the image continuous unit with respect to the recording medium in a direction parallel to the recording medium to enable repeated image reading by the image reading unit. A moving means and an erasing means for releasing the residual radiation energy on the recording medium before the image is recorded on the recording medium after the image is read by the image reading section. And butterflies.

A radiographic image information recording / reading apparatus according to a second aspect of the present application is a flat plate-shaped device including a support and a stimulable phosphor layer provided on the surface of the support for accumulating and recording a radiographic image. A recording body having a radiation source installed on one side of the recording body,
An image recording unit that accumulates and records a radiation transmission image of the subject on the recording medium by irradiating the flat recording medium with radiation from the radiation source through the subject, and a recording body on which the radiation image is accumulated and recorded. An excitation light source that emits excitation light for scanning, and a photoelectric reading unit that obtains an image signal by reading the stimulated emission light emitted from the recording material rescanned by this excitation light, have the other of the recording material. An image reading unit installed at a fixed position on the surface side, wherein the recording medium is linearly reciprocated in a direction parallel to the recording unit with respect to the image reading unit, and image reading by the image reading unit is repeated. From the erasing means for enabling the reciprocating movement means and the erasing means for releasing the residual radiation energy on the recording medium prior to the image recording being performed on the recording medium after the image reading is performed in the image reading section. And wherein the Rukoto.

The apparatus of the present invention performs a reading operation and subsequent erasing. The image signal obtained by the reading operation may be temporarily stored in a storage medium such as a magnetic tape or a magnetic disk, or a CRT or the like. It may be displayed on the display and observed immediately, or may be made into a hard copy for permanent recording. The playback device for this purpose may be directly connected to the above device, may be played back at a distance via a storage device, or may be placed at a remote place to receive a signal wirelessly. Alternatively, it may be reproduced. In this way, for example, an image taken by a mobile vehicle can be reproduced by a receiver / reproducer of a hospital, and a specialist can observe the image and wirelessly report the diagnosis result to the mobile vehicle. In the radiation image information recording / reading apparatus of the present invention having the above-mentioned configuration, the recording body for recording the radiation image is recorded, read, and erased in the apparatus, and is repeatedly used. There is no need to handle the recording medium, the complexity of handling the recording medium is eliminated, there is no risk of damage to the recording medium due to the handling, and the operation and movement of the device are easy, making it practically easy to use.

Further, since one recording medium is repeatedly used, if the quality of the reproduced image deteriorates, the recording medium in use may be replaced with a new recording medium, and the quality control of the recording medium is extremely easy. Further, since one recording medium is repeatedly used, there is no instability in quality due to variations in characteristics of each recording medium, and it is possible to always obtain an image of constant image quality.

Further, since the recording medium is flat and image recording is performed on this flat recording medium, image recording can be easily and accurately performed without distortion.

Further, the number of recording bodies is one, and since it is only necessary to linearly reciprocate the one recording body or the image reading unit in parallel with the recording body, the mechanism and space for the movement may be small, and the recording body Since the image recording unit is provided on one surface side and the image reading unit is provided on the other surface side, the degree of freedom in the arrangement of them and the above-mentioned moving mechanism is great, and the entire apparatus is made extremely compact in order to effectively utilize the space. can do.

Further, since one recording medium can be repeatedly used for recording, a large number of continuous shootings can be easily performed without preparing a large number of recording mediums, and the user needs to handle the recording mediums as described above. Since it is easy to operate and the apparatus is extremely compact as a whole, it is optimal as an apparatus to be used, for example, in a case where a group medical examination is carried out on an X-ray radiographing vehicle at a remote place.

In the present invention, a stimulable phosphor means a radiation (X-ray, α
Radiation, β-rays, γ-rays, ultraviolet rays, etc.), some of this radiation energy is accumulated inside, and when excitation light such as visible light is then irradiated, the amount of stimulated emission of light in accordance with the accumulated energy is emitted. It has the property of emitting light.

In the present invention, it is preferable that the wavelength region of the excitation light and the wavelength region of the stimulated emission light do not overlap in order to improve the S / N ratio, and the excitation light source and the stimulable fluorescein so as to satisfy such a relationship. It is preferable to select the light body. Specifically, the excitation light wavelength is 450 to 700 nm, and the stimulated emission light wavelength is 30
It is desirable to set it to 0 to 500 nm.

Thus, as a stimulable phosphor that emits stimulated emission light of 300 to 500 nm and can be preferably used in the present invention, for example, a rare earth element activated alkaline earth metal fluorohalide phosphor (specifically, are described in _{JP-a-55-12143 (Ba 1-x-y} , Mg x, Ca y) FX: aE
u ²⁺ (where X is at least one of Cl and Br, and x and y are 0 <x + y ≦ 0.6 and xy ≠ 0.
And a is 10 ⁻⁶ ≦ a ≦ 5 × 10 ⁻² ), −
It is described in JP-A-55-12145 (Ba _1-x , M
^II _x ) FX: yA (where M ^II is Mg, Ca, Sr, Z
at least one of n and Cd, X is at least one of Cl, Br and one, A is Eu, Tb, C
At least one of e, Tm, Dy, Pr, Ho, Nd, Yb and Er, x is 0 ≦ x ≦ 0.6, y is 0 ≦
y ≦ 0.2), etc.]; ZnS: Cu, Pb, BaO.xAl described in JP-A-55-12142
₂ O ₃ : Eu (however 0.8 ≦ x ≦ 10) and M _II O ·
xSiO ₂ : A (however, M ^II is Mg, Ca, Sr, Zn,
Cd or Ba, A is Ce, Tb, Eu, Tm,
Pb, Tl, Bi or Mn, and x is 0.5 ≦ x ≦
2.5)) and LnOX: xA described in JP-A-55-12144 (where Ln is at least one of LA, Y, Gd and Lu, and X is Cl and Br). At least one, A is at least one of Ce and Tb, and x is 0 <x <0.1.); And the like. Among these, rare earth element activated alkaline earth metal fluorohalide phosphors are preferable, and among them, barium fluorohalides shown as specific examples are particularly preferable because they have excellent stimulable emission.

Furthermore, a barium fluorohalide phosphor is disclosed in Japanese Patent Laid-Open No. 56-2.
No. 385 and No. 56-2386, those added with a metal fluoride, or metal chlorides, metal bromides, and metal iodides as disclosed in Japanese Patent Application No. 54-150873. The addition of at least one is preferable because the stimulated emission is further improved.

Also, as disclosed in JP-A-55-163500, when the phosphor layer of the stimulable phosphor plate prepared by using the stimulable phosphor as described above is colored with a pigment or a dye, The sharpness of the finally obtained image is improved, which is preferable.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the first invention of the present application.
In the present embodiment, one flat plate-shaped recording member 703 in which a stimulable phosphor layer 702 is laminated on the surface of a support 701 placed at a fixed position made of a flat plate-shaped radiation transmitting material is used to store a radiation image. Used for recording. A radiation source 704 is provided at a position facing the support-side surface of the recording member 703. The radiation source 704 is, for example, an X-ray source, and a transmission radiation image of a subject 705 arranged between the radiation source 704 and the recording member 703 is passed through a support 701 made of a radiation transmitting material and a stimulable phosphor layer 702. Project on top. The projected radiographic image is stored and recorded on the storage phosphor layer 702. At a position facing the surface of the recording member 703 facing the fluorescent body, an excitation light source 706 that emits excitation light such as laser light and the excitation light source 7 are provided.
An optical deflector 707 such as a galvanometer mirror that scans the excitation light emitted from 06 in the width direction of the recording member 703,
A photodetector 708 for reading the stimulated emission light emitted from the stimulable phosphor layer 702 excited by the excitation light, and a light transmission means 709 for guiding the stimulated emission light to the photodetector 708 are common stages (Fig. (Not shown). The photodetector 708 is, for example, a head-on type photomultiplier tube, a photoelectron amplification channel plate, or the like.
The stimulated emission light introduced by 9 is detected photoelectrically.

Regarding the material and structure of the light transmitting means 709 or how to use it, JP-A-55-87970, JP-A-56-11397, JP-A-56-11396,
The methods and methods disclosed in Nos. 56-11394, 56-11398, and 56-11395 can be used as they are. An erasing light source 7 is provided at a position facing the surface of the recording member 703 on the fluorescent body side.
10 is provided, and a cylindrical cleaning roller 711 that is rotated in the direction of the arrow in the drawing by a driving device (not shown) is mounted on the stage described above. The erasing light source 710 emits radiation energy stored in the stimulable phosphor layer 702 by irradiating the stimulable phosphor layer 702 with light included in the excitation wavelength region of the phosphor. For example, in the same manner as described above, JP-A-56-11392
A tungsten lamp, a halogen lamp, an infrared lamp, a laser light source, or the like, as shown in the above item, can be optionally used. The radiation energy stored in the stimulable phosphor layer 702 can be released by heating the stimulable phosphor, as disclosed in, for example, JP-A-56-12599. The erasing light source 710 may be replaced with heating means. Cleaning roller 71
The reference numeral 1 is a fluorescent substance that removes dust and dirt adhering to the surface of the stimulable fluorescent substance layer 702 of the recording member 703 when the recording member 703 is moved while rotating on the recording member 703. It is to be removed from the surface, and if necessary, it may be formed into a material that adsorbs the above-mentioned dust and dirt by utilizing an electrostatic phenomenon.

As described below, the stage is capable of linear reciprocating movement in the vertical direction in the figure, that is, in the direction parallel to the recording member 703 with respect to the flat plate-shaped recording member 703, whereby the excitation light source 706 on the stage is moved. An image reading unit including a light deflector 707, a photodetector 708, and a light transmitting unit 709, and the cleaning roller 711 are provided on the recording member 703 with respect to the recording member 703.
It can be reciprocated linearly in the direction parallel to.

The operation of the apparatus of this embodiment having the above structure will be described below. When the radiation source 704 is turned on after the subject 705 is arranged between the recording member 703 and the radiation source 704, the recording member 7
A transmission radiation image of the subject 705 is stored and recorded on the storage phosphor layer 702 of 03. Excitation light source 70 after completion of radiation image recording
6 is turned on and the accumulative phosphor layer 702 is scanned by the excitation light emitted from the excitation light source 706. The excitation light is scanned by the optical deflector 707 in the width direction of the recording member 703 (main scanning), and at the same time, the excitation light source 706, the optical deflector 707, and the photodetector 70.
8. The recording member 703 is vertically scanned (sub-scanning) by moving the stage for fixing the light transmitting unit 709 and the cleaning roller 711 from the upper side to the lower side in the drawing.
The stage that moves as described above can be easily formed by using a known linear movement mechanism. Upon receiving the irradiation of the excitation light, the stimulable phosphor layer 702 emits stimulated emission according to the image information stored and recorded. The stimulated emission light is input to the photodetector 708 via the light transmitting means 709 and photoelectrically converted, and the photodetector 708 outputs an electrical image signal corresponding to the image information. When the stage is moved from the upper side to the lower side for the sub scanning, the cleaning roller 711 mounted on the stage is rotated. This moving cleaning roller 711 allows the stimulable phosphor layer 7
The surface of 02 is wiped off, and fine dust and dirt are removed from the surface. When the image reading is completed and the entire surface of the stimulable phosphor layer 702 is cleaned, the optical deflector 70
7. The stage equipped with the photodetector 708 is a recording member 703.
Is returned to the standby position, which is displaced upward in the figure. afterwards,
When the erasing light source 710 is turned on for a predetermined time, the stimulable phosphor layer 7
The radiation energy remaining after the reading operation in 02 and the radiation energy emitted from radioactive isotopes such as ²⁶⁶ Ra and ⁴⁰ K that are mixed in a trace amount in the stimulable phosphor or the radiation energy caused by environmental radiation are emitted. To be done. Therefore, it was formed on the stimulable phosphor layer 702 by this radiation image recording. The radiation image after reading is erased, and when the device has not been used for a long time until then, radiation from the radioactive isotope accumulated in the stimulable phosphor layer 702 or environmental radiation. Radiation energy due to is also released and returned to a reusable state. The recording member 703 that has been cleaned and image-erased as described above is used again for recording a radiation image.

The electric image signal output from the photodetector 708 may be immediately input to a reproducing device to obtain a hard copy or a CRT display, or it may be digitized to be a magnetic tape, a magnetic disk, or an optical disk. Alternatively, the data may be temporarily recorded in a high-density recording medium such as the above, and then applied to the reproducing device. When the radiation image recording / reading device is used for medical diagnostic imaging by being mounted on a circulating bus, for example, the image signal reading and recording are performed at the radiation imaging site, and high-density recording as described above is performed. If the medium is brought back to a medical center or the like and is reproduced there, the weight of the mobile device can be reduced. Also,
The above image signals may be input to the reproducing device and the recording medium at the same time. That is, when used in a hospital, the image signal is transmitted from the radiation imaging room to the recording medium for record storage, and at the same time, the image signal is transmitted to the CRT in the examination room.
It may be transmitted to a reproducing device such as the above and used for diagnosis immediately after photographing.

In addition, prior to reproducing the radiographic image, signal processing may be performed on the image signal to enhance the image, change the contrast, or the like, and in order to obtain a radiographic image with excellent diagnostic performance, It is desirable to perform signal processing. Desirable signal processing used in the present invention includes JP-A-55-87970, JP-A-56-11038, and JP-A-56-75137.
No. 56-75139, No. 56-75141, No. 56-104645, etc., disclosed frequency processing, JP-A-55-116339, No. 55-
Examples include gradation processing disclosed in 116340 and 55-88740.

The recording state or recording pattern of the radiation image information accumulated and recorded on the accumulative phosphor sheet is grasped prior to the reading operation, and the reading gain of the photoelectric reading means is set, the appropriate recording scale factor is determined, and the signal is recorded. It is preferable to set the processing conditions in order to obtain a radiographic image with excellent diagnostic performance. For this reason, the recording state or recording pattern of radiographic image information is read with low excitation light energy prior to the reading operation (hereinafter, referred to as “ Look ahead. ")
Thereafter, a method and apparatus for performing a reading operation (hereinafter referred to as "main reading") for obtaining a radiation image used for diagnosis are disclosed in Japanese Patent Application Nos. 56-165111, 56-165112, and 56-165113.
No. 56-165114, No. 56-165115. In the present invention as well, by separately providing a pre-reading reading unit having the same configuration on the upstream side of the image continuation unit, or by using the image continuation unit for pre-reading and main reading, the pre-reading is performed. Can fulfill the demands of doing.

In the embodiment of the first invention described above, in the sub-scanning for reading the radiation image, the image reading section including the excitation light irradiation system and the stimulating light reading system is moved with respect to the fixed recording member 703. However, it is also possible to fix the image reading section consisting of the excitation light irradiation system and the stimulated emission emission reading system to the image reading zone, and perform the sub scanning by moving the recording member. In the embodiment of the second invention shown in FIG. 2, the sub-scanning method of moving the recording member as described above is used. In this embodiment, as in the first embodiment of the invention, a stimulable phosphor layer 802 is formed on a flat support 801 made of a radiation transmitting material.
A single flat plate-shaped recording member 803 is used. Then, the radiation reduction 804, the excitation light source 806, the optical deflector 807, and the photodetector 80 which are the same as those in the embodiment of the first invention are
8, a light transmitting means 809, an erasing light source 810, and a cleaning roller 811 are provided, but unlike the embodiment of the first invention, the excitation light source 806, the light deflector 807, the light detector 808,
The image reading unit including the light transmitting unit 809 is fixed and does not move. Both side edges of the recording member 803 are housed in a groove portion 813 at the center of two rails 812 extending in the vertical direction in the drawing, and the recording member 803 extends in the vertical direction in the drawing along the rails 812. That is, the recording member 80 with respect to the image reading unit
It is possible to move straight back and forth in the direction parallel to 3. The recording member 803 is moved in the vertical direction in the figure by a linear movement device (not shown) such as a rack and pinion mechanism. After the transmission radiation image of the subject 805 is recorded by the radiation source 804, excitation light is irradiated to read the radiation image. At this time, the main scanning is performed by the optical deflector 807 as in the first embodiment of the invention, but the sub-scanning is performed by moving the recording member 803 from the lower side to the upper side in the drawing by the linear moving device. It is done by When the recording member 803 moves, the rotating cleaning roller 811 contacts the recording member 803, and the recording member 803 is cleaned. After the image reading is completed, the recording member 803
After being returned to the lower side, the erasing light source 810 is turned on to erase the read radiation image.

In the embodiments described above, the stimulable phosphor is laminated on a support made of a radiation transmitting material, and is arranged on the opposite side of the support from the radiation source. When is transparent to excitation light and stimulated emission, a radiation source may be provided at a position facing the surface on the side of the phosphor and a reader may be placed at a position facing the surface on the side of the support.

In the radiation image information recording / reading apparatus of the present invention having the above-mentioned configuration, the recording body for recording the radiation image is recorded, read, and erased in the apparatus, and is repeatedly used. There is no need to handle the recording medium, the complexity of handling the recording medium is eliminated, there is no risk of damage to the recording medium due to the handling, and the operation and movement of the device are easy, making it practically easy to use.

Further, since one recording medium is repeatedly used, if the quality of the reproduced image deteriorates, the recording medium in use may be replaced with a new recording medium, and the quality control of the recording medium is extremely easy. Further, since one recording medium is repeatedly used, there is no instability in quality due to variations in characteristics of each recording medium, and it is possible to always obtain an image of constant image quality.

Further, since the recording medium is flat and image recording is performed on this flat recording medium, image recording can be easily and accurately performed without distortion.

Further, the number of recording bodies is one, and since it is only necessary to linearly reciprocate the one recording body or the image reading unit in parallel with the recording body, the mechanism and space for the movement may be small, and the recording body Since the image recording unit is provided on one surface side and the surface image reading unit is provided on the other surface side, the degree of freedom in the arrangement of them and the above-mentioned moving mechanism is great, and the entire apparatus is made extremely compact by effectively utilizing the space. Can be configured.

Further, since one recording medium can be repeatedly used for recording, a large number of continuous shootings can be easily performed without preparing a large number of recording mediums, and the user needs to handle the recording mediums as described above. Since it is easy to operate and the apparatus is extremely compact as a whole, it is optimal as an apparatus to be used, for example, in a case where a group medical examination is carried out on an X-ray radiographing vehicle at a remote place.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the first invention of the present application, and FIG.
The drawing is a schematic view showing an embodiment of the second invention of the present application. 701, 801 ... Support 702, 802 ... Storage phosphor layer 703, 803 ... Recording member 704, 804 ... Radiation source 705, 805 ... Subject 706, 806 ... Excitation light source 707, 807 ... Optical deflector 708, 808 Photodetector 709, 809 Optical transmission means 710, 810 Erasing light source

Claims (2)

[Claims] 1. A flat plate-shaped recording medium comprising a support and a stimulable phosphor layer provided on the surface of the support for accumulating and recording a radiation image, the plate-like recording medium being installed at a fixed position. It has a radiation source installed on one side of this recording body,
An image recording unit that accumulates and records a radiation transmission image of the subject on the recording medium by irradiating the flat recording medium with radiation from the radiation source through the subject, and a recording body on which the radiation image is accumulated and recorded. An excitation light source that emits excitation light for scanning, and a photoelectric reading unit that obtains an image signal by reading the stimulated emission light emitted from the recording medium scanned by this excitation light, and the other surface side of the recording medium. An image reading unit installed in the image reading unit, and a reciprocating unit that linearly reciprocates the image continuous unit with respect to the recording medium in a direction parallel to the recording medium to enable repeated image reading by the image reading unit. A moving means and an erasing means for releasing the residual radiation energy on the recording medium before the image is recorded on the recording medium after the image is read by the image reading section. Radiation image information recording and reading apparatus according to symptoms. 2. A flat plate-shaped recording medium comprising a support and a stimulable phosphor layer provided on the surface of the support for accumulating and recording a radiation image, and one surface of the recording medium. Has a radiation source installed on the side,
An image recording unit that accumulates and records a radiation transmission image of the subject on the recording medium by irradiating the flat recording medium with radiation from the radiation source through the subject, and a recording body on which the radiation image is accumulated and recorded. An excitation light source that emits excitation light for scanning, and a photoelectric reading unit that obtains an image signal by reading the stimulated emission light emitted from the recording medium scanned by this excitation light, and the other surface side of the recording medium. An image reading unit installed at a fixed position of the recording medium, and linearly reciprocating the recording medium in a direction parallel to the recording medium with respect to the image reading unit so that image reading by the image reading unit can be repeated. The reciprocating moving means, and the erasing means for releasing the residual radiation energy on the recording medium before the image is recorded on the recording medium after the image is read by the image reading section. Radiation image information recording and reading apparatus and said Rukoto.