JP2791539B2 - Radiation image information recording and reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
Recording line image information and exciting the recorded image information
Radiographic image information recording and reading device
In regards to equipment that has a radiation detector
You. [0002] 2. Description of the Related Art For example, stimulable phosphors are used for X-rays, ultraviolet rays, etc.
Irradiates a part of the energy of this radiation
Is stored and recorded on the phosphor, after which the excitation light
Irradiates light according to the stored energy.
The phosphor emits stimulating light. [0003] The radiation image conversion panel has such characteristics.
Rigid panel with a stimulable phosphor layer with
Except in other cases, it is simply referred to as a “panel”. )
The stimulable phosphor is a latent image of radiation image of human body such as X-ray.
The latent image part can be excited by laser light or the like.
When illuminated with light, the intensity of photostimulation corresponds to the density of the latent image.
Light emission occurs. Therefore, the photostimulated luminescence light is
If it is detected by a photodetector such as an electron multiplier and processed appropriately,
The recorded radiation image can be obtained. FIG. 9 shows an image using such a panel 4.
FIG. 9 is a diagram schematically showing a conventional scanning portion of the image reading device.
In this image reading apparatus, the sheet is conveyed and moved in the Y direction to perform sub-scanning.
Panel 4 so that it can be
Then, the excitation light 81 is applied so as to perform main scanning on the panel 4 in the X direction.
And irradiate it, and detect the photostimulated light emitted
It is two-dimensionally read by a container (not shown).
Reference numeral 80 denotes a scanning line on the panel 4 surface scanned by the excitation light 81.
is there. However, this image reading apparatus has a panel 4
If it is not flexible or if it is flexible,
It is easy to be damaged by force.
Therefore, it is difficult to read the panel 4 by deforming it.
Therefore, in the conventional image reading apparatus, the moving distance of the panel 4 is
L is the space and L is the width of panel 4.
(At least twice the area of panel 4)
Moreover, the recorded panels are kept in a bright room to secure the latent image.
Since it cannot be handled, cover the entire device with light-shielding material.
And the whole shape became large. Further, the movement of the panel 4 causes the arrow to move.
In a device that realizes sub-scanning in the mark Y direction,
Cause that panel 4 itself is easily damaged and shortens the life of panel 4 itself.
It was with. Further, a driving member is required to move the panel 4.
Therefore, the distance between the subject and the panel is greatly increased.
Greatly affected by scattered radiation generated from the human body
And finally the problem of poor image information quality
May occur. Therefore, the panels are fixedly arranged and the
The part that reads the image on the panel can be moved to the panel surface.
A device that solves the above-mentioned problems has been proposed.
(For example, JP-A-58-66935). [0009] However, from the radiation source
Changes in radiation transmittance due to radiation dose fluctuations and subject differences
Movement causes fluctuations in the radiation dose of the panel, and
May have an effect. [0010] To prevent this, the stimulable phosphor must be
During recording, other parts of the phosphor are made to emit light instantly,
The amount of luminescence is detected to determine the amount of radiation accumulated in the stimulable phosphor.
For use in fixed image processing (Japanese Patent Application Laid-Open No. 55-48672)
And the detected amount of instantaneous light emission are recorded in part of the cassette.
(Japanese Patent Application Laid-Open No. 56-11346) has been proposed.
You. Also, fluctuations in recording conditions and fluctuations in excitation light quantity
Are detected by the photodetectors and read by these detection signals.
A method of adjusting the reading gain of the reading system (Japanese Patent Laid-Open No. 57-197)
No. 00) and multiple photodetectors on the back of stimulable phosphor
The instantaneous light emission of the stimulable phosphor
For performing tone correction of image signals and image signals (Japanese Patent Application Laid-Open
-116340) has also been proposed. [0012] However, all of them are stimulable fluorescent materials.
Because it detects instantaneous light emitted from an optical body,
Decrease in detection accuracy due to afterglow emitted by luminescent phosphors and photodetectors
Accurate detection from judgment errors due to insufficient response of
・ It is difficult to make judgments and thus obtain good radiation image information.
It was difficult. The present invention has been made in view of the above points.
And the purpose is the radiation dose itself to the panel
Solves the above problem by detecting and processing
Radiation to obtain high quality radiation image information
An object of the present invention is to provide a line image information recording and reading device. [0014] SUMMARY OF THE INVENTION Accordingly, the present invention provides
A radiation source that emits a ray, and
Radiation image information of the subject by the emitted radiation
Image conversion with a stimulable phosphor layer for storing and recording light
A panel and, after the irradiation, the panel with excitation light.
Scans the radiation image information stored and recorded
Image comprising excitation / reading means for selectively reading
In the information recording / reading device, the excitation / reading unit may be
Reciprocate with respect to the panel, and
Read on the outward trip and erase on the return trip
And a panel disposed on the radiation-irradiated surface side of the panel.
A radiation detector and a radiation dose from the radiation detector.
Is detected when the specified amount is reached.
Means for stopping radiation irradiation by the radiation source
did. [0015] Embodiments of the present invention will be described below. No.
FIG. 1 shows the structure of an embodiment of the radiation image information recording and reading apparatus.
FIG. 3 is a diagram showing a block of the present invention, which is applied to chest radiography.
FIG. The radiation source 1 is controlled by a radiation control device 2.
Radiated toward the subject (human chest, etc.) M
Irradiate the line. The radiation image information recording and reading device 3
The surface facing the radiation source 1 with the body M interposed
Panel 4, the panel 4 of which emits light from the radiation source 1.
According to the radiation transmittance distribution of the subject M with respect to the radiation dose
Energy stored in the stimulable phosphor layer,
To form a latent image of the subject M. Light beam generator (gas laser, solid-state laser)
, A semiconductor laser, etc.) 5 is an optical device whose emission intensity is controlled.
And the light beam passes through various optical systems described below.
To the scanner 6 through which the beam is deflected.
The optical path is changed by the mirror 7 and the panel 4 is used as excitation scanning light.
Led. The light collector 8 is a panel 4 on which the excitation light is scanned.
The light-collecting end made of an optical fiber is located close to
The latent image energy from panel 4 scanned by the beam
It receives photostimulated emission light that is approximately proportional. 9 is derived from the light collector 8
Allows only light in the stimulating wavelength region to pass from the incident light
It is a filter, and the light that passes through it is
Incident and converted into a current signal corresponding to the incident light.
You. The output current from the photomultiplier 10 is current /
The voltage signal is converted into a voltage signal by the voltage converter 11 and increased by the amplifier 12.
After the width, it is converted to digital data by the A / D converter 13
Is done. The digital data is stored in the image memory 14.
Are sequentially stored. Reference numeral 15 denotes a CPU,
Various image processing (for example,
Gradation processing, frequency processing, movement, rotation, statistical processing, etc.)
The image information as the processing result is stored in the image display device 1
6 is displayed. 17 externally stores image information in the memory 14
To receive similar information for transmission to
Interface to take. In this embodiment, the panel 4 is covered on the front surface.
A radiation detector 18 for detecting radiation transmitted through the object M;
And input the detection signal from it to the amplifier 19
doing. This amplifier 19 reduces the radiation dose to a specified value.
When it reaches, it sends a control signal to the radiation controller 2
Functions to stop irradiation. By controlling in this manner, the object M
Regardless of the situation, it is necessary to change the shooting conditions each time
And stable photographing can always be performed. Further, the radiation detected by the amplifier 19 is detected.
The detection signal from the detector 18 is transmitted to the read gain adjustment circuit 20.
The adjustment circuit 20 controls the radiation detection signal.
Adjustment of the light beam intensity of the light beam generator 5
Of the photomultiplier by adjusting the power supply voltage of the high-voltage power supply 21
Adjustment, gain adjustment of current / voltage converter 11 and amplifier 12
Adjustment and input dynamic range adjustment of the A / D converter 13
Is adjusted, and the reading gain of the radiation image information is
Adjusted. That is, the panel 4 is exposed by the radiation dose.
Radiation when forming a latent image of the body M (that is, at the time of recording)
The intensity is detected by the radiation detector 18 and the detection signal
Signal adjusts the reading gain in the next stage.
You. The radiation detector 18 is made of NaI, C
sI, BGO (Bi_FourGe_ThreeO_{1 Two}), CdWO_Four  Such as scintillator crystals
These light emissions are detected by photomultiplier, Si photodiode, etc.
Or Xe gas ionization chamber or direct conversion type (CdTe, N-S
i) etc. are used, and their radiation spectral sensitivity characteristics
Of the panel 4 is selected. The radiation detector 18 is arranged as described above.
If used, the radiation dose received by panel 4 is directly detected.
Can be used for instantaneous luminescence detection of conventional stimulable phosphors.
It is possible to perform detection without the effect of afterglow when exiting
It is possible to accurately accumulate the energy of stimulable phosphor
It can be detected. The recording conditions of the radiation source 1 etc.
Panel changes due to fluctuations and variations in radiation transmittance due to the subject M.
High-accuracy inspection, including the case where the radiation dose of
You can leave. Further, photostimulated luminescence from a conventional photostimulable phosphor
Fast response in radiation detection compared to detection of
And make accurate measurements even during short-time shooting (recording).
I can. Further, the panel 4 is read by detecting the amount of radiation received.
By adjusting the gain, the stimulated emission reading from panel 4 is also confirmed.
Be fruitful. That is, by detecting the amount of radiation received by the panel 4,
The unsuitability of the amount of light emitted from the panel 4
Intensity adjustment of light beam from raw part 5, photomultiplier 10 and A
By adjusting the read gain of the A / D converter 13 etc.
This results in the desired level of read input signal for each part.
And the read signal is processed properly.
Become like For example, FIG. 2 shows the input / output characteristics of each part of the reading system.
As shown in FIG.
Gain characteristic [FIG. 2 (a)] for panel 4
Excitation for excitation light intensity at constant latent image energy
Light amount characteristics [FIG. 2 (b)] and the basis of the A / D converter 13
Dynamic range characteristics of A / D conversion for quasi-signal
[FIG. 2 (c)] shows that each of the radiation detection signals
Depending on the input level or reference signal level adjustment,
The most suitable operation can be performed. FIG. 3 shows the structure of the radiation detector 18.
(A) to (c).
You. This detector 18 is transparent to radiation and visible
Opaque light shielding plate 18a, is irradiated with radiation
And fluorescent paper 18b, whose entire surface emits visible light, necessary for detection.
Aperture 18c for capturing light emitted from a part, captured light
Plate 18 for guiding the light to the photodetector 18d provided on the end face
e, and each of the light shielding plates 18f is laminated,
Another modification may be used. In this structure, radiation transmitted through the subject
After passing through the light shielding plate 18a, less than 1% of the radiation is fluorescent.
The light paper 18b emits light. This emitted visible light is aperture
18c, a light guide plate 18e and a light detector 18
d, and the light amount value corresponding to the irradiated radiation amount is
Is detected by the photodetector 18d. Radiation not involved in fluorescence
The lines are fluorescent paper 18b, aperture 18c, light guide plate 18
e, and passes through the light shielding plate 18f to reach the panel 4, and
The radiation image of the object M is recorded on the panel 4
Become. The shape and position of the aperture 18c,
For the size, etc., select one that is appropriate for the part to be imaged.
More preferably, [0034] Next, in FIG. 4, the panel 4 is fixedly arranged,
2 shows a mechanism portion in which a raising / reading unit is movably provided.
22 is a frame constituting the outer frame of the main body of the device 3, and 30 is
An excitation / reading unit movably provided on the frame 22.
It is a knit. The entire excitation / read unit 30 is moved.
It is configured to be fixed to the moving plate 31. This moving plate 31
A female screw body (not shown) is fixed to the
The motor (not shown) attached to the frame 22 rotates the motor.
It is screwed into a rotating male screw rod (not shown). Therefore,
The moving plate 31 is driven in the direction of the arrow Y by driving a motor.
Alternatively, it can be moved in the opposite direction. Note that this transfer
The moving mechanism is based on wire or roller, or belt
Can be configured with a ball screw.
And a feed mechanism using a roller screw is more preferable. The moving plate 31 has a light beam generated as described above.
The unit 5 is mounted (not shown in FIG. 4), and the
Beam expander that shapes (extends) the beam diameter
Galvanometer mirror via an optical system (not shown) such as
And polygon mirrors (galvano mirrors are shown in the figure)
You. ) Is reflected by the scanner 6 to become scanning light,
Through a condenser lens 32 such as an fθ lens for adjustment,
The optical path is changed at 71 to 73 to become the excitation light 81. The panel 4 is provided with the excitation / read unit 30.
The moving range is fixed to the left in FIG.
Excitation light 81 runs on this panel 4 as a scanning line 80.
Will be examined. The photomultiplier 10 is fixed to a movable plate 31.
In the light input portion, the tip is located near the scanning line 80.
Then, the light collector 8 arranged in parallel with the scanning line 80 is attached.
Have been. Now, in this device 3, the X direction on the panel 4
Main scanning in the direction (perpendicular to the plane of the drawing of FIG. 4)
The beam emitted from the beam generator 5 is swung by the scanner 6.
(Scanned), and the condensing lens 32
Is achieved by focusing on
Is the same as On the other hand, the sub-scanning in the Y direction is
The movable plate 31 in the Y direction,
This is performed by moving the excitation / reading unit 30 itself. Therefore, the panel 4 is two-dimensionally excited by the excitation light 81.
Scanning by the excitation light 81
Stimulated emission light corresponding to the density of the latent image is generated in the part
Then, the light emission is condensed by the condensing body 8 and the photomultiplier 10
, Where it is detected and becomes an electrical signal. And this
Processing the electrical signals of the camera in synchronization with the main scanning and sub-scanning
The image recorded as a latent image on panel 4
Can be played. In the apparatus of this embodiment, the panel
The panel 4 is fixed, thus damaging the panel 4
Possibilities can be minimized. In addition,
The space required to move the panel 4 is necessary
No. Further, the sub-scanning in the Y direction is performed by the excitation / reading unit 30 itself.
Moves, and the moving range is the length of the panel 4 in the Y direction.
That's enough. Therefore, it is possible to reduce the size of the entire device.
it can. In the sub-scanning in the direction of arrow Y,
In order to stabilize the moving operation of the moving plate 31,
Guide mechanism such as slide shaft and rail for guiding
Is desirably provided. Also, as described above, the excitation / read unit
When 30 is configured, mutual misalignment (misalignment) of each part
Thus, the image reading can be performed more stably. Further, the panel 4 itself can be transported and moved.
No driving member is required for the
And the distance between the subject M can be greatly reduced,
The above-described radiation detector 18 or a moving grid described later
It is also possible to insert a device in between, generated from the subject M
Greatly reduces the effects of scattered radiation
Bottom can be prevented. In this embodiment, the moving body is an excitation / reading unit.
Because of the moving plate 31 on which the knit 30 is mounted,
The speed change is not preferable, and the reading is
It is necessary to adjust the speed within a range that does not affect the taking. Fig. 5
Indicates the change in sub-scanning speed during a series of operations.
Then, when a sudden speed change is made as in (a), the optical system
There is a possibility of giving an impact, but as shown in (b)
If you adjust the speed at the time of stop, it is difficult to give a shock. Furthermore,
If you adjust so that the speed change becomes slow like (c)
More preferred. In addition, like (b) or (c)
In addition to the speed change, both ends of the stroke of the moving plate 31
If the shock absorbing structure is adopted, the excitation
More preferable to alleviate the impact on the reading / reading unit 30
Becomes Further, in the above embodiment, the reflection mirrors 71 to 73
Therefore, the optical path is bent.
Change the substantial optical path length between the
The space occupied by the fan-shaped scanning light can be reduced.
Therefore, inserting multiple reflectors like this in the optical path
This greatly contributes to downsizing of the device. In this device, the panel 4 is fixed.
In addition, its application range becomes extremely wide. In particular, panel 4
When forming a latent image, a radiation imaging device is integrated with this device.
And directly record a radiographic image on the fixed panel 4,
Thereafter, this image can be read by the mechanism described above.
Wear. That is, panel 4 can be used repeatedly,
In this case, the possibility of damage to the panel 4 is minimized.
You. By the way, as described above, the panel 4 is
So that it can be used repeatedly without removing it from
In order to erase the latent image remaining after scanning,
Need to be This erase irradiates the panel 4 with strong light.
FIGS. 4 and 6
As shown in FIG.
The light collector 8 is substantially flat on the opposite side to the inspection direction (the direction of the arrow Y).
It is sufficient if this ramp 33 is fixed to the moving plate 31
No. In addition, the lamp 33 efficiently emits light therefrom.
To irradiate the panel 4 with a reflector 34
To do. The light collector 8 and the lamp 33 are integrated.
The part that completed the reading while scanning the image
It is possible to sequentially erase the minutes,
Is incident on the light collector 8 or illuminates the scanning line 80 currently being read.
When shot, it becomes a loud noise and is detected by Photomaru 10.
Problem occurs. Therefore, in order to prevent this, the arrow Y
Scans during sub-scanning in the direction, and moves in the opposite direction.
The process of erasing on return
preferable. Also, the light at the time of erasing by the lamp 33 is
Therefore, deterioration of the photocathode of the photomultiplier 10 is suppressed.
Therefore, in the optical path from the scanning line 80 to the photomultiplier 10,
It is preferable to provide light-shielding means that can be inserted and removed. this
By doing so, the lamp light to the photomultiplier 10 is blocked.
And extend its lifespan.
In addition, trouble in the next reading is reduced. Light shielding used as light shielding means in this case
The plate is a film that transmits stimulating light and attenuates excitation light.
It may be replaced with a mechanism. Also, as light shielding means
Alternatively, a liquid crystal shutter can be used. In the apparatus 3 of the embodiment shown in FIG.
Indicates that the panel 4 is fixed in a vertical state, and one of the panels 4
Scanning mechanism for excitation light, reading mechanism for stimulated emission light,
And a recording / erasing mechanism, the other side (the
Place the subject on the left side in Fig. 4) and radiate the radiation.
With this, the radiation image is recorded on the panel 4 in the fixed state.
Can be In this case, after the panel 4
Part, that is, the part placed on the side where the above mechanism is configured
The radiation scattered by the
For the components behind the
For parts that can be moved or moved,
Move to a position outside the range before shooting
Is preferred. FIG. 7 shows that the moving grid 25 is
FIG. 3 shows an example in which the device is disposed between the radiation detector 18 and the radiation detector 18.
You. The moving grid 25 includes a grid driving motor 26
And in front of the radiation detector 18 by a cam mechanism (not shown)
Is configured to be able to reciprocate in the horizontal direction. Such a transfer
By using the moving grid 25,
Most of the radiation scattered radiation can be removed,
Useful radiation images can be obtained. It should be noted that the moving grid 2 having the above-described mechanism is used.
In 5, the specified speed is not used because the moving speed is not constant.
When irradiation is reached, the radiation
It is necessary to synchronize the imaging. On the other hand, the stimulable phosphor has an image on the panel.
Instantaneous light emission of panel when irradiating radiation for recording
Light is attenuated immediately after stopping irradiation
There is an “instant afterglow” that continues to emit light. Ma
The radiation energy recorded on the panel is
Immediately after the information was recorded, it was largest and then gradually released.
There is also fading "dark fading". There
In image reading, the former instantaneous afterglow is not
As late as possible, fast against the latter dark fading
It is best to read well, but there is also a trade-off between the two
Required. FIG. 8 shows the operation of each part in image recording and reading.
It is a figure showing a timing. Radiation irradiation (photography) switch
When the switch is turned on, the grid drive motor rotates to
Release from the radiation source 1 when the
Radiation irradiation is performed. This radiation dose is the radiation detector
Detected at 18, and the irradiation amount reaches a preset specified value.
At that time, the irradiation is stopped. After a certain period of time, the movable plate 31
The movement is started, and the image of the panel 4 is read. What
Note that from the irradiation to the start of reading,
Depending on the type, it is preferably about 0.01 to 60 seconds, but preferably 0.1 to 60 seconds.
About 01-10 seconds is good. In this reading, the moving speed of the moving plate 31
After stabilization, the light beam generator 5, the scanner 6,
Tomal 10 is turned on for a predetermined time to become active,
The light shielding means for protection of the photomultiplier 10 is also only for a predetermined time.
Open to allow light to pass through. During this predetermined time
Is read. Thus, each part need
It is effective to prolong the service life by operating only time
It is. Then, the moving plate 31 moves in the direction opposite to the arrow Y direction.
When returning, the erase lamp 33 lights up and remains on the panel 4.
The remaining latent image is erased. As described above, the radiation detector 18 and the panel 4
And the excitation / reading unit 30 are reciprocated.
By moving it, shooting (recording) and reading are integrated,
The whole can be configured compactly and functionally. Further above
Depending on the configuration, it is not possible to change the shooting conditions each time
And stable shooting can be performed. Better picture
Read image information and obtain good quality radiation image information
Can be done. In the above embodiment, the panel 4 is vertically
The vertical position of the recording and reading device is shown, but the panel
Similar configuration for the so-called “lying position” where 4 is laid horizontally
Needless to say, it can be realized by: The stimulable fluorescence in panel 4 described above
The body is exposed to the first light or high-energy radiation.
Optical, thermal, mechanical, chemical or electrical, etc.
Of the first light or high energy
Phosphors that show stimulated emission corresponding to the amount of
However, from a practical point of view, it is preferable that the stimulus
It is a phosphor that shows stimulated emission by excitation light. Stimulable Fluorescence Used for Panel 4 of the Present Invention
As the body, for example, described in JP-A-48-80487
BaSO_Four : Ax (where A is Dy, Tb and Tm
X is at least one of 0.001 ≦ x <1 mol%
You. ), A phosphor represented by M described in JP-A-48-80488.
gSO_Four : Ax (where A is either Ho or Dy
And x is 0.001 ≦ x ≦ 1 mol%. )
Phosphors, Sr described in JP-A-48-80489
SO_Four : Ax (where A is less of Dy, Tb and Tm)
X is at least 0.001 ≦ x <1 mol%
You. ), Described in JP-A-51-29889.
Na_Two SO_Four , CaSO_Four And BaSO_Four etc
At least one of Mn, Dy and Tb was added to
Phosphors, BeO, L described in JP-A-52-30487
iF, MgSO_Four And CaF_Two Etc., JP-A-53-3
Li described in No. 9277_Two B_Four O₇ : Cu, Ag
Phosphors such as Li described in JP-A-54-47883.
_Two O ・ (B_Two O_Two ) X: Cu (where x is 2 <x ≦ 3),
And Li_Two O ・ (B_Two O_Two ) X: Cu, Ag (where x is
2 <x ≦ 3) etc., described in US Pat. No. 3,859,527
SrS: Ce, Sm, SrS: Eu, Sm,
La_Two O_Two S: Eu, Sm and (Zn, Cd) S: M
Examples of the phosphor represented by n and X (where X is a halogen) include:
It is. Further, it is described in JP-A-55-12142.
ZnS: Cu, Pb phosphor, whose general formula is BaO.xAl_Two
O_Three : Aluminate represented by Eu (where 0.8 ≤ x ≤ 10)
Barium phosphor, and the general formula is M^IIOxSiO_Two : A
(However, M^IIIs Mg, Ca, Sr, Zn, Cd or Ba
Where A is Ce, Tb, Eu, Tm, Pb, Tl, B
at least one of i and Mn, and x is 0.5 ≦ x
<2.5. ) Alkaline earth metal silicates
Phosphors. Also, described in JP-A-55-12143.
General formula is (Ba_1-xyMg_xCa_y) FX: eEu
²⁺ (Where X is at least one of Br and Cl;
x, y and e are respectively 0 <x + y <0.6, xy ≠ 0 and
And 10^-6≦ e ≦ 5 × 10^-2Number that satisfies
You. Alkaline earth fluoride halide fluorescence
The general formula described in JP-A-55-12144, LnOX: xA (Where Ln is at least one of La, Y, Gd and Lu
X is Cl and / or Br, A is Ce and / or
Represents Tb, and x represents a number satisfying 0 <x <0.1. ) so
The phosphor represented by the method described in JP-A-55-12145
The general formula is (Ba_1-xM^II _x) FX: yA (However, M^IIIs among Mg, Ca, Sr, Zn and Cd
X is at least one of Cl, Br and I
At least one, A is Eu, Tb, Ce, Tm, Dy,
At least one of Pr, Ho, Nd, Yb and Er
Where x and y are such that 0 <x ≦ 0.6 and 0 ≦ y ≦ 0.2
Indicates the number that satisfies the condition. ), A phosphor represented by
The general formula described in No. 4389 is BaFX: xCe, yA (Where X is at least one of Cl, Br and I,
A is at least one of In, Tl, Gd, Sm and Zr
And x and y are each 0 <x ≦ 2 × 10^-1
And 0 <y ≦ 5 × 10^-2It is. ) Phosphor,
The general formula described in JP-A-55-160078 is M^IIFX xA: yLn (However, M^IIIs Mg, Ca, Ba, Sr, Zn and Cd
At least one of them, A is BeO, MgO, CaO, S
rO, BaO, ZnO, Al_Two O_Three , Y_Two O_Three , La_Two
O_Three , In_Two O_Three , SiO_Two , TiO_Two , ZrO_Two , G
eO_Two , SnO_Two, Nb_Two O_Five , Ta_Two O_Five And ThO_Two
 Ln is Eu, Tb, Ce,
Tm, Dy, Pr, Ho, Nd, Yb, Er, Sm and
X is Cl, Br or at least one of Gd.
X and y are each at least one of
5 × 10^-Five≤ x ≤ 0.5 and 0 <y ≤ 0.2
It is the number to add. ) Rare earth element activated divalent metal
Fluorohalide phosphor, whose general formula is ZnS: A, Cd
S: A, (Zn, Cd) S: A, ZnS: A, X and C
dS: A, X (where A is Cu, Ag, Au or Mn)
And X is halogen. Phosphor) represented by
Any of the following general formulas described in No. 57-148285 XM_Three(PO_Four )_Two・ NX_Two : YA M_Three(PO_Four )_Two: YA (Where M and N are Mg, Ca, Sr, Ba,
At least one of Zn and Cd, X is F, Cl,
At least one of Br and I, A is Eu, Tb, C
e, Tm, Dy, Pr, Ho, Nd, Yb, Er, S
b, Tl, Mn and Sn at least one of
You. Also, x and y are such that 0 <x ≦ 6 and 0 ≦ y ≦ 1.
Is a number that satisfies ) Phosphor, any of the following
General formula NReX_Three ・ MAX '_Two : XEu nReX_Three ・ MAX '_Two : XEu, ySm (Wherein Re is at least one of La, Gd, Y, and Lu
A is an alkaline earth metal, Ba, Sr, Ca
And at least one of X and X 'is F, Cl or Br
Represents at least one kind of X and y are 1 × 10
^-Four<X <3 × 10^-1, 1 × 10^-Four<Y <1 × 10^-1Become
It is a number that satisfies the condition, and n / m is 1 × 10^-3<N / m <
7 × 10^-1It is a number that satisfies the following condition. )
Light body, and the following general formula M^IX ・ aM^IIX '_Two ・ BM^IIIX ''
_Three : CA (However, M^IIs selected from Li, Na, K, Rb and Cs
At least one alkali metal,^IIIs B
e, Mg, Ca, Sr, Ba, Zn, Cd, Cu and N
at least one divalent metal selected from i. M
^IIIAre Sc, Y, La, Ce, Pr, Nd, Pm, S
m, Eu, Gd, Tb, Dy, Ho, Er, Tm, Y
at least one selected from b, Lu, Al, Ga and In
One type of trivalent metal. X, X 'and X "are F, C
at least one halogen selected from l, Br and I
It is. A is Eu, Tb, Ce, Tm, Dy, Pr, H
o, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl,
At least one selected from Na, Ag, Cu and Mg
Metal. A is a numerical value in the range of 0 ≦ a <0.5.
B is a numerical value in the range of 0 ≦ b <0.5, and c is 0 <c
It is a numerical value in the range of ≦ 0.2. Alkali harassment represented by)
And an id phosphor. Especially alkali halide fluorescence
The body is made of a stimulable phosphor layer by evaporation, sputtering, etc.
Is preferred because it is easy to form. However, the stimulus used in the panel of the present invention is
The phosphors are not limited to the above-mentioned phosphors, but
After irradiating with radiation, irradiates with stimulating excitation light
Any phosphor that shows light can be used.
You. The panel of the present invention comprises the above-described stimulable phosphor.
At least one or more stimulable fluorescent light
A stimulable phosphor layer group composed of a body layer may be used. Also,
The stimulable phosphor contained in each stimulable phosphor layer is the same.
They may be one or different. [0079] As described above, according to the present invention, the radiation detector
Can directly detect the radiation dose received by the panel
And feed back the radiation dose signal to the radiation source
The total amount of radiation reaching the panel
Can be kept constant. For this reason, radiation fluctuation based on the radiation source and
Variation of the radiation transmittance due to the difference of the subject causes the panel radiation
So that it does not affect the wire reception
Regardless of the fluctuation of the subject and the recording conditions,
Always shoot with stable S / N without changing
Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a configuration of a radiation image information recording / reading apparatus according to an embodiment of the present invention. FIG. 2 is an input / output characteristic diagram of each unit of a reading system of the apparatus. FIG. 3 is an explanatory diagram of a radiation detector. FIG. 4 is an explanatory diagram showing an internal mechanism of the device. FIG. 5 is a movement characteristic diagram of the excitation / read unit. FIG. 6 is an explanatory diagram of an erase lamp portion. FIG. 7 is an explanatory diagram of a panel portion to which a moving grid is added. FIG. 8 is a time chart showing operation timings of the device. FIG. 9 is an explanatory diagram of image reading of a conventional panel. [Description of Signs] 1: radiation source, 2: radiation control device, 3: radiation image information recording / reading device, 4: radiation image conversion panel, 5:
Light beam generator, 6: Scanner, 7: Reflector, 8: Condenser, 9: Filter, 10: Photomultiplier, 11: Current / voltage converter, 12: Amplifier, 13: A / D converter, 14:
Image memory, 15: CPU, 16: Display, 17: Interface, 18: Radiation detector, 19: Amplifier, 2
0: adjustment circuit, 22: frame, 25: moving grid,
26: grid drive motor, 30: excitation / reading unit, 31: moving plate, 32: condenser lens, 33: erase lamp, 34: reflection plate, 71 to 73: reflection mirror, 80: scanning line, 81: excitation light .

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Mitsuru Ishii 1 Sakuramachi, Hino-shi, Tokyo Konica Co., Ltd. Examiner Kiyoshige Suemasa (56) References JP-A-61-98343 (JP, A) JP-A-56-19040 (JP, A) JP-A-56-154722 (JP, A) JP-A-55-19781 (JP, A) JP-A-58-66935 (JP, A) (58) Fields investigated (Int .Cl. ⁶ , DB name) G03B 42/02

Claims (1)

(57) [Claims] A radiation source that emits radiation, a radiation image conversion panel having a stimulable phosphor layer that accumulates and records radiation image information of the subject by radiation irradiated from the radiation source via the subject, and after the radiation irradiation Excitation / reading means for scanning the panel with excitation light and photoelectrically reading the stored and recorded radiation image information, a radiation image information recording / reading apparatus comprising: Reciprocating
And read on the outward path of the reciprocating movement of the excitation / reading means.
A configuration in which erasing is performed in the return path, and a radiation detector arranged on the radiation irradiation side of the panel, and the radiation detector detects that the radiation amount has reached a specified amount by the radiation detector. A means for stopping radiation irradiation by the radiation source.