JP2000341477A - Method and device for reading image information using image recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a device which reads radiographic information by using an image recording sheet to read the information before a radiograph is recorded on the recording sheet. SOLUTION: An image information read device is provided with an image recording section 10, in which an accumulating phosphor layer 12 is laminated upon a base 11 and an image read section 20 which has an a-Se made photoconductive layer 23 and stripe electrodes arranged on both sides of the layer 23 and works as a solid-state image detector and uses a radiograph detecting sheet 1, a stripe electrode 26 side of which is laminated opposite to the phosphor layer 12. While a radiograph is being recorded by it radiating radiation L2 carrying image information upon the phosphor layer 12, pre-read image signals are obtained by taking out charges which are generated in the photoconductive layer 23, by making the radiation L2 or instantaneous light emitted from the phosphor layer 12 incident on the photoconductive layer 23 from the image read section 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image information reading method and apparatus for obtaining an image signal carrying image information using an image recording sheet having a stimulable phosphor layer.

[0002]

2. Description of the Related Art When a radiation is irradiated, a part of the radiation energy is accumulated, and thereafter, when an excitation light such as a visible light is irradiated, a stimulable phosphor (stimulable fluorescent light) which emits stimulated light in accordance with the accumulated energy. The radiographic image information of a subject such as a human body is once photographed and recorded on a sheet-like stimulable phosphor having a stimulable phosphor layer (a stimulable phosphor sheet; an embodiment of an image recording sheet) by utilizing the body. An image information reading method for scanning the sheet with excitation light such as laser light to generate photostimulated light, and photoelectrically reading the obtained photostimulated light to obtain an image signal carrying radiation image information; The devices are already well known (JP-A-55-12429, JP-A-56-11395, and JP-A-55-11395).
-163472, 56-104645, 55-116340, etc.). This method and apparatus have the practical advantage of being able to record images over a very wide radiation exposure area compared to conventional silver halide photography radiography systems.

On the other hand, in the above method and the like, before obtaining an image signal by reading under optimum reading conditions according to the dose of radiation applied to the stimulable phosphor sheet or the like, a stimulable phosphor beam is previously irradiated with a low-level light beam. In order to grasp the outline of the dynamic range etc. of the radiation image recorded on this sheet by scanning the body sheet, "read ahead" is performed prior to the so-called "book read" and the look ahead image signal obtained by this look ahead is analyzed. After that, the sheet is irradiated with a high-level light beam and scanned, an image signal is obtained by reading the radiation image under optimum reading conditions, and furthermore, an optimal image processing for performing image processing on the image signal is performed. 2. Description of the Related Art There is known a system configured to determine a condition, perform image processing under the optimum image processing condition, and perform a main reading to obtain a final image signal.

A method for setting reading conditions and image processing conditions without performing pre-reading has been proposed by the present applicant (JP-A-55-48672, JP-A-55-50180, and JP-A-55-50180.
No. 56-11348). According to this method, instantaneous light (instantaneous emission light) emitted from the stimulable phosphor sheet when the sheet is irradiated with radiation is detected by a dedicated detector such as a photo timer, and the characteristics of the radiation image or the accumulation are detected from the instantaneous light. This is a method of obtaining information such as the amount of radiation accumulated and recorded on the luminescent phosphor sheet and determining reading conditions and the like.

[0005] In the above description, "low (high) level" means that the total amount (amount x time) of the dose applied to the stimulable phosphor sheet is low (high). To lower the level, for example, lower the radiation dose level,
Alternatively, the scanning speed is increased to reduce the number of pixels as compared with the main reading, thereby performing coarse reading.

The reading condition is a general term for various conditions that affect the relationship between the amount of stimulated emission light in reading and the output of the reading device. For example, a reading gain, which determines the relationship between input and output, It means the scale factor or the power of the excitation light in reading.

Further, the image processing condition is a general term for various conditions when a process which affects the gradation and sensitivity of a reproduced image based on the image signal is performed on the image signal. In a system that does not perform the reading, the reading gain and the scale factor, which are the above-described reading conditions, are also included. The method for determining the optimum image processing conditions based on this image signal is not limited to a system using a stimulable phosphor sheet, and obtains an image signal from a radiation image recorded on a recording sheet such as a conventional X-ray film. It is also applied to the system. It should be noted that a system for determining such reading conditions and / or image processing conditions is provided by EDR.
Sometimes referred to as a processing system or EDR processing means.

[0008]

However, when the stimulable phosphor sheet is scanned in advance with a low-level light beam and pre-read is performed, the amount of information obtained in the main read is reduced by that amount, and a system in which pre-read is not performed is performed. Although slightly, the S / N deteriorates. Excitation light scanning for pre-reading is necessary, and when reading an image,
The corresponding time loss occurs.

On the other hand, a method of determining reading conditions and image processing conditions using a dedicated detector such as a phototimer causes a cost increase by the amount of the detector. In addition, since a detector such as a photo timer generally has a narrow detection area and a limited measurement area, there is also a problem that accurate conditions cannot be set.

The present invention has been made in view of the above circumstances, and in the case of reading image information using an image recording sheet having a stimulable phosphor layer, the so-called read-ahead performed prior to the so-called book reading affects the book reading. It is an object of the present invention to provide an image information reading method and apparatus which can be performed accurately and without increasing the cost without giving the image information.

[0011]

According to the image information reading method of the present invention, an image having a stimulable phosphor layer that generates stimulated emission light in an amount corresponding to the energy accumulated by being irradiated with excitation light is provided. Using a recording sheet and a solid-state image detector having a photoconductive layer that exhibits conductivity by being irradiated with the stimulating light, scanning an image recording sheet on which image information is recorded with excitation light. Irradiates the photostimulated light obtained by the method into the photoconductive layer, and detects an electric charge generated in the photoconductive layer with the incident by applying an electric field to the photoconductive layer, thereby obtaining an image carrying image information. An image information reading method for obtaining a signal, wherein a photoconductive layer, as a solid-state image detector, emits from a stimulable phosphor layer by recording light (for example, recording radiation) carrying image information or irradiation of the recording light. Instantaneous light Using a material that exhibits conductivity by being irradiated, irradiating the image recording sheet with recording light while applying an electric field to the photoconductive layer, causing the recording light or instantaneous light to enter the photoconductive layer, A pre-read image signal carrying image information is obtained by detecting charges generated in the photoconductive layer.

That is, in the image information reading method of the present invention, a pre-read image signal can be obtained by using the solid-state image detector used in the main reading. In view of this point, the image information reading method of the present invention is preferably applied to a system in which an image recording device and an image reading device are integrated, and further, an image recording method having a stimulable phosphor layer. It is preferable to apply the present invention to a two-dimensional detection sheet in which a sheet and a solid-state image detector having a photoconductive layer are integrated.

The solid-state image detector is not limited to a two-dimensional detector (plane) having substantially the same area as the image recording sheet, but may be a one-dimensional detector (line) or a zero-dimensional detector (elongate or sheet). Smaller area). When a one-dimensional detector or a zero-dimensional detector is used, information on substantially the entire surface of the image recording sheet can be obtained during irradiation of recording light.
By moving the solid-state image detector relative to the sheet faster than at the time of main reading (normally, the sheet itself cannot be moved at the time of recording, so the detector itself is moved), and a pre-read image signal is obtained. Is desirable (coarse detection is sufficient).

In the case where the solid-state image detector is a two-dimensional detector, in order to obtain a more accurate pre-read image signal, the solid-state image detector is stacked so as to sandwich a photoconductive layer. Recording electrode having two electrode layers each having a plurality of linear electrodes, and one of the two electrode layers being a stripe electrode having a large number of linear electrodes arranged therein. Alternatively, it is desirable to detect charges generated in the photoconductive layer when instantaneous light enters the photoconductive layer for each linear electrode of one electrode layer.

Further, in order to obtain a more accurate pre-read image signal, the solid-state image detector includes electrodes of the other electrode layer of the two electrode layers, each of which is a linear electrode of the one electrode layer. A stripe electrode formed by arranging a large number of linear electrodes arranged so as to intersect with the substrate is used, and is generated in the photoconductive layer when recording light or instantaneous light enters the photoconductive layer. It is desirable to detect the electric charge also for each linear electrode of the other electrode layer.

In this case, a pre-read image signal detected for each linear electrode of the one electrode layer and each linear electrode of the other electrode layer arranged in the longitudinal direction of the linear electrode of the one electrode layer. And the pre-read image signal detected for each
By using these two prefetch image signals, more detailed prefetch information can be obtained.

Note that how to use the two pre-read image signals differs depending on the recording light irradiation conditions. For example, when taking the form of a so-called bombardment, one-dimensional compression information integrated in the length direction of the linear electrode of the one electrode layer is obtained from the linear electrode of the one electrode layer. One-dimensional compression information integrated in the direction orthogonal to the length direction of the linear electrode of the electrode layer is obtained from each linear electrode of the other electrode layer. This makes it possible to obtain more detailed prefetch information based on the two obtained one-dimensional compression information.

An image information reading apparatus according to the present invention has an excitation light source for emitting excitation light, and has a storage property of generating a stimulated emission light in an amount corresponding to energy stored by being irradiated with the excitation light. Excitation light scanning means for scanning an image recording sheet having a phosphor layer with excitation light, a solid-state image detector having a photoconductive layer which exhibits conductivity when irradiated with the stimulating light, and the solid-state image detection Voltage applying means for applying a voltage for generating an electric field in the photoconductive layer of the container, and stimulated emission light obtained by scanning an image recording sheet on which image information is recorded with excitation light to the photoconductive layer. An image signal reading device comprising: an image signal obtaining unit that obtains an image signal carrying image information by detecting an electric charge generated in the photoconductive layer by allowing the light to enter, and detecting an electric field by applying an electric field to the photoconductive layer. , The photoconductive layer of the body image detector exhibits conductivity by receiving recording light carrying image information or instantaneous light emitted from the stimulable phosphor layer by irradiation of the recording light. Or further comprising a pre-read image signal acquiring means for detecting a charge generated in the photo-conductive layer by the instantaneous light being incident on the photo-conductive layer and obtaining a pre-read image signal carrying image information. Is what you do.

In the image information reading apparatus according to the present invention, the solid-state image detector has two electrode layers having electrodes stacked so as to sandwich the photoconductive layer, and one of the two electrode layers. The electrode of the electrode layer is a stripe electrode formed by arranging a large number of linear electrodes, and the pre-reading image signal acquiring unit is configured to perform the recording or the instantaneous light when the photoconductive layer enters the photoconductive layer. It is desirable to detect the electric charges generated in each of the linear electrodes of one electrode layer.

In the image information reading apparatus according to the present invention, the solid-state image detector may be configured such that an electrode of the other one of the two electrode layers intersects each linear electrode of the one electrode layer. Is a stripe electrode formed by arranging a large number of linear electrodes arranged as described above, and the pre-read image signal acquiring means is configured such that when recording light or instantaneous light enters the photoconductive layer, It is desirable to detect the electric charge generated in each of the linear electrodes of the other electrode layer.

[0021]

According to the method and the apparatus for reading image information of the present invention, a solid-state image detector having a photoconductive layer exhibiting conductivity when irradiated with recording light or instantaneous light is used. By detecting charges generated in the photoconductive layer of the solid-state image detector by irradiating the image recording sheet with light, a pre-read image signal is obtained, so that the image can be stored without providing a pre-read-only detector. Even while the image information is being recorded on the luminescent phosphor layer, it is possible to obtain a pre-read image signal by extracting electric charges from the solid-state image detector for main reading. This eliminates the need for a read-only detector,
Pre-reading does not increase costs.

The prefetching according to the present invention is performed while image information is recorded on the stimulable phosphor layer (at the time of image recording), and the conventional prefetching performed prior to the main reading after the image recording is performed. Unlike this, there is no reduction in the amount of information obtained in the main reading, and there is no influence on the main reading such as S / N degradation.

Further, since the pre-reading is performed at the time of image recording, the scanning of the excitation light for the pre-reading is unnecessary, and no time loss occurs at the time of image reading.

Further, in the case of using a zero-dimensional or one-dimensional detector, the solid-state image detector can be moved relative to the image recording sheet at the time of image recording, for example, at a higher speed than at the time of the main reading by using the scanning system for the main reading. It is possible to obtain the pre-read information about the entire surface of the sheet by moving it, so that even if the detector itself cannot cover the entire surface of the sheet, it is necessary to accurately set the reading conditions and the image processing conditions. Can be.

When a two-dimensional detector having substantially the same area as the image recording sheet is used, a solid image detector having a stripe electrode formed by arranging a large number of linear electrodes (preferably a photoconductive layer is used). If the charge generated in the photoconductive layer when recording light or the like is incident on the photoconductive layer is detected for each linear electrode by using both of the two electrodes, a precise read-ahead can be achieved. Can be performed.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a schematic configuration of a first embodiment of a radiation image detecting sheet used in a recording and reading apparatus to which the image information reading apparatus of the present invention is applied, and FIG. 1 (A) is a perspective view. FIG. 1B is an XY cross-sectional view of the P arrow finger portion, and FIG.
(C) is an XZ sectional view of the Q arrow finger part.

The detection sheet 1 has a stimulable phosphor layer 12 that generates stimulated emission light in an amount corresponding to the accumulated energy when irradiated with excitation light, and is laminated on a base (support) 11. Image recording unit 10 as an image recording sheet, and a number of flat elements (linear electrodes)
A first electrode layer 21 on which a first stripe electrode 22 formed by arranging stripes 22a in a stripe shape, a photoconductive layer 23 which exhibits conductivity when irradiated with photostimulated light, a large number of plate-like elements 26a Electrode layer 2 on which a second stripe electrode 26 formed by arranging in a stripe shape is formed.
And an image reading unit 20 as a solid-state image detector in which the second electrode layers 25 are stacked in this order.
And the stimulable phosphor layer 12 are stacked facing each other.

The image recording section 10 includes a stimulable phosphor layer 12
Is excited by red excitation light having a wavelength of 600 nm or more,
And 500 nm or less (preferably 400 nm to 450 n
Any type of material that can generate the blue stimulated emission light of m) may be used, and a known stimulable phosphor sheet can be used. Although not shown,
In addition to the stimulable phosphor layer 12, for example, a protective layer and a sensitizing layer are provided.

As the material of the photoconductive layer 23, not only the stimulating light L4 emitted from the stimulable phosphor layer 12, but also the radiation (recording light L2) or the stimulable phosphor layer 12 irradiated with the radiation. A material that exhibits conductivity even when irradiated with emitted instantaneous light is used. For the main reading, any photoconductive substance that exhibits conductivity when irradiated with stimulating light emitted from the stimulable phosphor layer 12 may be used. As described above, in combination with the above-described stimulable phosphor layer 12 that generates blue stimulating light having a wavelength of 500 nm or less (for example, around 400 nm), a-Se
A photoconductive substance containing, as a main component, is preferred. The thickness of the photoconductive layer 23 is preferably 1 μm or more in order to sufficiently absorb the stimulated emission light and to make the avalanche amplification function work to increase the signal level that can be extracted. Thicker is preferable to reduce the capacitance and suppress fixed noise. However, if the film thickness is too thick, the power supply voltage increases.Therefore, considering the power supply voltage, the avalanche amplification effect and the fixed noise are considered. For example, the thickness is set to 1 μm or more and 100 μm or less, and more preferably 10 μm or more and 50 μm or less so as to increase the ratio.

If a-Se is used for the photoconductive layer 23, it is possible to make the photoconductive layer 23 transparent to the red light as the excitation light, so that the excitation light can be accumulated through the photoconductive layer 23. Irradiation to the phosphor layer 12 is also possible.

Each element 2 of the first stripe electrode 22
2a is each element 26a of the second stripe electrode 26.
Are arranged so as to be substantially orthogonal to the. In each case, the same number of elements as the number of pixels in the arrangement direction are provided. The arrangement pitch of the elements defines the pixel pitch.

When the excitation light is irradiated from the image reading section 20 side, both electrode layers 21 and 25 are permeable to the excitation light. In order to have transparency, both elements 22a and 26a are made of ITO (Indium Tin O2).
xide) It is preferable to use a known transparent conductive film such as a film. If the two elements 22a, 26a are not made transparent, at least the elements 22a, 26a
a of the stimulable phosphor layer 12 through the gaps 21a and 25a.
To be incident.

The second electrode layer 25 is also permeable to stimulated emission light L4 emitted from the stimulable phosphor layer 12. In order to have transparency, it is preferable to use a transparent conductive film such as the above-mentioned ITO film as the element 26a.

FIGS. 2 and 3 show a radiation image information recording (photographing) device and a radiation image information reading device integrated with each other.
Recording / reading device 11 using the radiation solid detection sheet 1
FIG. 2 shows a schematic configuration diagram of a detection sheet 1.
FIG. 3 is a diagram showing the detection sheet 1 along with an XZ cross-sectional view of the arrow Q finger portion.

The recording / reading device 110 includes the detection sheet 1
, A current detection circuit 80, an A / D converter 86, a data correction unit 87, and a ROM table 88. The data correction section 87 and the ROM table 88 are provided to suppress signal fluctuations caused by fluctuations in the electric field applied to the photoconductive layer 23, and function as suppression means according to the present invention. is there. Further, a radiation irradiating means 90 for irradiating the detection sheet 1 with radiation (hereinafter, referred to as recording light) L2 which emits radiation L1 such as X-rays and transmits through the subject 9, and excitation light irradiation for irradiating the detection sheet 1 with excitation light L3 A means (excitation light scanning means) 92 is provided.

The radiation irradiating means 90 and the excitation light irradiating means 92 are both disposed on the first electrode layer 21 side of the image reading section 20, and the excitation light irradiating means 92, in particular, the excitation light source 92a
Is configured to be retractable so as not to hinder the recording light L2 from being incident on the detection sheet 1 during irradiation with radiation.

The excitation light irradiating means 92 applies a substantially uniform red excitation light L3 having a wavelength of not less than 600 nm in a line shape to the longitudinal direction of the element 22a, The scanning exposure is performed from one end to the other end in the scanning direction. As the excitation light source 92a that emits the excitation light L3, an elongated L
An ED or the like can be used, and the excitation light irradiating means 92 may scan the excitation light L3 by moving the LED relatively to the detection sheet 1.
A planar light source, such as a liquid crystal or an organic EL, in which linear light sources are arranged in a plane, is integrally formed with the detection sheet 1, and the linear light sources are electrically scanned, that is, by sequentially switching the linear light sources. , May be scanned in the longitudinal direction of the element.

It is to be noted that the scanning is not limited to the line-shaped excitation light, but is performed in the direction perpendicular to the longitudinal direction of the element 22a, ie, in the main scanning direction, while scanning the stripe electrodes 22 with the light beam sequentially in the sub-scanning direction. It may be. Further, the excitation light L3 may be continuous light emitted continuously or may be pulsed light emitted in a pulse shape, but a high-output pulsed light detects a larger current. Can improve the S / N of the image,
For this reason, in the present embodiment, high-output pulse light of about 100 μsec is applied to each read line in this embodiment.

The current detection circuit 80 includes an operational amplifier 81a,
It has a large number of current detection amplifiers 81 each including an integrating capacitor 81b and a switch 81c. Each element 22a of the stripe electrode 22 is separately
It is connected to the inverting input terminal (-) of the operational amplifier 81a.

The current detecting circuit 80 is provided in the image reading section 2.
0, a predetermined voltage is applied between the two electrode layers 21 and 25,
Power supply 82 and switch 8 for generating an electric field in photoconductive layer 23
3. It has a voltage applying means 85 comprising a switch section 84. The switch section 84 has a large number of switching elements 84a that are individually connected to each of the elements 26a of the second stripe electrode 26. The other terminal of each switching element 84a is commonly connected to the negative side of the power supply 82. The positive electrode side of the power supply 82 is commonly connected to each non-inverting terminal (+) of the operational amplifier 81a via a switch 83.

The voltage applying means 85 operates in response to a command from a control means (not shown), among a number of elements 26a of the second electrode layer 25, in conjunction with the scanning exposure of the excitation light L3, and the line exposure is performed by the scanning exposure. The switching element 84a of the switch unit 84 is connected so that the element 26a of the readout line to which the excitation light L3 is
Are sequentially switched so that either of them is turned on. As a result, the read line element 26a and all elements 2
2a, a voltage is applied from the power supply 82 via an imaginary short circuit of the switch 83 and the operational amplifier 81a, and the read line elements 26a and 22a
Is configured so that an electric field is applied to the portion of the photoconductive layer 23 sandwiched between the two. The read line element 26a
However, the voltage may be applied to all the elements 22a, including the peripheral elements 26a of several lines.

The magnitude of the voltage of the power source 82 is set so that the potential gradient in the photoconductive layer 23 is 10 ⁶ V / cm or more so that an avalanche amplification action occurs in the photoconductive layer 23.

The current detection amplifier 81 includes the stimulable phosphor layer 1.
2 is detected when a charge generated by the photostimulated light L4 generated in Step 2 being incident on the photoconductive layer 23 is read out of the image reading unit 20, and is stored in the stimulable phosphor layer 12. It functions as an image signal obtaining means for obtaining an image signal according to the stored energy.

A located on the downstream side of the current detection circuit 80
The / D converter 86, the data correction unit 87, and the ROM table 88 are provided for correcting output data fluctuation caused by voltage fluctuation of the power supply 82. When the photoconductive layer 23 containing a-Se as a main component is used in an electric field for avalanche amplification, the photoconductive layer 23 becomes sensitive to power supply voltage fluctuation.
In addition to suppressing the power supply voltage fluctuation as much as possible and stabilizing the voltage, the power supply voltage fluctuation data relating to the fluctuation of the output data with respect to the power supply voltage fluctuation is acquired and stored in the ROM table 88, and the data correction unit 87 The power supply voltage fluctuation during reading (specifically, the voltage between the electrodes) is monitored, and the output data is corrected by, for example, software processing or the like according to the voltage fluctuation during image reading.

Hereinafter, in the recording and reading apparatus 110 having the above configuration, the subject 9 is irradiated with the radiation L1, the recording light L2 transmitted through the subject is irradiated on the detection sheet 1, and the radiation image information is recorded in the image recording unit 10. Then, a method of reading the recorded image radiation image information by the image recording unit 20 will be described with reference to a timing chart shown in FIG.

When recording radiation image information in the image recording section 10 of the detection sheet 1, the switch 83 is first turned off so that no electric field is applied to the photoconductive layer 23 of the image reading section 20. Instead of the switch 83, all the switching elements 84a of the switch unit 84 may be turned off.

Next, the radiation L1 is bombarded onto the subject 9, and the recording light L2 carrying the radiation image information of the subject 9 passing through the subject 9 is irradiated to the first electrode layer 21 side of the detection sheet 1 for about 1 second. The recording light L2 passes through the image reading unit 20 of the detection sheet 1 and enters the stimulable phosphor layer 12. The stimulable phosphor layer 12 accumulates energy according to the dose of the incident radiation. Thereby, the radiation image information is recorded in the image recording unit 10 of the detection sheet.

Next, the irradiation of the radiation L1 is stopped, and the switch 83 and the switch section 8 are read prior to reading.
4 is turned on, and a voltage is applied between the stripe electrodes 22 and 26 via the imaginary short of the operational amplifier 81a to apply a high electric field to the photoconductive layer 23.

Next, the excitation light L3 is relatively moved from one end to the other end in the longitudinal direction of the element 26a so as to correspond to the element 22a (corresponding to sub-scanning). At the scanning position, the excitation light L3 is emitted for a period of 100 μsec. At the time of this sub-scanning, the switching element 84a of the switch section 84 is sequentially switched in the longitudinal direction of the element 26a one by one (or a plurality of them) in synchronization with the sub-scanning of the excitation light L3, so as to be excited. The voltage is applied between the element 26a irradiated with the light L3, that is, only the element 26a of the read line, or the element 26a of the read line and its peripheral line, and all the elements 22a.
Is open. By doing this,
The distribution capacitance formed between the elements 22a and 26a is reduced, and the fixed noise can be extremely reduced. The current detection amplifier 8 is provided for each element 22a.
1 is connected and simultaneous reading can be performed in the main scanning direction, which is the arrangement direction of the elements 22a, so that the reading time of the photostimulated light L4 can be shortened.

The excitation light L3 is red light having a wavelength of 600 nm or more, and is incident on the stimulable phosphor layer 12 without being absorbed by the photoconductive layer 23 containing a-Se as a main component. Blue stimulable light L4 is emitted from the stimulable phosphor layer 12 to which the excitation light L3 is incident, and the stimulable light L4 is incident on the photoconductive layer 23. In the photoconductive layer 23, a positive / negative charge pair is generated by the irradiation of the stimulating light L4.

Further, both elements 22a, 22a of the read line
The photoconductive layer 23 between 26a⁶ High voltage over V / cm
Field is applied, and avalanche amplification works.
And the generation of positive / negative charge pairs in the photoconductive layer 23 rapidly
Increase. The quantum efficiency of the phosphor layer 12 is low, and the phosphor layer 1
Since the stimulated emission light L4 emitted from 2 is a low light quantity,
The amount of charge pairs generated by direct irradiation of
Number of photons), but has an avalanche amplification effect
Amplifying the amount of generated electric charge (charge multiplication)
Function) to generate a sufficiently large signal.
As a result, S / N can be improved.

Since an electric field is applied to the photoconductive layer 23, the negative charge of the generated charge pair is the element 22a.
Side, and the positive charges move to the element 26a side.

An operational amplifier 81a is provided between the two elements 22a and 26a.
The image signal is obtained by simultaneously detecting the electric current caused by the above-described movement of the electric charges generated by the sub-scanning of the excitation light L3 and the sequential switching of the switch unit 84 for each element 22a.
That is, the radiation image information can be read. Here, as described above, the photoconductive layer 2 mainly containing a-Se
3 is set to 1 μm or more and 100 μm or less, so that the avalanche using photomultiplier or Si has a quantum efficiency of 60 to 70% for photostimulated emission light, for example, blue light having a wavelength of about 400 nm. Since the reading can be performed by applying an electric field which causes an avalanche amplification effect to the photoconductive layer 23 and the power supply voltage fluctuation is corrected, the S / N ratio of the image can be significantly reduced. Can be improved.

Further, since the data correction section 87 and the ROM table 88 are provided to correct the output data fluctuation caused by the voltage fluctuation of the power supply 82, stable data can be obtained without being affected by the power supply voltage fluctuation. It is possible to further improve the S / N of the signal.

The photoconductive layer 2 containing a-Se as a main component
3, the ratio between the sensitivity to stimulated emission light having a wavelength of about 400 nm and the sensitivity to excitation light having a wavelength of about 600 to 700 nm can be sufficiently increased. For example, a-Se
When the avalanche amplifying action does not work when the film thickness is 10 μm, blue sensitivity (＠ 470 nm) / red sensitivity (＠ 68
0 nm) = approximately 3.5 digits. This value is very large as compared with about two digits when a photomultiplier is used as the photoelectric conversion means. The red sensitivity decreases as the a-Se film thickness decreases, and the blue / red sensitivity ratio further increases. Of course, when the avalanche amplification function is activated, the blue /
The red sensitivity ratio is even greater. Further, since Si has high sensitivity to red light and low sensitivity to blue light, there is a remarkable difference in that it is not suitable for use (poor matching) mainly in combination with photostimulated luminescent light emitting blue light.

Further, since the photoconductive layer 23 using a-Se and the stimulable phosphor layer 12 are combined, the detection sheet 1 can be solidified to have impact resistance.
Further, since the photoconductive layer 23 containing a-Se as a main component can be manufactured by stacking by low-temperature evaporation, the thin and large-area detection sheet 1 can be easily manufactured.

The detection sheet 1 uses the stimulable phosphor layer 12 which does not record a dark latent image upon irradiation with radiation, and the photoconductive layer 23 of the image reading section 20 is generated in the layer. Without the formation of a power storage unit to store electric charge,
Even if an electric field is applied to the photoconductive layer 23 during recording, the problem that a dark latent image is recorded by a dark current does not occur. In other words, the dark resistance is extremely higher than that of an avalanche photodiode using Si (for example, 10 ¹⁵ Ω · cm).
Above) can be. Even if a dark current is generated, the current is immediately discharged to the current detection amplifier 81 side, and the current detection amplifier 81 discharges the current, thereby eliminating the influence of the dark latent image.

As described above, the photoconductive layer 23
In addition to the stimulated emission light L4 emitted from the stimulable phosphor layer 12, the stimulable phosphor layer 12 is also electrically conductive by receiving radiation (recording light L2) or instantaneous light emitted from the stimulable phosphor layer 12 by the irradiation of the radiation. We use thing showing nature. Therefore, while applying an electric field to the photoconductive layer 23, the recording light
By irradiating the detection sheet 1 with L2, the recording light L2 and the instantaneous light are made to enter the photoconductive layer 23, and the charges generated in the photoconductive layer 23 are detected. It is also possible to obtain a pre-read image signal carrying radiation image information while recording. As a device for obtaining the pre-read image signal, the above-described recording and reading device 110 may be used, such as using the current detection circuit 80 as a pre-read image signal acquiring unit.
Can be used as it is. The obtained pre-read image signal can be used for setting image processing conditions at the time of main reading. Also, use it instead of a photo timer,
It is also possible to set the irradiation timing of radiation and to monitor the radiation dose.

When the recording / reading device 110 is used as it is for pre-reading, one-dimensional compression information integrated in the direction of the element 22a is obtained from each current detection amplifier 81 as pre-read information, so that it is not always sufficient. May not be information. In this case, for example, as shown in FIG. 5, the current detection circuit 80 is directly input from the element 22a to the inverting input terminal (-) of the operational amplifier 81a and the non-inverting input terminal (+) is set to ground (ground). (The capacitor 81b and the like are kept as they are) and, for example, an operational amplifier 281a corresponding to the operational amplifier 81a,
A signal detection amplifier 281 including an individual power supply 282a corresponding to the power supply 82, a switching element 284a corresponding to the switching element 84a, and a resistor 285a connected between an inverting input terminal (-) and an output terminal of the operational amplifier 281a is provided.
It is preferable to provide between each of the divided elements 26a and the ground (ground). As a result, the current 1 integrated by the current detection amplifier 81 in the direction of the element 22a.
In addition to the dimensional compression information, one-dimensional compression information integrated in a direction orthogonal to the length direction of the element 22a is obtained from each of the added signal detection amplifiers 281. This makes it possible to obtain more detailed prefetch information based on the two obtained one-dimensional compression information.

When the pre-reading and recording are completed and the main reading is performed, if the pre-reading image signal is unnecessary, it may be discharged. Also, this pre-read image signal,
The actual reading image signal obtained by the actual reading may be added.

Further, in the first embodiment, the stimulable phosphor layer 12 is provided on the second electrode layer 25 side of the image reading section 20.
The detection sheet 1 is formed by stacking the image recording unit 10 and the image reading unit 20 so as to face the recording light L2 and the excitation light L3.
Is described from the first electrode layer 21 side of the image reading unit 20, but the recording light L2 and the excitation light L3 may be irradiated from the base 11 side of the image recording unit 10.

When the excitation light L3 is irradiated from the first electrode layer 21 side, the stimulated emission light L4 emitted on the surface of the stimulable phosphor layer 12 can be detected. The image quality is better than that.

When the recording light L2 and the excitation light L3 are irradiated from the base 11 side, the stripe electrodes 2 of the image reading section 20 are irradiated.
The light can be incident on the stimulable phosphor layer 12 without passing through the phosphor layers 2 and 26, and the problem of artifacts due to the electrode matrix does not occur.

When the excitation light L 3 is irradiated from the base 11 side, an excitation light cut filter is provided between the stimulable phosphor layer 12 and the electrode layer 25, or between the electrode layer 25 and the photoconductive layer 23. It can also be inserted. In the above description, the red excitation light L3 is hardly absorbed by the photoconductive layer 23. However, actually, the red excitation light L3 is slightly sensitive to the red excitation light L3 having no image information. Therefore, an offset current corresponding to the minute electric charge generated by the excitation light L3 is generated. Therefore, when the excitation light cut filter is inserted as described above, blue light (around 400 nm) emitted from the stimulable phosphor layer 12 is transmitted and red light (600 nm) is emitted.
nm or more) so that only blue stimulated emission light can enter the photoconductive layer 23, so that the offset current can be suppressed.

The image recording section 1 is arranged such that the first electrode layer 21 side of the image reading section 20 faces the stimulable phosphor layer 12.
The detection sheet may be a stack of the image reading unit 20 and the image reading unit 20.

FIG. 6 is a view showing a schematic configuration of the radiation solid state detection sheet according to the second embodiment in the same manner as in FIG. 1C. Note that, in FIG. 6, the first
Elements that are the same as the elements of the detection sheet 1 according to the embodiment are denoted by the same reference numerals, and descriptions thereof will be omitted unless particularly necessary (the same applies to each embodiment described later).

The detection sheet 2 is further provided on the side of the base 11 of the detection sheet 1 and the second electrode layer 35 of the image reading section 30.
The image recording unit 10 and the image reading unit 30 are stacked so that the side faces the base 11. The base 11 is
It has transparency to the stimulating light L4. The structure of each layer of the image reading unit 30 is the same as that of the image reading unit 20 in which the reference numbers are changed from “30” to “20”. Note that the image reading unit 30 may be stacked such that the first electrode layer 31 side faces the base 11.

As in the first embodiment, the photoconductive layer 1
2 is a photostimulable light emitted from the stimulable phosphor layer 12
Not only L4 but also a material that exhibits conductivity by receiving radiation (recording light L2) or irradiation of instantaneous light emitted from the stimulable phosphor layer 12 by irradiation of the radiation (each embodiment to be described later) is used. In the same way).

As a recording / reading apparatus when using the detection sheet 2, a configuration may be employed in which a current detection circuit similar to the current detection circuit 80 is further provided on the image reading section 30 side in the apparatus 110 described above. The stimulated emission light L4 transmitted through the base 11 is also detected on the image reading unit 30 side, and the stimulated emission light L4 emitted from one stimulable phosphor layer 12 on both sides of the image recording unit 10 is detected. Based image signals are obtained independently of each other. By digitizing the two image signals for main reading obtained in this way and performing an addition process based on the two image data, the S / N can be improved.

As for the pre-read information, two pre-read image signals can be obtained by using the two current detection circuits 80 provided for the main read, so that an addition process is performed on the obtained two pre-read image signals. By doing so, a pre-read image signal with a good S / N can be obtained.

In this embodiment, an excitation light cut filter can also be inserted. For example, when irradiating the excitation light L3 from the image reading unit 30 side, the image reading unit 20 can be provided with an offset current suppressing effect by inserting the excitation light L3 into the same place as the detection sheet 1 described above. When the excitation light L3 is irradiated from the image reading unit 20 side, the stimulable phosphor layer 12 and the base 11,
And the second electrode layer 35, or between the second electrode layer 35 and the photoconductive layer 33, or by coloring the base 11 to absorb the excitation light L3, An offset current suppressing effect can be provided.

FIG. 7 is a diagram showing a schematic configuration of the radiation solid state detection sheet according to the third embodiment in the same manner as in FIG. 1C.

The detection sheet 3 includes the image recording unit 40 and the image reading unit 20 such that the stimulable phosphor layer 42 of the image recording unit 40 faces the first electrode layer 21 of the detection sheet 1. It is a laminate. It is assumed that the first electrode layer 21 of the image reading unit 20 has transparency to the stimulated emission light L4 emitted from the stimulable phosphor layer 42. For the structure of each layer of the image recording unit 40, reference numbers are changed from “40” to “1”.
This is the same as that of the image recording unit 10 replaced with the 0 "series. The base 41 of the image recording unit 40 is the first electrode layer 2
1 may be laminated.

As the recording / reading apparatus when using the detection sheet 3, the apparatus 110 using the detection sheet 1 described above can be used as it is. In addition, an excitation light cut filter is inserted between the stimulable phosphor layer 12 and the electrode layer 25 or between the electrode layer 25 and the photoconductive layer 23, and the stimulable phosphor layer 42 and the electrode layer 21 or the electrode. It is also possible to insert between the layer 21 and the photoconductive layer 23 to irradiate different excitation lights simultaneously from outside the image recording units 10 and 40.

Since the charges generated from the two stimulable phosphor layers 12 and 42 are detected, a pre-read image signal with a good S / N can be obtained.

FIG. 8 is a diagram showing a schematic configuration of a radiation solid state detection sheet according to the fourth embodiment in the same manner as in FIG.

The detection sheet 4 is configured such that the stripe electrode 26 of the second electrode layer 25 of the detection sheet 1 is
It has been changed to c. Note that the detection sheet according to the fourth embodiment can be a detection sheet having a structure in which a plurality of image recording units or image reading units are stacked, similarly to the detection sheets according to the above-described second and third embodiments.

A recording / reading apparatus using the detection sheet 4 is not shown, but the switch section 84 of the current detection circuit 80 is removed, and the plate electrode 26c and the power supply 8 are removed.
2 is a current detection circuit having a configuration in which the negative electrode side is directly connected.
At the time of reading, it is different in that the switching element 84a is not sequentially switched in conjunction with the scanning of the excitation light L3, but the other operation is the same as that of the device 110 described above.

When this detection sheet 4 is used, there is no need to switch the switching element 84a, so that there is no influence of switching noise.

It is needless to say that one of the electrode layers sandwiching the photoconductive layer 23 is the flat plate electrode 26c, so that the embodiment shown in FIG. 5 cannot be adopted in order to improve the pre-read accuracy.

FIG. 9 is a diagram showing a schematic configuration of a radiation solid detection sheet according to the fifth embodiment in the same manner as in FIG.

The detection sheet 5 is formed by connecting the stripe electrodes 26 of the second electrode layer 25 of the detection sheet 1 to the plate electrodes 26c.
And the stripe electrode 2 of the first electrode layer 21
2 is changed to a plate electrode 22c. Note that the detection sheet used in the fifth embodiment may be a detection sheet having a structure in which a plurality of image recording units or image reading units are stacked, similarly to the detection sheets of the second and third embodiments described above. it can.

FIG. 10 is a schematic configuration diagram of a recording / reading apparatus 120 using the detection sheet 5 and is a diagram showing the detection sheet 5 along with an XZ sectional view of a portion indicated by an arrow Q in FIG.

The current detection circuit 80 of the recording / reading apparatus 110 has a large number of current detection amplifiers 81 corresponding to the elements 22a. Is provided with only one current detection amplifier 81. The connection relationship between the current detection amplifier 81 and other components is the same as that in the current detection circuit 80 described above. As in the case where the detection sheet 4 is used, the one corresponding to the switch section 84 of the current detection circuit 80 is not provided, and the voltage application having a configuration in which the plate electrode 26c is directly connected to the negative electrode side of the power supply 82 is not provided. This is means 85a. In each of the embodiments described below (in a separate configuration), the current detection circuit 8
Portions related to the same configuration as that of Oa are shown in the simplified diagram shown in the figure.

The excitation light irradiating means 93 has a
An excitation light source 93a that emits red beam excitation light having a wavelength of m or more is used. This excitation light irradiation means 93
Is to scan and expose the entire surface of the plate electrode 22c with the beam-like excitation light L3 '. As the excitation light irradiation means 93, a laser scanning optical system can be used. Also,
A planar light source, such as a liquid crystal or an organic EL, in which minute point light sources are arranged in a plane, is integrally formed with the detection sheet 5, and the minute point light sources are electrically scanned, that is, the minute point light sources are sequentially switched. Thus, the entire surface of the plate electrode 22c may be irradiated. Further, the excitation light L3 ′ may be continuous light or pulsed light.

The line light scanning in each of the embodiments described above may be replaced with a method of performing scanning exposure using the beam-like excitation light L3 '.

Next, a method of reading out the radiation image information recorded on the image recording unit 10 of the detection sheet 5 by the image recording unit 20 will be briefly described, in that the method is different from the case where the detection sheet 1 is used. The image recording unit 1
The method of recording the radiation image information at 0 is the same as the case where the detection sheet 1 is used.

When reading the radiation image information from the detection sheet 5, first, the switch 83 is turned on, and the two flat electrodes 2 are connected via the imaginary short of the operational amplifier 81a.
A voltage is applied between 2c and 26c to apply an electric field to photoconductive layer 23.

Next, while the high electric field is applied to the photoconductive layer 23, the entire surface of the plate electrode 22c is scanned with the beam-like excitation light L3 '.

By the scanning exposure of the excitation light L3 ', the stimulable phosphor layer 12 on which the excitation light L3' corresponding to the scanning position is incident.
The photostimulated luminescence light L4 is emitted from the light source, and the photostimulated luminescence light L4 is incident on the photoconductive layer 23. Then, positive and negative charge pairs are generated in the photoconductive layer 23.

Next, as in the case of using the detection sheet 1 described above, the current flowing through the imaginary short of the operational amplifier 81a is detected by the current detection amplifier 81 to obtain an image signal carrying radiation image information.

The photoconductive layer 23 has 10 ⁶ V / cm.
The two flat electrodes 22c, 2c are so generated as to generate the above high electric field.
If a voltage is applied between 6c, a sufficiently large signal can be obtained by avalanche amplification.

In this embodiment, two-dimensional compressed information integrated by the flat electrode is obtained from the current detection amplifier 81 as pre-read information in accordance with the bombardment during image recording.

The preferred embodiments of the recording / reading apparatus as the image information reading apparatus for implementing the image information reading method of the present invention and the radiation image detecting sheet used in the recording / reading apparatus have been described. The invention is not limited to the above-described embodiment, and various changes can be made without changing the gist of the invention.

FIG. 11 is a diagram showing an example of a combination of modified forms of the radiation image detection sheet used in the image information reading method of the present invention. Radiation image detection sheet, shown, the variation of each element constituting the detection sheet,
One detection sheet can be formed by combining them arbitrarily. In addition, since the recording / reading device can also select various modes of radiation and excitation light, a suitable detection sheet can be used in combination with a detection sheet in accordance with a use application and a use form. For example, if the image recording unit is 2
Layer and insert an energy absorbing member between them,
Further, if the detection sheet has a configuration in which two image reading units are provided so that stimulated emission light from each image recording unit is independently incident, energy subtraction processing can be performed.

The variation shown in FIG. 10 is an example, and it is a matter of course that other changes can be made. For example, the base of the image recording unit may be removed, and the stimulable phosphor layer may be laminated on the image reading unit. Note that, in any of the modified embodiments, similarly to the above, the photoconductive layer includes not only the stimulated emission light L4 emitted from the stimulable phosphor layer but also radiation (recording light L2) or irradiation of the radiation. In addition to using a material that exhibits conductivity even when it is irradiated with instantaneous light emitted from the stimulable phosphor layer, at the time of image recording, a charge generated in the photoconductive layer is detected to obtain a pre-read image signal. I do.

In the above description, a pre-read image signal is obtained using an image recording unit and an image reading unit, more specifically, a radiation image detection sheet in which a stimulable phosphor sheet and a solid-state image detector are integrated. Although the embodiment described above has been described, the invention is not necessarily limited to the integral structure, and may be a separate structure. In this case, in each of the above-described embodiments, the stimulable phosphor sheet (image detection sheet) and the solid-state image detector have a one-to-one correspondence with only a space provided between the image recording unit and the image reading unit. (With substantially the same area).

In the case where the image detection sheet and the solid-state image detector are provided separately, the solid-state image detector is not limited to a two-dimensional detector having substantially the same area as the image recording sheet. Shape) or a zero-dimensional detector (elongated or smaller in area than the sheet). When a one-dimensional detector or a zero-dimensional detector is used, information on substantially the entire surface of the image recording sheet can be obtained during irradiation of recording light.
It is desirable to move the solid-state image detector relative to the sheet faster than at the time of main reading to obtain a pre-read image signal.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a schematic configuration of a first embodiment of a radiation image detection sheet which is an embodiment of a solid-state image detector used in a recording and reading apparatus to which the present invention is applied, Cross section (B), XZ cross section (C)

FIG. 2 is a diagram showing a schematic configuration of a recording and reading apparatus using the radiation image detection sheet according to the first embodiment (part 1);

FIG. 3 is a diagram illustrating a schematic configuration of a recording and reading apparatus using the radiation image detection sheet according to the first embodiment (part 2);

FIG. 4 is a timing chart illustrating a method for recording and reading radiation image information using the radiation image detection sheet according to the first embodiment.

FIG. 5 is a diagram showing a schematic configuration showing a change mode of a recording / reading apparatus corresponding to pre-reading;

FIG. 6 is an XZ cross-sectional view illustrating a schematic configuration of a radiation image detection sheet according to a second embodiment.

FIG. 7 is an XZ sectional view showing a schematic configuration of a radiation image detection sheet according to a third embodiment.

FIG. 8A is a perspective view showing a schematic configuration of a radiation image detection sheet according to a fourth embodiment, FIG.
XZ sectional view of Q arrow finger part (C)

FIG. 9 is a perspective view (A) showing a schematic configuration of a radiation image detection sheet according to a fifth embodiment, an XY cross-sectional view of an arrow P part (B),
XZ sectional view of Q arrow finger part (C)

FIG. 10 is a diagram illustrating a schematic configuration of a recording and reading apparatus using a radiation image detection sheet according to a fifth embodiment.

FIG. 11 is a diagram showing a combination example of a change mode of a radiation image detection sheet.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 radiation image detection sheet 10 image recording section (image recording sheet) 11 base (support) 12 stimulable phosphor layer 20 image reading section (solid image detector) 21 first electrode layer 22 first stripe electrode 23 photoconductive layer 25 second electrode layer 26 second stripe electrode 80 current detection circuit (also used as pre-read image signal acquisition means) 81 current detection amplifier (image signal acquisition means) 85 voltage application means 90 radiation irradiation means 92,93 excitation light irradiation means 110, 120 Radiation image recording and reading device L2 Radiation for recording (recording light) L3 Excitation light L4 Stimulated emission light

Claims (6)

[Claims] 1. An image recording sheet having a stimulable phosphor layer for generating stimulated emission light in an amount corresponding to energy stored by receiving irradiation with excitation light, and receiving the irradiation with the stimulated emission light. Using a solid-state image detector having a photoconductive layer exhibiting conductivity, the photostimulable emission light obtained by scanning the image recording sheet on which image information is recorded with excitation light is used as the photoconductive layer. An image information reading method for obtaining an image signal carrying the image information by causing light to enter the layer and detecting an electric charge generated in the photoconductive layer with the incidence by applying an electric field to the photoconductive layer. As the solid-state image detector, the photoconductive layer exhibits conductivity by receiving recording light carrying the image information or instantaneous light emitted from the stimulable phosphor layer by irradiation of the recording light. Irradiating the image recording sheet with the recording light while applying an electric field to the photoconductive layer so that the recording light or the instantaneous light is incident on the photoconductive layer; Detecting a charge generated in the step (a) to obtain a pre-read image signal carrying the image information. 2. The solid-state image detector includes two electrode layers having electrodes stacked so as to sandwich the photoconductive layer, and an electrode of one of the two electrode layers is provided. Using a stripe electrode formed by arranging a large number of linear electrodes, and generating the electric charge generated in the photoconductive layer when the recording light or the instantaneous light is incident on the photoconductive layer. 2. The image information reading method according to claim 1, wherein the detection is performed for each linear electrode of the electrode layer. 3. The solid-state image detector, wherein a linear electrode is disposed such that an electrode of the other electrode layer of the two electrode layers intersects each linear electrode of the one electrode layer. Using a stripe electrode formed by arranging a large number of electrodes, the charge generated in the photoconductive layer when the recording light or the instantaneous light is incident on the photoconductive layer, the other electrode layer 3. The image information reading method according to claim 2, wherein the detection is also performed for each of the linear electrodes. 4. An image recording apparatus having an excitation light source that emits excitation light, and having a stimulable phosphor layer that generates stimulated emission light in an amount corresponding to energy stored by being irradiated with the excitation light. Excitation light scanning means for scanning a sheet with the excitation light, a solid-state image detector having a photoconductive layer exhibiting conductivity by being irradiated with the stimulating light, and the photoconductive layer of the solid-state image detector Voltage applying means for applying a voltage for generating an electric field therein, and stimulating light emitted by scanning the image recording sheet on which image information is recorded with the excitation light is incident on the photoconductive layer. An image signal obtaining unit that obtains an image signal carrying the image information by detecting an electric charge generated in the photoconductive layer by applying an electric field to the photoconductive layer. , Previous The photoconductive layer of the solid-state image detector exhibits conductivity by receiving recording light carrying the image information or instantaneous light emitted from the stimulable phosphor layer by irradiation of the recording light. Detecting the charge generated in the photoconductive layer by the recording light or the instantaneous light being incident on the photoconductive layer,
An image information reading apparatus, further comprising a prefetch image signal acquisition unit for obtaining a prefetch image signal carrying the image information. 5. The solid-state image detector has two electrode layers having electrodes stacked so as to sandwich the photoconductive layer, and the electrode of one of the two electrode layers is A plurality of linear electrodes are arranged in a stripe electrode, wherein the pre-read image signal acquiring means is arranged in the photoconductive layer when the recording light or the instantaneous light is incident on the photoconductive layer. 5. The image information reading device according to claim 4, wherein the generated charges are detected for each linear electrode of said one electrode layer. 6. The solid-state image detector according to claim 1, wherein the linear electrode is arranged such that an electrode of the other electrode layer of the two electrode layers intersects with each linear electrode of the one electrode layer. A stripe electrode formed by arranging a large number of electrodes, wherein the pre-read image signal acquiring unit is configured to generate a charge in the photoconductive layer when the recording light or the instantaneous light is incident on the photoconductive layer. The image information reading device according to claim 1, wherein the image information is also detected for each linear electrode of the other electrode layer.