JPS58223869A - Detecting and reconstituting device of radiation image - Google Patents

Abstract

PURPOSE:To increase the quantity of radiation per unit detecting element and to improve the S/N ratio, by using a slip-shaped detecting element in order to increase the quantity of radiation that is made incident to the unit detecting elements forming a detector and then decreasing the number of divisions of a screen. CONSTITUTION:The image of a object radiation image source 1 is projected on a radiation detector 4 stored in a camera assembly 5 via a slit 2 of a slit plate 52 provided in front of the assembly 5. The detector 4 contains numbers of slip- shaped radiation detecting elements which are set in parallel to the slit 2 and is fixed to a support face 51 of the detector 4 which is set at the rear side of the assembly 5. Thus the detector 4 can turn together with the slit 2. The output signal of each detecting element of the detector 4 is stored with each rotating position of the detector 4. Then the quantity of radiation is calculated from the stored signal for the picture element related to the detecting element. Thus the image of the source 1 is reconstituted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention projects radiation from a radiation image source onto a radiation detector through a slit, detects the projected image, and processes the data obtained. The present invention relates to a radiation image detection and reconstruction device that reconstructs an image of.

Conventional radiation image detection and reconstruction devices form a radiation image through a pinhole on a radiation detector in which a number of radiation detection elements corresponding to the number of pixels are arranged, and process the output of each radiation detection element. Accordingly, the radiation image is reconstructed.

In this type of device, the area of the pinhole cannot be increased, so it is difficult to increase the amount of radiation that reaches the radiation detector via the pinhole.

Further, the amount of radiation incident on each radiation detecting element that is a component of the radiation detector is only 1/1 of the total number of pixels of the energy of the entire radiation image.

As mentioned above, the amount of radiation incident on each radiation detection element is extremely small, so the signal-to-noise ratio of the pixel signal is small.
It was difficult to obtain a clear reconstructed image. That is,
In this type of device, increasing the number of pixels and increasing the signal-to-noise ratio of the output signal of each radiation detection element are contradictory demands, and it is impossible to satisfy both at the same time. .

An object of the present invention is to provide a radiation image detection apparatus that solves the above-mentioned problems.

- In order to achieve the above object, the inventor of the present invention (a) reduces the number of screen divisions in order to increase the amount of radiation incident on a unit detection element, thereby increasing the signal-to-noise ratio per unit detection element; (b) Reconfiguring the image and increasing the image resolution unit by changing the position of the detection element with respect to the radiation image and performing arithmetic processing on the signals obtained by detecting signals from the same element multiple times. Being able to do something, (c)
We focused on using other apertures that can obtain a larger incident radiation dose than a pinhole and are suitable for subsequent calculation processing.

That is, the radiation image detection and reconstruction device according to the present invention includes a shielding plate having a slit, and a large number of rectangular radiation detection elements arranged parallel to each other in a plane parallel to the shielding plate having the slit. a radiation detector formed of a radiation detector; a rotation device that intermittently rotates the shielding plate and the radiation detector at equal angular pitches about a common axis perpendicular to each; a storage device for storing an output signal for each rotational position of the intermittent rotation, and an image given to a pixel associated with the detection element for each detection element at each rotational position obtained from the data stored in the storage device. Assuming that the influence is determined only by the degree to which the detection element and the pixel overlap, a temporary radiation amount of the related pixel is calculated, and further calculations are performed using these temporary radiation amounts to reconstruct the radiation image. It includes a calculation device and an output device that outputs calculation results of the calculation device, and is configured to reconstruct an image of a radiation image source from a radiation image transmitted through the slit and projected onto a radiation detector.

According to the above structure, the object of the present invention can be completely achieved. Note that the object of the apparatus according to the present invention may be either one that itself emits radiation, or one that reflects or transmits radiation after being irradiated with it.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus according to the present invention will be described in further detail below with reference to drawings showing embodiments.

FIG. 1 is a perspective view showing the positional relationship among a radiation image source, a slit, and a radiation detector in a radiation image detection and reconstruction apparatus according to the present invention.

The image of the object radiation image source l passes through the slit 2 provided in the slit plate 52 on the front of the dark box assembly 5.
is projected onto a radiation detector 4 housed within. The radiation detector 4 is fixed to a radiation detector support surface 51 on the rear surface of the dark box assembly 5, and is rotatable together with the slit 2.

FIG. 2 is a diagram of the radiation detector 4 viewed from the radiation incident side. The radiation detector includes a radiation detection element 401.4
02, 40h, 413, 414 are arranged close to each other in parallel with both ends aligned.

A square detection surface S is formed by a collection of the 14 radiation detection elements.

The radiation detection element is constructed using a single silicon substrate using planar technology, and each radiation detection element is constructed by doping one surface of an N-type silicon substrate with P-type impurities.
-N junction semiconductor. A common electrode 42 is connected to the back surface of the detection surface S formed by the 14 radiation detection elements,
The radiation detection elements 401402, . . . 413, 414 have individual electrodes 401a, 402a, .
413a and 414a. Each individual electric 140
L, a, 402a, ・ ・ ・ 413a, 41
4a is a conductive wire that passes through the base and is connected to the terminal on the back side.
They are sequentially connected to the input terminals of the amplifier group 15 shown in the figure.

A gear 54 is integrally provided on the outer periphery of the cylindrical wall 53 of the dark box assembly 50. This gear 54 is coupled to a drive gear 55 that transmits the output of a pulse motor 56. The dark box assembly 5 rotates around the central axis by the rotation of the pulse motor 56.
It can be rotated up to 180 degrees in 5 degree increments.

Here, the relationship between the screen and the detector in the present invention will be explained. In this invention, the screen is a region of a radiation image that can be reconstructed, and is determined by the relationship with the detector 4, but is not the detection surface itself. The screen is formed from an area included in a circle inscribed in the detection surface.

Fig. 4 is an explanatory diagram showing the relationship between the radiation detector and the screen, where Fig. 4A shows the initial positional relationship between the radiation detection element and the screen, and Fig. 4B shows the situation when the detector is rotated by 45°. Figure 4C shows the screen when the detector is rotated 90 degrees, and as shown in each figure, the detector 4 and the slit 2 rotate together, but the line M The enclosed screen is immobile.

A square inscribed in a circle inscribed in a square formed by the array of radiation detection elements 401,402...414 is defined as a screen, and the number of pixels on one side is IO, 10X10=100
It is assumed that this is established from the pixels of .

Generally speaking, when a square detection surface is defined by P strips, the center of the screen coincides with the center of the detection surface S, and the length of the diagonal is less than or equal to the length of one side of the detection surface S. , the number of pixels is (PXP)/2 or less.

Figure 4A shows radiation detection elements 401, 402...41
FIG. 4 is an explanatory diagram for explaining the initial position of the detection surface formed by the detector 4 (the position before the detector 4 starts rotating), the screen, and the geometric relationship between the pixels. FIG. 4B is an explanatory diagram showing the geometric relationship between the detection surface, screen, and pixels when the detector 4 is rotated by 45 degrees, and FIG.
FIG. 3 is an explanatory diagram showing the geometric relationship between a detection surface, a screen, and pixels when rotated by 0°.

The outside of the thick line indicated as M in each figure is covered with a material that blocks radiation. This thick line matches the outline of the screen, and the radiation detection elements 401, 402...41
Only the portion located within the screen of 4 contributes to energy conversion.

In FIG. 4, the vertical arrangement of pixels is referred to as pixel columns, and the horizontal arrangement of pixels is referred to as pixel rows. Therefore, the radiation detection elements 401, 402 and 402 included in the detection plane S are
. . 414 is parallel to the pixel column in its initial position.

FIG. 3 is a block diagram showing an embodiment of the control of the radiation detector 4 and the signal processing device.

A control terminal 71 of the controller 7 outputs a rotation instruction signal to the pulse motor 56 . Based on this rotation instruction signal, the pulse motor 56 rotates the radiation detector 4 by 15 degrees. A continuation instruction signal is sent from the control terminal 72 of the controller 70 to the serialization device 8 .

The serialization device 8 is composed of individual sample and hold circuits connected to each output terminal of the amplifier group 15, and a gate circuit that takes out the signals of the individual sample and hold circuits.

A write address signal is sent from the control terminal 73 of the controller 7 to the first storage device 10 .

The first storage device 10 has 12
X14=168 memory locations are provided. The address signal sent from the controller 7 to the first storage device 1O is a signal having a two-dimensional array consisting of a combination of a signal sent to the pulse motor 56 and a signal sent to the serialization device 8. That is, the signal instructing the rotation angle to be sent to the pulse motor 56 corresponds to the signal specifying the row of the two-dimensional array of storage locations in the first storage device 10, and the signal input from a specific input terminal of the serialization device 8 corresponds to the signal instructing the rotation angle sent to the pulse motor 56. The signal instructing to send out corresponds to the signal instructing the column of storage locations in the first storage device IO.

Therefore, the storage location at address (m, n) of the first storage device 10 is converted into a digital signal by the m-th analog-to-digital converter 9, and is converted into a digital signal at the storage location (m, n) of the first storage device W10.
n) Stored at address.

FIG. 5 shows an explanatory diagram of the first storage device 1o. The storage location of the output of the detector 4 in each step will be explained in detail with reference to this explanatory diagram.

When the radiation detector 4 is at the 0° position shown in FIG. 4A, the output from each radiation detection element 401, 402, . -1
, 2nd line, F2-1, ... 14th line, F 14
-1 is stored. Hereinafter, Fi-j will be used to indicate the location of the i-th row and j-column of the first storage device 9, and (Fi-j) will indicate the data stored in that location.

When the radiation detector 4 is rotated by 15 degrees, the output from each radiation detection element 401, 402, .

F 1-2, 2nd line, F2-2...14th line, F
It is stored in l4-2.

Each radiation detection element 401, 402...414 when the radiation detector 4 is rotated by 30 degrees
Their outputs are in the first row of the third column of the first storage device 10.

1 F 1-3, 2nd line, F2-3, ... 14th line,
It is stored in Fl4-3.

Similarly, when the radiation detector 4 is rotated 90' as shown in FIG. 4C, each radiation detection element 401, 402...
. . 414 are stored in the 7th column, first row, Fl-7, second row, F2-7, .

Similarly, when the radiation detector 4 is rotated by 165 degrees, the output from each radiation detection element 401, 402...414 is in the first row of the 12th column of the first storage device 1o.
-12, 2nd line, F2-12, ... 14th line,
It is stored in Fl4-12.

Next, the calculations of the computer 11 will be explained.

The computing device 11 computes and reconstructs the image of the radiation image source from the data stored in the first storage device 10 as described above. The image formed on the radiation detector 4 or the screen differs depending on the angle of the slit 2. The reason why the image of the radiation image source can be computationally reconstructed from such a projection image and the algorithm for image reconstruction will be explained.

The slit 2 can be thought of as a collection of small pinholes. In FIG. 1, radiation from a radiation image source 1 connects a slit 2. The light that passes through the part forms an image of Ho on the screen. Similarly, the slit 2 is exposed to radiation from the radiation image source l.
The light that passes through the hl portion of forms an image of H on the screen. Further, the light passing through the h2 portion forms an H2 image on the screen.

The radiation image formed on the screen in this way can be considered to be a collection of many images. It can be seen that this image is blurred in the direction parallel to the slit 2, but resolved in the direction perpendicular to the slit 2.

Since the radiation detector 4 rotates together with the slit, the radiation detection elements are arranged in the resolution direction.

FIG. 6 is a schematic diagram for explaining the principle of the device according to the present invention, and for easy understanding, the pixels are R1-I.
R1-2R2-I 4 R2-2, 40 detection elements
An example will be shown in which it is formed from four items: 2.402.403.404. The radiation image source is S 1-1S 1-232
-I S 2-2.

6A shows the dark box assembly 5 in its original position, FIG. 6 B shows the dark box assembly 5 in a 45-degree rotated position, and FIG. 6 C shows the dark box assembly 5 in a 90-degree rotated position from its original position. There is.

When the dark box assembly 5 of FIG. 6A is in its original position, the radiation image source 82-2 is made to correspond to the pixels R1-2 and R2-2 by the slit 2. Similarly, 8 of the radiation image source
1-2 is connected to pixel R1-2 and pixel R2- by slit 2.
2. The radiation detection element 403 will send outputs due to radiation image sources 82-2 and 81-2.

The radiation image source 82-1 is connected to the pixel R1- by the slit 2.
1 and pixel R2-1. Similarly, the radiation image source 31-1 is made to correspond to the pixel R1-1 and the pixel R2-1 by the slit 2. The radiation detection element 402 sends out outputs caused by radiation images 32-1 and 81-1.

The output of the radiation detection element 403 or 1/2 thereof is used as temporary pixels of pixels Rl-2 and R2-2, and the radiation detection element 402
The output, or 1/2 thereof, is stored as a temporary pixel of pixels R2=1 and R1-1.

When the dark box assembly 5 in FIG.
Accordingly, the pixel R2-1 and the pixel R2-2 are made to correspond to each other. Similarly, the radiation image source 82-1 is made to correspond to the pixel R2-1 and the pixel R2-2 by the slit 2. The radiation detection element 403 will send outputs due to radiation image sources 82-2 and 32-1.

The radiation image source 81-2 is connected to the pixel R1- by the slit 2.
1 and pixel R1-2. Similarly, the radiation image source 31-1 is made to correspond to the pixel R1-1 and the pixel R1-2 by the slit 2. The radiation detection element 402 will send outputs caused by the radiation image source 31-2 and S L-1.

The output of the radiation detection element 403 or its I/2 is used as temporary pixels of pixels R2-1 and R2-2, a radiation detector,
The output of the child 402, or 1/2 of it, is the pixel R1
-2 and R1-1 are stored as temporary galleries.

When the dark box assembly 5 in FIG. 6B is in a position rotated by 45 degrees from its original position, the situation is slightly more complicated than the above case.
By taking into consideration the decomposition in the direction perpendicular to the slit 2 and the overlap between each detection element and the pixel, a temporary pixel can be determined from the output of each radiation detection element.

The radiation detection element 401 is a temporary pixel of pixel R1-1,
The radiation detection element 402 has pixels R1-IRI-2R2
-1 temporary pixel, radiation detection element 403 is pixel R2
-2R1-2R2-1 temporary pixel, radiation detection element 40
4, a temporary pixel of pixel R2-2 can be found.

The computing machine can reconstruct the radiation image source by averaging the temporary pixels obtained in this way for each pixel.

Next, the data stored in each location of the first storage device 1o of the above-described embodiment and the temporary radiation dose of each pixel calculated from the data will be explained.
,,.

The true radiation dose incident on the pixels ■ to J defined by any row i and any column j of the screen shown in FIG.
shall be.

At this time, it is generally necessary to consider the following conditions (in a case corresponding to FIG. 6B).

(a) It is rare that one pixel is completely included in one radiation detection element, and the radiation incident on one pixel is received by two or more energized radiation detection elements.

(b) The degree of area overlap between one pixel and the radiation detection element is determined by the inclination of the detector 4.

The data in the first row and column of the first storage device 9 is (Fh-k
).

(Fh-k) is the th angular position (k
-1) This is data corresponding to the total radiation dose incident on the h-th radiation detection element 40h at X15°.

Let K ij be the overlap ratio of an arbitrary pixel -J that overlaps with the radiation detection element 40h and the radiation detection element 40h. K ij is a constant that is uniquely determined once the radiation detection element, its inclination, and the pixel are determined.

(When all the radiation incident on any pixel 1-J is captured by the radiation detection element 40h and completely overlaps)
The K ij is l, and the K ij is 0 when the radiation incident on any pixel 1-J is not captured at all by the radiation detection element 40h (when they do not overlap at all).

Therefore, the radiation dose given to the radiation detection element 40h from the region of the arbitrary pixel 1-J is (Ri-j) x (
Ki-j). (Fh-k) is radiation detection element 4
Since it is given by the sum of the radiation doses for all pixels that overlap with 0h, (F h-k ) is given by the following equation.

(Fh-k)=Σ(Ri-j) x (K i-j
) From this (Fh-k), assuming that Ri-j of each pixel related to the radiation detection element 40h is all equal, determine the provisional radiation dose (Ri-j) h-k of each pixel as follows. .

(Ri-j) h-k = (F h-k) /Σ
(Ki-j) Next, consider the temporary radiation dose corresponding to the data stored in the first column of the first storage device 9.

(Fl-1) = O (The detection element 401 is not on the screen, so no data is input.) (F2-1) = 0 (The detection element 402 is also not on the screen, so no data is input.) (F3-1) = R1-1+R2-1+R3-1+R
4-1+...+R9-1+ R10-1 (K1-1
=1) (F4-1) =R1-2+R2-2+R3-
2+R4-2+...+R10-2 (K1-2
=1)(F12-1) = R1-10+ R2-1
0+ R3-10+...+R10-10 (K
1-10=1) Since the detection element 411 and the detection element 412 are not on the screen, there is no input in (F13-1) and (F14-1).

From these data at the 0° position, a tentative radiation dose for each pixel can be determined. Since data corresponding to the sum of the radiation doses of 10 pixel bones is stored in F3-1 etc., (F3-1) /10 = (R1~1) 3-1
= (R2-1)1 3-1 = (R
3-1) 3-1 = (R4-1) ... = (RI
G-1) Let this be the provisional radiation dose of each pixel forming the first column as 3-1.

However, 10=ΣK1-1, similarly (F4-1) /10 = (R1-2) 4-1
= (R2-2)4-1 = (R3-234-1=
(R4-2) 4-1...=(R1O-2) 4-1
Let this be the provisional radiation dose for each pixel constituting the second column.

(F12-1) /10 = (R1-2) 12-1
= (R2-2)12-1= (R3-2) 12-1
= (R4-2) ... = (RIO-2) 12-1
Let this be the provisional radiation dose for each pixel constituting the 10th column.

The data in each row of the seventh column of the first storage device 9 (corresponding to the data at the 90° rotational position of the detector 4) corresponds to the data in a row of pixels.

(Fl-7) =O (detection element 401 is not on the screen) (
F2-7) = 0 (Detection element 402 is also not on the screen) (
F3-7) =R1-1+R1-2+R1-3+...
...+R1-10 (Kl-j = 1) (F4-7) = R2-1+R2-2+R2-3...+
R2-10 (K2-j = 1) Similarly (F 12-7) = R10-1+ R10-2+
R10-3...+RIO-10 (K 1O-j= 1
) (F 13-7) = (F 14-7) = O.

From these data at the 90' position, a provisional radiation dose for each pixel can be determined in the same manner as described above.

(F3-7) /10 = (R1-1) 3-7
= (R1-2) 3-7 = (R1-3) 3-7
= (R1-4) 3-7 =・・・・・・・・・=
(Assign R1-1033-7 to the first position at 90° position.
This is the provisional radiation dose for each pixel composing the row.

(F4-7) /10 = (R2-1) 4-7
= (R2-2) 4-7 = (R2-3) 4-7
= (R2-4) 4-7 =----・・・・・・= (
R2-10) Set this as 4-7 to the second position at 90°.
This is the provisional radiation dose for each pixel composing the row.

Similarly, (F 12-7) / 10 = (R1O-1) 1
2-7= (R1O-2)12-7= (R1O-3)
12-7= (R1O-4) 12-7=・・・・・・
... = (RIO-2) 90° as 12-7
Let this be the provisional radiation dose of each pixel constituting the 1st O row at the position.

Next, the second to sixth columns of the first storage device 10 (the angle of the detector is 1
5°, 30°, 45°, 60° and 75°) columns 8 to 12 (data when the detector angle is 105°, 120
135', 150°, and 165°)), the tentative radiation dose of each pixel is calculated from the data stored in each row of the data at the angular position (k- 1) Data corresponding to the total radiation dose incident on the h-th radiation detection element 4oh at X15° (Fh-
k), the provisional radiation dose of any pixel 1-J overlapping with the radiation detection element 40h can be similarly determined according to the procedure.

Calculation of the temporary radiation dose of each pixel as described above and calculation of the incident radiation dose of each pixel from the temporary radiation dose described later are performed by the computing device 11.

The radiation dose of each pixel, which is the basis for image reconstruction, is obtained by calculating the arithmetic mean of all the temporary radiation doses of that pixel obtained for each pixel.

Instead of the above calculation, the incident radiation dose of the pixel can be represented by the value that minimizes the mean square error of all the hypothetical radiation doses of the pixel.

The radiation dose of each pixel calculated in this way is stored in the second storage device 12 at each address provided corresponding to each pixel, as described above.

The pixel signals stored in the second storage device 12 are successively output according to the scanning method of the display device 14, and are converted into analog signals by the digital-to-analog converter 13. A display device 13 displays the output. A television monitor device or a tone printer can be used as this display device.

The embodiments described in detail above are explained in order to facilitate understanding.
A relatively simple example is shown in which there are 14 radiation detection elements and the number of rotation steps is 12 steps of 15 degrees.

Generally speaking, the number of pixels can be increased by increasing the number of radiation detection elements and the number of steps.

, + (7) ``''''1 item 8 inches 1 inch 2 hours * (7) Bit, IN km k tB.

Size of radiation detection element: 0, 8 mm x 30
ll1m Total number of elements: 30 Base outer diameter: 68 mm The radiation detection element is made by implanting phosphorus into P-type silicon to form a PN junction layer parallel to the incident surface, and the bias current, EEIOV, load When set to IKΩ, the response speed is 3 microseconds, and the radiation sensitivity is several hundred milliamperes/watt.

As explained in detail above, in the present invention, in order to increase the amount of radiation incident on the unit detection element forming the detector, a rectangular detection element is used and the number of screen divisions is reduced, so that the unit detection By increasing the incident radiation dose per element, the signal-to-noise ratio can be increased.

Furthermore, since the radiation detector is rotated and the position of the detection element is changed with respect to the radiation image, signals are obtained multiple times from the same element. By reconstructing the image, the image decomposition unit can be increased.

In the conventional device, 100 detection elements are required to obtain 100 pixels, but in the simple embodiment described above, 100 pixels are achieved with 14 detection elements. The number of amplifiers for amplifying the output of the detection elements is equal to the number of detection elements, and in the case of the above-mentioned simple embodiment, there are 14 amplifiers.

Comparison of the case where 100 detection elements are used to obtain 100 pixels and the case where 14 detection elements are used to obtain 100 pixels (in the case of a simple embodiment of the present invention) Then, in the case of the present invention, 100/14# per element
Since seven times the radiation dose can be received, the signal-to-noise ratio can be improved by 2.6, which corresponds to the square root of seven.

Various modifications can be made to the embodiments described in detail above within the scope of the present invention.

In the embodiment described above, the shape of the screen is square so that the radiation detector covers the screen at all rotation angles, but the screen does not necessarily have to be square. Furthermore, there is no need for the radiation detector to cover the screen at all rotation angles.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the positional relationship among a radiation image source, a slit, and a radiation detector in a radiation image detection and reconstruction apparatus according to the present invention. FIG. 2 is a diagram showing a radiation detector. FIG. 3 is a block diagram showing an embodiment of a radiation detector control and signal processing device. Fig. 4 is an explanatory diagram showing the relationship between the radiation detector and the screen, where Fig. 4A shows the initial positional relationship between the radiation detection element and the screen, and Fig. 4B shows the situation when the detector is rotated by 45°. FIG. 4C shows the relationship with the screen when the detector is rotated 90 degrees. FIG. 5 is an explanatory diagram of storage locations of the first storage device. FIG. 6 is a schematic diagram for explaining the principle of the apparatus according to the present invention. 1... Subject (radiation image source) 2... Slit 4... Radiation detector (401, 402, 403゜40
4~40h~414... Radiation detection element) 5... Rotating dark box assembly 51... Radiation detector support surface 52... Slit plate 53... Cylindrical wall surface 54...
- Gear 55... Drive gear 56... Pulse motor 7... Controller 8... Serial signal parallelization circuit 9... A-D converter 10... First storage device 11... Arithmetic unit 12...
Second storage device 13...D-A converter 14...Monitor -5...Amplifier group Patent applicant Hamamatsu Television Co., Ltd. Agent Patent attorney Hisashi Inoro ♂ In figure 2j

Claims (1)

[Scope of Claims] (1) Formed from a shielding plate having a slit and a large number of rectangular radiation detection elements arranged parallel to the slit and parallel to each other in a plane parallel to the shielding plate having the slit. a rotation device that intermittently rotates the shielding plate and the radiation detector in an equiangular pinch around a common axis perpendicular to each; and each radiation detection element of the radiation detector. a storage device that stores an output signal for each rotational position of the intermittent rotation; and an image given to a pixel associated with the detection element for each detection element at each rotational position obtained from the data stored in the storage device. Assuming that the influence of the detection element and the pixel are determined only by the degree to which the pixel overlaps, a temporary radiation amount of the related pixel is calculated, and a radiation image is reconstructed by further calculations using those temporary radiation amounts. and an output device that outputs the calculation results of the calculation device,
A radiation image detection and reconstruction device configured to reconstruct an image of a radiation image source from a radiation image transmitted through the slit and projected onto a radiation detector. (21) Radiation image detection according to claim 1, wherein the strip-shaped radiation detection element is a radiation detection element in which phosphorus is ion-implanted into P-type silicon to form a PN junction layer parallel to the incident surface. Reconstruction device. (3) The radiation image detection and reconstruction device according to claim 1, wherein the pitch of the pixels is the same as the pitch of the rectangular radiation detection elements.