JP2022142750A - Radiographic device and radiographic system - Google Patents

Abstract

To provide a mechanism that can prevent a deterioration in image quality of a radiation image without losing the portability of a radiographic device.SOLUTION: A radiographic device comprises: a radiation detection panel 110 that detects an incident radiation 211 as an electric signal related to a radiation image; a support base 120 that supports the radiation detection panel 110 from a back face 160b side in a housing 160; internal structures 130 and 140 that are arranged on a side of the back face 160b of the support base 120; and a plurality of fixing members 150-1 to 150-4 that fix the internal structures 130 and 140 to the support base 120. The difference in radiation shield rate between the support base 120 and at least one fixing member 150 of the plurality of fixing members 150-1 to 150-4 is less than 50%. In plan view seen from a radiation incident direction, a sheet-like member having a radiation shield rate of 50% or more is not arranged in an area on the back face 160b side of the radiation detection panel 110 and overlapping the fixing members 150-1 to 150-4.SELECTED DRAWING: Figure 2

Description

The present invention relates to a radiation imaging apparatus and a radiation imaging system.

2. Description of the Related Art In recent years, digital radiography apparatuses that acquire digital images using semiconductor sensors have been widely used for medical image diagnosis and non-destructive inspection.

Furthermore, a portable radiographic imaging device, which is a compact and lightweight digital radiographic imaging device, is used for imaging in general hospital rooms, outdoors, and the like (see Patent Document 1).

2. Description of the Related Art When radiography is performed, there are cases in which the radiation irradiation area is made wider than the outer shape of the imaging apparatus. In this case, the radiation that passes through the imaging device without being irradiated is scattered by structures such as walls and floors located on the back side of the imaging device, enters the inside of the imaging device from the back side, and is applied to the imaging device. It becomes an input. Scattered radiation incident from the back side of such an imaging apparatus is reflected in an image as a difference in radiation shielding rate due to the internal members of the imaging apparatus, and may become artifacts leading to misdiagnosis.

As an example of this countermeasure, for example, Patent Document 2 proposes disposing a radiation shield so as to cover the entire imaging element region in order to shield scattered radiation from entering the imaging element. Moreover, in Patent Document 2, a metal plate material having high radiation shielding properties such as lead (Pb) is used as the radiation shield. In such a metal plate material, it is known that the radiation shielding property generally decreases when the surface specific gravity is reduced. Alternatively, it is necessary to arrange a metal plate material having a large plate thickness. On the one hand, this increases the overall weight of the radiographic imaging apparatus and impairs the portability of portable radiographic imaging apparatus.

As a method for reducing the weight of the apparatus and suppressing artifacts due to scattered radiation, as described in Patent Document 3, a radiation shield can be removed, and as described in Patent Document 4, one of the substrates supporting the image pickup device can be used. There are some that give the part a shielding function.

JP-A-2004-321568 Japanese Patent Application Laid-Open No. 2002-214352 JP-A-2003-57352 JP 2012-211866 A

However, even if the methods described in Patent Document 3 and Patent Document 4 are used, the portability of the radiation imaging apparatus is improved by reducing or reducing the weight of the radiation shield, and the image quality deterioration of the radiographic image due to scattered radiation is suppressed. From this point of view, it was inadequate.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and an object of the present invention is to provide a mechanism capable of suppressing image quality deterioration of a radiographic image without impairing the portability of the radiographic apparatus.

A radiation imaging apparatus of the present invention comprises a radiation detection panel contained in a housing for detecting incident radiation as an electrical signal relating to a radiographic image; a support base that supports the radiation detection panel from the back side opposite to the surface; an internal structure that is contained in the housing and arranged on the back side of the support base; and a plurality of fixing members that are contained in a housing and fix the internal structure to the support base, wherein at least one fixing member among the plurality of fixing members and the support base are shielded from radiation. A sheet-shaped sheet having a radiation shielding rate of less than 50% and a radiation shielding rate of 50% or more in a region overlapping with the fixing member on the back side of the radiation detection panel in a plan view viewed from the radiation incident direction. It is characterized in that no members are arranged.
Further, the present invention includes a radiographic system including the radiographic apparatus described above and a radiation irradiation apparatus that emits the radiation.

According to the present invention, it is possible to suppress image quality deterioration of radiographic images without impairing the portability of the radiographic apparatus.

1 is a diagram showing an example of a schematic configuration of a radiation imaging system according to a first embodiment of the present invention; FIG. 1 is a diagram showing an example of the internal configuration of a radiation imaging apparatus according to a first embodiment of the present invention; FIG. FIG. 7 is a diagram showing an example of the internal configuration of a radiographic imaging apparatus according to a second embodiment of the present invention; FIG. 11 is a diagram showing an example of the internal configuration of a radiographic imaging apparatus according to a third embodiment of the present invention; A radiation imaging apparatus according to a third embodiment of the present invention is shown, and in a plan view seen from the radiation incident direction (radiation incident direction) shown in FIG. 1 is a see-through plan view; FIG.

EMBODIMENT OF THE INVENTION Below, the form (embodiment) for implementing this invention is demonstrated, referring drawings. The dimensions and structures of various structures in each embodiment of the present invention described below are not limited to those shown in the specification and drawings. In addition, although it is preferable to use X-rays as the radiation in the present invention, it is not limited to X-rays. shall be included in radiation in

(First embodiment)
First, a first embodiment of the present invention will be described.

FIG. 1 is a diagram showing an example of a schematic configuration of a radiation imaging system 10 according to the first embodiment of the invention. As shown in FIG. 1, the radiation imaging system 10 includes a radiation imaging apparatus 100 and a radiation irradiation apparatus 200, and can be used particularly for medical purposes.

The radiation irradiation device 200 is a device that irradiates the subject H with radiation 211 . The radiation irradiation apparatus 200 includes a radiation tube 210 which is an X-ray generation unit that generates radiation 211 and a collimator 220 that defines the beam divergence angle of the radiation 211 generated by the radiation tube 210 .

The radiation imaging apparatus 100 is composed of, for example, an FPD. In the example shown in FIG. 1, the housing 160 of the radiation imaging apparatus 100 has a radiation incident surface 160a on which the radiation 211 is incident, a back surface 160b located on the opposite side of the radiation incident surface 160a, and the radiation incident surface 160a and the back surface 160b. , and a side surface 160c connecting the ends. In addition, in the example shown in FIG. 1, the phosphor/imaging device and members disposed on the back surface 160b side of the phosphor/imaging device are illustrated inside the housing 160 .

Next, the scattered radiation referred to in the problem to be solved by the present invention will be described with reference to FIG.

Radiation 211 emitted from the radiation irradiation device 200 enters the housing 160 of the radiation imaging device 100, is absorbed by the phosphor, and is converted into visible light. Then, the visible light generated by the phosphor is received by the two-dimensionally distributed imaging device, and the imaging device generates an electric signal (image signal) related to the radiographic image according to the two-dimensional distribution of the radiation dose (dose distribution). do.

On the other hand, part of the radiation 211 emitted from the radiation irradiation apparatus 200 passes through the radiation imaging apparatus 100 without being absorbed, or passes through the radiation imaging apparatus 100 without being transmitted through the inside of the radiation imaging apparatus 100 . There are also things. These rays 211 may be scattered by structures K such as walls and floors located on the back surface 160b side of the radiographic imaging apparatus 100 and may enter the radiation imaging apparatus 100 from the back surface 160b side. Here, the scattered radiation 212 is assumed to be the radiation 211 incident from the rear surface 160 b side of the radiation imaging apparatus 100 due to scattering. The scattered radiation 212 is shielded by a member or the like arranged on the side of the back surface 160b of the phosphor/imaging element, so that the pixel value of the shielded portion is lowered, and the difference in the shadow is reflected on the radiographic image. It looks like a reflection. Therefore, as the number and ratio of the scattered radiation 212 incident from the back surface 160b side of the radiation imaging apparatus 100 increase, the amount of reflection increases, and the image quality deterioration of the radiographic image increases.

Scattered radiation 212 incident from the back surface 160 b side of the radiation imaging apparatus 100 depends on imaging conditions such as the imaging site of the subject H and the tube voltage in the radiation tube 210 , the aperture size of the collimator 220 , and the radiation from the radiation tube 210 . It depends on the imaging environment such as the SID, which is the distance to the imaging apparatus 100, and the distance from the radiation imaging apparatus 100 to the structure K. FIG. For example, the higher the tube voltage in the radiation tube 210, the more the radiation 211 that passes through the inside of the radiography apparatus 100. As a result, the number of scattered radiation 212 that enters from the rear surface 160b side of the radiography apparatus 100 also increases. increase. Further, for example, in a thick region of the object H, that is, a region where the dose of the radiation 211 is small, the ratio of the scattered radiation 212 incident from the rear surface 160b side of the radiographic imaging apparatus 100 increases, and as a result, reflection becomes more visible. Also, for example, depending on the size of the aperture of the collimator 220 and the SID, the number of radiation 211 passing through the outside of the radiation imaging apparatus 100 increases, and as a result, the scattered radiation 212 incident from the rear surface 160b side of the radiation imaging apparatus 100 is scattered. The number may also increase. Regarding the distance between the radiation imaging apparatus 100 and the structure K, the number of scattered radiations 212 incident from the rear surface 160b side of the radiation imaging apparatus 100 peaks at a certain distance, and the number of scattered radiations 212 decreases as the distance decreases. and the number of scattered radiation 212 decreases with increasing distance.

Next, the radiation shielding rate (X-ray shielding rate when X-rays are applied as radiation) will be described.

The radiation shielding rate (X-ray shielding rate) in this embodiment is considered when the tube voltage of the radiation tube 210 is 120 kV or less. The radiation shielding rate (X-ray shielding rate) of an arbitrary object is measured at an arbitrary position within a range of 0.5 m to 2 m from the radiation tube 210 with radiation 211 (X-rays) irradiated at a certain tube voltage. Let I be the energy of , and let I' be the energy measured at the same position of the radiation 211 (X-rays) irradiated with the same tube voltage and transmitted through the object, the following equation (1) is obtained.
Radiation shielding rate = (1-I'/I) x 100 [%] (1)

Next, the internal configuration of the radiation imaging apparatus 100 according to the first embodiment will be described.
FIG. 2 is a diagram showing an example of the internal configuration of the radiation imaging apparatus 100 according to the first embodiment of the present invention. Specifically, FIG. 2 is a diagram viewed from the same direction as the radiation imaging apparatus 100 shown in FIG. Also, in the following description, the radiation imaging apparatus 100 according to the first embodiment shown in FIG. 2 is referred to as "radiation imaging apparatus 100-1". Further, in FIG. 2, the same reference numerals are assigned to the same components as those shown in FIG.

As shown in FIG. 2, the radiation imaging apparatus 100-1 includes a radiation detection panel 110, a support base 120, internal parts 130, an electric board 140, a fixing member 150, and a housing 160. .

The radiation detection panel 110 is a panel that is contained in a housing 160 and detects incident radiation 211 as an electric signal (image signal) relating to a radiographic image. The radiation detection panel 110 includes the phosphor and imaging device shown in FIG.

The support base 120 is a base that is included in the housing 160 and supports the radiation detection panel 110 from the rear surface 160b located on the opposite side of the radiation entrance surface 160a on which the radiation 211 is incident in the housing 160.

The internal component 130 is a component contained in the housing 160 and arranged on the back surface 160 b side of the support base 120 . For example, this internal part 130 is a part for fixing the radiation detection panel 110 and the support base 120 to the housing 160 (for example, a part for fitting to a member joined to the housing 160). is. Also, the electric board 140 is an electric board enclosed in the housing 160 and arranged on the back surface 160 b side of the support base 120 . For example, the electric board 140 is an electric board for supplying electric power to the radiation detection panel 110 or an electric board for processing an electric signal (image signal) relating to a radiation image obtained by the radiation detection panel 110 . It is desirable that the internal component 130 and the electric board 140 have a radiation shielding rate of less than 50% as defined by the above formula (1). In addition, in the present embodiment, the internal component 130 and the electric board 140 are included in the housing 160 and arranged on the back surface 160b side of the support base 120. .

Fixing members 150 - 1 to 150 - 4 are a plurality of fixing members that are contained in housing 160 and fix internal component 130 and electric substrate 140 , which are the internal structures described above, to support base 120 . Among the plurality of fixing members 150-1 to 150-4, the fixing members 150-1 and 150-2 are members for fixing the correspondingly arranged internal parts 130 to the support base 120. It is a member having a screw structure consisting of a female screw 151a and a male screw 152a. Moreover, among the plurality of fixing members 150-1 to 150-4, the fixing members 150-3 and 150-4 are members for fixing the electric board 140 to the support base 120, and are connected to the female screw 151b and the male screw 152b, respectively. It is a member having a screw structure. Further, in the example shown in FIG. 2, these plurality of fixing members 150-1 to 150-4 are members arranged inside the support base 120. As shown in FIG.

The housing 160 is a housing of the radiation imaging apparatus 100-1 that includes the radiation detection panel 110, the support base 120, the internal parts 130, the electric board 140, and the fixing member 150. FIG. In the example shown in FIG. 2, the housing 160 is composed of a front cover portion 161 having a radiation incident surface 160a and a rear cover portion 162 having a rear surface 160b and side surfaces 160c. In this embodiment, the housing 160 is not limited to the one composed of the front cover portion 161 and the rear cover portion 162 shown in FIG. For example, the rear cover portion 162 may be divided into a back cover component having a back surface 160b and a frame component having a side surface 160c. Further, the front cover portion 161 having the radiation incident surface 160 a is made of a material having a radiation absorption rate lower than that of the rear cover portion 162 in order to allow the radiation 211 to enter the radiation detection panel 110 . Furthermore, it is preferable that the front cover portion 161 having the radiation incident surface 160a is made of a material that is light in weight and capable of securing a certain strength against impacts and the like. For example, resin material, CFRP (carbon fiber reinforced plastic), or the like is used as a constituent material of the front cover portion 161 having the radiation incident surface 160a. In addition, the rear cover part 162 is made of a low specific gravity material such as magnesium, aluminum, CFRP, etc., in order to ensure strength against dropping and impact, and to reduce weight for the purpose of reducing the burden during transportation. is preferred.

In the radiation imaging apparatus 100-1 according to the present embodiment, as shown in FIG. 2, on the side of the back surface 160b of the radiation detection panel 110 (rear side), when viewed from the radiation incident direction, the above (1) A sheet-shaped member having a radiation shielding rate of 50% or more defined by the formula is not arranged. Further, in a plan view viewed from the direction of incidence of radiation, the above-described sheet-like member is not arranged at least in regions overlapping with the fixing members 150-1 to 150-4.

Next, the support base 120 and the fixing member 150 shown in FIG. 2 will be described in detail.
The support base 120 and the fixing member 150 are preferably made of a material with relatively high specific rigidity, such as an alloy containing at least one of Al and Mg, or a composite material containing carbon fiber. . In the present invention, the fixing member 150 is a member having a structure of female threads 151a and 151b, a structure of male threads 152a and 152b, or a structure of both. In the example shown in FIG. 2, the female screw 151 of the fixing member 150 is integrated with the support base 120, but the present embodiment is not limited to this. It may be separate. At this time, in the radiation imaging apparatus 100-1 according to the present embodiment, the difference in radiation shielding rate between the support base 120 and at least one fixing member 150 out of the plurality of fixing members 150-1 to 150-4 is , less than 50%.

Further, for example, when the support base 120 is made of Al or Mg alloy with a thickness of 1 mm to 3 mm, all the fixing members 150-1 to 150-4 are made of Al or Mg with a thickness of 6 mm or less in the incident direction of the radiation 211. It is preferably made of an alloy. In this case, all female threads 151 are preferably made of an Al or Mg alloy having a thickness of 6 mm or less in the incident direction of radiation 211 . When support base 120 and fixing members 150-1 to 150-4 are made of the same material, the thickness of fixing members 150-1 to 150-4 is in the range of 1 to 6 times the thickness of support base 120. Preferably. Secondly, it is preferable that the female screw 151 arranged near the center of the imaging image area of the radiation imaging apparatus 100-1 is made of Al or an alloy containing Mg with a thickness of 6 mm or less. This is because the thickness of the subject H tends to be thick near the center of the radiation imaging apparatus 100-1, and the radiation 211 that passes through the subject H and reaches the radiation detection panel 110 is This is because the influence of the scattered radiation 212 on the radiographic image increases when the dose becomes smaller than the dose of the scattered radiation 212 . Further, for example, when the support base 120 is made of a resin material such as CFRP or GFRP, all the fixing members 150-1 to 150-4 are preferably made of a resin material.

As described above, in the radiographic apparatus 100-1 according to the first embodiment, at least one fixing member 150 out of the plurality of fixing members 150-1 to 150-4 and the support base 120 are shielded from radiation. The difference in ratio is less than 50%, and no sheet-like member having a radiation shielding ratio of 50% or more is arranged on the back surface 160a side of the radiation detection panel 110 .
According to such a configuration, a sheet-like member having a radiation shielding rate of 50% or more (having a high specific gravity or a large plate thickness) is not arranged, so that an increase in weight can be suppressed. Since the difference in radiation shielding rate between at least one fixing member 150 and the support base 120 is less than 50%, it is possible to suppress image quality deterioration of radiographic images due to scattered radiation. As a result, it is possible to provide highly reliable radiation images.

(Second embodiment)
Next, a second embodiment of the invention will be described. In the following description of the second embodiment, the description of matters common to the first embodiment is omitted, and the matters different from the first embodiment are described.

A schematic configuration of a radiography system according to the second embodiment is similar to the schematic configuration of the radiography system 10 according to the first embodiment shown in FIG.

Next, the internal configuration of the radiation imaging apparatus 100 according to the second embodiment will be described.
FIG. 3 is a diagram showing an example of the internal configuration of a radiation imaging apparatus 100 according to the second embodiment of the invention. Specifically, FIG. 3 is a diagram seen from the same direction as the radiation imaging apparatus 100 shown in FIG. Also, in the following description, the radiation imaging apparatus 100 according to the second embodiment shown in FIG. 3 will be referred to as "radiation imaging apparatus 100-2". Moreover, in FIG. 3, the same symbols are attached to the same components as those shown in FIGS. Furthermore, in FIG. 3, one fixing member 150 out of the plurality of fixing members 150-1 to 150-4 shown in FIG. 2 is illustrated as a representative.

In the second embodiment, unlike the first embodiment described above, the radiation absorption rate of the radiation detection panel 110 is also considered. In the radiation imaging apparatus 100-2 according to the second embodiment, the radiation absorption rate in the radiation detection panel 110 of the radiation 211 directly incident on the radiation detection panel 110 is reduced by the plurality of fixing members (150-1 150-4), the difference in radiation shielding rate between at least one fixing member 150 and the support base 120 is less than 5%. This relationship will be described in detail below with reference to FIG.

As shown in FIG. 3, x is the radiation absorption rate (X-ray absorption rate) of the radiation detection panel 110, A is the radiation shielding rate (X-ray shielding rate) of the support base 120, and A is the radiation shielding rate of the fixing member 150. Let B be the (X-ray shielding rate). Also, the energy of the scattered radiation (scattered X-rays) 212 has an attenuation coefficient of It shall be expressed as It using t.

Based on the above viewpoint, the energy of the radiation shown in FIG. 3 is expressed as follows.
- Energy of the radiation 211 absorbed by the radiation detection panel 110: Ix
The energy of the scattered radiation 212 transmitted through the support base 120 and reaching the radiation detection panel 110: It (1-A)
The energy of the scattered radiation 212 transmitted through the fixing member 150 and reaching the radiation detection panel 110: It (1-B)
As described above, in the present embodiment, the radiation (X-rays) 211 directly incident on the radiation detection panel 110 is scattered radiation (scattered X-rays) 212 with respect to the radiation absorption rate (X-ray absorption rate) x in the radiation detection panel 110 . The difference in the radiation shielding rate (X-ray shielding rate) between the fixing member 150 and the support base 120 has the relationship shown in the following equation (2).

Also, in the present embodiment, the attenuation coefficient t is taken into consideration under the condition that the amount of scattered radiation 212 incident on the radiographic apparatus 100-2 is relatively large. Specifically, for example, the tube voltage in the radiation tube 210 is 120 kV or less, the distance from the radiation tube 210 to the radiography apparatus 100-2 is 2 m or less, and the distance from the radiography apparatus 100-2 to the structure K is 50 cm. The following conditions are considered.

In addition, the phosphor included in the radiation detection panel 110 in the present embodiment includes, for example, a metal oxide such as CsI and Gd ₂ O ₂ S as a component, and has the property of converting radiation into visible light. , and its film thickness is in the range of 200 μm to 600 μm.

Similarly to the radiographic apparatus 100-1 according to the first embodiment, the radiographic apparatus 100-2 according to the second embodiment can also obtain a radiographic image using scattered radiation without impairing the portability of the radiographic apparatus. Image quality deterioration can be suppressed. As a result, it is possible to provide highly reliable radiation images.

(Third embodiment)
Next, a third embodiment of the invention will be described. In addition, in the description of the third embodiment described below, the description of matters common to the first and second embodiments described above is omitted, and the matters different from those of the first and second embodiments described above are omitted. Give an explanation.

A schematic configuration of a radiation imaging system according to the third embodiment is similar to the schematic configuration of the radiation imaging system 10 according to the first embodiment shown in FIG.

Next, the internal configuration of the radiation imaging apparatus 100 according to the third embodiment will be described.
FIG. 4 is a diagram showing an example of the internal configuration of a radiation imaging apparatus 100 according to the third embodiment of the invention. Specifically, FIG. 4 is a diagram seen from the same direction as the radiation imaging apparatus 100 shown in FIG. FIG. 5 shows a radiation imaging apparatus 100 according to a third embodiment of the present invention, and in a plan view seen from the incident direction of the radiation 211 (radiation incident direction) shown in FIG. 2 is a see-through plan view from the side opposite to the incident side). FIG. Also, in the following description, the radiation imaging apparatus 100 according to the third embodiment shown in FIGS. 4 and 5 will be referred to as "radiation imaging apparatus 100-3". Further, in FIGS. 4 and 5, the same reference numerals are given to the same components as those shown in FIGS. 1 to 3. FIG.

A radiation imaging apparatus 100-3 according to the third embodiment shown in FIG. A sheet-like radiation shielding member (hereinafter simply referred to as “sheet-like member”) 170 is additionally arranged. The sheet-like member 170 is preferably a weak shielding member that shields the radiation 211 transmitted through the radiation detection panel 110 by less than 50%, but the radiation shielding rate may be 50% or more. Moreover, the sheet-shaped member 170 is made of a material containing a metal other than lead.

Further, the housing 160 of the radiation imaging apparatus 100-3 includes a battery 190 for supplying electric power to each unit such as the radiation detection panel 110 and the electric board 140, a current supplied from the outside is rectified, and a predetermined voltage is obtained. A charging circuit board 180 for charging the battery 190 and wiring 300 connecting the charging circuit board 180 and the electric board 140 are included. Internal component 130 includes a clamp that secures wire 300 to support base 120 in place. Further, in the radiation imaging apparatus 100-3, the fixing member 150-1 is a member for fixing the charging circuit board 180 to the support base 120. As shown in FIG. Although the battery 190 is completely enclosed in the housing 160 in FIG. 4, the battery 190 is not limited to this in the present embodiment. may be The sheet-like member 170 is attached to both the battery 190 and the electric substrate 140 (fixing the electric substrate 140 to the support base 120) in plan view from the incident direction of the radiation 211 (radiation incident direction) shown in FIG. The respective overlapping regions (including members 150-3 and 150-4) are arranged in a generally rectangular shape to completely cover the plane of projection onto the rear surface 160b. Note that the sheet member 170 may be arranged on either the projection plane of the battery 190 or the projection plane of the electric substrate 140 . Moreover, the sheet-like member 170 does not need to have a substantially rectangular shape as shown in FIG. However, the sheet-like member 170 is not arranged on the projection plane onto the rear surface 160b of the fixed members 150-1 and 150-2. In the present embodiment, the female threads 151a and 151b are female threads integrated with the support base 120 made of a structural material with relatively high specific rigidity, such as an alloy containing Al or Mg or a composite material containing carbon fiber. 152a and 152b are male screws made of ferrous material. At this time, the male screws 152a and 152b preferably have a radiation shielding rate difference of less than 50% from the support base 120, but may be 50% or more.

In addition, in the example shown in FIG. 4, the sheet-like member 170 is arranged so as to partially cover the projection plane onto the back surface 160b of the radiation detection panel 110, but the present embodiment is limited to this. not something. For example, when the sheet member 170 is a member having a radiation shielding rate of less than 50%, it is arranged so as to cover substantially the entire surface (substantially the entire surface) of the projection plane onto the rear surface 160b of the radiation detection panel 110. may

As shown in FIG. 4, by partially arranging the sheet-like member 170, the scattered radiation 212 reaching the support base 120, the female screw 151b, the male screw 152b, and the battery 190 on the projection plane of the sheet-like member 170 is blocked. can be reduced. As a result, it is possible to further suppress partial reflection in the radiographic image, and further suppress deterioration of the electric substrate 140 and the battery 190 due to the radiation 211 .

In the radiographic imaging apparatus 100-3 according to the third embodiment, similarly to the radiographic imaging apparatus 100-1 according to the first embodiment, radiographic imaging by scattered radiation can be performed without impairing the portability of the radiographic imaging apparatus. Image quality deterioration can be suppressed. As a result, it is possible to provide highly reliable radiation images.

It should be noted that the above-described embodiments of the present invention are merely examples of specific implementations of the present invention, and the technical scope of the present invention should not be construed to be limited by these. is. That is, the present invention can be embodied in various forms without departing from its technical concept or main features.

10: radiography system, 100: radiography apparatus, 110: radiation detection panel, 120: support base, 130: internal parts, 140: electric board, 150: fixing member, 151a, 151b: female screws, 152a, 152b: male screws 160: Housing 160a: Radiation incident surface of housing 160b: Rear surface of housing 160c: Side surface of housing 161: Front cover portion 162: Rear cover portion 170: Sheet-like member 180: Charging circuit Substrate 190: Battery 200: Radiation irradiation device 210: Radiation tube 211: Radiation 212: Scattered radiation 220: Collimator 300: Wiring H: Object

Claims (11)

a radiation detection panel that is contained in a housing and detects incident radiation as an electrical signal related to a radiographic image;
a support base that is contained in the housing and supports the radiation detection panel from the rear surface side located on the opposite side of the radiation entrance surface on which the radiation is incident in the housing;
an internal structure contained in the housing and arranged on the back side of the support base;
a plurality of fixing members that are contained in the housing and fix the internal structure to the support base;
has
a difference in radiation shielding rate between at least one fixing member among the plurality of fixing members and the support base is less than 50%;
A sheet-like member having a radiation shielding rate of 50% or more is not arranged in a region overlapping with the fixing member on the back side of the radiation detection panel in a plan view viewed from the direction of incidence of radiation. radiography equipment. 2. The radiographic apparatus according to claim 1, wherein no sheet-like member having a radiation shielding rate of 50% or more is arranged on the back side of said radiation detection panel. 2. The radiographic apparatus according to claim 1, wherein a sheet-like member having a radiation shielding rate of less than 50% is arranged on the back side of said radiation detection panel. the internal structure includes an electrical substrate for processing the electrical signal;
A sheet-shaped member having a radiation shielding rate of 50% or more is arranged in a region on the back side of the radiation detection panel, which overlaps at least one of the electric substrate and the battery in plan view when viewed from the direction of incidence of radiation. 2. The radiographic apparatus according to claim 1, wherein the radiographic apparatus is The sheet-like member is
A member having a radiation shielding rate of less than 50% for shielding the radiation transmitted through the radiation detection panel,
arranged to partially or substantially cover a plane projected onto the rear surface of the radiation detection panel,
4. The radiographic apparatus according to claim 3, wherein the radiographic apparatus is made of a material containing a metal other than lead. At least one fixing member among the plurality of fixing members and the support for scattered radiation, which is the radiation that is incident by scattering, with respect to the radiation absorptivity in the radiation detection panel of the radiation that is directly incident on the radiation detection panel. 6. The radiographic apparatus according to any one of claims 1 to 5, wherein a difference in radiation shielding rate from the base is less than 5%. The radiographic apparatus according to any one of claims 1 to 6, wherein the fixing member is a member arranged inside the support base. The radiographic apparatus according to any one of claims 1 to 7, wherein the fixing member is a member having a female thread structure, a male thread structure, or both. 9. Any one of claims 1 to 8, wherein the support base and the fixing member are made of an alloy containing at least one of Al and Mg, or a composite material containing carbon fiber. 10. The radiographic imaging apparatus according to the above item. 10. The radiography according to any one of claims 1 to 9, wherein the internal structure includes internal parts for fixing the radiation detection panel and the support base to the housing. Device. a radiation imaging apparatus according to any one of claims 1 to 10;
a radiation irradiation device that irradiates the radiation;
A radiation imaging system comprising:

Images