JP2014025796A - Radiological image photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiological imaging device in which a light source for radiating refresh light does not cause radiation reaching a radiation detection panel to be attenuated.SOLUTION: A radiation image photographing device 1a includes: a radiation detection panel 12 having an optical conversion element 122 formed on a substrate 121 and a fluorescent body 123 for converting radiation to visible light; a light source 18 for emitting refresh light for correcting a feature of the radiation detection panel 12; and a casing 11 which has a radiation incident area 112 to which radiation is made incident and accommodates the radiation detection panel 12 therein; wherein the radiation detection panel 12 is provided so that a spacing 17 is formed between itself and the radiation incident area 112; on a side of the radiation incident area 112 facing a substrate 121, a reflection surface 5 for reflecting the refresh light is provided.

Description

  The present invention relates to a radiographic imaging apparatus to which a radiation detection panel that converts radiation into an electrical signal corresponding to its intensity is applied.

In recent years, a digital radiation image capturing apparatus that directly digitizes a radiation image using a radiation detection panel (so-called flat panel detector (FPD)) in which a phosphor and a large-area solid-state imaging device are in close contact with each other has been put into practical use. Such digital radiographic image capturing apparatuses have been widely used in place of conventional analog image capturing apparatuses. By using a digital radiographic image capturing apparatus employing FPD, a radiographic image can be instantaneously obtained as digital information. For this reason, there are many advantages such as labor saving of photographing work by an engineer and efficiency of interpretation by a doctor.
Various systems have been proposed as radiation detection panels used in such digital radiographic imaging apparatuses. Patent Document 1 discloses a device in which a photoelectric conversion element and a TFT are formed in a sensor substrate, and a phosphor for converting radiation into visible light is provided thereon. When the radiation transmitted through the subject enters the phosphor, the phosphor emits light, and the photoelectric conversion element converts the light emitted from the phosphor into an electrical signal. Thereby, a radiographic image can be obtained as an electrical signal (electrical information).

  The characteristics of the radiation detection panel may change due to long-term use. Further, the radiation detection panel has a characteristic that the S / N ratio is lowered by a dark current. In order to solve such a problem, for example, a configuration in which light (refresh light) is irradiated on each element of the radiation detection panel has been proposed (see Patent Document 2). Further, a configuration for correcting the afterimage characteristics while improving the image quality correction (improvement) of the solid state detector and the efficiency of visible light has been proposed. Specifically, in Patent Document 2, a light source 18 is disposed on a solid state detector side of a radiation detection apparatus in which a solid state detector and a scintillator are stacked, and a light irradiation unit uses light (refresh) for correcting characteristics. The structure which irradiates a radiation detection apparatus from the solid detector side is disclosed.

However, the configuration described in Patent Document 2 has the following problems.
In the configuration described in Patent Document 2, the light irradiation means is arranged on the substrate side of the solid state detector (that is, the side on which the radiation is incident). The light irradiation means includes a light irradiation mechanism that is a light source, and a diffuse reflector that irradiates light from the light irradiation mechanism toward the solid detector. The diffuse reflector is disposed so as to cover the radiation incident surface of the solid state detector. With such a configuration, at the time of capturing a radiographic image, the radiation transmitted through the subject (radiation including information on the subject) enters the solid state detector after passing through the diffuse reflector.
Patent Document 2 proposes glass or polymer resin as the material of the diffuse reflector. A part of the radiation is absorbed when passing through a diffuse reflector made of glass or polymer resin. For this reason, the radiation dose reaching the solid state detector is reduced. In the diffuse reflector, the light guide occupies most of the thickness. The light guide usually has a thickness of about 2 mm. For this reason, for example, radiation having a tube voltage of 100 kVp is absorbed by about 3.8% when passing through a light guide having a thickness of about 2 mm.
Thus, in the conventional configuration, the amount of radiation that reaches the solid state detector is reduced by the absorption of the radiation by the light guide. In order to compensate for the radiation dose, it has been necessary to increase the radiation dose irradiated to the subject. Furthermore, since the scattered radiation from the light guide is included in the radiation image, there is a problem that the image quality of the radiation image is degraded.

Japanese Patent No. 4497663 JP 2010-78385 A

  The present invention has been made in view of the above problems, and an object of the present invention is to prevent or suppress a decrease in radiation reaching the radiation detection panel in the radiographic imaging apparatus having the radiation detection panel.

  In order to achieve the above object, a radiation imaging apparatus according to the present invention includes a radiation detection panel having a substrate, a photoelectric conversion element formed on the surface of the substrate, and a phosphor that converts radiation into visible light, A light source that emits refresh light that corrects the characteristics of the radiation detection panel; a radiation incident region in which radiation is incident from the outside; and a housing 11 that houses the radiation detection panel. A space is formed between the substrate and the radiation incident area, and the light source is disposed so that the refresh light is incident on the space, and the side of the radiation incident area facing the substrate Is provided with a reflecting surface for reflecting the refreshing light.

  ADVANTAGE OF THE INVENTION According to this invention, in the radiographic imaging apparatus which has a radiation detection panel, the fall of the radiation which reaches | attains a radiation detection panel can be prevented or suppressed.

FIG. 1 is a cross-sectional view showing an example of the configuration of the radiographic image capturing apparatus according to the first embodiment of the present invention. FIG. 2 is a plan view showing an example of the configuration of the radiographic image capturing apparatus according to the first embodiment of the present invention, as viewed from the side on which the radiation is incident. FIG. 3 is a cross-sectional view schematically showing a state of progress of refresh light emitted from the light source. FIG. 4 is a diagram for explaining a second embodiment of the present invention, and is a cross-sectional view schematically showing a configuration of a radiographic imaging device according to the second embodiment of the present invention. FIG. 5 is a diagram for explaining a third embodiment of the present invention, and is a cross-sectional view schematically showing a configuration of a radiographic imaging apparatus according to the third embodiment of the present invention.

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

(First embodiment)
1 and 2 are diagrams illustrating a first embodiment of the present invention. FIG. 1 is a cross-sectional view showing an example of the configuration of the radiographic image capturing apparatus 1a according to the first embodiment of the present invention. FIG. 2 is a plan view showing an example of the configuration of the radiographic image capturing apparatus 1a according to the first embodiment of the present invention, as viewed from the side on which the radiation is incident.
The radiographic image capturing apparatus 1 a according to the first embodiment of the present invention includes a housing 11, a radiation detection panel 12, a chassis 13, an electric board 14, and a light source 18. The radiation detection panel 12, the chassis 13, the electric board 14, and the light source 18 are accommodated in the housing 11.

An area (space) that can accommodate the radiation detection panel 12, the chassis 13, and the like is formed in the housing 11. On one side of the housing 11, a radiation incident region 112 (opening) in which external radiation (radiation that has passed through the subject) enters is formed. An arrow X in FIG. 1 schematically shows radiation incident on the radiographic imaging apparatus 1a.
A housing lid 111 is provided in the radiation incident region 112. In other words, the radiation incident area 112 is blocked by the casing lid 111. The casing lid 111 is made of a material having high radiation transparency. For example, the casing lid 111 is formed by CFPR or the like. An electromagnetic shielding member 16 having electromagnetic shielding characteristics (characteristics for blocking electromagnetic waves) is provided on the inner peripheral surface side of the casing lid 111. The electromagnetic shield member 16 is provided so as to be in close contact with the inner peripheral surface of the housing lid 111.
Since the radiographic image capturing apparatus 1a handles weak electric signals, it needs to have resistance to electromagnetic waves from other apparatuses (has EMS). Furthermore, the radiographic image capturing apparatus 1a needs to not disturb the operation of other medical devices (do not generate EMI). Thus, the radiographic image capturing apparatus 1a needs to have EMC (Electro-Magnetic Compatibility). It is effective to shield the portion other than the radiation incident region 112 of the housing 11 with a metal or the like that blocks radiation. However, since the radiation incident area 112 needs to transmit radiation, it cannot be formed of a metal that blocks radiation. Therefore, the radiation incident region 112 is blocked by the sheet-like electromagnetic shielding member 16 that transmits radiation and has electromagnetic shielding characteristics due to EMC. For example, an aluminum foil having a thickness of about 20 μm or an aluminum foil reinforced by a resin sheet having a thickness of about 20 μm is applied to the sheet-like electromagnetic shield member 16. If the aluminum foil has a thickness of about 20 μm, for example, the absorption of radiation having a tube voltage of 100 kVp can be suppressed to about 0.2%.

  The surface of the sheet-like electromagnetic shield member 16 that faces the radiation detection panel 12 becomes the reflection surface 5 that reflects the refresh light. For example, the reflecting surface 5 has a metallic luster of an aluminum foil. For this reason, the refresh light undergoes regular reflection and diffuse reflection on the reflection surface 5 of the electromagnetic shield member 16.

The radiation detection panel 12 includes a substrate 121, a photoelectric conversion element 122, and a phosphor 123.
The substrate 121 of the radiation detection panel 12 is formed of a material that satisfies the conditions of having no chemical action with a semiconductor element, being able to withstand the temperature of a semiconductor process, and having dimensional stability. For example, the substrate 121 is a glass plate. The photoelectric conversion elements 122 are formed to be two-dimensionally arranged on one surface of the substrate 121 by a semiconductor process. The phosphor 123 is provided so as to cover the photoelectric conversion element 122. Thus, the radiation detection panel 12 has a structure in which the substrate 121, the photoelectric conversion element 122, and the phosphor 123 are stacked. According to the radiation detection panel 12 having such a configuration, when the radiation is incident, the phosphor 123 emits light (converts the radiation into visible light), and the light emitted from the phosphor 123 (visible light) is converted into an electrical signal by the photoelectric conversion element 122. Convert to Thus, the radiation detection panel 12 can acquire a radiation image as an electrical signal.
Thus, the radiation detection panel 12 converts the radiation incident from the substrate 121 side into an electrical signal. With such a configuration, the light detection efficiency of the photoelectric conversion element 122 can be increased. Furthermore, the sharpness of the obtained radiographic image can be increased.
The radiation detection panel 12 is connected to the electric board 14 by a flexible wiring board 15 (FPC). A circuit for driving and controlling the radiation detection panel 12 and the light source 18 is constructed on the electric board 14.
As shown in FIG. 1, the radiation detection panel 12 is fixed to the chassis 13 with the substrate 121 facing the radiation incident area 112 side of the housing 11 and the phosphor 123 facing the opposite side of the radiation incident area 112. The The radiation detection panel 12 and the radiation incident area 112 of the housing 11 are separated by a distance L. For this reason, the space | gap 17 is formed between the board | substrate 121 of the radiation detection panel 12, and the surface (reflection surface 5) of the electromagnetic shielding member 16 provided in the internal peripheral surface of the radiation incident area | region 112. FIG.

  The chassis 13 is a member that supports the radiation detection panel 12. The chassis 13 includes a main body 131 that supports the radiation detection panel 12 and a plurality of legs 132 that protrude from the main body 131. The plurality of leg portions 132 are joined to the inner peripheral surface of the housing 11. The main body 131 of the chassis 13 is separated from the inner peripheral surface of the housing 11 (specifically, the surface opposite to the radiation incident region 112) by a plurality of legs 132. A space is formed between the main body 131 of the chassis 13 and the inner peripheral surface of the housing 11. The electric board 14 is disposed in this space.

The light source 18 emits light (refresh light) for correcting the characteristics of the radiation detection panel 12. That is, the radiation detection panel 12 may have a characteristic variation due to long-term use or a decrease in S / N ratio due to a dark current. Therefore, the characteristics of the radiation detection panel 12 can be corrected by the light source 18 irradiating the radiation detection panel 12 with refreshing light.
As described above, the substrate 121 of the radiation detection panel 12 and the inner peripheral surface of the casing lid 111 (the reflection surface 5 of the electromagnetic shield member 16) are separated from each other by a distance L. As a result, a gap 17 is formed between the radiation detection panel 12 and the housing lid 111. A member that attenuates radiation is not provided in the radiation passage region 171 of the gap 17. Note that the radiation passing region 171 of the gap 17 is a region through which the radiation incident from the radiation incident region 112 passes before reaching the radiation detection panel 12. Specifically, the radiation passing region 171 refers to a region inside the radiation incident region 112 when viewed in the normal direction of the radiation incident region 112 (viewed with the radiation incident direction). With such a configuration, the radiation that has entered the housing 11 through the radiation incident region 112 (the housing lid 111 and the electromagnetic shield member 16) of the housing 11 reaches the radiation detection panel 12 as it is.
The light source 18 is provided inside the housing 11 and outside the radiation passage region 171. Then, the light source 18 can cause refresh light to enter the gap 17 between the substrate 121 and the housing lid 111. As shown in FIGS. 1 and 2, the light source 18 has a long rod-like configuration as a whole. Two light sources 18 are provided along two opposing sides of the radiation detection panel 12.
The light source 18 includes a light emitting element 181 that emits refresh light, and an optical member 182 (lens) that irradiates (condenses) the refresh light emitted from the light emitting element 181 toward the gap 17. For the light emitting element 181, an LED whose output has been increased, reduced in size, and reduced in price in recent years is suitable. In the light source 18, a plurality of LEDs are arranged at predetermined intervals according to the size of the radiation detection panel 12. As shown in FIG. 1, the optical member 182 has a configuration in which two convex portions bulging toward the gap 17 are arranged in parallel. In addition, a concave portion (constricted portion) is formed between these two convex portions. The optical member 182 irradiates the refreshing light emitted from the light emitting element 181 toward the inside of the gap 17 at a predetermined angle a (see FIG. 3).
The light source 18 is controlled and driven by a circuit constructed on the electric board 14.

  As shown in FIGS. 1 and 2, a reflector 19 is provided outside the light source 18 (on the side opposite to the radiation incident region 112 in the radiation incident direction view). The reflecting plate 19 improves the irradiation efficiency of the light source 18 by reflecting the light emitted from the light source 18 toward the region between the substrate 121 and the reflecting surface 5. The reflection plate 19 is provided over the entire outer periphery (all four sides) of the radiation detection panel 12. One side of the reflection plate 19 is joined to the outer periphery of the radiation detection panel 12, and the other side is joined to the inner periphery of the housing 11. A seal member 191 is provided between the other side of the reflection plate 19 and the inner peripheral surface of the housing 11. The seal member 191 is made of an elastic material such as rubber. The radiation passing region 171 is sealed from other regions by the reflecting plate 19 and the seal member 191. Thus, the seal member 191 prevents light leakage from between the reflecting plate 19 and the inner peripheral surface of the housing 11, and prevents foreign matters such as dust from entering the radiation passing region 171. In addition, the reflecting plate 19 should just be a material with the high reflectance of light, and a specific structure is not limited.

Next, the refresh light emitted from the light source 18 will be described with reference to FIG. FIG. 3 is a cross-sectional view schematically showing the state of progress of the refresh light emitted from the light source 18. The arrows in FIG. 3 schematically show the refresh light. The refresh light emitted from the light source 18 enters the radiation passage region 171 of the gap 17 and passes between the substrate 121 and the electromagnetic shield member 16. The optical axis of the refresh light is inclined at a predetermined angle a with respect to the surface of the substrate 121 by the optical member 182. For this reason, the refreshing light emitted from the light source 18 reaches the surface of the substrate 121 at a predetermined angle a. For example, when the refractive index of the substrate 121 is 1.52 and the predetermined angle “a” is 5 °, about 20% of the total amount of refresh light reaching the surface of the substrate 121 is in the substrate 121. Incident and the rest is reflected. On the other hand, if the reflecting surface 5 of the electromagnetic shield member 16 has a metallic luster of aluminum foil, about 90% of the total amount of refresh light reaching the surface of the electromagnetic shield member 16 is specularly reflected and the rest is diffusely reflected. To do.
As described above, the refresh light incident on the gap 17 repeats reflection and refraction on the surface of the substrate 121 and regular reflection and diffuse reflection on the reflection surface 5 of the electromagnetic shield member 16. Then, the refresh light reaches one side of the opposite side from one side of the radiation passage region 171. The refreshing light that has reached one side on the opposite side is reflected by the reflecting plate 19 and enters the gap 17 again.

As described above, the two light sources 18 are provided on each of the two opposite sides of the radiation detection panel 12. For this reason, the intensity of the refreshing light reaching the substrate 121 of the radiation detection panel 12 tends to be weaker at the center than at both ends. The intensity distribution of the refresh light can be appropriately set by changing the light distribution characteristic of the LED, the shape of the optical member 182 and the optical characteristic.
For example, the following configuration can be applied as a configuration for uniformizing the intensity distribution of the refreshing light applied to the substrate 121. That is, the ratio of the diffuse reflection of the refresh light is increased in the central portion of the substrate 121, and the ratio of the diffuse reflection of the refresh light is decreased as approaching both sides where the light source 18 is provided. Specifically, for example, a configuration in which diffuse reflection portions 51 having surface properties that diffusely reflect light are provided discretely at the central portion of the reflection surface 5 of the electromagnetic shield member 16 can be applied. The refresh light is diffusely reflected by the diffuse reflector 51 instead of regular reflection. The diffusely reflected refresh light is incident on the substrate 121 at various incident angles. The refreshed light that has been diffusely reflected has a small incident angle with respect to the surface of the substrate 121, and therefore the amount of light that enters the substrate 121 as refracted light increases.
The diffuse reflection part 51 can be formed by roughening the surface roughness compared to other parts. Moreover, the diffuse reflection part 51 can be formed on the reflective surface 5 by printing a predetermined pattern. According to such a configuration, the reflection surface 5 can have arbitrary reflection characteristics, and the surface direction intensity distribution of the refresh light incident on the substrate 121 can be made uniform.

  In the above-described embodiment, the radiation image capturing apparatus 1a has the electromagnetic shield member 16, and the reflective surface 5 is formed on the electromagnetic shield member 16. However, the present invention is limited to such a configuration. Not. For example, when the electromagnetic shielding member 16 is unnecessary from the viewpoint of EMC, a configuration in which the inner peripheral surface of the casing lid 111 is used as the reflecting surface 5 can be applied. When the reflectance of the inner peripheral surface of the casing lid 111 is low, a configuration in which a highly reflective film is attached to the inner peripheral surface of the casing lid 111 can be applied. In the same manner as described above, by forming the diffuse reflection portion 51 at the center of the inner peripheral surface of the housing lid 111, the intensity distribution of the refresh light can be made uniform.

  According to the above configuration, refresh light for correcting characteristics can be irradiated from the substrate 121 side. The light source 18 (optical member 182) is disposed outside the radiation passage region 171 when viewed in the radiation incident direction. For this reason, the radiation which passes through the radiation passage region 171 is not absorbed by the optical member 182 or the like, and the optical member 182 does not emit scattered radiation. Therefore, since it is not necessary to compensate for the radiation dose, there is no need to increase the radiation dose of the subject (subject). In addition, since the optical member 182 does not emit scattered radiation, it is possible to prevent deterioration of the image quality of the radiation image. Thus, the light source 18 (optical member 182) can be prevented from affecting the radiation image.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, about the structure which is common in 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. FIG. 4 is a diagram for explaining a second embodiment of the present invention, and is a cross-sectional view schematically showing a configuration of a radiographic image capturing apparatus 1b according to the second embodiment of the present invention.
The radiographic image capturing apparatus 1b according to the second embodiment is provided with a scattered radiation reducing grid 20 (hereinafter referred to as the grid 20) inside the housing 11. The grid 20 reduces scattered radiation generated inside the subject (in the subject's body) and corrects the contrast of the radiation image.
The grid 20 has a configuration in which a member in which a layer 201 of a substance that easily transmits radiation and a layer 202 of a substance that absorbs radiation are alternately arranged is sandwiched between two flat plates 203. An aluminum plate is applied to the two flat plates 203. Aluminum, glass, or the like is applied to a substance that easily transmits radiation. Lead is applied to substances that absorb radiation.
The grid 20 is provided between the radiation detection panel 12 and the radiation incident area 112 of the housing 11. The surface of the substrate 121 of the radiation detection panel 12 and one surface of the two flat plates 203 of the grid 20 are separated by a distance L as shown in FIG. 4, and a gap 17 is formed between them. The The light source 18 is provided outside the radiation incident area 112 in the radiation incident direction view. The light source 18 emits refreshing light toward the inside of the gap 17. A reflection plate 19 is provided outside the light source 18. The reflecting plate 19 improves the irradiation efficiency of the light source 18 by reflecting the light emitted from the light source 18 toward the region between the substrate 121 and the reflecting surface 5. One side of the reflection plate 19 is bonded to the outer periphery of the radiation detection panel 12, and the other side is bonded to the outer periphery of the grid 20. Thus, the area where the gap 17 and the light source 18 are provided is sealed from the other areas by the reflector 19.
One surface of the two flat plates 203 of the grid 20 (the surface facing the substrate 121 of the radiation detection panel 12) is the reflection surface 5 that reflects the refresh light. If the two flat plates 203 of the grid 20 are made of aluminum, the surface can be made into a reflective surface 5 by mirror finishing the surface. In addition, the diffuse reflection part 51 provided in the reflective surface 5 can apply a structure common to 1st Embodiment. The manner in which the refreshing light emitted from the light source 18 progresses and enters the substrate 121 is the same as that in the first embodiment.
According to the second embodiment of the present invention, in the configuration in which the grid 20 for correcting the contrast of the radiographic image is provided, the same effects as those of the first embodiment of the present invention can be achieved.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a diagram for explaining a third embodiment of the present invention, and is a cross-sectional view schematically showing a configuration of a radiographic image capturing apparatus 1c according to the third embodiment of the present invention. In addition, about the structure which is common in 1st Embodiment and 2nd Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.
In the radiographic image capturing apparatus 1c according to the third embodiment, a detection unit 21 of an automatic exposure mechanism is provided inside the housing 11. The automatic exposure mechanism is a mechanism that controls the exposure amount of radiation in order to stabilize the image quality of the radiation image and reduce the exposure of the subject (subject). The detection unit 21 of the automatic exposure mechanism detects the amount of radiation (exposure amount) that has passed through the subject. The detection unit 21 of the automatic exposure mechanism is provided inside the housing 11 and between the substrate 121 of the radiation detection panel 12 and the grid 20. The detection unit 21 of the automatic exposure mechanism is preferably provided at a position where the radiation immediately before entering the radiation detection panel 12 can be detected. With such a configuration, the detection unit 21 of the automatic exposure mechanism can accurately detect the exposure amount of radiation. For this reason, in the radiographic imaging device 1c according to the third embodiment, the grid 20, the detection unit 21 of the automatic exposure mechanism, from the side of the casing lid 111 (the radiation incident area 112 of the casing 11), inside the casing 11; The radiation detection panels 12 are arranged in this order.
The substrate 121 of the radiation detection panel 12 and the detection unit 21 of the automatic exposure mechanism are separated by a distance L, and a gap 17 is formed between them. The light source 18 is provided so as to be able to emit refreshing light toward the inside of the gap 17. Further, a reflection plate 19 is provided outside the light source 18. One side of the reflection plate 19 is joined to the outer periphery of the radiation detection panel 12, and the other side is joined to the outer periphery of the detection unit 21 of the automatic exposure mechanism. Thus, the area where the gap 17 and the light source 18 are provided is sealed from the other areas by the reflector 19.
The reflection surface 5 is provided on one surface of the detection unit 21 of the automatic exposure mechanism (the surface facing the substrate 121 of the radiation detection panel 12). For example, one surface of the detection unit 21 of the automatic exposure mechanism is formed of an aluminum foil, or an aluminum foil is attached. And the surface of this aluminum foil becomes the reflective surface 5 by mirror-finishing. In addition, the diffuse reflection part 51 provided in the reflective surface 5 can apply the structure similar to 1st Embodiment.
According to the third embodiment of the present invention, the same effects as those of the first embodiment of the present invention can be achieved in the configuration in which the grid 20 and the detection unit 21 of the automatic exposure mechanism are provided. In the third embodiment, the configuration in which the radiographic image capturing apparatus 1c includes the grid 20 is shown, but the configuration without the grid 20 may be used.

  As mentioned above, although embodiment of this invention was described in detail, the said embodiment only showed the specific example in implementing this invention. The technical scope of the present invention is not limited to the above embodiment. The present invention can be variously modified without departing from the gist thereof, and these are also included in the technical scope of the present invention.

Claims (6)

A radiation detection panel having a substrate, a photoelectric conversion element formed on the surface of the substrate, and a phosphor that converts radiation into visible light;
A light source that emits refresh light to correct the characteristics of the radiation detection panel;
A radiation incident region where radiation is incident from the outside is provided, and a housing in which the radiation detection panel is accommodated,
Have
The radiation detection panel is provided such that a gap is formed between the substrate and the radiation incident region,
The light source is provided so that the refresh light enters the gap,
A radiation image capturing apparatus, wherein a reflection surface that reflects the refreshing light is provided on a side of the radiation incident region facing the substrate. A shield member having electromagnetic shielding characteristics is provided on the side of the housing facing the substrate in the radiation incident area,
The radiographic imaging apparatus according to claim 1, wherein a surface of the shield member facing the substrate is the reflective surface. A radiation detection panel having a substrate, a photoelectric conversion element formed on a surface of the substrate, and a phosphor provided to cover the photoelectric conversion element;
A grid for reducing scattered radiation that reduces scattered radiation emitted by the subject;
A light source that emits refresh light to correct the characteristics of the radiation detection panel;
A radiation incident region where radiation is incident from the outside is provided, and a housing in which the radiation detection panel is accommodated,
Have
The radiation detection panel is provided so that the substrate faces the radiation incident region side of the casing,
The scattered radiation reduction grid is provided between the radiation detection panel and the radiation incident area of the housing,
A gap is formed between the substrate of the radiation detection panel and the grid for reducing scattered radiation,
The light source is provided so that the refresh light enters the gap,
The radiation image capturing apparatus according to claim 1, wherein a reflection surface that reflects the refreshing light is provided on a side of the grid for reducing scattered radiation facing the substrate. A radiation detection panel having a substrate, a photoelectric conversion element formed on the surface of the substrate, and a phosphor that converts radiation into visible light;
A detection unit for detecting the amount of radiation exposure;
A light source that emits refresh light to correct the characteristics of the radiation detection panel;
A radiation incident region where radiation is incident from the outside is provided, and a housing in which the radiation detection panel is accommodated,
Have
The detection unit is provided between the radiation detection panel and the radiation incident region of the housing,
A gap is formed between the substrate and the detection unit of the radiation detection panel,
The light source is provided so that the refresh light enters the gap,
A radiographic imaging apparatus, wherein a reflection surface that reflects the refresh light is provided on a side of the detection unit that faces the substrate.   5. The radiographic image capturing apparatus according to claim 1, wherein the reflecting surface includes a region that regularly reflects the refresh light and a region that diffusely reflects the refresh light. 6.   The radiographic imaging apparatus according to claim 1, wherein the gap is sealed from another region inside the housing.

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