JP2003057352A - Radiological image radiographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiological image radiographing device having high operability and high reliability causing no deterioration of image quality with excellent shielding of scattered radiation. SOLUTION: This radiological image radiographing device for forming an image corresponding to the radiation intensity of prescribed radiation irradiated to an object is characterized by having a detection part for detecting the radiation intensity of the prescribed radiation and a shielding part installed detachably on a prescribed position on the opposite side to the irradiation direction of the prescribed radiation through the detection part, for shielding the detection part from the radiation except the prescribed radiation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a radiation image capturing apparatus, and more particularly, to a radiation image receiving medium.
The present invention relates to a radiation digital image capturing apparatus which has an area sensor in which a plurality of photoelectric conversion elements are arranged in the same plane and which acquires a radiation digital image.

[0002]

2. Description of the Related Art A method of detecting the intensity distribution of radiation that has been applied to a subject and transmitted through the subject to obtain a radiation image of the subject is widely used in industrial nondestructive inspection and medical diagnosis. . As a method for obtaining a radiation image, there is generally a film / screen method in which a photosensitive film and a phosphor having sensitivity to radiation are combined to perform photographing. In this method, a sheet-shaped phosphor that emits light when irradiated with radiation is adhered to both sides of the photosensitive film, the radiation transmitted through the subject is converted into visible light by the phosphor, and this visible light is exposed to the photosensitive film. To get a latent image. The latent image formed on the film can be visualized by developing it by a chemical treatment to obtain a radiation image.

On the other hand, due to recent advances in digital technology,
A radiation image such as an X-ray image is converted into an electric signal, and the digital image is subjected to image processing to display it (for example, CR.
T, a liquid crystal display or the like) or recorded on a recording medium such as a film by a recording device (printer or the like). As a method of converting such a radiation image into an electric signal, a transmission image of radiation is accumulated as a latent image in a phosphor, and the latent image is photoelectrically read out by irradiating excitation light such as laser light to a visible image. A radiation image recording / reproducing system for outputting is proposed in Japanese Unexamined Patent Publication No. 12429 of 1980 and Japanese Unexamined Patent Publication No. 11395 of 1956. Further, due to recent progress in semiconductor processes, it is possible to manufacture a semiconductor sensor, and a radiation image capturing apparatus for obtaining a radiation digital image using this semiconductor sensor has been developed.

An apparatus for obtaining such a radiation digital image has a wider range of detectable radiation dose (dynamic range) than an apparatus using a photosensitive film, and an image signal converted into an electric signal can be immediately obtained. for that reason,
There is an advantage that an image after image processing can be obtained immediately. Therefore, the control of the incident radiation dose does not necessarily need to be strict as compared with the imaging method using the photoconductor film.

FIG. 9 shows a system configuration diagram of a conventional image pickup system. The radiation emitted from the radiation generation apparatus 1000 is applied to the subject H, and the radiation transmitted through the subject H is detected by the radiation image capturing apparatus 1200 having the radiation detection sensor 1100 built therein. As a result, the obtained radiation image signal is displayed as a radiation image of the subject S on the monitor 1400 after being subjected to digital image processing by the image processing device 1300.

FIG. 10 shows a schematic cross-sectional block diagram of the image pickup section 1210 of the radiation image radiographing apparatus 1200. Imaging unit 1
210 is a phosphor 1211a that converts radiation into visible light.
And a photoelectric conversion element 1211b arranged in a matrix for converting visible light into an electric signal, and a photoelectric conversion element 121.
A sensor 1211 including a substrate 1211c on which 1b is formed, and a base 1212 supporting the sensor 1211.
And a circuit board 1213 and wiring 1214 on which electronic components for processing photoelectrically converted electric signals are mounted, and a housing 1215 for housing these.

In the radiation image capturing apparatus 1200, the radiation that has passed through the subject H is not completely absorbed by the phosphor 1211a, but part of the radiation passes through the inside of the image pickup unit 1210 and further out of the image pickup unit 1210. Radiation that has penetrated the inside of the imaging unit 1210 and radiation that has penetrated to the outside of the imaging unit 1210 is scattered by the wall surface or the floor of the back surface of the imaging unit 1210, returns to the inside from the back surface of the imaging unit 1210, and enters the sensor 1211. As a result, the scattered radiation is also reflected as a radiation image, which leads to deterioration of image quality. Therefore, in order to block the incidence of scattered radiation on the sensor 1211,
In general, it is possible to prevent the transmission of radiation to the outside of the imaging unit 1210,
In addition, the radiation shield 121 that shields the incidence of scattered radiation
6 to cover the entire area of the sensor 1211
Formed on the inner wall of. Similarly, when a photosensitive film is used, a radiation shield 1216 is arranged on the back side of the film to prevent the scattered radiation from being reflected in the radiation image.

[0008]

Conventionally, the radiation image capturing apparatus has been used by being installed in a radiation room, but in recent years, in order to enable rapid and wide-range image capturing, a portable radiation image capturing apparatus is used. There is a growing demand for devices. There is also a demand for a radiation image capturing apparatus in which one image capturing unit is installed on a plurality of image capturing gantry units to capture images of various parts in terms of cost.

For an operator such as a radiological technologist, the portable radiographic image capturing apparatus (also referred to as an electronic cassette) and the image capturing section are placed in a predetermined position and the operability of transporting the radiographic image capturing apparatus and the image capturing section is considered. It is desirable to reduce the weight. However, in order to reduce the influence of scattered radiation on the radiation image, a radiation shield is indispensable, and in general,
Since a heavy metal such as lead is used for the radiation shield, the radiation image capturing device and the imaging unit are heavy, resulting in an increased physical burden on the operator and a deterioration in operability.

Therefore, it is an exemplary object of the present invention to provide a highly reliable radiation image capturing apparatus which is excellent in operability and shields scattered radiation and does not cause deterioration in image quality.

[0011]

In order to achieve the above object, a radiographic image capturing apparatus according to one aspect of the present invention forms an image corresponding to the radiation intensity of a predetermined radiation applied to a subject. A radiation image capturing apparatus, wherein a detection unit that detects the radiation intensity of the predetermined radiation, and a detachably provided at a predetermined position on the side facing the irradiation direction of the predetermined radiation via the detection unit, A shielding unit that shields the detection unit from radiation other than the predetermined radiation. According to such a radiation image capturing apparatus, a detection unit that detects the radiation intensity of predetermined radiation,
It is possible to separately handle the shields that shield the detection unit from the radiations other than the predetermined radiations. The shielding unit has a shielding body that shields radiation other than the predetermined radiation, and the shielding body is covered with resin. This protects the shield and improves the slidability of the surface of the shield. The resin is further coated with a fluororesin. This allows
Further, the slidability of the surface of the shielding part is improved. The shielding portion has a groove parallel to the attaching / detaching direction.
As a result, the surface area of the shield in the attaching / detaching direction of the shield is reduced, and the resistance due to friction during attachment / detachment is reduced. The shielding unit may further include a storage unit that detachably stores the detection unit. The shielding portion is formed of a shielding body that shields radiation other than the predetermined radiation covered with resin, and the storage portion is a space formed in the resin into which the detection portion can be removably inserted. Is characterized by. This makes it possible to keep the positional relationship between the detection unit and the shielding unit constant at the time of photographing, while separately handling the detection unit and the shielding unit. The shield is removable from the shield. Thereby, one shield can be shared by a plurality of shields. The shielding portion further has an opening for a handle.
This improves the handleability of the shield. The detection unit may further include a storage unit that detachably stores the shielding unit. The detector may include a groove into which the shield may be detachably inserted.
This makes it possible to handle the detector and the shield separately.
During shooting, the positional relationship between the detection unit and the shielding unit can be kept constant. The shielding unit includes a frame body that detachably accommodates the detection unit, and a shield body that is provided in the frame body and shields radiation other than the predetermined radiation. The frame body is characterized by having an opening or a slit in a portion corresponding to the housed detection unit. Thereby, the positional relationship between the detection unit and the shielding unit can be kept constant without covering the detection unit. The shielding part can be attached to a standing stand, a lying table, a universal stand, and a cassette holder. As a result, it is possible to use a single image pickup unit as well. The detector and the shield may be attachable to and detachable from each other in a direction orthogonal to the irradiation direction of the predetermined radiation. The shield is a heavy metal made of any one of lead, barium, tantalum, and tungsten.

A further object or other feature of the present invention is that
It will be apparent from the preferred embodiments described below with reference to the accompanying drawings.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A radiographic image capturing apparatus 1 of the present invention will be described below with reference to the accompanying drawings. However, the present invention is not limited to these examples, and each constituent element may be substituted instead as long as the object of the present invention is achieved. For example, in the embodiment, a radiation image capturing apparatus that obtains a radiation digital image is described as an example, but the invention can be applied to a radiation image capturing apparatus that uses a photosensitive film described in the related art.

Here, FIG. 1 is a schematic sectional block diagram of a radiation image capturing apparatus 1 of the present invention. The radiation image capturing apparatus 1 includes an image capturing unit 100 and an image capturing unit 1 as shown in FIG.
00 and a shielding part 200 that can be separated. The radiation image capturing apparatus 1 is provided with an upper surface 1 of the image capturing unit 100 when the subject is irradiated with
After passing through the image pickup unit 100 that forms an image of a subject from a predetermined radiation X that is incident on the image pickup unit 100 from 00a and the image pickup unit 100 that adversely affects the formation of the image, the image pickup unit 100 scatters on a wall surface, a floor, or the like and is again image pickup unit An operator of the radiation image capturing apparatus 1, such as a radiologist, handles the radiation image capturing apparatus 1 such as a radiologist at the same time by separately configuring the shield unit 200 that shields the radiation Y except the predetermined radiation X that is incident on the imaging unit 100 from the bottom surface 100b of 100. The device weight is reduced.

The image pickup unit 100 includes a radiation image detector 110.
A support mechanism 120, a circuit board 130, an insulating sheet 140, a flexible circuit board 150, and an insulator 16.
0 and a housing 170 are formed, and a radiation image is formed from a predetermined radiation X applied to a subject.

The radiation image detector 110 generally has a phosphor 112 for converting radiation into visible light, a photoelectric conversion element 114 for converting visible light into an electric signal, and a photoelectric conversion element 114.
Is formed of the substrate 116. Radiation image detector 1
In 10, the phosphor 112 emitted by the irradiation of the radiation X
Visible light is incident on the photoelectric conversion element 114, and an electric signal corresponding to the intensity of the incident visible light is output.

As the phosphor 112, a phosphor of a metal compound (for example, GdO ₂ S: Tb, CaWO ₄ , C ₅ I:
A resin plate coated with Tl, CaI: Na or the like) is used. Photoelectric conversion element 114 bonded to phosphor 112
Is formed on the front surface of the transparent substrate 116 by a semiconductor process (ie,
It is formed in a two-dimensional array by the photolithography method. As the substrate 116, a glass plate is generally used because it has no chemical reaction with the semiconductor element, can withstand the temperature of the semiconductor process, and has dimensional stability.

The support mechanism 120 has a base 122, support columns 124, and screws 126 to support the radiation image detector 110. The metal base 122 supports the radiation image detector 110 on the surface, and is fixed to the housing 170 via the support pillars 124 and the screws 126 attached to the side surfaces of the base 122.

The circuit board 130 is a circuit board which is connected to the photoelectric conversion element 114 by the flexible circuit board 150 and has an electronic component 132 for processing the electric signal converted by the photoelectric conversion element 114. Circuit board 13
Reference numeral 0 denotes a single-sided mounting substrate, which is fixed on the non-mounting surface (that is, the surface on which the electronic component 132 is not mounted) in a planar manner in close contact with the base 122 via the insulating sheet 140. The electronic component 132 is an amplifier that amplifies an electric signal from the photoelectric conversion element 114, an A / D circuit that digitally converts the output from the amplifier, a serialization circuit that serializes image data digitized by the A / D circuit, and the like. .

The insulating sheet 140 is made of, for example, rubber or quartz glass, and has a metal base 122 and a circuit board 13.
0 (the electronic component 132 mounted therein) is disconnected from the electrical connection.

The flexible circuit board 150 is a circuit board on which a signal line and a control line for reading out an electric signal from the photoelectric conversion element 114 are wired and on which an electronic component 152 is mounted. A plurality of flexible circuit boards 150 are arranged on the outer periphery of the board 116, pass the side of the base 122, and move to the base 12.
The circuit board 130 arranged on the back surface of the second wiring 2 is routed. The electronic component 152 is a drive circuit or the like that drives the radiation image detector 110. Flexible circuit board 15
Also in 0, the region where the electronic component 152 is mounted is fixed in close contact with the base 122 via the insulator 160.
The metal base 122 and the electronic component 152 are electrically isolated by the insulator 160.

The housing 170 includes the radiation image detector 110,
Support mechanism 120, circuit board 130, and insulating sheet 14
0, the flexible circuit board 150, and the insulator 160 are housed. The housing 170 includes a housing base 172 that fixes the support mechanism 120 via the support columns 124 and screws 126 attached to the side surface of the base 122, and a housing lid 174 that is transparent to the radiation X. Have.

The shielding unit 200 is a bottom surface 10 of the image pickup unit 100.
0b is separably arranged. The shield unit 200 has a shield 210 and a resin 220, and shields the radiation image detector 110 from the radiation Y other than the predetermined radiation X.

The shield 210 is made of a material having a high radiation shielding performance, for example, a heavy metal such as lead, barium, tantalum, or tungsten. Shield 210
In order to shield the radiation image detector 110 from the radiation Y, is formed in a flat plate shape having an area larger than the area of the radiation image detector 110 detecting the radiation X.

The resin 220 is made of a material such as PC or PET. The shield 210 is formed in a thin sheet shape, and is covered with a resin 220 for reinforcing it so as not to rub or lose its shape when being attached and detached. Further, the resin 220 protects the operator from directly touching the shield 210 when the shield 210 is made of a substance such as lead that affects the human body.

The surface of the shield 210 may be further coated with, for example, a fluororesin to improve the slidability of the shield.

At the time of radiography, a case where a subject is photographed in a lying position will be described as an example. First, the operator of the radiographic image capturing apparatus 1 places the shield unit 200 under the subject.
To place. After that, the imaging unit 100 is installed so as to be embedded between the subject and the shielding unit 200. Then, the subject is irradiated with the radiation X.

The radiation X partially absorbed by the subject and transmitted through the subject carries information (radiation image information) on the internal structure of the subject. Radiation X transmitted through the subject
Enters the radiation image detector 110 after passing through the upper surface 100a of the image pickup unit 100 kept light tight. The radiation X incident on the radiation image detector 110 is converted into visible light by the phosphor 112. This visible light has radiation image information of the subject, and the photoelectric conversion element 1 of the radiation image detector 110
Detected by 14. The detection signal is read out to the flexible circuit board 150 as an electric signal corresponding to the emission intensity of the phosphor 112, and various processing is performed by the electronic component 132 mounted on the circuit board 130. as a result,
Radiation image information of the subject can be obtained.

On the other hand, the radiation X that has passed through the image capturing unit 100 is scattered by the wall surface, the floor, etc., and then becomes the radiation Y that travels toward the image capturing unit 100 again. However, the radiation Y is shielded by the shielding unit 200 arranged on the bottom surface 100b of the imaging unit 100 and does not enter the radiation image detector 110. as a result,
Radiation Y does not appear in the obtained radiation image information.

As described above, the image pickup section 100 and the shielding section 20
Since 0 can be separated and each can be handled separately, the weight handled by the operator at one time can be reduced as compared with the conventional case in which the imaging unit 100 and the shielding unit 200 are integrally formed. Therefore, it is possible to improve operability in terms of physical load on the operator. Furthermore, if the surface of the shielding unit 200 is coated with a fluororesin having good slidability, the resistance due to friction during insertion of the imaging unit 100 and the shielding unit 200.
It is possible to reduce the resistance due to friction when the is placed under the subject, and to improve the operability. Further, since the shielding unit 200 shields the radiation Y other than the predetermined radiation X, it is possible to prevent deterioration of the obtained radiation image.

Next, referring to FIGS. 2 and 3, the shield 2
The shielding units 200A and 200B, which are modified examples of No. 00, will be described. Both are modified examples in which operability is improved when the image pickup unit 100 and the shielding units 200A and 200B are put in and out of the subject with respect to the image pickup unit 100 shown in FIG. The same members as those of the shielding unit 200 are designated by the same reference numerals, and overlapping description will be omitted. Here, in FIG.
A shielding unit 200 which is a modified example of the shielding unit 200 shown in FIG.
It is a schematic perspective view and schematic enlarged sectional view of A. FIG. 3 is a shield 200B that is a modification of the shield 200 shown in FIG.
2 is a schematic perspective view of FIG.

Referring to FIG. 2, the shield portion 200A comprises a shield 210 and a resin 220 covering the shield 210. A plurality of grooves 222 parallel to one direction are formed on the surface of the resin 220. By inserting the shield part 200 along the direction parallel to the groove 222, the surface area in the insertion direction (that is, the attaching / detaching direction of the shield part 200A) can be reduced. Therefore, the resistance due to friction is reduced, and the shielding portion 100A has improved sliding performance as compared with the shielding portion 200. Further, it is also possible to improve the sliding performance by forming a groove in the imaging unit 100 and fitting and sliding the groove 222 in the shielding unit 200A.

On the other hand, referring to FIG. 3, the shielding portion 200B
Is the shield 210 and the resin 2 covering the shield 210.
It consists of twenty. The shield part 200B is the shield 2
Both sides of 10 (that is, the resin 220 outside the shield 210)
An opening 224 for a handle is formed in the area). Therefore, in the shielding unit 200B, the operator operates the shielding unit 2 below the subject.
Improves handling when putting 00B in and out.

Next, another radiation image pickup device 2 will be described with reference to FIG. FIG. 4 is a schematic perspective view of another radiation image pickup device 2 of the present invention. The radiation image pickup device 2 of FIG. 4 is similar to the radiation image pickup device 1 of FIG. 1, but the structure of the shielding unit 200 is different. The same members as those shown in FIG. 1 are designated by the same reference numerals, and a duplicate description will be omitted.

Referring to FIG. 4, the radiation image pickup device 2 is shown.
Makes it possible to separate the imaging unit 100 and the shielding unit 300. The shielding unit 300 includes an opening 310 having one end 300a opened to allow the image capturing unit 100 to be inserted, and the image capturing unit 1.
Storage unit 320 formed to have a size capable of storing 00
Have and. A shield 210 is included in the surface 300b of the shield 300 corresponding to the bottom surface 100b of the imaging unit 100. On the contrary, the incident surface side of the radiation X, that is, the imaging unit 100.
Surface 300c of the shield 300 corresponding to the upper surface 100a of the
Is a resin having a thin base material. The image capturing unit 100 is inserted into the storage unit 320 at the time of shooting, but the surface 300 of the shielding unit 300 is
Since c (the incident surface side of the radiation X) is a thin resin, it hardly affects the transparency of the radiation X. Further, the transmission of the radiation X to the bottom surface 100b of the imaging unit 100 is prevented by the shield 2.
The scattered radiation Y itself which is reduced by 10 and returns at the same time can be suppressed, and a good image can be obtained.

Further, since the shielding section 300 stores the image pickup section 100 in the storage section 320, the positional relationship between the shield 210 and the image pickup section 100 can be maintained to some extent. In the radiation image capturing apparatus 1 of FIG. 1, the shielding unit 200 needs to be larger than the region of the radiation image detecting unit 110 that detects the radiation X so that the positional deviation from the image capturing unit 100 can be allowed to some extent. However, in the radiographic image capturing apparatus 2, the positional relationship between the shielding unit 300 and the image capturing unit 100 may not be taken into consideration, and the size of the shield 210 is also the radiation image detecting unit 1.
It is sufficient to have a size slightly larger than the area of 10 radiation X detected.

The shield 300 has surfaces 300b and 300c.
An opening 330 for a handle is formed on one side of the. Opening 3
30 is the enclosed shield 21 on the surface 300b.
0 outside the plane 0, and in the plane 300c, the plane 300
It is formed in the vertical direction of the place formed in b. Therefore,
The shielding unit 300 improves the handleability when the operator inserts and removes the shielding unit 300 in which the imaging unit 100 is stored in the storage unit 320 below the subject.

Next, with reference to FIG. 5, a shield 300A which is a modification of the shield 300 will be described. The shield 3
The same members as those of 00 are denoted by the same reference numerals, and the duplicated description will be omitted. Referring to FIG. 5, the shielding unit 30
0A is an opening 310 for inserting the imaging unit 100.
And a storage portion 340 for storing the shield 210.

The storage section 340 is a bottom surface 10 of the image pickup section 100.
It is provided at a location corresponding to 0b. Also, the storage unit 340
A slit 350 is formed in the. Therefore, the shield part 300A allows the shield 210 to be attached to and detached from the storage part 340 via the slit 350.

In the shielding unit 300A, the subject is the image pickup unit 100.
You can keep it in a hygienic condition by avoiding direct contact with
Moreover, since the shield 210 is removable, it can be used as a disposable cover.

Next, another radiation image capturing apparatus 3 will be described with reference to FIG. FIG. 6 is a schematic perspective view of another radiation image pickup device 3 of the present invention. The radiation image capturing apparatus 3 in FIG. 6 is the same as the radiation image capturing apparatus 1 in FIG. 1, but the structure of the image capturing unit 100 is different. The same members as those shown in FIG. 1 are designated by the same reference numerals, and a duplicate description will be omitted.

Referring to FIG. 6, the radiation image pickup device 3 is provided.
Is divided into an image capturing section 400 and a shield 210. The bottom surface 400 of the imaging unit 400 on which the radiation Y is incident is opposed to the top surface 400a of the imaging unit 400 on which the radiation X is incident.
A groove 410 is provided in b. Imaging unit 400
The bottom surface 400b and the groove 410 allow the shield 210
A storage portion 420 for storing the is formed. The image capturing unit 400 is
The shield part 210 is guided by the groove part 410, and
0 can be inserted into the storage portion 420 of the bottom portion 400b.

First, the procedure is to install the image pickup section 400 at a predetermined position and insert the shield 210 into the storage section 420 later. At this time, the shield 210 is inserted through the groove 410.
The load resistance to insert is small. In addition, the imaging unit 40
Since the positional relationship between 0 and the shield 210 can be kept constant by the storage section 420, the area of the shield 210 can be minimized and the shield 210 can be made lighter.

Next, another radiation image capturing apparatus 4 will be described with reference to FIG. FIG. 7 is a schematic perspective view of another radiation image pickup device 4 of the present invention. The radiation image pickup device 4 of FIG. 7 is similar to the radiation image pickup device 1 of FIG. 1, but the structure of the shielding unit 200 is different. The same members as those shown in FIG. 1 are designated by the same reference numerals, and a duplicate description will be omitted.

Referring to FIG. 7, the radiation image capturing apparatus 4
Is divided into an image capturing section 100 and a shielding section 500.
The frame body 510 forming the shielding portion 500 is formed of a metal plate, and has both sides bent into a substantially U-shape to form a U-shaped groove 510a as shown in FIG. The shield 210 is fixed to the inside 510 b of the frame 510, and the imaging unit 100 is guided by the U-shaped groove 510 a to guide the frame 51.
It is inserted and positioned in the inside 510b of 0. At this time, the shield 210 is located on the bottom surface 100b of the imaging unit 100 and can suppress the incidence of the radiation Y. Also in this case, since the positional relationship between the imaging unit 100 and the shield 210 can be kept constant as in the radiation image capturing apparatus 3 shown in FIG. 6, the area of the shield 210 can be minimized. Therefore, the shield 210 can be reduced in weight.

Next, another radiation image capturing apparatus 5 will be described with reference to FIG. The radiation image capturing apparatus 5 is premised on that one imaging unit is installed on a plurality of mounts.
Here, FIG. 8 is a schematic sectional view of another radiation image capturing apparatus 5 of the present invention. The same members as those shown in FIG. 1 are designated by the same reference numerals, and a duplicate description will be omitted.

Referring to FIG. 8, the standing stand S in the photographing room.
And there is a photographing table for the supine table D, and one imaging unit 10
An imaging system that is also used as 0 is configured.
Holder parts 600 and 700 are fixed to the upright stand S and the recumbent table D. Holder parts 600 and 700
A shield 210 is attached to the interiors 600a and 700a of the. As shown in FIG. 7, the holder parts 600 and 700 are formed of a metal frame, and the inside 600a
And U-shaped groove 61 bent to 700a in a U shape
The imaging unit 100 can be installed by inserting the imaging unit 100 from the side along 0 and 710 (that is, the direction perpendicular to the incident direction of the radiation X).

In FIG. 8, the image pickup unit 100 is installed on the upright stand S, but when used in the lying position table D, only the image pickup unit 100 is pulled out and the holder unit provided in the lying position table D. Used by mounting on 700. Therefore, since the shield 210 required for photographing is attached to each pedestal, the operator does not include the shield 210 and the weight of the imaging unit 10 is reduced.
Only 0 should be transported and operated, which reduces the physical burden.

Although not shown, a universal arm, a C arm, a cassette holder or the like can be used as a pedestal with the same structure.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to these, and various modifications and changes can be made within the scope of the gist thereof.

[0051]

According to the radiation image capturing apparatus of the present invention,
The separate configuration of the imaging unit and the shield makes it possible to handle each separately and reduce the weight that the operator needs to handle at one time, thus improving operability in terms of physical burden on the operator. Can be improved.

Further, by improving the slidability of the surface of the shielding portion, it is possible to reduce the resistance when the photographing portion is inserted. Further, by storing the image pickup unit in the shield unit, the positions of the image pickup unit and the shield unit are determined, and the area of the shield unit can be minimized. Therefore, the weight of the shield unit itself can be suppressed. .

[Brief description of drawings]

FIG. 1 is a schematic sectional block diagram of a radiographic image capturing apparatus of the present invention.

2A and 2B are a schematic perspective view and a schematic enlarged cross-sectional view of a shield part which is a modification of the shield part shown in FIG.

FIG. 3 is a schematic perspective view of a shield portion which is still another modification of the shield portion shown in FIG.

FIG. 4 is a schematic perspective view of another radiation image capturing apparatus of the present invention.

5 is a schematic perspective view of a shield portion that is a modified example of the shield portion shown in FIG.

FIG. 6 is a schematic perspective view of still another radiation image capturing apparatus of the present invention.

FIG. 7 is a schematic perspective view of still another radiation image capturing apparatus of the present invention.

FIG. 8 is a schematic cross-sectional view of still another radiation image capturing apparatus of the present invention.

FIG. 9 is a system configuration diagram of a conventional imaging system.

FIG. 10 is a schematic cross-sectional block diagram of an imaging unit of a conventional radiographic image capturing apparatus.

[Explanation of symbols]

1, 2, 3, 4, 5 Radiation image photographing device 100, 400 Imaging unit 110 Radiation image detector 200, 300, 500 Shielding unit 210 Shielding body 220 Resin 600, 700 Holder unit

Claims (15)

[Claims] 1. A radiation image capturing apparatus for forming an image corresponding to a radiation intensity of a predetermined radiation applied to an object, the detection unit detecting the radiation intensity of the predetermined radiation, and the detection unit. Radiation characterized in that it has a shield part that is detachably provided at a predetermined position on the side opposite to the irradiation direction of the predetermined radiation through the shield, and that shields the detection part from the radiation other than the predetermined radiation. Image capture device. 2. The radiation image capturing apparatus according to claim 1, wherein the shielding unit has a shielding body that shields radiation other than the predetermined radiation, and the shielding body is covered with resin. . 3. The radiation image capturing apparatus according to claim 2, wherein the resin is further coated with a fluororesin. 4. The radiation image capturing apparatus according to claim 1, wherein the shield portion has a groove parallel to the attachment / detachment direction. 5. The shielding unit further includes a storage unit that detachably stores the detection unit.
The radiographic image capturing apparatus described. 6. The shield part is composed of a shield that shields radiation other than the predetermined radiation covered with resin, and the storage part is formed of the resin into which the detection part can be removably inserted. The radiation image capturing apparatus according to claim 5, wherein the radiation image capturing apparatus is a space. 7. The radiographic image capturing apparatus according to claim 6, wherein the shield is removable from the shield. 8. The radiation image capturing apparatus according to claim 1, wherein the shielding portion further has an opening for a handle. 9. The detection unit further includes a storage unit that detachably stores the shield unit.
The radiographic image capturing apparatus described. 10. The radiation image capturing apparatus according to claim 9, wherein the detection unit has a groove into which the shield unit can be detachably inserted. 11. The shield unit includes a frame body that detachably accommodates the detection unit, and a shield body that is provided in the frame body and shields radiation other than the predetermined radiation. The radiographic image capturing apparatus according to claim 1. 12. The radiographic image capturing apparatus according to claim 11, wherein the frame has an opening or a slit in a portion corresponding to the housed detection unit. 13. The radiation image capturing apparatus according to claim 1, wherein the shield is attachable to an upright stand, a lying table, a universal stand, and a cassette holder. 14. The detector and the shield are attachable to and detachable from each other in a direction orthogonal to an irradiation direction of the predetermined radiation.
The radiation image capturing apparatus according to any one of the above. 15. The shield according to claim 2, wherein the shield is a heavy metal made of any one of lead, barium, tantalum and tungsten. Radiation imager.