JP5254918B2 - Radiation imaging equipment - Google Patents

Description

  The present invention relates to a radiographic imaging apparatus having a radiation detector that detects radiation transmitted through a subject.

  2. Description of the Related Art In the medical field, a radiographic imaging system that irradiates a subject with radiation and guides the radiation transmitted through the subject to a radiation detector to capture a radiographic image is widely used. In this case, as the radiation detector, a radiation detector that directly converts radiation into an electrical signal, or a radiation detector that converts visible light into visible light with a scintillator and then converts visible light into an electrical signal with a photoelectric conversion unit, etc. It has been known.

  As a radiographic imaging apparatus, an apparatus in which a scintillator is attached to a top plate of a housing with an adhesive (see Patent Document 1) is disclosed.

  In addition, as a technique related to the attachment of the radiation detector, a technique (see Patent Document 2) in which a scintillator panel is detachable from a sensor panel having a photoelectric conversion element, and an adhesive component penetrates into a base material having air permeability. The technique (refer patent document 3) which adhere | attaches the sensor panel equivalent to the said radiation detection part to a supporting member using the resin layer comprised by doing is disclosed.

  On the other hand, in the field of liquid crystal display devices, a TFT (Thin Film Transistor) substrate is adhered to a backlight structure using a weak adhesive material layer, so that the TFT substrate can be peeled from the backlight structure. (Refer to Patent Document 4), or a technique of providing an inner seal portion at the center of the substrate and an outer peripheral seal portion surrounding the inner seal portion so as to form an opening for injecting liquid crystal (Patent Document) 5) is known.

US Patent Application Publication No. 2009/0122959 JP 2006-337184 A JP 2008-224429 A Japanese Utility Model Publication No. 6-76347 JP 2002-98978 A

  In the radiographic imaging device of Patent Document 1 described above, since the scintillator attached to the top plate of the casing cannot be peeled off, the scintillator is attached to the top plate between the top plate and the scintillator. When a foreign object such as a metal piece that absorbs radiation enters the gap, the foreign substance cannot be removed from the gap. Therefore, the foreign matter mixed in the gap may be displayed on the radiographic image, and the quality of the radiographic image may be deteriorated.

  Moreover, in the radiographic imaging device of Patent Literature 1, when the scintillator is detachably attached to the top plate of the housing using the technology of Patent Literature 2, foreign matter mixed in the gap can be removed. .

  However, when air remains between the top plate and the scintillator in a state where the scintillator is attached to the top plate, if the air pressure in the housing changes due to the usage environment of the radiographic apparatus, the remaining The pressure of the air that has been increased becomes higher than the atmospheric pressure (external atmospheric pressure) in the casing, and the adhesion (adhesion strength, adhesion, and tackiness) of the scintillator to the top plate may be reduced. Depending on the usage environment of the radiographic imaging apparatus, the scintillator may be peeled off from the top plate due to a change in atmospheric pressure. Such a problem may also occur when the technique of Patent Document 4 is used in the radiation image capturing apparatus of Patent Document 1.

  On the other hand, according to the technique of Patent Document 3, since the sensor panel is bonded to the support member using a resin layer having air permeability, air is present on the contact surface of the resin layer with respect to the sensor panel and the support member. Even if it remains, the remaining air can escape through the resin layer.

  However, when the support member and the center panel are arranged so that the radiation transmitted through the subject is irradiated to the center panel after passing through the support member, foreign matter (fine metal powder or the like) is placed on the resin layer. ) May deteriorate the quality of the radiation image.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a radiographic imaging apparatus capable of preventing a decrease in adhesiveness of a radiation detector due to a change in atmospheric pressure while suppressing contamination with foreign matter that leads to a degradation in the quality of radiographic images.

  A radiographic imaging apparatus according to the present invention includes a support member having a transmission surface through which radiation transmitted through a subject is transmitted, a radiation detector that detects radiation transmitted through the transmission surface, the radiation detector, and the transmission surface. An adhesive member that releasably adheres the radiation detector to the support member so that an internal space is formed therebetween, and the internal space and the outside communicate with each other, and foreign matter enters the internal space from the outside. And a ventilation means for preventing the above.

  According to the radiographic imaging device of the present invention, the radiation detector is bonded to the support member so that an internal space is formed between the radiation detector and the transmission surface using an adhesive member. Even if air remains on the contact surface of the adhesive member with respect to the radiation detector and the support member, the remaining air can be released to the internal space. Further, since the internal space communicates with the outside through the ventilation means, the pressure in the internal space and the external atmospheric pressure can be kept constant even when the atmospheric pressure changes. Therefore, it can prevent that the adhesiveness of the radiation detector with respect to a support member falls by atmospheric pressure change. Further, since the ventilation means prevents foreign matters from entering the internal space from the outside, it is possible to eliminate the concern that foreign matters such as metal pieces that absorb radiation enter the internal space and are displayed in the radiation image. . Accordingly, it is possible to suppress the contamination of foreign matters that leads to the deterioration of the quality of the radiation image.

  The ventilation means can take various forms. For example, a communication path that is formed in the adhesive member and communicates with the internal space and the outside is provided as the ventilation means, and the communication path may be bent.

  In this case, since the communication path is bent, it is possible to prevent the foreign matter from entering the internal space even when foreign matter flows into the communication path from the outside together with air. This is because the mass of the foreign matter is larger than the mass of air, so that the foreign matter cannot follow the flow of air flowing through the bent portion of the communication path. Further, since the communication path is formed in the adhesive member, the foreign matter is likely to adhere to the wall surface of the communication path. Accordingly, the foreign matter that can no longer follow the air flow at the bent portion of the communication passage is reliably captured by the wall surface of the communication passage having adhesiveness. Thereby, it is possible to further ensure the contamination of the foreign matter into the internal space.

  Further, as the ventilation means, a communication path formed in the adhesive member and communicating the internal space and the outside, and an air flow between the communication path and the outside are permitted, and from the outside to the communication path And a filter member for preventing foreign matter from entering. Thereby, it is possible to realize communication between the internal space and the outside and prevention of foreign matter from entering the internal space from the outside with a simple configuration.

  In one aspect of the present invention, the radiation detector converts a radiation transmitted through the subject into visible light, and converts the visible light provided in the scintillator and converted by the scintillator into an electrical signal. A conversion part, and the conversion part may be bonded to the support member with the adhesive member.

  In general, the scintillator is more fragile than the conversion unit. Therefore, when the scintillator is bonded to the support member, the scintillator may be damaged when the radiation detector is peeled off. However, according to this embodiment, since the conversion unit is bonded to the support member, it is possible to eliminate the concern that the scintillator is damaged when the radiation detector is peeled off.

  In the above embodiment, the radiation detector is located on the opposite side of the conversion unit with the scintillator interposed therebetween, and a contact member that contacts the scintillator, and a pressing unit that can press the contact member to the conversion unit side. , May further be included.

  According to this aspect, when the contact member is pressed to the conversion unit side by the pressing means, the scintillator is held between the conversion unit and the contact member, so that the conversion unit, the scintillator, and the contact member are integrated. . Thereby, the rigidity of a radiation detector can be improved compared with the case where a scintillator is made to adhere to a conversion part with an adhesion member etc. Further, when the pressing of the contact member is released, the scintillator and the conversion unit are separated. As a result, when one of the scintillator and the conversion unit fails, the other can be reused. Furthermore, since the scintillator is not bonded to the conversion unit using an adhesive member or the like, the scintillator is not damaged when the scintillator is removed from the conversion unit.

  By the way, in the radiographic imaging apparatus, the part through which the radiation of the housing transmits (the top plate having a transmission surface) is likely to be scratched because a subject may be placed thereon. When the top plate of the casing is scratched, the scratch may be displayed on the radiographic image as fixed pattern noise. Therefore, it is desirable to replace the casing (top plate). However, when the radiation detector is pasted to the top plate of the housing in an inseparable manner, when the housing is replaced, it is necessary to replace the expensive radiation detector together and there is a problem that costs increase. .

  One form of this invention WHEREIN: The housing | casing which accommodates the said radiation detector may be sufficient as the said supporting member. As a result, the radiation detector can be peeled off from the casing, so that the casing can be efficiently replaced.

  The said form WHEREIN: The said housing | casing may be comprised with the material containing a reinforced fiber resin. Thereby, the intensity | strength of a housing | casing can be made high compared with the case where a housing | casing is comprised with a carbon single-piece | unit etc. FIG.

  Further, in the above embodiment, the casing is a plate-shaped first member that faces the radiation detector, and a second member that is erected on the periphery of the first member so as to be integrated with the first member. And may be provided.

  According to this aspect, the strength of the housing can be increased as compared with the case where the housing is configured such that the first member and the second member are separated.

  In one embodiment of the present invention, the adhesive member may be made of a material whose adhesive force changes when an external factor acts.

  According to this aspect, since the adhesive force of the adhesive member can be changed, for example, when the radiation detector is peeled from the support member, the adhesive force of the adhesive member is reduced, or the radiation detector is supported. When adhering to a member, the adhesive force of the adhesive member can be increased. Thereby, it is possible to eliminate the concern that the radiation detector is damaged at the time of peeling from the support member of the radiation detector, or that the radiation detector adhered to the support member is peeled off without intention.

  As described above, according to the present invention, since the internal space is formed between the radiation detector and the transmission surface, it remains on the contact surface of the adhesive member with respect to the radiation detector and the support member. Air can escape to the internal space. Further, since the internal space and the outside communicate with each other by the ventilation means, it is possible to prevent the adhesiveness of the radiation detector to the support member from being lowered due to a change in atmospheric pressure. Furthermore, since the ventilation means prevents foreign matter from entering the internal space from the outside, foreign matter that leads to deterioration in the quality of the radiation image can be suppressed.

It is a block explanatory view of a radiographic imaging system to which a radiographic imaging device concerning a 1st embodiment is applied. It is a perspective view of a cassette body concerning a 1st embodiment. It is sectional drawing along the III-III line of FIG. It is the top view which looked at the upper member by which the radiation detector was adhere | attached on the permeation | transmission surface part from the inner side. It is a perspective view of a radiation detector and an upper member. In the cassette which concerns on 1st Embodiment, it is a partially-omission enlarged plan view which looked at the upper member from the inner side. It is a perspective view of the upper member attached with the positioning member. It is explanatory drawing which shows the state which attached the assembly jig to the scintillator. It is explanatory drawing which shows the state which adhere | attached the conversion part on the permeation | transmission surface part. It is explanatory drawing which shows the state which peels a radiation detector from a permeation | transmission surface part. It is explanatory drawing which shows the modification of 1st Embodiment. In the cassette which concerns on 2nd Embodiment, it is the top view which looked at the upper member from the inner side. In the cassette which concerns on 3rd Embodiment, it is a partially-omission enlarged plan view which looked at the upper member from the inner side. It is a partially-omission cross-sectional explanatory drawing of the cassette main body which concerns on 4th Embodiment. It is a partially-omitted cross-sectional explanatory drawing which shows the modification of the housing | casing which the cassette concerning this invention has. It is explanatory drawing which shows the modification of the housing | casing of the cassette which concerns on this invention. It is explanatory drawing which shows the modification different from FIG. 14 of the housing | casing of the cassette concerning this invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(First embodiment)
First, a radiographic imaging system according to a first embodiment and a radiographic imaging system to which the radiation detection apparatus is applied will be described with reference to FIGS. The radiographic image capturing apparatus according to the present embodiment is used as a portable radiographic image capturing apparatus, and is also used for standing position photographing, lying position photographing, special photographing, or the like.

  As shown in FIG. 1, the radiographic imaging system 10 includes an imaging table 14 on which a subject 12 lies on a floor or the like of a hospital, and radiation 16 having a dose according to imaging conditions. A radiation source 18 for irradiating, a radiation image capturing device (cassette, radiation detection device, radiation detection cassette) 20 for converting radiation 16 transmitted through the subject 12 into an electrical signal (radiation image information), a radiation source 18 and a cassette 20 and a monitor 24 provided on the console 22. A cassette placement section 26 in which the cassette 20 is placed is formed on the photographing table 14.

  The cassette 20 includes a cassette body 28 that is irradiated with the radiation 16 that has passed through the subject 12, and a cable portion 30 that connects between the cassette body 28 and the console 22. The console 22 supplies power to the cassette body 28 via the cable unit 30 and displays a radiation image on the monitor 24 based on the electrical signal converted by the cassette 20.

  As shown in FIG. 2, the cassette body 28 has a casing 32 as a support member formed in a substantially rectangular shape in plan view. The casing 32 includes an upper member 34 to which the radiation 16 is irradiated and an upper member 34. A lower member 36 corresponding to the member 34 is provided.

  The upper member 34 includes a transmission surface portion 38 as a first member having a transmission surface 37 (see FIGS. 3 and 5 and the like) through which the radiation 16 is transmitted, and a second member erected on the periphery of the transmission surface portion 38. The lower member 36 includes a back surface portion 42 that faces the transmission surface portion 38, and a lower side surface portion 44 that is erected on the periphery of the back surface portion 42 so as to correspond to the upper side surface portion 40. have. As shown in FIG. 3, the transmission surface portion 38 and the upper side surface portion 40, the back surface portion 42 and the lower side surface portion 44 are integrally formed. That is, the upper member 34 and the lower member 36 each have a monocoque structure. As a result, the strength (rigidity) of the upper member 34 is increased and the thickness of the upper member 34 is reduced as compared with the case where the upper member 34 is configured so that the transmission surface portion 38 and the upper side surface portion 40 are separate. Can do. The same applies to the lower member 36.

  As shown in FIG. 3, the upper side surface portion 40 and the lower side surface portion 44 are connected in a detachable state by a connecting member 46 provided inside the housing 32. As a result, a space (external space) A for accommodating various components is formed inside the housing 32.

  The housing 32 is made of, for example, carbon fiber (carbon fiber), aluminum, magnesium, bionanofiber (cellulose microfibril), or a composite material in order to reduce the weight of the entire cassette 20.

  As the composite material, for example, a material including a reinforced fiber resin is used, and the reinforced fiber resin includes carbon, cellulose, and the like. Specifically, as the composite material, carbon fiber reinforced plastic (CFRP), a structure in which a foamed material is sandwiched with CFRP, or a material in which the surface of the foamed material is coated with CFRP is used. In the present embodiment, a structure in which a foam material is sandwiched with CFRP is used. Thereby, compared with the case where the housing | casing 32 is comprised with a carbon single-piece | unit, the intensity | strength (rigidity) of the housing | casing 32 can be improved.

  A support body 48 is disposed on the inner surface of the back surface portion 42 inside the housing 32, and the radiation detector 50, the radiation shielding sheet 52, the heat insulating sheet 54, and the heat diffusion sheet are interposed between the support body 48 and the transmission surface portion 38. 56 are arranged in this order in the irradiation direction of the radiation 16, and a concave portion 60 in which the electric processing portion 58 is disposed is formed on the surface of the support 48 on the back surface portion 42 side.

  The support 48 is made of, for example, a foam material from the viewpoint of weight reduction and absorption of dimensional deviation. In this case, the support 48 is formed in a complicated shape by a method of bonding a plurality of sheets having a single thickness or a method by cutting. The support 48 supports the radiation shielding sheet 52, the heat insulating sheet 54, and the heat diffusion sheet 56.

  The radiation detector 50 is provided on the inner surface of the transmissive surface portion 38, and is provided with a scintillator 62 that converts the radiation 16 that has passed through the subject 12 and the transmissive surface portion 38 into visible light, and is detachable from the scintillator 62. And a converter 64 that converts the visible light converted in 62 into an analog electrical signal. However, the conversion unit 64 may be provided so as not to be peeled from the scintillator 62.

  As shown in FIG. 4, the conversion portion 64 is formed slightly smaller than the transmission surface portion 38, and portions corresponding to the corner portions of the upper member 34 are cut away. Further, the scintillator 62 is formed to be slightly smaller than the conversion unit 64. Thereby, when the cassette main body 28 falls, even if the corner | angular part of the housing | casing 32 deforms plastically, possibility that the radiation detector 50 will be damaged can be reduced.

  As shown in FIG. 3, the conversion unit 64 is provided with a flexible cable 66 that transmits the electric signal converted by the conversion unit 64 to the electric processing unit 58, and the flexible cable 66 is a flexible cable that amplifies the electric signal. A substrate 68 is provided. The converter 64 is connected to the ground plate 72 via the ground cable 70.

  The ground plate 72 is provided on the surface of the support 48 on the back surface portion 42 side, and a through hole 74 is formed in a portion of the back surface portion 42 facing the ground plate 72. The ground plate 72 is provided with a heat conducting member 78 connected to a heat radiating plate 76 disposed on the outer surface of the back surface portion 42 so as to block the through hole 74 from the outside (see also FIG. 2). The heat radiating plate 76 and the heat conducting member 78 are made of, for example, metal. Thereby, the housing 32 can be used as the ground of the conversion unit 64 and heat generated by the ground plate 72 can be radiated to the outside.

  The radiation shielding sheet 52 is made of, for example, lead, tungsten, stainless steel, or the like. Thereby, the radiation shielding sheet 52 absorbs the back scattered rays of the radiation 16 and prevents the electric processing unit 58 from being irradiated with the radiation 16 transmitted through the subject 12.

  The heat insulating sheet 54 is made of, for example, urethane or foamed polyethylene. Thereby, heat transfer between the radiation detector 50 and the electric processing unit 58 is suppressed.

  The thermal diffusion sheet 56 is made of a material having a thermal conductivity larger than that of the heat insulating sheet 54 and diffuses the heat of the heat insulating sheet 54.

  The electrical processing unit 58 includes an electronic circuit board 80 provided on the support 48 and an electronic component 82 mounted on the electronic circuit board 80. A spacer 84 is interposed between the electronic circuit board 80 and the back surface portion 42, thereby preventing the electronic component 82 from colliding (contacting) with the back surface portion 42. The electronic component 82 converts the electrical signal transmitted by the flexible cable 66 from an analog signal to a digital signal, distributes the electric power supplied from the cable unit 30 to various components, and sends the converted digital signal to the cable unit 30. Or output.

  As shown in FIGS. 3, 5, and 6, an adhesive member 86 is provided on the inner surface of the transmission surface portion 38 to adhere the conversion portion 64 in a peelable manner. As the adhesive member 86, for example, a double-sided tape is used. In this case, the double-sided tape is formed so that the adhesive force of one adhesive surface is stronger than the adhesive force of the other adhesive surface.

  Specifically, the weak adhesive surface (weakly adhesive surface) is set to 1.0 N / cm or less at 180 ° peel adhesive force. A surface having a strong adhesive force (strongly bonded surface) is in contact with the transmission surface portion 38, and a weakly bonded surface is in contact with the converting portion 64. Thereby, compared with the case where the radiation detector 50 is fixed to the transmission surface part 38 by fixing members, such as a screw, the thickness of the cassette main body 28 can be made thin. Even if the transmission surface 38 is deformed by an impact or a load, the radiation detector 50 follows the deformation of the transmission surface 38 having a high rigidity, so that only a large curvature (a gentle curve) is generated, and a local low curvature is generated. This reduces the possibility of damage to the radiation detector 50. Furthermore, the radiation detector 50 contributes to the improvement of the rigidity of the transmission surface portion 38. The double-sided tape also has an adhesive force on a surface other than the surface in contact with the conversion portion 64 and the transmission surface portion 38.

  Further, as shown in FIG. 5, the adhesive member 86 is disposed along the upper side surface portion 40 in a state of being formed in a band shape. Thereby, the internal space B is formed between the conversion part 64 and the transmission surface part 38 in the state which adhered the conversion part 64 to the transmission surface part 38 (refer also FIG. 3).

  As shown in FIG. 6, the adhesive member 86 is formed with a communication path 88 as a ventilation means for communicating the internal space B and the external space A at a portion corresponding to the corner of the upper member 34. The communication path 88 is bent, and specifically has four corners 90. That is, the communication path 88 has a labyrinth structure formed so as to be bent. In addition, the bending angle of the bent part (corner part 90) of the communication path 88 can be set arbitrarily, and may be bent like a bow. Further, the passage width d of the communication passage 88 is set as narrow as possible within a range where air can flow. However, the passage width d of the communication passage 88 may be set arbitrarily.

  Next, a method for bonding the conversion portion 64 to the transmission surface portion 38 will be described with reference to FIGS.

  As shown in FIG. 7, first, with the adhesive member 86 attached to the inner surface of the transmission surface portion 38, the upper member 34 is placed on a horizontal surface such as the work table 91 so that the inner surface of the transmission surface portion 38 faces vertically upward. Placed on.

  Then, positioning members 92 are attached one by one to the portion corresponding to the long side of the transmission surface 37 and the portion corresponding to the short side of the transmission surface 37 in the upper side surface portion 40. The positioning member 92 is formed in a shape (for example, a U-shaped cross section) that can be fitted into the upper side surface portion 40 from above. Thereby, the positioning member 92 becomes immovable in the thickness direction of the upper side surface portion 40. Note that three or more positioning members 92 may be attached.

  Subsequently, as shown in FIG. 8, an assembly jig 94 is attached to the radiation detector 50 placed on a horizontal surface such as the work table 93. The assembly jig 94 is formed on a plate member 98 provided with a plurality of suction members 96 that are attached to the scintillator 62 on one surface, a handle 100 provided on the other surface of the plate member 98, and the plate member 98. The exhaust passage 102 that opens to the outer surfaces of the adsorption member 96 and the plate member 98 and the on-off valve 104 that opens and closes the exhaust passage 102 are provided.

  Specifically, the operator presses the plate member 98 against the scintillator 62 side after bringing the suction surface of the suction member 96 into contact with the scintillator 62 with the on-off valve 104 opened. As a result, air existing between the suction surface of the suction member 96 and the scintillator 62 is exhausted to the outside through the exhaust passage 102. And after exhausting air to some extent, the on-off valve 104 is closed. Thereby, the adsorbing member 96 is adsorbed to the scintillator 62.

  The assembly jig 94 may have a suction device (not shown) that sucks air existing between the suction surface of the suction member 96 and the scintillator 62. In this case, an operator's burden can be reduced in the adhesion | attachment operation | work to the permeation | transmission surface part 38 of the radiation detector 50. FIG.

  Next, as shown in FIG. 9, the operator moves the assembly jig 94 to which the radiation detector 50 is attached to bring the conversion unit 64 into contact with the adhesive member 86. At this time, the operator moves the radiation detector 50 toward the transmission surface 38 from above with the two positioning members 92 and the converter 64 in contact with each other. Thereby, the radiation detector 50 can be arrange | positioned in a predetermined position.

  Thereafter, the operator opens the on-off valve 104 to remove the assembly jig 94 from the scintillator 62 and removes the positioning member 92. Thereby, the relatively thin radiation detector 50 can be bonded to the transmission surface portion 38 efficiently and accurately.

  In the present embodiment, the radiation detector 50 may not be bonded to the transmission surface portion 38 in a clean room or the like. This is because when a foreign object such as a metal piece that absorbs radiation is mixed between the radiation detector 50 and the transmission surface portion 38, the radiation detector 50 can be peeled off from the transmission surface portion 38 to remove the foreign material.

  By the way, when the radiation detector 50 is peeled from the transmission surface portion 38 so as to directly grip the radiation detector 50, the upper side surface portion 40 of the upper member 34 becomes an obstacle. Therefore, as shown in FIG. 10, an ear 106 may be provided in the conversion unit 64. Thus, the operator can easily peel the radiation detector 50 from the transmission surface portion 38 while holding the ear 106. The ear 106 may be fixed to the conversion unit 64 or may be detachable from the conversion unit 64. In the latter case, it is possible to eliminate the concern that the ear 106 becomes an obstacle when capturing a radiographic image.

  As described above, according to the cassette 20 according to the present embodiment, since the internal space B is formed between the conversion unit 64 and the transmission surface 37, at the time of bonding to the transmission surface unit 38 of the radiation detector 50, Even if air remains on the bonding surface of the bonding member 86 with respect to the conversion portion 64 and the transmission surface portion 38, the remaining air can be released to the internal space B. Also, since the communication path 88 that communicates the internal space B and the external space A is formed in the adhesive member 86, the pressure in the internal space B and the pressure in the external space A can be reduced even when the atmospheric pressure in the external space A changes. Can be kept constant. Thereby, it can prevent that the adhesiveness of the conversion part 64 with respect to the permeation | transmission surface part 38 falls by atmospheric pressure change.

  In the present embodiment, the communication path 88 has a corner 90. Therefore, even when foreign matter having a mass larger than that of air flows into the communication path 88 from the external space A, the foreign matter cannot follow the flow of air flowing through the corner portion 90. Mixing into B can be prevented. As a result, it is possible to suppress contamination of foreign matter that leads to deterioration of the quality of the radiation image.

  Furthermore, since the communication path 88 is formed in the adhesive member 86 and the adhesive member 86 has adhesive force on the entire surface, the foreign matter that cannot follow the air adheres to the wall surface of the communication path 88 at the corner 90. It becomes easy. Therefore, the foreign matter can be reliably captured in the communication path 88. Therefore, it is possible to further ensure the mixing of foreign matter into the internal space B.

  According to the present embodiment, since the passage width d of the communication passage 88 is set as narrow as possible within the range in which air can flow, it is possible to cope with mixing of foreign matters such as relatively small metal powder. If the passage width d of the communication path 88 is set according to the assumed size of the foreign matter, it is possible to efficiently prevent the foreign matter from being mixed.

  Incidentally, the scintillator 62 is generally more fragile than the conversion unit 64. Therefore, when the scintillator 62 is bonded to the transmission surface 38 with the adhesive member 86, the scintillator 62 may be damaged when the radiation detector 50 is peeled off. However, in the present embodiment, since the conversion portion 64 is bonded to the transmission surface portion 38 by the adhesive member 86, the concern that the scintillator 62 is damaged when the radiation detector 50 is peeled can be eliminated.

  Depending on the shooting environment, shooting may be performed with a subject placed on the transmission surface. In this case, the transmission surface portion is easily damaged. When the transmissive surface portion is scratched, the scratch may be displayed on the radiographic image as fixed pattern noise. Therefore, it is desirable to replace the upper member. However, when the radiation detector is affixed to the transmission surface portion so as not to be peeled off, there has been a problem in that when the upper member is replaced, it is necessary to replace the expensive radiation detector together, which increases costs. According to this embodiment, since the radiation detector 50 is detachably bonded to the transmission surface portion 38, the upper member 34 can be exchanged efficiently.

  The present embodiment is not limited to the configuration described above. As shown in FIG. 11, the communication path 108 may have only one corner 110. Thereby, the communication path 108 can be easily formed in the adhesive member 86.

  Further, when the radiation detector is peeled off from the transmission surface portion, an organic solvent or the like may be poured into the adhesive member to weaken the adhesiveness of the adhesive member, and then the radiation detector may be peeled off. In this case, since the adhesive member has corner portions, the organic solvent can easily be soaked into the adhesive member.

(Second Embodiment)
Next, a cassette according to the second embodiment will be described with reference to FIG. In the second embodiment, the same reference numerals are assigned to the same components as those in the first embodiment, and duplicate descriptions are omitted.

  As shown in FIG. 12, in the present embodiment, the configuration of the communication path 112 is different from that of the first embodiment, and a filter member 114 is added. Specifically, the corner portion 110 of the first embodiment is omitted from the communication path 112. And the filter member 114 is affixed on the inner surface of the transmission surface part 38 so that the opening part by the side of the external space A of the communicating path 112 may be plugged up. Further, the filter member 114 is formed with fine holes that allow air to flow between the external space A and the communication path 112 and prevent foreign matters from entering the communication path 112 from the external space A. ing. And thereby, 2nd Embodiment has an effect equivalent to 1st Embodiment. In the present embodiment, the communication path 112 and the filter member 114 correspond to ventilation means.

(Third embodiment)
Next, a cassette according to a third embodiment will be described with reference to FIG. In the third embodiment, the same reference numerals are assigned to the same components as those in the first embodiment, and duplicate descriptions are omitted.

  As shown in FIG. 13, in this embodiment, the filter member 116 is attached to the inner surface of the transmission surface portion 38 so as to close the opening of each communication path 88 on the outer space A side. The filter member 116 is formed with fine holes that allow air to flow between the external space A and the communication path 88 and prevent foreign matters from entering the communication path 88 from the external space A. ing. Thereby, since the foreign material mixed in the communicating path 88 can be suppressed, the effect of suppressing the mixing of foreign material into the internal space B can be further enhanced. In the present embodiment, the communication path 88 and the filter member 116 correspond to ventilation means.

(Fourth embodiment)
Next, a cassette according to the fourth embodiment will be described with reference to FIG. In the fourth embodiment, the same reference numerals are assigned to the same components as those in the first embodiment, and duplicate descriptions are omitted. The present embodiment can also be applied to the second and third embodiments. In FIG. 14, illustrations of components other than the radiation detector are omitted inside the housing for easy understanding.

  As shown in FIG. 14, in this embodiment, the configuration of the radiation detector 118 is different from that of the first embodiment. Specifically, the radiation detector 118 is positioned on the opposite side of the conversion unit 64 with the scintillator 62 interposed therebetween, and the pressing member 120 that contacts the scintillator 62 and the pressing member capable of pressing the contact member 120 toward the conversion unit 64 side. And a member 122. A screw or the like can be used as the pressing member 122. In this case, the contact member 120 can be pressed to the conversion part 64 side by tightening a screw to the conversion part 64 from the back surface part 42 side. If it is difficult to form a screw tightening hole in the conversion part 64, a nut or the like may be attached to the conversion part 64.

  According to the present embodiment, when the contact member 120 is pressed against the conversion unit 64 side by the pressing member 122, the scintillator 62 is held between the conversion unit 64 and the contact member 120, so the conversion unit 64, the scintillator 62, and The contact member 120 is integrated. Thereby, the strength (rigidity) of the radiation detector 118 can be improved as compared with the case where the scintillator 62 is bonded to the conversion unit 64 by an adhesive member or the like. Further, when the pressing of the contact member 120 is released, the scintillator 62 and the conversion unit 64 are separated. Thereby, when one of the scintillator 62 and the conversion unit 64 fails, the other can be reused. Further, since the scintillator 62 is not bonded to the conversion unit 64 using an adhesive member or the like, the scintillator 62 is not damaged when the scintillator 62 is removed from the conversion unit 64.

  The present invention is not limited to the first to fourth embodiments described above, and can be implemented in various forms. For example, an adhesive may be used as the adhesive member. In this case, as the adhesive, an adhesive whose adhesive force changes when an external factor acts is used. The external factors include, for example, physical things such as light and heat, and chemical things such as drugs. As such an adhesive, for example, a dismantling adhesive such as a thermoplastic adhesive, an electrically heated plastic adhesive, an ultraviolet plastic adhesive, or a water-absorbing plastic adhesive can be used.

  As a result, the adhesive force of the adhesive member can be changed. For example, when the radiation detector is peeled from the transmission surface portion, the adhesive force of the adhesive member is reduced, or when the radiation detector is bonded to the transmission surface portion. The adhesive force of the adhesive member can be increased. Therefore, it is possible to eliminate the concern that the radiation detector is damaged at the time of peeling from the transmission surface portion of the radiation detector, or that the radiation detector bonded to the transmission surface portion is peeled off without intention. The adhesive member may be a combination of the adhesive and a double-sided tape.

  Moreover, this invention is not limited to the example which adhere | attaches a conversion part on the inner surface of a permeation | transmission surface part with an adhesive member. For example, the position of the scintillator and the conversion unit of the radiation detector described above may be interchanged, and the scintillator may be bonded to the inner surface of the transmission surface portion with an adhesive member.

  Furthermore, this invention is not restricted to the form which adhere | attaches a radiation detector on the inner surface of a permeation | transmission surface part. For example, in the present invention, an intermediate member may be disposed between the transmission surface portion and the radiation detector, and the radiation detector may be bonded to the intermediate member.

  As shown in FIG. 15, the casing 124 may have the upper member 126 formed in a plate shape and the lower member 128 formed in a U-shaped cross section. In FIG. 15, illustration of components housed in the housing 124 is omitted. In this case, the upper member 126 is made of fiber reinforced resin such as CFRP, and the lower member 128 is made of resin, metal, or the like that is different from the material of the upper member 126.

  The housing of the present invention may be made of various materials. For example, as shown in FIG. 16, the housing 130 may be configured by laminating a plurality of carbon fiber sheets. In this case, the number of laminated carbon fiber sheets can be increased with respect to the place where the load is concentrated, and the carbon fiber sheet can be reinforced compared to the place where the load is not concentrated.

  In addition, as shown in FIG. 17, the housing 132 may be configured such that a plurality of honeycomb structures 134 are sandwiched between cover members 136. In this case, the cover member 136 is formed of CFRP, and the honeycomb structure 134 is formed of, for example, an aramid material or a foam material. As the foam material, polystyrene foam, acrylic foam, polyvinyl chloride foam, foamed silicone, polyurethane foam and the like are used. However, when foamed polypropylene, which is an acrylic foam, is used as the foamed material, the cost can be kept lower than when other foamed materials are used.

  The radiographic image capturing apparatus according to the present invention may be used as a radiographic image capturing apparatus fixed at a predetermined position.

DESCRIPTION OF SYMBOLS 10 ... Radiation imaging system 12 ... Subject 16 ... Radiation 20 ... Radiation imaging device 28 ... Cassette main body 32 ... Case 34 ... Upper member 36 ... Lower member 37 ... Transmission surface 38 ... Transmission surface part (1st member)
40 ... Upper side surface portion (second member) 42 ... Back surface portion 44 ... Lower side surface portion 50, 118 ... Radiation detector 62 ... Scintillator 64 ... Conversion portion 86 ... Adhesive member 88 ... Communication passage 90 ... Corner portions 114, 116 ... Filter member 120 ... Contact member 122 ... Pressing member

Claims (9)

A support member having a transmission surface through which radiation transmitted through the subject is transmitted;
A radiation detector for detecting radiation transmitted through the transmission surface;
An adhesive member for releasably bonding the radiation detector to the support member so that an internal space is formed between the radiation detector and the transmission surface;
A radiographic imaging apparatus comprising: a ventilation means that communicates the internal space with the outside and prevents foreign matter from entering the internal space from the outside. The radiographic imaging apparatus according to claim 1,
As the ventilation means, there is provided a communication path formed in the adhesive member to communicate the internal space and the outside,
The radiographic imaging apparatus characterized in that the communication path is bent. The radiographic imaging apparatus according to claim 1,
As the ventilation means, a communication path formed in the adhesive member that communicates the internal space and the outside, and allows air flow between the communication path and the outside, and foreign substances from the outside to the communication path. A radiographic imaging apparatus, comprising: a filter member that prevents mixing. In the radiographic imaging device of any one of Claims 1-3,
The radiation detector is a scintillator that converts radiation transmitted through the subject into visible light;
A conversion unit that is provided in the scintillator and converts visible light converted by the scintillator into an electrical signal;
The radiographic imaging apparatus, wherein the conversion unit is bonded to the support member by the adhesive member. In the radiographic imaging device according to claim 4,
The radiation detector is located on the opposite side of the conversion unit across the scintillator, and a contact member that contacts the scintillator;
A radiographic imaging apparatus, further comprising: pressing means capable of pressing the contact member against the conversion unit side. In the radiographic imaging device of any one of Claims 1-5,
The radiation image capturing apparatus according to claim 1, wherein the support member is a housing that houses the radiation detector. The radiographic imaging device according to claim 6,
The radiographic imaging apparatus characterized in that the casing is made of a material containing a reinforcing fiber resin. The radiographic imaging device according to claim 7,
The housing includes a plate-like first member facing the radiation detector, and a second member erected on the periphery of the first member so as to be integrated with the first member. A radiographic imaging device as a feature. In the radiographic imaging device of any one of Claims 1-8,
The radiographic apparatus according to claim 1, wherein the adhesive member is made of a material whose adhesive force changes when an external factor acts.

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