JP5634883B2 - Electronic cassette for radiography - Google Patents
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- JP5634883B2 JP5634883B2 JP2011000603A JP2011000603A JP5634883B2 JP 5634883 B2 JP5634883 B2 JP 5634883B2 JP 2011000603 A JP2011000603 A JP 2011000603A JP 2011000603 A JP2011000603 A JP 2011000603A JP 5634883 B2 JP5634883 B2 JP 5634883B2
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- Radiography Using Non-Light Waves (AREA)
- Apparatus For Radiation Diagnosis (AREA)
- Measurement Of Radiation (AREA)
Description
本発明は、可搬型の筐体を持つ放射線撮影用電子カセッテに関するものである。 The present invention relates to an electronic cassette for radiography having a portable housing.
医療分野において、画像診断を行うために、放射線、例えばＸ線を利用して被写体を撮影するＸ線撮影システムが知られている。Ｘ線撮影システムは、Ｘ線源によって照射され被写体を透過したＸ線の照射を受けて、被写体の放射線画像を検出するＸ線画像検出装置を有する。Ｘ線画像検出装置としては、Ｘ線の入射量に応じた信号電荷を蓄積する画素がマトリクスに配列された検出面を有し、検出面において画素毎に信号電荷を蓄積することで、被写体の画像情報を表すＸ線画像を検出し、これをデジタルな画像データとして出力するＸ線画像検出器（ＦＰＤ：flat panel detector）を利用したものが実用化されている。 In the medical field, an X-ray imaging system for imaging a subject using radiation, for example, X-rays, is known in order to perform image diagnosis. The X-ray imaging system includes an X-ray image detection device that receives an X-ray irradiated by an X-ray source and transmitted through the subject and detects a radiographic image of the subject. The X-ray image detection apparatus has a detection surface in which pixels that accumulate signal charges according to the amount of incident X-rays are arranged in a matrix, and accumulates signal charges for each pixel on the detection surface, thereby An apparatus using an X-ray image detector (FPD: flat panel detector) that detects an X-ray image representing image information and outputs it as digital image data has been put into practical use.
また、Ｘ線画像検出装置には、立位姿勢や臥位姿勢の被検者を撮影するための立位撮影台や臥位撮影台にＦＰＤが内蔵された据え置き型の他、偏平な形状の可搬型の筐体にＦＰＤを内蔵した可搬型Ｘ線画像検出装置（以下「電子カセッテ」という）も開発されている。電子カセッテは、フイルムやＩＰ（イメージングプレート）を使用したフイルムカセッテやＩＰカセッテなどの他のＸ線撮影用カセッテと同様に、撮影室までの移動が困難な被検者の撮影のために病室に持ち込まれたり、据え置き型では撮影しにくい部位（例えば、肘や膝の関節などの四肢）の撮影に用いられる。 In addition, the X-ray image detection apparatus has a flat shape in addition to a stationary type in which an FPD is built in a standing position photographing stand or a standing position photographing stand for photographing a subject in a standing posture or a standing posture. A portable X-ray image detection apparatus (hereinafter referred to as “electronic cassette”) in which an FPD is built in a portable casing has also been developed. The electronic cassette, like other film cassettes using film or IP (imaging plate) and IP cassettes, is used in patient rooms for imaging patients who are difficult to move to the imaging room. It is used for photographing a part that is difficult to photograph when it is brought in or stationary (for example, extremities such as elbows and knee joints).
Ｘ線撮影用カセッテの筐体には、第１に、可搬型であるため軽量であること、第２に、筐体の前面部はＸ線を透過して筐体内部にＸ線を入射させる入射面となるためＸ線透過性が高いこと、第３に、電子カセッテを撮影台から取り外して寝台やテーブル上で使用する場合には、筐体の入射面には被検者の撮影部位が載置されて荷重がかかるため、入射面は撮影部位から加わる荷重に耐えられるような剛性を持つことなどの基本性能が求められる。 The housing of the X-ray imaging cassette is firstly portable and lightweight, and secondly, the front portion of the housing transmits X-rays and makes X-rays enter the housing. X-ray transmission is high because it is an entrance surface. Third, when the electronic cassette is removed from the imaging table and used on a bed or table, the imaging site of the subject is located on the entrance surface of the housing. Since it is placed and a load is applied, the entrance surface is required to have basic performance such as rigidity enough to withstand the load applied from the imaging region.
特許文献１及び２には、カセッテの筐体に用いられる透過板に、軽量で剛性が高く、かつ、Ｘ線透過性が良好なカーボン材料を用いる透過板が開示されている。特許文献１には、ＣＦＲＰ（炭素繊維強化樹脂）と、芳香族ポリアミド繊維で強化した樹脂（ＡＦＲＰ）を用い、一方を中間層にして他方を両側から挟み込むように積層したサンドイッチ構造の透過板が記載されており、剛性を確保しつつ、ＣＦＲＰをＡＦＲＰで覆うことで透過板の表面のヒビ割れを防止している。特許文献２には、樹脂製の芯材を中間層にしてＣＦＲＰを両側から挟み込むように積層したサンドイッチ構造の透過板が記載されており、樹脂製の芯材をＣＦＲＰで挟むことで、剛性を確保しつつ、Ｘ線透過性をより向上させている。 Patent Documents 1 and 2 disclose a transmission plate that uses a carbon material that is lightweight, has high rigidity, and has good X-ray transmission as a transmission plate used in a casing of a cassette. Patent Document 1 discloses a sandwich-structured transmission plate using CFRP (carbon fiber reinforced resin) and a resin reinforced with aromatic polyamide fibers (AFRP) and laminated so that one is an intermediate layer and the other is sandwiched from both sides. As described above, cracking of the surface of the transmission plate is prevented by covering CFRP with AFRP while securing rigidity. Patent Document 2 describes a transmission plate having a sandwich structure in which a CFRP core is sandwiched between both sides with a resin core material as an intermediate layer. By sandwiching a resin core material between CFRP, rigidity is improved. X-ray transparency is further improved while ensuring.
ところで、ＦＰＤを構成する検出パネルは、フイルムやＩＰ以上に、温度変化に対して敏感な特性を有しているため、筐体外から透過板を通じて検出パネルが収容される筐体内に伝わる熱は少ない方がよい。特許文献１及び特許文献２には、こうした課題及びその解決策について開示がない。 By the way, since the detection panel which comprises FPD has the characteristic more sensitive to a temperature change than film or IP, there is little heat transmitted from the exterior to the housing | casing in which a detection panel is accommodated through a permeation | transmission board. Better. Patent Document 1 and Patent Document 2 do not disclose such problems and solutions.
本発明は、上記事情に鑑みてなされたもので、筐体外から透過板を通じて筐体内に熱が伝わりにくい電子カセッテを提供することを目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electronic cassette in which heat is not easily transmitted from the outside of the casing to the inside of the casing through the transmission plate.
本発明は、被写体を透過した放射線の照射を受けて、被写体の放射線画像を検出する放射線画像検出器と、放射線画像検出器を収容する筐体と、筐体において、放射線を透過して放射線画像検出器に入射させるための入射面を構成する透過板であり、筐体の外表面を構成する最外層となる第１層が、熱伝導率が１５０Ｗ／ｍＫ以上のＰＩＴＣＨ系炭素繊維で形成されたＰＩＴＣＨ系カーボン材料で構成された透過板とを備え、透過板は、第１層よりも内部側に位置する第２層がＰＡＮ系炭素繊維で形成されたＰＡＮ系カーボン材料で構成されているものである。
The present invention receives the radiation transmitted through the object, a radiation image detector for detecting a radiation image of an object, a housing to house the radiological image detector, in the housing, transmitted through the radiological Radiation is transparent plate constituting the incident surface for incident on the image detector, the first layer of the outermost layer constituting the outer surface of the housing, the thermal conductivity of more than 150 W / mK PITCH-based carbon fibers The transmission plate is made of a PAN-based carbon material in which the second layer located on the inner side of the first layer is formed of PAN-based carbon fiber. It is what has been .
透過板は、第２層よりも内部側に位置する第３層がＰＩＴＣＨ系カーボン材料で構成されており、第２層が両側からＰＩＴＣＨ系カーボン材料で挟まれたサンドイッチ構造であることが好ましい。
Toru Kaita, rather than the second layer and the third layer located on the inner side is constituted by a P ITCH based carbon material, the second layer is a sandwich structure sandwiched on both sides or al P ITCH based carbon material It is preferable.
本発明によれば、筐体の外表面を構成する最外層となる第１層が少なくとも熱伝導率が１５０Ｗ／ｍＫ以上のＰＩＴＣＨ系炭素繊維で形成されたＰＩＴＣＨ系カーボン材料で構成された透過板を有するから、筐体外から透過板を通じて筐体内に熱が伝わりにくい放射線撮影用電子カセッテを提供することができる。 According to the present invention, the first layer, which is the outermost layer constituting the outer surface of the housing, is made of a PITCH-based carbon material formed of PITCH-based carbon fibers having at least a thermal conductivity of 150 W / mK or more. Therefore, it is possible to provide a radiographic electronic cassette in which heat is not easily transmitted from the outside of the housing to the inside of the housing through the transmission plate.
図１において、Ｘ線撮影システム１０は、Ｘ線発生装置１１と、Ｘ線撮影装置１２とからなる。Ｘ線発生装置１１は、Ｘ線源１３と、Ｘ線源１３を制御する線源制御装置１４と、照射スイッチ１５とを有する。Ｘ線源１３は、Ｘ線を放射するＸ線管１３ａとＸ線管が放射するＸ線の照射野を限定する照射野限定器（コリメータ）１３ｂとを有している。 In FIG. 1, the X-ray imaging system 10 includes an X-ray generation device 11 and an X-ray imaging device 12. The X-ray generator 11 includes an X-ray source 13, a radiation source controller 14 that controls the X-ray source 13, and an irradiation switch 15. The X-ray source 13 includes an X-ray tube 13a that emits X-rays and an irradiation field limiter (collimator) 13b that limits the irradiation field of the X-rays emitted by the X-ray tube.
Ｘ線管１３ａは、熱電子を放出するフィラメントからなる陰極と、陰極から放出された熱電子が衝突してＸ線を放射する陽極（ターゲット）とを有している。照射野限定器１３ｂは、例えば、Ｘ線を遮蔽する複数枚の鉛板を井桁状に配置し、Ｘ線を透過させる照射開口が中央に形成されたものであり、鉛板の位置を移動することで照射開口の大きさを変化させて、照射野を限定する。 The X-ray tube 13a has a cathode made of a filament that emits thermoelectrons, and an anode (target) that emits X-rays when the thermoelectrons emitted from the cathode collide. The irradiation field limiter 13b has, for example, a plurality of lead plates that shield X-rays arranged in a cross pattern, and an irradiation opening that transmits X-rays is formed in the center, and moves the position of the lead plate. By changing the size of the irradiation aperture, the irradiation field is limited.
線源制御装置１４は、Ｘ線源１３に対して高電圧を供給する高電圧発生器と、Ｘ線源１３が照射するＸ線のエネルギースペクトルを決める管電圧、単位時間当たりの照射量を決める管電流、及びＸ線の照射が継続する照射時間を制御する制御部とからなる。高電圧発生器は、トランスによって入力電圧を昇圧して高圧の管電圧を発生し、高電圧ケーブルを通じてＸ線源１３に駆動電力を供給する。管電圧、管電流、照射時間といった撮影条件は、線源制御装置１４の操作パネルから技師によって手動により設定される他、Ｘ線撮影装置１２から通信ケーブルを介して設定される。 The radiation source control device 14 determines a high voltage generator that supplies a high voltage to the X-ray source 13, a tube voltage that determines the energy spectrum of the X-rays that the X-ray source 13 irradiates, and an irradiation amount per unit time. It consists of a controller that controls the tube current and the irradiation time during which X-ray irradiation continues. The high voltage generator boosts the input voltage with a transformer to generate a high voltage tube voltage, and supplies driving power to the X-ray source 13 through a high voltage cable. The imaging conditions such as the tube voltage, the tube current, and the irradiation time are set manually by an engineer from the operation panel of the radiation source control device 14 and are set from the X-ray imaging device 12 via a communication cable.
照射スイッチ１５は、線源制御装置１４に操作信号を入力する入力部である。照射スイッチ１５は二段スイッチになっており、一段目を押下するとＸ線源１３のウォームアップを開始させるためのウォームアップ開始信号が入力され、二段目を押下するとＸ線源１３に照射を開始させるための照射開始信号が入力される。 The irradiation switch 15 is an input unit that inputs an operation signal to the radiation source control device 14. The irradiation switch 15 is a two-stage switch. When the first stage is pressed, a warm-up start signal for starting warm-up of the X-ray source 13 is input, and when the second stage is pressed, the X-ray source 13 is irradiated. An irradiation start signal for starting is input.
Ｘ線撮影装置１２は、電子カセッテ２１、撮影台２２、撮影制御装置２３、コンソール２４を有する。電子カセッテ２１は、ＦＰＤ３１（図３参照）と、ＦＰＤ３１を収容する可搬型の筐体２６（図２参照）とからなり、Ｘ線源１３から照射され被検者（被写体）Ｈを透過したＸ線の照射を受けてＸ線画像を検出するＸ線画像検出装置である。電子カセッテ２１の筐体２６は、偏平な箱形をしている。筐体２６は、半切サイズ（３８３．５ｍｍ×４５９．５ｍｍ）のフイルム用またはＩＰ用のカセッテと同様の国際規格ＩＳＯ４０９０：２００１に準拠した外形サイズを有しており、Ｘ線の入射面２６ａ（図２参照）となる前面と反対側の背面の平面形状は、長方形である。 The X-ray imaging apparatus 12 includes an electronic cassette 21, an imaging table 22, an imaging control apparatus 23, and a console 24. The electronic cassette 21 includes an FPD 31 (see FIG. 3) and a portable housing 26 (see FIG. 2) that accommodates the FPD 31, and is irradiated from the X-ray source 13 and passes through a subject (subject) H. An X-ray image detection apparatus that detects an X-ray image by receiving an irradiation of a line. The casing 26 of the electronic cassette 21 has a flat box shape. The casing 26 has an outer size conforming to the international standard ISO 4090: 2001 similar to a cassette for film or IP of a half-cut size (383.5 mm × 459.5 mm), and has an X-ray incident surface 26a ( The planar shape of the back surface on the opposite side to the front surface (see FIG. 2) is a rectangle.
撮影台２２は、電子カセッテ２１が着脱自在に取り付けられるスロットを有し、Ｘ線が入射する入射面がＸ線源１３と対向する姿勢で電子カセッテ２１を保持する。電子カセッテ２１は、筐体２６のサイズがフイルムカセッテやＩＰカセッテとほぼ同様の大きさであるため、フイルムカセッテやＩＰカセッテ用の撮影台にも取り付け可能である。撮影台２２として、被検者Ｈを立位姿勢で撮影する立位撮影台を例示しているが、もちろん、被検者Ｈを臥位姿勢で撮影する臥位撮影台でもよい。 The imaging table 22 has a slot in which the electronic cassette 21 is detachably attached, and holds the electronic cassette 21 with an incident surface on which X-rays are incident facing the X-ray source 13. The electronic cassette 21 can be attached to a film cassette or an IP cassette photographing stand because the size of the casing 26 is almost the same as that of the film cassette or the IP cassette. As the imaging table 22, a standing imaging table for imaging the subject H in a standing posture is illustrated, but of course, a standing imaging table for imaging the subject H in a lying posture may be used.
撮影制御装置２３は、有線方式や無線方式により電子カセッテ２１と通信可能に接続されており、電子カセッテ２１を制御する。具体的には、電子カセッテ２１に対して撮影条件を送信して、ＦＰＤ３１の信号処理の処理条件（信号電荷に応じた電圧を増幅する積分アンプのゲインなど）を設定させるとともに、Ｘ線源１３の照射タイミングとＦＰＤ３１の蓄積動作を同期させるための同期信号をＸ線発生装置１１から受信して、これを電子カセッテ２１に送信することにより、Ｘ線源１３とＦＰＤ３１の同期制御を行う。また、撮影制御装置２３は、電子カセッテ２１が出力する画像データを受信して、コンソール２４に送信する。 The imaging control device 23 is connected to the electronic cassette 21 so as to be communicable by a wired method or a wireless method, and controls the electronic cassette 21. Specifically, the imaging conditions are transmitted to the electronic cassette 21 to set the processing conditions of the signal processing of the FPD 31 (such as the gain of an integrating amplifier that amplifies the voltage corresponding to the signal charge), and the X-ray source 13 The X-ray source 13 and the FPD 31 are synchronously controlled by receiving a synchronization signal for synchronizing the irradiation timing of the FPD 31 and the accumulation operation of the FPD 31 from the X-ray generator 11 and transmitting it to the electronic cassette 21. Further, the imaging control device 23 receives the image data output from the electronic cassette 21 and transmits it to the console 24.
コンソール２４は、患者の性別、年齢、撮影部位、撮影目的といった情報が含まれる検査オーダの入力を受け付けて、検査オーダをモニタに表示する。検査オーダは、ＨＩＳ（病院情報システム）やＲＩＳ（放射線情報システム）といった患者情報や放射線検査に係る検査情報を管理する外部システムから入力される。あるいは、技師などのオペレータの手動により入力される。オペレータは、検査オーダの内容をモニタで確認し、その内容に応じた撮影条件をコンソール２４の操作画面を通じて選択する。選択された撮影条件は、撮影制御装置２３へ送信される。 The console 24 receives an input of an examination order including information such as a patient's sex, age, imaging region, and imaging purpose, and displays the examination order on a monitor. The examination order is input from an external system that manages patient information such as HIS (Hospital Information System) and RIS (Radiation Information System) and examination information related to radiation examination. Alternatively, it is manually input by an operator such as an engineer. The operator confirms the contents of the inspection order on the monitor, and selects an imaging condition corresponding to the contents through the operation screen of the console 24. The selected shooting condition is transmitted to the shooting control device 23.
また、コンソール２４は、撮影制御装置２３から送信されるＸ線画像のデータに対して画像処理を施す。処理済みのＸ線画像は、コンソール２４のモニタに表示される他、Ｘ線画像のデータは、コンソール２４内のハードディスクやメモリや、コンソール２４とネットワークで接続された画像蓄積サーバといったデータストレージデバイスに格納される。 The console 24 performs image processing on the X-ray image data transmitted from the imaging control device 23. The processed X-ray image is displayed on the monitor of the console 24, and the X-ray image data is stored in a data storage device such as a hard disk or memory in the console 24 or an image storage server connected to the console 24 via a network. Stored.
図２に示すように、被検者Ｈの手や足など、電子カセッテ２１を撮影台２２に取り付けた状態で撮影しにくい撮影部位に対しては、電子カセッテ２１は、撮影台２２から取り外されて使用される。被検者Ｈの手が撮影部位である場合には、電子カセッテ２１は、例えば、筐体２６の外表面の一面である、Ｘ線が入射する入射面２６ａを上向きにして寝台やテーブル上に置かれる。被検者Ｈの手は入射面２６ａのほぼ中央に載置されて撮影が行われる。入射面２６ａのうち外縁を除くほとんどの部分は、Ｘ線を透過する透過板２７で構成されており、電子カセッテ２１を撮影台２２から取り外して使用する場合は、透過板２７と被検者Ｈの撮影部位とを直接接触させて撮影が行われる。 As shown in FIG. 2, the electronic cassette 21 is removed from the imaging table 22 for imaging sites that are difficult to image with the electronic cassette 21 attached to the imaging table 22, such as the hand and foot of the subject H. Used. When the hand of the subject H is an imaging region, the electronic cassette 21 is placed on a bed or a table with the incident surface 26a on which an X-ray is incident, which is one surface of the outer surface of the housing 26, facing upward, for example. Placed. The hand of the subject H is placed on the approximate center of the incident surface 26a and photographing is performed. Most part of the entrance surface 26a except the outer edge is composed of a transmission plate 27 that transmits X-rays. When the electronic cassette 21 is removed from the imaging table 22, the transmission plate 27 and the subject H are used. Imaging is performed by directly contacting the imaging part.
図３において、ＦＰＤ３１は、Ｘ線の入射量に応じた信号電荷を蓄積する複数の画素３７が配列された画素アレイからなる検出面３８を有する検出パネル３５と、画素３７を駆動して信号電荷の読み出しを制御するゲートドライバ３９と、画素３７から読み出された信号電荷をデジタルデータに変換して出力する信号処理回路４０と、ゲートドライバ３９と信号処理回路４０を制御して、ＦＰＤ３１の動作を制御する制御回路４１とを備えている。複数の画素３７は、所定のピッチで二次元にＧ１〜Ｇｎ行（ｘ方向）×Ｄ１〜Ｄｍ列（ｙ方向）のマトリクスに配列されている。 In FIG. 3, an FPD 31 drives a detection panel 35 having a detection surface 38 composed of a pixel array in which a plurality of pixels 37 for accumulating signal charges according to the amount of incident X-rays are arranged, and drives the pixels 37 to generate signal charges. Operation of the FPD 31 by controlling the gate driver 39 for controlling the reading of the signal, the signal processing circuit 40 for converting the signal charge read from the pixel 37 into digital data and outputting it, and the gate driver 39 and the signal processing circuit 40. And a control circuit 41 for controlling. The plurality of pixels 37 are two-dimensionally arranged in a matrix of G1 to Gn rows (x direction) × D1 to Dm columns (y direction) at a predetermined pitch.
ＦＰＤ３１は、Ｘ線を可視光に変換し可視光を光電変換して信号電荷を蓄積する間接変換型である。検出パネル３５は、画素３７によって可視光を光電変換する光電変換パネルであり、検出面３８上には、その全面と対面するように、Ｘ線を可視光に変換するシンチレータ６１（図４及び５参照）が配置される。シンチレータ６１は、ＣｓＩ（ヨウ化セシウム）やＧＯＳ（ガドリウムオキシサルファイド）などの蛍光体からなる。シンチレータ６１は、支持体上に蛍光体が塗布されたシートを接着剤で接着したり、検出面３８上に蛍光体を蒸着するなどの方法により形成される。 The FPD 31 is an indirect conversion type that converts X-rays into visible light, photoelectrically converts visible light, and accumulates signal charges. The detection panel 35 is a photoelectric conversion panel that photoelectrically converts visible light by the pixels 37, and a scintillator 61 that converts X-rays into visible light on the detection surface 38 so as to face the entire surface (see FIGS. 4 and 5). Reference) is arranged. The scintillator 61 is made of a phosphor such as CsI (cesium iodide) or GOS (gadolinium oxysulfide). The scintillator 61 is formed by a method of adhering a sheet coated with a phosphor on a support with an adhesive, or depositing a phosphor on the detection surface 38.
画素３７は、可視光の入射によって電荷（電子−正孔対）を発生する光電変換素子であるフォトダイオード４２及びフォトダイオード４２が発生した電荷を蓄積するキャパシタからなり、スイッチング素子として薄膜トランジスタ（ＴＦＴ）４３を備える。検出パネル３５は、ガラス基板７１（図５参照）などの絶縁基板上に画素３７が形成されたＴＦＴアクティブマトリクス基板である。 The pixel 37 includes a photodiode 42 that is a photoelectric conversion element that generates charges (electron-hole pairs) upon incidence of visible light, and a capacitor that accumulates the charges generated by the photodiode 42, and a thin film transistor (TFT) as a switching element. 43. The detection panel 35 is a TFT active matrix substrate in which pixels 37 are formed on an insulating substrate such as a glass substrate 71 (see FIG. 5).
フォトダイオード４２は、ａ−Ｓｉ（アモルファスシリコン）などの半導体層（例えばＰＩＮ型）とその上下に上部電極及び下部電極を配した構造を有している。フォトダイオード４２は、下部電極にＴＦＴ４３が接続され、上部電極には、バイアス線４７が接続されており、バイアス電源４８からバイアス電圧が印加される。バイアス電圧の印加により半導体層内に電界が生じるため、光電変換により半導体層内で発生した電荷（電子−正孔対）は、一方がプラス、他方がマイナスの極性を持つ上部電極と下部電極に移動し、キャパシタに電荷が蓄積される。 The photodiode 42 has a structure in which a semiconductor layer (for example, PIN type) such as a-Si (amorphous silicon) and an upper electrode and a lower electrode are arranged above and below the semiconductor layer. In the photodiode 42, the TFT 43 is connected to the lower electrode, the bias line 47 is connected to the upper electrode, and a bias voltage is applied from the bias power supply 48. Since an electric field is generated in the semiconductor layer by applying a bias voltage, charges (electron-hole pairs) generated in the semiconductor layer by photoelectric conversion are applied to the upper and lower electrodes, one having a positive polarity and the other having a negative polarity. The electric charge is accumulated in the capacitor.
ＴＦＴ４３は、ゲート電極が走査線４４に接続され、ソース電極が信号線４６に接続され、ドレイン電極がフォトダイオード４２に接続される。走査線４４と信号線４６は格子状に配線されており、走査線４４は、検出面３８内の画素３７の行数分（ｎ行分）、信号線４６は画素３７の列数分（ｍ列分）それぞれ配線されている。走査線４４はゲートドライバ３９に接続され、信号線４６は読み出し回路４９に接続される。 The TFT 43 has a gate electrode connected to the scanning line 44, a source electrode connected to the signal line 46, and a drain electrode connected to the photodiode 42. The scanning lines 44 and the signal lines 46 are wired in a lattice pattern. The scanning lines 44 are the number of rows of the pixels 37 in the detection surface 38 (n rows), and the signal lines 46 are the number of columns of the pixels 37 (m. Each column is wired. The scanning line 44 is connected to the gate driver 39, and the signal line 46 is connected to the readout circuit 49.
読み出し回路４９は、検出パネル３５から読み出した信号電荷を電圧信号に変換する積分アンプと、検出面３８内の画素３７の列を順次切り替えて１列ずつ電圧信号を順次出力するためのマルチプレクサとからなる。読み出し回路４９で読み出された電圧信号は、Ａ／Ｄ変換回路５１でデジタルデータに変換されて、メモリ５２にデジタルな画像データとして書き込まれる。 The readout circuit 49 includes an integration amplifier that converts the signal charge read from the detection panel 35 into a voltage signal, and a multiplexer that sequentially switches the columns of the pixels 37 in the detection surface 38 and sequentially outputs the voltage signals column by column. Become. The voltage signal read by the reading circuit 49 is converted into digital data by the A / D conversion circuit 51 and written as digital image data in the memory 52.
図４及び図５に示すように、筐体２６は、入射面２６ａを構成し、検出パネル３５とシンチレータ６１からなるパネルユニット６２を前面から覆う前面部５６と、背面から覆う背面部５７とからなる。前面部５６は、透過板２７と、透過板２７が取り付けられる開口が形成された枠体５６ａからなる。透過板２７は、軽量で剛性が高く、かつＸ線透過性が高いカーボン材料で形成されている。枠体５６ａは例えば樹脂製である。背面部５７は、ステンレスなどの金属で形成される。パネルユニット６２の背面側には、ベース板６３、回路基板６６〜６９が順に配置される。 As shown in FIGS. 4 and 5, the housing 26 forms an incident surface 26 a, and includes a front surface portion 56 that covers the panel unit 62 including the detection panel 35 and the scintillator 61 from the front surface, and a back surface portion 57 that covers the back surface. Become. The front surface portion 56 includes a transmission plate 27 and a frame body 56a in which an opening to which the transmission plate 27 is attached is formed. The transmission plate 27 is made of a carbon material that is lightweight, has high rigidity, and has high X-ray permeability. The frame body 56a is made of, for example, a resin. The back surface portion 57 is formed of a metal such as stainless steel. On the back side of the panel unit 62, a base plate 63 and circuit boards 66 to 69 are arranged in this order.
パネルユニット６２は、筐体２６の入射面２６ａ側から、シンチレータ６１、検出パネル３５の順に位置する向きで配置される。ベース板６３には、回路基板６６〜６９が取り付けられる。ベース板６３は、例えば、ステンレス製である。 The panel unit 62 is arranged in an orientation in which the scintillator 61 and the detection panel 35 are positioned in this order from the incident surface 26 a side of the housing 26. Circuit boards 66 to 69 are attached to the base plate 63. The base plate 63 is made of stainless steel, for example.
回路基板６６は、検出パネル３５のＴＦＴを駆動するゲートドライバ３９を構成する回路素子が形成された回路基板である。回路基板６７は、Ａ／Ｄ変換回路５１を構成する回路素子が形成された回路基板である。回路基板６８は、制御回路４１を構成する回路素子が形成された回路基板である。回路基板６９は、電源回路（ＡＣ−ＤＣコンバータやＤＣ−ＤＣコンバータなど）を構成する回路素子が形成された回路基板である。 The circuit board 66 is a circuit board on which circuit elements constituting the gate driver 39 that drives the TFT of the detection panel 35 are formed. The circuit board 67 is a circuit board on which circuit elements constituting the A / D conversion circuit 51 are formed. The circuit board 68 is a circuit board on which circuit elements constituting the control circuit 41 are formed. The circuit board 69 is a circuit board on which circuit elements constituting a power circuit (AC-DC converter, DC-DC converter, etc.) are formed.
回路基板６６と回路基板６７は、それぞれフレキシブルケーブル７６、７７によって、検出パネル３５と接続される。フレキシブルケーブル７６、７７には、ＴＣＰ（テープキャリアパッケージ）型のＩＣチップ７８、７９がそれぞれ実装されている。ＩＣチップ７８は、ゲートパルスを画素３７の行単位で順にシフトさせるためのシフトレジスタなどからなり、回路基板６６に形成された回路素子とともにゲートドライバ３９を構成する。ＩＣチップ７９は、読み出し回路４９を構成するＡＳＩＣである。 The circuit board 66 and the circuit board 67 are connected to the detection panel 35 by flexible cables 76 and 77, respectively. TCP (tape carrier package) type IC chips 78 and 79 are mounted on the flexible cables 76 and 77, respectively. The IC chip 78 includes a shift register for sequentially shifting the gate pulse in units of rows of the pixels 37, and constitutes the gate driver 39 together with the circuit elements formed on the circuit board 66. The IC chip 79 is an ASIC that constitutes the readout circuit 49.
図２に示すように、電子カセッテ２１は、据え置き型と異なり、被検者Ｈの手などの撮影部位を透過板２７に接触させて撮影することもあるので、被検者Ｈの体温によって、透過板２７の温度が上昇し、その熱が検出パネル３５を収容する筐体２６内に伝わりやすい。フォトダイオード４２の感度や暗電流特性は、温度依存性を持つため、筐体２６外から筐体２６内に熱が伝わるのは好ましくない。 As shown in FIG. 2, unlike the stationary type, the electronic cassette 21 may be photographed by bringing a photographing part such as the hand of the subject H into contact with the transmission plate 27, so that depending on the body temperature of the subject H, The temperature of the transmission plate 27 rises and the heat is easily transferred into the housing 26 that houses the detection panel 35. Since the sensitivity and dark current characteristics of the photodiode 42 have temperature dependence, it is not preferable that heat is transferred from the outside of the housing 26 to the inside of the housing 26.
透過板２７は、カーボン材料を用いることで、軽量で剛性が高く、かつＸ線透過性が高いという透過板の基本性能を満足することに加えて、次に示すように、透過板２７の熱が筐体２６内に伝わりにくい構造をしている。 In addition to satisfying the basic performance of the transmission plate, which is lightweight, high in rigidity, and high in X-ray transmission, the transmission plate 27 uses a carbon material. Is difficult to be transmitted to the inside of the housing 26.
図６に示すように、透過板２７は、各層がカーボンシートで構成される第１層８１から第３層８３の積層構造をしている。筐体２６の外表面を構成する最外層となる第１層８１と、最内層となる第３層８３は、ＰＩＴＣＨ系の炭素繊維で形成されるＰＩＴＣＨ系カーボン材料で形成されたＰＩＴＣＨ系カーボンシートが使用され、中間層となる第２層８２は、ＰＡＮ系の炭素繊維で形成されるＰＡＮ系カーボン材料で形成されたＰＡＮ系カーボンシートが使用される。透過板２７は、ＰＡＮ系カーボンシートの上下をＰＩＴＣＨ系カーボンシートで挟み込むサンドイッチ構造をしている。第１層８１、第２層８２、第３層８３のカーボンシートは、加熱加圧法（オートクレーブ成形法）や、融着や接着などの貼り合わせ法により、積層して一体化することにより形成される。 As shown in FIG. 6, the transmission plate 27 has a laminated structure of a first layer 81 to a third layer 83 in which each layer is made of a carbon sheet. The first layer 81 that is the outermost layer constituting the outer surface of the casing 26 and the third layer 83 that is the innermost layer are PITCH-based carbon sheets formed of a PITCH-based carbon material formed of PITCH-based carbon fibers. The second layer 82 serving as an intermediate layer is a PAN-based carbon sheet formed of a PAN-based carbon material formed of PAN-based carbon fibers. The transmission plate 27 has a sandwich structure in which the upper and lower sides of the PAN-based carbon sheet are sandwiched between the PITCH-based carbon sheets. The carbon sheets of the first layer 81, the second layer 82, and the third layer 83 are formed by laminating and integrating them by a heat and pressure method (autoclave molding method) or a bonding method such as fusion or adhesion. The
ＰＩＴＣＨ系の炭素繊維は、ＰＩＴＣＨプリカーサ（コールタールまたは石油重質分を原料として得られるピッチ繊維）を炭素化して得られる炭素繊維であり、ＰＡＮ系の炭素繊維は、ＰＡＮプリカーサ（アクリロニトリルを重合したポリアクリロニトリルを製糸化したアクリル繊維）を炭素化して得られる炭素繊維である。ＰＩＴＣＨ系の炭素繊維は、ＰＡＮ系の炭素繊維に比べて、熱伝導率が高いという利点を持ち、一方、ＰＡＮ系の炭素繊維は、ＰＩＴＣＨ系の炭素繊維に比べて、高剛性でコストも安いという利点を持つ。 The PITCH-based carbon fiber is a carbon fiber obtained by carbonizing a PITCH precursor (pitch fiber obtained using coal tar or heavy petroleum as a raw material), and the PAN-based carbon fiber is a polymerized PAN precursor (polymerized acrylonitrile). This is a carbon fiber obtained by carbonizing an acrylic fiber made from polyacrylonitrile. PITCH-based carbon fibers have the advantage of higher thermal conductivity than PAN-based carbon fibers, while PAN-based carbon fibers are more rigid and less expensive than PITCH-based carbon fibers. Has the advantage.
そのため、最外層となる第１層８１に、ＰＡＮ系カーボンシートと比較して、熱伝導率が高いＰＩＴＣＨ系カーボンシートを使用することで、被検者Ｈとの接触部分など透過板２７の一部に熱が加わり、温度が上昇した場合でも、その熱を第１層８１の層内に素早く拡散させることができる。第１層８１は、筐体２６の外表面に位置するため、大気に晒されているので放熱効果も高い。そのため、筐体２６の内部に熱が伝わりにくい。 Therefore, by using a PITCH-based carbon sheet having a higher thermal conductivity than the PAN-based carbon sheet for the first layer 81 that is the outermost layer, a part of the transmission plate 27 such as a contact portion with the subject H can be obtained. Even when heat is applied to the portion and the temperature rises, the heat can be quickly diffused into the first layer 81. Since the 1st layer 81 is located in the outer surface of the housing | casing 26, since it is exposed to air | atmosphere, the heat dissipation effect is also high. Therefore, heat is not easily transmitted to the inside of the housing 26.
第１層８１に使用するＰＩＴＣＨ系カーボンシートは、熱伝導率が１５０Ｗ／ｍＫ以上のものが使用される。被検者Ｈが透過板２７と接触する使用形態を想定して実験を行ったところ、熱伝導率が１５０Ｗ／ｍＫ以上であれば、検出パネル３５の動作に影響が無いという実験結果が得られた。 The PITCH-based carbon sheet used for the first layer 81 has a thermal conductivity of 150 W / mK or more. When the experiment was conducted assuming that the subject H is in contact with the transmission plate 27 and the thermal conductivity is 150 W / mK or more, an experimental result is obtained that the operation of the detection panel 35 is not affected. It was.
さらに、第３層８３に、第１層８１と同じＰＩＴＣＨ系カーボンシートを使用することで、透過板２７の反りを防止することができる。ＰＩＴＣＨ系カーボンシートとＰＡＮ系カーボンシートでは膨張率が異なるため、ＰＡＮ系カーボンシートを両側から膨張率が同じ同種のＰＩＴＣＨ系カーボンシートで挟み込むサンドイッチ構造とすることで、反りが防止される。 Further, by using the same PITCH-based carbon sheet as that of the first layer 81 for the third layer 83, the warp of the transmission plate 27 can be prevented. Since the expansion coefficient differs between the PITCH-based carbon sheet and the PAN-based carbon sheet, warping is prevented by adopting a sandwich structure in which the PAN-based carbon sheet is sandwiched between the same types of PITCH-based carbon sheets having the same expansion coefficient from both sides.
以下に、熱伝導率が１５０Ｗ／ｍＫ以上のＰＩＴＣＨ系カーボンシートを使用した実施例１、２の透過板と、熱伝導率が１５０Ｗ／ｍＫ未満のカーボンシートを使用した比較例の透過板とをそれぞれ所定の条件で評価した実験結果を示す。 Below, the permeation | transmission board of Examples 1 and 2 using the PITCH type | system | group carbon sheet whose heat conductivity is 150 W / mK or more, and the permeation | transmission board of the comparative example using the carbon sheet whose heat conductivity is less than 150 W / mK are shown. The experimental results evaluated under predetermined conditions are shown.
下記表１に示すように、実施例１、２及び比較例の各透過板は、炭素繊維を一方向に引き揃えた炭素繊維シートに母材となるマトリクス樹脂を含浸させた平板状のプリプレグを８枚積層して、これら８枚のプリプレグから、オートクレーブ成形法により１枚の透過板を作製したものである。オートクレーブ成形の成形条件は、２℃／分の昇温速度で室温から１５０℃まで昇温し、１５０℃にて２時間硬化させた後に自然放冷を行った。 As shown in Table 1 below, each of the transmission plates of Examples 1 and 2 and Comparative Example is a flat prepreg in which a carbon fiber sheet in which carbon fibers are aligned in one direction is impregnated with a matrix resin as a base material. Eight sheets are laminated, and one transmission plate is produced from these eight prepregs by an autoclave molding method. The molding conditions of the autoclave molding were as follows: the temperature was raised from room temperature to 150 ° C. at a rate of temperature rise of 2 ° C./min, and the mixture was allowed to cool at 150 ° C. for 2 hours, followed by natural cooling.
１層から８層の各層のプリプレグの炭素繊維の方向は、実施例１、２及び比較例の３つとも共通であり、１層目が０°、２層目が１層目と直交する方向（９０°）、３層目が２層目と同じ９０°、以下、４層目及び５層目が０°、６層目が９０°、７層目が９０°、８層目が０°である。 The direction of the carbon fiber of the prepreg of each layer from the first layer to the eighth layer is common to all of Examples 1, 2 and Comparative Example, and the first layer is 0 °, and the second layer is perpendicular to the first layer. (90 °) The third layer is the same 90 ° as the second layer, the fourth and fifth layers are 0 °, the sixth layer is 90 °, the seventh layer is 90 °, and the eighth layer is 0 °. It is.
表１に示すとおり、実施例１、２の８層のプリプレグの内訳は、ＰＡＮ系炭素繊維を使用したＰＡＮ系プリプレグが４枚、ＰＩＴＣＨ系炭素繊維を使用したＰＩＴＣＨ系プリプレグが４枚であり、実施例１、２は、ＰＡＮ系プリプレグを４枚積層したＰＡＮ系カーボンシートを中間材とし、この中間材の上下に、それぞれＰＩＴＣＨ系プリプレグを２枚積層したカーボンシートを配設したものである。１層目及び２層目の２枚のＰＩＴＣＨ系プリプレグが、第１層８１（図７参照）のＰＩＴＣＨ系カーボンシートを構成し、３層目から６層目の４枚のＰＡＮ系プリプレグが、第２層８２（図７参照）のＰＡＮ系カーボンシートを構成し、７層目及び８層目の２枚のＰＩＴＣＨ系プリプレグが第３層８３（図７参照）のＰＩＴＣＨ系カーボンシートを構成する。 As shown in Table 1, the breakdown of the eight-layer prepregs of Examples 1 and 2 is four PAN-based prepregs using PAN-based carbon fibers and four PITCH-based prepregs using PITCH-based carbon fibers, In Examples 1 and 2, a PAN-based carbon sheet in which four PAN-based prepregs are stacked is used as an intermediate material, and carbon sheets in which two PITCH-based prepregs are stacked are disposed above and below the intermediate material. The two PITCH prepregs of the first layer and the second layer constitute the PITCH carbon sheet of the first layer 81 (see FIG. 7), and the four PAN prepregs from the third layer to the sixth layer, The PAN-based carbon sheet of the second layer 82 (see FIG. 7) is configured, and the two PITCH-based prepregs of the seventh and eighth layers configure the PITCH-based carbon sheet of the third layer 83 (see FIG. 7). .
ＰＡＮ系プリプレグは、実施例１及び実施例２で共通であり、三菱レイヨン製の品番ＴＲ３８０Ｇ１２５（以下ＴＲと略記）を使用している。ＴＲは、ＰＡＮ系炭素繊維として、繊維の密度を表す繊維目付けが１２５ｇ／ｍ2で、熱伝導率が１０Ｗ／ｍＫの三菱レイヨン製の品番ＴＲ５０を使用したものである。 The PAN prepreg is common to Example 1 and Example 2, and uses a product number TR380G125 (hereinafter abbreviated as TR) manufactured by Mitsubishi Rayon. TR is a PAN-based carbon fiber using a product number TR50 manufactured by Mitsubishi Rayon, which has a fiber basis weight indicating the density of the fiber of 125 g / m 2 and a thermal conductivity of 10 W / mK.
ＰＩＴＣＨ系プリプレグは、実施例１及び実施例２で異なり、実施例１のＰＩＴＣＨ系プリプレグは、三菱レイヨン製の品番ＵＲＰ３８０Ｅ１２５（以下ＵＲＰと略記）を使用している。ＵＲＰは、ＰＩＴＣＨ系炭素繊維として、繊維目付けが１２５ｇ／ｍ2で、熱伝導率が１８０Ｗ／ｍＫの日本グラファイトファイバー製の品番ＸＮ６０を使用したものである。実施例２のＰＩＴＣＨ系プリプレグは、三菱レイヨン製の品番ＷＲＰ３８０Ｅ１２５（以下ＷＲＰと略記）を使用している。ＷＲＰは、ＰＩＴＣＨ系炭素繊維として、繊維目付けが１２５ｇ／ｍ2で、熱伝導率が３２０Ｗ／ｍＫの日本グラファイトファイバー製の品番ＸＮ８０を使用したものである。 The PITCH prepreg differs between Example 1 and Example 2. The PITCH prepreg of Example 1 uses a product number URP380E125 (hereinafter abbreviated as URP) manufactured by Mitsubishi Rayon. URP is a PITCH-based carbon fiber using a product number XN60 made of Nippon Graphite Fiber having a fiber basis weight of 125 g / m 2 and a thermal conductivity of 180 W / mK. The PITCH prepreg of Example 2 uses a product number WRP380E125 (hereinafter abbreviated as WRP) manufactured by Mitsubishi Rayon. WRP uses, as a PITCH carbon fiber, a product number XN80 manufactured by Nippon Graphite Fiber having a fiber basis weight of 125 g / m 2 and a thermal conductivity of 320 W / mK.
比較例は、８枚の全プリプレグに、実施例１及び２で使用したＰＡＮ系プリプレグと同様の上記ＴＲを使用したものである。 In the comparative example, the same TR as that of the PAN-based prepreg used in Examples 1 and 2 was used for all eight prepregs.
上記実施例１、２及び比較例の透過板を、以下に示す要領で放熱性の評価を行った。評価方法は、気温が安定した環境下で、評価対象の実施例１、２及び比較例の透過板を宙吊りにし、試験者の手で透過板の裏面を触って１０秒ほど暖め、手を離した直後に透過板の表面の熱分布をサーモグラフィカメラで撮影して熱拡散効果を確認した。図８は、実施例２と比較例のサーモグラフィの測定結果を示し、下記表２は、実施例１、２及び比較例の評価結果をまとめたものである。 The transmission plates of Examples 1 and 2 and the comparative example were evaluated for heat dissipation in the following manner. The evaluation method is to suspend the transmission plates of Examples 1 and 2 and Comparative Example to be suspended in an environment where the temperature is stable, touch the back of the transmission plate with the tester's hand, warm it for about 10 seconds, and release the hand. Immediately after this, the thermal distribution on the surface of the transmission plate was photographed with a thermography camera to confirm the thermal diffusion effect. FIG. 8 shows the thermographic measurement results of Example 2 and Comparative Example, and Table 2 below summarizes the evaluation results of Examples 1 and 2 and Comparative Example.
図８に示すとおり、実施例２の測定結果では、手のひらの形が残らずに、手のひらに相当する部分が全体的にぼやけている。これは、透過板の裏面に接触した手のひらの熱が、透過板の面内に拡散して反対側の表面に伝わりにくくなっていることを示している。実施例２の測定結果では、最高温度も２８℃であり、３０℃以内である。こうした測定結果から、実施例２は、熱拡散性及び放熱性が良好であることがわかる。 As shown in FIG. 8, in the measurement result of Example 2, the palm shape does not remain and the part corresponding to the palm is totally blurred. This indicates that the heat of the palm in contact with the rear surface of the transmission plate is diffused in the plane of the transmission plate and is not easily transmitted to the opposite surface. In the measurement result of Example 2, the maximum temperature is also 28 ° C., which is within 30 ° C. From these measurement results, it can be seen that Example 2 has good thermal diffusibility and heat dissipation.
実施例１は、実施例２よりも熱伝導率が低いが、熱伝導率は１５０Ｗ／ｍＫ以上であるため、表２に示すとおり、実施例１の測定結果も、実施例２と同様に、熱拡散性及び放熱性の点で良好な結果が得られた。 Example 1 has a lower thermal conductivity than Example 2, but the thermal conductivity is 150 W / mK or higher, so as shown in Table 2, the measurement results of Example 1 are the same as in Example 2. Good results were obtained in terms of thermal diffusivity and heat dissipation.
これに対して、比較例の測定結果では、図８に示すように、手のひらの形や、手のひらのうち指先など透過板との接触圧が高い高温部分がはっきりと映し出されている。これは、透過板の裏面に接触した手のひらの熱が、透過板の面内で拡散せずに反対側の表面に伝わっていることを示している。また、比較例の測定結果では、最高温度も３５℃に達しており、３０℃を超えている。こうした測定結果から、比較例が、実施例１、２と比較して、熱拡散性及び放熱性の点で劣ることが確認された。 On the other hand, in the measurement result of the comparative example, as shown in FIG. 8, the shape of the palm and the high temperature portion where the contact pressure with the transmission plate such as the fingertip is high in the palm are clearly reflected. This indicates that the heat of the palm in contact with the rear surface of the transmission plate is transmitted to the opposite surface without being diffused in the plane of the transmission plate. Moreover, in the measurement result of the comparative example, the maximum temperature also reaches 35 ° C., and exceeds 30 ° C. From these measurement results, it was confirmed that the comparative example was inferior in terms of thermal diffusibility and heat dissipation compared to Examples 1 and 2.
以上説明したように、透過板２７の最外層に、熱伝導率が１５０Ｗ／ｍＫ以上のＰＩＴＣＨ系カーボンシートを使用することで、透過板２７の熱拡散性及び放熱性が上がるので、筐体２６の内部に熱が伝わりにくい。 As described above, by using a PITCH carbon sheet having a thermal conductivity of 150 W / mK or more for the outermost layer of the transmission plate 27, the heat diffusibility and heat dissipation of the transmission plate 27 are improved. Heat is not easily transmitted to the inside.
また、上記実施形態では、透過板２７の構成を、第１層８１から第３層８３の三層構成の例で説明したが、四層以上でもよい。また、上記実施例において示した、第１層８１から第３層８３の各層を構成するプリプレグの積層枚数は、１例であり、上記実施例の積層枚数以下でも以上でもよい。また、第１層８１から第３層８３の各層の間に別の層が挿入されていてもよい。また、本発明は、透過板２７の最外層にＰＩＴＣＨ系カーボンシートが使用されていればよく、例えば、第２層８２や第３層８３が無く、ＰＩＴＣＨカーボンシートが支持体上に構成されているだけでもよい。支持体は、Ｘ線透過性があればよく、カーボン材料であってもよいし、それ以外の材料でもよい。ただし、カーボン材料は、軽量で剛性が高く、かつＸ線透過性もよいというＸ線撮影用カセッテの基本性能を満たしているため、カーボン材料であることが好ましい。 Further, in the above embodiment, the configuration of the transmission plate 27 has been described with an example of a three-layer configuration from the first layer 81 to the third layer 83, but may be four or more layers. Further, the number of laminated prepregs constituting each of the first layer 81 to the third layer 83 shown in the above embodiment is one example, and may be equal to or less than the number of laminated layers in the above embodiment. Further, another layer may be inserted between each of the first layer 81 to the third layer 83. Further, in the present invention, a PITCH carbon sheet may be used as the outermost layer of the transmission plate 27. For example, the second layer 82 and the third layer 83 are not provided, and the PITCH carbon sheet is formed on the support. Just be there. The support is only required to be X-ray transparent, and may be a carbon material or other material. However, the carbon material is preferably a carbon material because it satisfies the basic performance of an X-ray imaging cassette that is lightweight and has high rigidity and good X-ray permeability.
上記実施形態では、透過板２７に被検者Ｈが接触して体温によって透過板２７に熱が伝わる場合を例に説明したが、透過板２７は筐体２６の外表面を構成するので、被検者Ｈの体温以外にも、筐体２６が置かれる環境によって熱的な外乱を受ける。被検者Ｈの体温以外の熱的な外乱によって透過板２７の面内において局所的に温度が上昇するような場合でも、本発明によれば、上記実施形態で説明したのと同様の効果がある。 In the above embodiment, the case where the subject H comes into contact with the transmission plate 27 and heat is transmitted to the transmission plate 27 due to body temperature has been described as an example. However, since the transmission plate 27 constitutes the outer surface of the housing 26, In addition to the body temperature of the examiner H, there is a thermal disturbance depending on the environment in which the housing 26 is placed. Even when the temperature locally rises in the plane of the transmission plate 27 due to a thermal disturbance other than the body temperature of the subject H, according to the present invention, the same effect as described in the above embodiment can be obtained. is there.
上記実施形態では、筐体の前面部を透過板と枠体で構成した形態で説明したが、筐体の前面部の全面が透過板で構成されていてもよい。 In the said embodiment, although demonstrated in the form which comprised the front part of the housing | casing with the permeation | transmission board and the frame, the whole surface of the front part of a housing | casing may be comprised with the permeation | transmission board.
上記実施形態では、放射線としてＸ線を例に説明したが、本発明は、γ線など、Ｘ線以外の放射線を使用するものでもよい。本発明は、上記実施形態に限定されるものではなく、発明の要旨を逸脱しない範囲で種々変形して実施することが可能である。 In the above embodiment, X-rays have been described as an example of radiation. However, the present invention may use radiation other than X-rays, such as γ-rays. The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.
１０ Ｘ線撮影システム
２１ 電子カセッテ
２６ 筐体
２７ 透過板
３１ ＦＰＤ（放射線画像検出器）
３５ 検出パネル（検出部）
３７ 画素
３８ 検出面
６１ シンチレータ
８１ 第１層
８２ 第２層
８３ 第３層
DESCRIPTION OF SYMBOLS 10 X-ray imaging system 21 Electronic cassette 26 Case 27 Transmission plate 31 FPD (radiation image detector)
35 Detection panel (detection unit)
37 pixels 38 detection surface 61 scintillator 81 first layer 82 second layer 83 third layer
Claims (2)
前記放射線画像検出器を収容する筐体と、
前記筐体において、前記放射線を透過して前記放射線画像検出器に入射させるための入射面を構成する透過板であり、前記筐体の外表面を構成する最外層となる第１層が、熱伝導率が１５０Ｗ／ｍＫ以上のＰＩＴＣＨ系炭素繊維で形成されたＰＩＴＣＨ系カーボン材料で構成された透過板とを備え、
前記透過板は、前記第１層よりも内部側に位置する第２層がＰＡＮ系炭素繊維で形成されたＰＡＮ系カーボン材料で構成されていることを特徴とする放射線撮影用電子カセッテ。 A radiation image detector for detecting a radiation image of the subject in response to radiation that has passed through the subject;
A housing for housing the radiation image detector;
In the housing, a transmission plate constituting an incident surface for transmitting the radiation and entering the radiation image detector, and a first layer serving as an outermost layer constituting the outer surface of the housing is a heat A transmission plate made of a PITCH-based carbon material formed of a PITCH-based carbon fiber having a conductivity of 150 W / mK or more ,
2. The radiographic electronic cassette according to claim 1, wherein the transmission plate is made of a PAN-based carbon material in which a second layer located on the inner side of the first layer is formed of a PAN-based carbon fiber .
The transmission plate has a sandwich structure in which a third layer located on the inner side of the second layer is composed of the PITCH-based carbon material, and the second layer is sandwiched by the PITCH-based carbon material from both sides. 2. The electronic cassette for radiography according to claim 1 , wherein the electronic cassette is provided.
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