JP6548536B2 - Radiation detector and X-ray CT apparatus - Google Patents
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- 230000005855 radiation Effects 0.000 title claims description 36
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Description
本発明の実施形態は、放射線検出器及びＸ線ＣＴ装置に関する。 Embodiments of the present invention relate to a radiation detector and an X-ray CT apparatus.
Ｘ線ＣＴ装置の放射線検出器は、配線基板上に設けられた二次元アレイ状のフォトダイオード素子と、この二次元アレイ状のフォトダイオード素子の上に二次元アレイ状のシンチレータ素子を積層配置することで構成されている（例えば、特許文献１参照。）。このように構成された放射線検出器は、Ｘ線管の焦点を中心とした円弧状に配置されている。 The radiation detector of the X-ray CT apparatus has a two-dimensional array of photodiode elements provided on a wiring substrate and a two-dimensional array of scintillator elements stacked on the two-dimensional array of photodiode elements. (See, for example, Patent Document 1). The radiation detector configured in this way is arranged in an arc around the focal point of the X-ray tube.
近年、Ｘ線ＣＴ装置のスライス数の増加に伴って検出信号を外部に引き出すための配線の密度が増大すると共に配線の取り回しも複雑になる。これに対応するため、配線長の短縮によりノイズ低減を図り、センサ、信号処理、制御のそれぞれの接続部の小型化（コネクタレス化）が行われている。また、接続・部品搭載領域の確保が課題となっている。 In recent years, as the number of slices in an X-ray CT apparatus increases, the density of wiring for extracting detection signals to the outside increases and wiring management also becomes complicated. In order to cope with this, noise reduction is achieved by shortening the wiring length, and miniaturization (connectorless processing) of each connection portion of sensor, signal processing and control is performed. In addition, securing of connection / part mounting area is an issue.
さらに、配線数の増大に対応するため、信号線の引出し方向を基板の両側にすると、その後の製品の組立性が低下する。このため、製品の組立性を考慮した放射線検出器及びＸ線ＣＴ装置が必要とされている。 Furthermore, in order to cope with the increase in the number of wires, if the lead-out directions of the signal lines are on both sides of the substrate, the assemblability of the subsequent products is reduced. Therefore, there is a need for a radiation detector and an X-ray CT apparatus in consideration of the assemblability of the product.
本発明の実施形態の放射線検出器は、表面、裏面及び内部に配線が設けられた配線基板と、この配線基板の表面に実装された放射線検出センサと、前記配線基板の裏面に一端側が取り付けられると共に、前記配線基板の裏面の取付領域に対向する位置に開口部を有し、他端側は外部出力端子を有すると共に前記配線基板の一側面側に引き出されているフレキシブル基板と、前記取付領域に実装され、前記放射線検出センサの出力端子と接続されると共に、前記フレキシブル基板との接続部を有する中継基板と、この中継基板に実装され、前記放射線検出センサからの出力信号が入力されると共に前記中継基板の前記接続部に接続される信号処理ＩＣとを備えている。 The radiation detector according to the embodiment of the present invention has a wiring board provided with wiring on the front surface, the back surface, and the inside, a radiation detection sensor mounted on the front surface of the wiring substrate, and one end side attached to the back surface of the wiring substrate And a flexible substrate having an opening at a position facing the mounting area on the back surface of the wiring board, and having an external output terminal on the other end side, the flexible board being drawn out to one side of the wiring board, and the mounting area Mounted on the output terminal of the radiation detection sensor and connected to the relay substrate having a connection portion with the flexible substrate, and mounted on the relay substrate, the output signal from the radiation detection sensor being input And a signal processing IC connected to the connection portion of the relay substrate.
図１は第１の実施の形態に係る放射線検出器１０の表面側を示す斜視図、図２は放射線検出器１０の裏面側を示す斜視図、図３は放射線検出器１０が組み込まれたＸ線ＣＴ装置１００を模式的に示す説明図である。 1 is a perspective view showing the front side of the radiation detector 10 according to the first embodiment, FIG. 2 is a perspective view showing the back side of the radiation detector 10, and FIG. FIG. 2 is an explanatory view schematically showing a line CT apparatus 100.
放射線検出器１０は、セラミックス材製の配線基板２０を備えている。配線基板２０は、板状の基板本体２１と、この基板本体２１の表面２１ａ、裏面２１ｂ、内部２１ｃに金属配線を有している。また、基板本体２１の表面２１ａ及び裏面２１ｂには、端子が設けられている。 The radiation detector 10 is provided with a wiring substrate 20 made of a ceramic material. The wiring substrate 20 has a plate-like substrate body 21 and metal wiring on the surface 21 a, the back surface 21 b, and the inside 21 c of the substrate body 21. Further, terminals are provided on the surface 21 a and the back surface 21 b of the substrate body 21.
配線基板２０の表面２１ａには、放射線検出センサ２５が実装されている。放射線検出センサ２５は、チャンネル方向（ｘ方向）とスライス方向（ｙ方向）の２次元方向に配列された複数のフォトダイオードと、シンチレータとが積層配置されている。また、配線基板２０の裏面２１ｂには、取付領域２２が設けられている。 A radiation detection sensor 25 is mounted on the surface 21 a of the wiring substrate 20. In the radiation detection sensor 25, a plurality of photodiodes arranged in a two-dimensional direction of the channel direction (x direction) and the slice direction (y direction) and a scintillator are stacked and arranged. Further, an attachment area 22 is provided on the back surface 21 b of the wiring substrate 20.
フレキシブル基板３０の一端側３１が取り付けられている。フレキシブル基板３０の一端側は、開口部３３が設けられ、取付領域２２に対向している。フレキシブル基板３０は、配線基板２０の裏面２１ｂと平行に配置され、フレキシブル基板３０の他端側３２は配線基板２０の一側面側に延出している。なお、複数のフレキシブル基板３０の延出方向は一方向に統一されている。フレキシブル基板３０は、柔軟なフィルム状の基材３０ａを有し、その表面３０ｂ側が配線基板２０の裏面２１ｂ上の端子に、Ａｕバンプ等の金属バンプと異方性導電膜との組合せによって接合されている。 One end 31 of the flexible substrate 30 is attached. An opening 33 is provided on one end side of the flexible substrate 30 and is opposed to the attachment area 22. The flexible substrate 30 is disposed in parallel with the back surface 21 b of the wiring substrate 20, and the other end 32 of the flexible substrate 30 extends to one side surface of the wiring substrate 20. The extension direction of the plurality of flexible substrates 30 is unified in one direction. The flexible substrate 30 has a flexible film-like base 30a, and the surface 30b side is joined to a terminal on the back surface 21b of the wiring substrate 20 by a combination of metal bumps such as Au bumps and an anisotropic conductive film ing.
配線基板２０の取付領域２２には、中継基板４０が取り付けられている。中継基板４０は、板状の基板本体４１と、この基板本体４１の表面４１ａ、裏面４１ｂ、内部４１ｃに金属配線を有している。また、基板本体４１の表面４１ａ及び裏面４１ｂには、端子が設けられている。中継基板４０の表面４１ａの端子は、配線基板２０の裏面２１ｂの端子と接続されている。 A relay substrate 40 is attached to the attachment area 22 of the wiring substrate 20. The relay substrate 40 has a plate-like substrate main body 41, and metal wiring on the surface 41a, the back surface 41b, and the inside 41c of the substrate main body 41. Further, terminals are provided on the front surface 41 a and the back surface 41 b of the substrate main body 41. The terminals on the front surface 41 a of the relay substrate 40 are connected to the terminals on the back surface 21 b of the wiring substrate 20.
中継基板４０の裏面４１ｂには、放射線検出センサ３０からの信号が入力され、処理を行う信号処理ＩＣ（ＡＳＩＣ）５０が実装されている。中継基板４０の裏面４１ｂの電極と信号処理ＩＣ５０の入力端子とは接続されている。 On the back surface 41b of the relay substrate 40, a signal processing IC (ASIC) 50 that receives a signal from the radiation detection sensor 30 and performs processing is mounted. The electrode on the back surface 41 b of the relay substrate 40 and the input terminal of the signal processing IC 50 are connected.
さらに信号処理ＩＣ５０の出力端子は、中継基板４０の裏面４１ｂ上の端子に接続され、さらにボンディングワイヤ４３を経由して、フレキシブル基板３０上の裏面３０ｃ上の端子に接続される。 Further, the output terminal of the signal processing IC 50 is connected to the terminal on the back surface 41 b of the relay substrate 40, and is further connected to the terminal on the back surface 30 c on the flexible substrate 30 via the bonding wire 43.
フレキシブル基板３０ｃ上の端子は、他端３２側に引き出されて、後述する検出器回路１１６に接続される。 The terminal on the flexible substrate 30c is drawn to the other end 32 side and connected to a detector circuit 116 described later.
Ｘ線ＣＴ装置１００は、図３に示すように、架台部１１０と画像再構成部１２０とを備える。架台部１１０には、被検体が搬入される開口部１１４を備えた回転円板１１１が備えられている。この回転円板１１１にＸ線管１１２と、Ｘ線管１１２に取り付けられ、Ｘ線束の放射方向を制御するコリメータ１１３と、Ｘ線管３１２と対向して回転円板１１１に搭載された放射線検出器１０と、放射線検出器１０で検出されたＸ線を所定の信号に変換する検出器回路１１６が搭載されている。また、架台部１１０は、回転円板１１１の回転及びＸ線管１１２を制御するスキャン制御回路１１７をさらに備えている。 As shown in FIG. 3, the X-ray CT apparatus 100 includes a gantry 110 and an image reconstruction unit 120. The gantry 110 is provided with a rotating disc 111 having an opening 114 into which the subject is carried. An X-ray tube 112 and an X-ray tube 112 are attached to the rotating disc 111, a collimator 113 for controlling the radiation direction of the X-ray flux, and a radiation detection mounted on the rotating disc 111 opposite to the X-ray tube 312. And a detector circuit 116 for converting the X-ray detected by the radiation detector 10 into a predetermined signal. Further, the gantry unit 110 further includes a scan control circuit 117 that controls the rotation of the rotary disk 111 and the X-ray tube 112.
放射線検出器１０は、放射線検出センサ２５は、Ｘ線管１１２の焦点位置に向けられている。フレキシブル基板３０の他端３２側に設けられた端子は、検出器回路１１６に接続され、信号処理ＩＣ５０が出力した電気信号を検出器回路１１６に受け渡す。 In the radiation detector 10, the radiation detection sensor 25 is directed to the focal position of the X-ray tube 112. A terminal provided on the other end 32 side of the flexible substrate 30 is connected to the detector circuit 116, and passes the electrical signal output from the signal processing IC 50 to the detector circuit 116.
画像再構成部１２０は、検出器回路１１６から送出される計測データを演算処理してＣＴ画像再構成を行い、ディスプレイモニタ１３０へ出力する。 The image reconstruction unit 120 performs arithmetic processing on measurement data sent from the detector circuit 116 to perform CT image reconstruction, and outputs the CT image to the display monitor 130.
このように構成された放射線検出器１０を有するＸ線ＣＴ装置１００では、架台部１１０の開口部１１４に、被検者を挿入し、Ｘ線管１１２からＸ線を照射する。このＸ線はコリメータ１１３により指向性を得て、放射線検出器１０により検出される。この際、回転円板３１１を被検者の周りに回転させることにより、Ｘ線を照射する方向を変えながら、被検者を透過したＸ線を検出する。この計測データをもとに画像再構成部３２０は、画像再構成を行い、ＣＴ画像（断層像）を生成し、ＣＴ画像をディスプレイモニタ３３０に表示する。 In the X-ray CT apparatus 100 having the radiation detector 10 configured as described above, a subject is inserted into the opening 114 of the gantry 110, and the X-ray tube 112 emits X-rays. The X-rays are directed by the collimator 113 and detected by the radiation detector 10. At this time, by rotating the rotating disk 311 around the subject, the X-rays transmitted through the subject are detected while changing the direction of irradiating the X-rays. The image reconstruction unit 320 reconstructs an image based on the measurement data, generates a CT image (tomographic image), and displays the CT image on the display monitor 330.
放射線検出器１０は、上述したようにフレキシブル基板３０が配線基板１０に対し、一方向にのみ延出されている。このため、複数の方向にフレキシブル基板が延出している構成に比べ、ケーブル等への接続作業が容易となり、組立性が向上する。このため、Ｘ線ＣＴ装置のスライス数の増加に伴って検出信号を外部に引き出すための配線の密度が増大した場合であっても、組立性が良いＸ線ＣＴ装置を提供することができる。 In the radiation detector 10, as described above, the flexible substrate 30 is extended relative to the wiring substrate 10 in only one direction. Therefore, as compared with the configuration in which the flexible substrate extends in a plurality of directions, the connection work to a cable or the like is facilitated, and the assemblability is improved. Therefore, even if the density of the wiring for extracting the detection signal to the outside increases with the increase in the number of slices of the X-ray CT apparatus, it is possible to provide the X-ray CT apparatus with good assemblability.
また、配線基板２０とフレキシブル基板３０とは、金属バンプと異方性導電膜による接続を行うことで、コネクタ類が不要となり、全体を薄く、小型に構成することができる。 Further, since the wiring substrate 20 and the flexible substrate 30 are connected by the metal bumps and the anisotropic conductive film, connectors are not necessary, and the whole can be made thin and small.
さらに、放射線検出センサ２５からの出力信号を配線基板２０、中継基板２５の内部を通じて信号処理ＩＣ５０に接続しているため、配線長を短くすることができ、ノイズが混入する虞を低減することができる。 Furthermore, since the output signal from the radiation detection sensor 25 is connected to the signal processing IC 50 through the inside of the wiring board 20 and the relay board 25, the wiring length can be shortened, and the possibility of noise mixing can be reduced. it can.
本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.
１０…放射線検出器、２０…配線基板、２５…放射線検出センサ、３０…フレキシブル基板、４０…中継基板、５０…信号処理ＩＣ、１００…Ｘ線ＣＴ装置。 DESCRIPTION OF SYMBOLS 10 Radiation detector 20 Wiring board 25 Radiation detection sensor 30 Flexible board 40 Relay board 50 Signal processing IC 100 X-ray CT apparatus
Claims (4)
この配線基板の表面に実装された放射線検出センサと、
前記配線基板の裏面に一端側が取り付けられると共に、前記配線基板の裏面の取付領域に対向する位置に開口部を有し、他端側は外部出力端子を有すると共に前記配線基板の一側面側に引き出されているフレキシブル基板と、
前記取付領域に実装され、前記放射線検出センサの出力端子と接続されると共に、前記フレキシブル基板との接続部を有する中継基板と、
この中継基板に実装され、前記放射線検出センサからの出力信号が入力されると共に前記中継基板の前記接続部に接続される信号処理ＩＣとを備えていることを特徴とする放射線検出器。 A wiring substrate provided with wiring on the front surface, the back surface, and the inside;
A radiation detection sensor mounted on the surface of the wiring board;
One end side is attached to the back surface of the wiring board, and an opening is provided at a position facing the attachment area on the back surface of the wiring board, and the other end side has an external output terminal and is drawn out to one side of the wiring board Flexible substrate, and
A relay board mounted on the attachment area, connected to an output terminal of the radiation detection sensor, and having a connection portion with the flexible board;
A radiation detector comprising: a signal processing IC which is mounted on the relay substrate and to which an output signal from the radiation detection sensor is input and which is connected to the connection portion of the relay substrate.
前記回転円板の開口を挟んだ位置に搭載されたＸ線源及び請求項１〜３のいずれかに記載された放射線検出器と、
前記回転円板の開口に被検体を挿入するための寝台とを備えていることを特徴とするＸ線ＣＴ装置。 A rotating disc having an opening,
An X-ray source mounted at a position sandwiching the opening of the rotating disk, and the radiation detector according to any one of claims 1 to 3;
An X-ray CT apparatus comprising: a bed for inserting a subject into the opening of the rotating disk.
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