IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0454200
(1982-12-29)
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발명자
/ 주소 |
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| 출원인 / 주소 |
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| 대리인 / 주소 |
Leydig, Voit & Mayer, Ltd.
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| 인용정보 |
피인용 횟수 :
15 인용 특허 :
10 |
초록
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A solid state detector in which each scintillator is optimally configured and coupled with its associated sensing diode in a way which exploits light piping effects to enhance efficiency, and at the same time provide a detector which is modular in nature. To achieve light piping, the scintillator cr
A solid state detector in which each scintillator is optimally configured and coupled with its associated sensing diode in a way which exploits light piping effects to enhance efficiency, and at the same time provide a detector which is modular in nature. To achieve light piping, the scintillator crystal is oriented such that its sides conform with the crystal cleavage plane, and the sides are highly polished. An array of tungsten collimator plates define the individual channels. Multi-channel scintillator/diode modules are mounted behind and in registry with the plurality of collimator plates. A plurality of scintillators are bonded together after coating the surfaces thereof to minimize optical crosstalk. After lapping the face of the scintillator module, it is then bonded to a diode module with individual scintillators in registration with individual diodes. The module is then positioned in the detector array with collimator plates at the junctions between the scintillators.
대표청구항
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1. A scintillator/diode module for use in a solid state x-ray detector comprising, in combination, a diode module having a plurality of individual diodes, a similar plurality of scintillators, each scintillator comprising a crystal having an index of refraction which differs as a function of directi
1. A scintillator/diode module for use in a solid state x-ray detector comprising, in combination, a diode module having a plurality of individual diodes, a similar plurality of scintillators, each scintillator comprising a crystal having an index of refraction which differs as a function of direction through the crystal lattice, the lowest index direction being parallel to the cleavage plane, each scintillator having a front face for receiving x-rays, a rear face for coupling with a diode, and juxtaposed sides, each scintillator being oriented such that the cleavage plane thereof conforms to the sides, and means for causing each scintillator to serve as a light pipe from front to rear including polished sides on each scintillator, coating means on the sides for minimizing crosstalk between scintillators, said plurality of scintillators being joined at the sides for forming a scintillator module, and optical coupling means joining the scintillator module to the diode module with the scintillators in registration with the respective diodes. 2. The module as set out in claim 1 wherein the scintillators are cadmium tungstate. 3. The module as set out in claim 2 wherein the scintillator includes means for causing the scintillator to de-trap light, said last mentioned means including roughened surfaces on all of the scintillator faces except the sides. 4. The module as set out in claim 2 wherein the faces of the scintillator except for the rear face are coated with a coating of TiO 2 suspended in a binder. 5. In a solid state x-ray detector having a plurality of channels for converting incident x-ray flux into corresponding electrical signals, the improvement comprising, an array of collimator plates defining the channels, a modular scintillator/diode assembly registered behind a plurality of said plates, and including: a plurality of scintillator bars each comprising a crystal having an index of refraction which differs as a function of direction through the crystal lattice, the lowest index direction being parallel to the cleavage plane, and each having a front face for receiving x-rays, a rear face for transmitting light and two sides, each scintillator being oriented so that the cleavage plane conforms to the sides, means for causing each scintillator to act as a light pipe from front to rear including polished sides on each scintillator, coating means on the scintillator sides for minimizing light penetration through the sides of each scintillator, a plurality of said scintillators being joined at the sides for forming a scintillator module, a diode module positioned behind the scintillator module with individual diodes in registration with individual scintillators, and optical coupling means joining the diode module to the scintillator module. 6. The improvement as set out in claim 5 wherein the scintillator is cadmium tungstate. 7. The improvement as set out in claim 6 wherein the scintillator includes means for causing the scintillator to de-trap light, said last mentioned means including roughened surfaces on all of the scintillator faces except the sides. 8. The improvement as set out in claim 6 wherein the faces of the scintillator except for the rear face are coated with a coating of TiO 2 suspended in a binder. 9. The improvement as set out in claim 5 wherein the scintillator module has a rear face for joining to the diode module, said rear face being lapped for enhancing flatness and roughness.
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