[특허]Computer tomography apparatus using image intensifier detector

Computer tomography apparatus using image intensifier detector 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61B-006/00
출원번호	US-0352269 (1994-12-07)
발명자 / 주소	Seppi Edward J. (Portola Valley CA) Shapiro Edward G. (Mountain View CA) Anderson Robert L. (Palo Alto CA)
출원인 / 주소	Varian Associates, Inc. (Palo Alto CA 02)
인용정보	피인용 횟수 : 86 인용 특허 : 35

초록 ▼

Disclosed is a low cost computer tomographic (CT) scanner system specifically designed for radiation therapy treatment planning. A 512-channel photo-diode array with digitizing electronics converts image intensifier optical projection data directly into digital signals and has a dynamic range on the order of 100,000:1. The new simulator includes a rotating gantry, an X-ray generator with radiographic and fluoroscopic modes and a therapy style patient support assembly. Results on head and body size phantoms indicate that the simulator X-ray generator and image intensifier tube (IIT) with multi-channel photo-detector can produce photon statistic limited CT images. Software and hardware compensation methods are described which minimize geometrical distortions. Low noise, high input impedance electronics are employed which are phase-locked to the line frequency. A dual sample interval method is employed which effectively increases the range of the digital signal produced by the front-end electronics by three additional bits.

대표청구항 ▼

A radiation therapy X-ray simulator having an X-ray source providing a fan beam, a gantry to support the X-ray source, a couch to support a patient and an image forming system including a computer for fan beam reconstruction without reordering, wherein the simulator is constructed such that the X-ray source is positioned relative to the couch in a geometry essentially identical to the geometry of the same elements of a target radiotherapy machine, the improvement comprising: said image forming system includes a first X-ray detector being an image intensifier (IIT) for converting X-rays from said source to electrons after said X-rays have passed through a patient, and for accelerating said electrons to an output phosphor screen to provide visible light, said first X-ray detector having a first quantum efficiency; a photo diode linear array detector, said photo diode linear array detector replacing a TV camera, a plurality of photo diodes in said photo diode linear array detector having a second quantum efficiency of approximately 0.6 or more electrons per photon and a dynamic range on the order of 35,000 to 1, said photo diode linear array detector providing an electrical signal the amplitude of which is responsive to the intensity of said visible light; a lens means, said lens means being interposed between said output phosphor screen and said photo diode detector for coupling visible radiation from said image intensifier to said photo diode detector, said lens means having a third quantum efficiency; wherein an X-ray beam from said X-ray source becomes reduced in intensity as it passes through a portion of a patient and impinges upon said X-ray detector of said IIT at a first point and causes the emission of a visible light ray having an intensity which corresponds to the intensity of the impinging ray and spatially corresponds to said first point, and where said visible light ray passes through said lens means and intersects said photo diode detector at a second point, which second point spatial position and intensity correspond to the spatial position and intensity of said first point; and wherein the product of said first, second and third quantum efficiencies is greater than unity.

이 특허에 인용된 특허 (35)

Pavkovich John M. (Palo Alto CA), Apparatus and method for reconstructing data.
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Pavkovich John M. (Palo Alto CA), Apparatus and method for reconstructing data.
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Duinker Simon (Bloemendaal NLX), Apparatus for scanning and processing information obtained by successively irradiating an object from a plurality of dir.
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Flannery Brian P. (Clinton NJ) Deckman Harry W. (Clinton NJ) Eisenberger Peter M. (Morristown NJ) Roberge Wayne G. (Hopewell NJ), Apparatus for three dimensional tomography utilizing an electro-optic x-ray detector.
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Duinker Simon (Bloemendaal NLX) Mulder Hendrik (Delft NLX), Apparatus for tomography.
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McCroskey William K. (Solon OH) Vickers David S. (Macedonia OH) Carlson Roland W. (Cleveland OH) Zahn Robert L. (Bainbridge OH) Drobny Jack A. (Seven Hills OH), Detector imaging arrangement for an industrial CT device.
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Weiss Hermann (Hamburg DEX) Kowalski Gunter (Hamburg DEX), Device for measuring the absorption of radiation in a slice of a body.
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Seppi Edward J. (Portola Valley CA) Shapiro Edward G. (Mountain View CA) Pavkovich John M. (Palo Alto CA), Electronically enhanced X-ray detector apparatus.
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Alston Lawrence E. (Chelmsford MA) Levinstone Donald S. (Cambridge MA) Plummer William T. (Concord MA), Exposure control system for an electronic imaging camera having increased dynamic range.
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Greskovich Charles D. (Schenectady NY) Minnear William P. (Schenectady NY) Chernoch Joseph P. (Scotia NY) Hoffman David M. (New Berlin WI) Riedner Robert J. (Waukesha WI), High speed, radiation tolerant, CT scintillator system employing garnet structure scintillators.
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Bastiaens Raoul J. M. H. (Eindhoven NLX) Van Twist Paulus H. F. M. (Eindhoven NLX), Image sensing device.
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Ueda Ken (Ome JPX) Umetani Keiji (Fuchu JPX) Suzuki Yoshio (Kodaira JPX), Imaging system for obtaining X-ray energy subtraction images.
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Horbaschek Heinz (Erlangen DEX), Medical diagnostics system having optimized signal acquisition for radiation exposure control.
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Boyd Douglas P. (Palo Alto CA), Method and apparatus for X-ray or g 상세보기

IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Computer tomography apparatus using image intensifier detector 원문보기

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Computer tomography apparatus using image intensifier detector 원문보기

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연구과제 타임라인

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