发明名称 |
COMPUTED TOMOGRAPHY APPARATUS USING IMAGE INTENSIFIER DETECTOR |
摘要 |
<p>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.</p> |
申请公布号 |
EP0489904(A4) |
申请公布日期 |
1993.05.05 |
申请号 |
EP19910913217 |
申请日期 |
1991.07.02 |
申请人 |
VARIAN ASSOCIATES, INC. |
发明人 |
SEPPI, EDWARD, J.;SHAPIRO, EDWARD, G.;ANDERSON, ROBERT, L. |
分类号 |
A61B6/03;H04N5/32;H05G1/64;(IPC1-7):G06F15/42 |
主分类号 |
A61B6/03 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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