Surgery – Truss – Pad
Patent
1994-12-07
1997-12-02
Lateef, Marvin M.
Surgery
Truss
Pad
128920, 378DIG16, 378 19, 378 988, A61B 600
Patent
active
056925077
ABSTRACT:
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.
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Anderson Robert L.
Seppi Edward J.
Shapiro Edward G.
Lateef Marvin M.
Shaw Shawna J.
Varian Associates Inc.
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