H - Electricity – 05 – G
Patent
H - Electricity
05
G
358/11.1
H05G 1/00 (2006.01) A61B 6/03 (2006.01) G01T 1/29 (2006.01) H01J 47/06 (2006.01)
Patent
CA 1087323
Application for Patent of Douglas P. Boyd for METHOD AND APPARATUS FOR X-RAY OR .gamma.-RAY 3-D TOMOGRAPHY USING A FAN BEAM ABSTRACT OF THE DISCLOSURE A fan-shaped beam of penetrating radiation, such as X-ray or y-ray radiation, is directed through a slice of the body to be analyzed to a position sensitive detector for deriving a shadow- graph of transmission or absorption of the penetrating radiation by the body. A number of such shadowgraphs are obtained for different angles of rotation of the fan-shaped beam relative to the center of the slice being analyzed. The detected fan beam shadowgraph data is reordered into shadowgraph data corres- ponding to sets of parallel paths of radiation through the body. The reordered parallel paths shadowgraph data is then convoluted in accordance with a 3-D reconstruction method of convolution in a computer to derive a 3-D reconstructed tomograph of the body under analysis. In a preferred embodiment, the position sensitive detector comprises a multiwire detector wherein the wires are arrayed parallel to the direction of the divergent penetrating rays to be detected. A focused grid collimator is interposed be- tween the body and the position sensitive detector for collimating the penetrating rays to be detected. The source of penetrating radiation is preferably a monochromatic source.
240717
Board Of Trustees Of Leland Stanford Jr. University
Smart & Biggar
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