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 1090481
Application for Patent of Douglas P. Boyd and Michael C. Goitein for FAN BEAM X- OR Y- RAY 3-D TOMOGRAPHY ABSTRACT OF THE DISCLOSURE A fan-shaped beam of penetrating radiation, such as X-ray or .gamma.-ray radiation, is directed through a slice of the body to be analyzed to a position sensitive detector for deriving a shadowgraph of transmission or absorption of the penetrating radiation by the body. A number of 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 corresponding to sets of parallel paths of radiation through the body. The reordered parallel path shadowgraph data is then convoluted in accordance with a 3-D reconstruction method by 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 between 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.
240741
Boyd Douglas P.
Goitein Michael
Board Of Trustees Of Leland Stanford Jr. University
Smart & Biggar
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