专利名称：Image reconstruction发明人：Tuy, Heang K.申请号：EP99308243.7申请日：19991019公开号：EP0997849A2公开日：20000503
专利附图：
摘要：A method of image reconstruction from wedge beam data includes collectingcone beam data in two-dimensional arrays. The collected data corresponds to rays ofpenetrating radiation diverging in two dimensions from a common vertex which travelsalong a curve. Each element of the data is related to line integrals of an object being
reconstructed taken along each ray. A local coordinate system is defined having threemutually orthogonal axes and an origin at the vertex. The third axis of the localcoordinate system extends in a direction tangential to the curve at the vertex. Thecollected data is rebinned into a wedge beam format wherein sets of parallel rays aregrouped to define planes of radiation that angularly diverge from a common axis. A one-dimensional convolution of the rebinned data is computed in the local coordinate systemalong a direction parallel to the third axis. Finally, the convolved data is weighted andthree-dimensionally backprojected. In a preferred embodiment, the curve defines ahelical path, and the kernel for the one-dimensional convolution of the rebinned data is aramp convolver.
申请人：PICKER INTERNATIONAL, INC.
地址：595 Miner Road Cleveland, Ohio 44143 US
国籍：US
代理机构：Waters, Jeffrey
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