Patent ID: 6104775
Filing Date: 2000-08-15
Classification: A61B,G06T,Y10S

Abstract:
A method of image reconstruction from wedge beam data comprising:(a) collecting cone beam data in two-dimensional arrays, said collected data corresponding to rays of penetrating radiation diverging in two dimensions from a common vertex as the vertex travels along a curve with each element of the data related to line integrals of an object being reconstructed taken along each ray;(b) defining a local coordinate system having three mutually orthogonal axes and an origin at the vertex, wherein a third axis thereof extends in a direction tangential to the curve at the vertex;(c) rebinning the collected data into a wedge beam format, wherein sets of parallel rays are grouped to define planes of radiation that angularly diverge from a common axis;(d) computing a one-dimensional convolution of the rebinned data in the local coordinate system along a direction parallel to the third axis;(e) weighting the convolved data; and,(f) three-dimensionally backprojecting the weighted convolution.