Patent Document ID: 4888693
Application ID: 07032804
Patent Status: 1

Claim One:
1. A method of obtaining object boundary information in limited-angle x-ray computerized tomography comprising: exposing said object to x-rays at multiple scanning angles within a limited angular range and generating x-ray projection data; processing, said projection data by doing curve fitting near the edges to more precisely determine end points between attenuated and unattenuated x-rays; backprojecting the projection data between said end points at every scanning angle to yield a backprojection strip which contains the support of said object, defined as the region where object density is non-zero; overlapping all of said backprojection strips to construct a region which is a polygon and the convex hull of said object, the smallest convex region containing said object; and using said constructed region as a priori information on the extent and location of said object and other a priori information, reconstruct and display said object by means of a limited-angle reconstruction technique.