CONTOUR RECONSTRUCTION IN 3-D X-RAY CT

We derive an algorithm for reconstructing contours of an object from 3 -D cone beam x-ray data. By reducing the amount of the searched-for in formation, contours, or density jumps instead of the densities themsel ves, we are able to develop fast algorithms for data incomplete with r espect to both the movement of the x-ray source and the detector readi ng. The method is related to local or Lambda tomography. Numerical sim ulations show the efficiency of the algorithm.