FAN-BEAM RECONSTRUCTION FROM A STRAIGHT-LINE OF SOURCE POINTS

A novel fan-beam tomographic reconstruction algorithm is developed for source points distributed along a straight line. It is shown that, in theory, a perfect reconstruction is possible from an infinitely long straight line. Using computer simulations it is then verified that usi ng a finite segment of a straight line, it is possible to reconstruct images with quality comparable to those. obtained when the source poin ts are distributed along a circle. It is shown that the two parameters that most affect the image quality are: 1) the length of source point line, 2) the distance from the object to source point line. In additi on, a postreconstruction technique is developed that substantially imp roves the quality of images reconstructed from the straight line.