Tilted plane Feldkamp type reconstruction algorithm for spiral cone-beam CT

An approximation image reconstruction method for spiral cone-beam computed tomography (CT), called tilted plane Feldkamp type reconstruction algorithm (TPFR), is presented in this paper, which extends the Feldkamp cone-beam reconstruction algorithm to overcome its inaccuracy problem caused by large cone-angle. This is done by tilting the reconstructing planes to minimize the cone angle and optimally fit the spiral segment of the source. After reconstruction of the tilted plane images, a subsequent interpolation step reforms the tilted plane images to plane images perpendicular to the z-axis. Simulations of Shepp-Logan phantom can show that the image reconstruction performance of the proposed TPFR algorithm is superior to that of the conventional Feldkamp type reconstruction algorithm.