Image reconstruction in reduced circular sinusoidal cone beam CT.
Non circular scanning geometries such as helix or circular sinusoid have been used or proposed for cone beam computed tomography (CBCT) because they provide sufficient data for numerically stable and exact image reconstruction within the scanned volume. Analytic algorithms have been developed for image reconstruction from cone beam data acquired with a full scan circular sinusoidal trajectory. In this work, we propose an innovative imaging approach in which a reduced scan circular sinusoidal trajectory is used for acquiring data sufficient for exact 3D image reconstruction. A filtered backprojection (FBP) algorithm based on Pack Noo's reconstruction formula is applied for image reconstruction in reduced scan circular sinusoidal scans. We have conducted numerical studies to demonstrate the reduced scan approach and to validate the FBP reconstruction algorithm in the proposed approach. The proposed scanning method can contribute to increasing the throughput of a scanner, while improving the image quality compared to a conventional circular scan.
Journal of X ray science and technology