Affiliations: Radiology Department, The University of Chicago,
Chicago, IL, USA
Note: [] Corresponding author: D. Xia, Radiology Department, The
University of Chicago, 5841 S. Maryland Avenue, Chicago, IL 60637, USA. E-mail:
danxia@uchicago.edu
Abstract: 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.
