Fast Exact/Quasi-Exact FBP Algorithms for Triple-Source Helical Cone-Beam CT

Abstract—Cardiac computed tomography (CT) has been improved over past years, but it still needs improvement for higher temporal resolution in the cases of high or irregular cardiac rates. Given successful applications of dual-source cardiac CT scanners, triple-source cone-beam CT seems a promising mode for cardiac CT. In this paper, we propose two filtered-backprojection algorithms for triple-source helical cone-beam CT. The first algorithm utilizes two families of filtering lines. These lines are parallel to the tangent of the scanning trajectory and the so-called lines. The second algorithm utilizes two families of filtering lines tangent to the boundaries of the Zhao window and lines, respectively, but it eliminates the filtering paths along the tangent of the scanning trajectory, thus reducing the required detector size greatly. The first algorithm is theoretically exact for 0 265 and quasi-exact for 0 265 0 495 , and the second algorithm is quasi-exact for 0 495 , where an...

• Type: Journal
• Year: 2010
• Where: TMI
• Authors: Yang Lu, Alexander Katsevich, Jun Zhao, Hengyong Yu, Ge Wang
• Keywords: Algorithms, Cone-beam Ct, TMI 2010, first Algorithm