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1: Phys Med Biol. 2005 May 7;50(9):2099-111. Epub 2005 Apr 20.Click here to read Links

A backprojection-filtration algorithm for nonstandard spiral cone-beam CT with an n-PI-window.

Yu H, Ye Y, Zhao S, Wang G.

CT/Micro-CT Laboratory, Department of Radiology, University of Iowa, Iowa City, IA 52242, USA.

For applications in bolus-chasing computed tomography (CT) angiography and electron-beam micro-CT, the backprojection-filtration (BPF) formula developed by Zou and Pan was recently generalized by Ye et al to reconstruct images from cone-beam data collected along a rather flexible scanning locus, including a nonstandard spiral. A major implication of the generalized BPF formula is that it can be applied for n-PI-window-based reconstruction in the nonstandard spiral scanning case. In this paper, we design an n-PI-window-based BPF algorithm, and report the numerical simulation results with the 3D Shepp-Logan phantom and Defrise disk phantom. The proposed BPF algorithm consists of three steps: cone-beam data differentiation, weighted backprojection and inverse Hilbert filtration. Our simulated results demonstrate the feasibility and merits of the proposed algorithm.

PMID: 15843739 [PubMed - indexed for MEDLINE]