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Proceedings Paper

Novel C-arm based cone-beam CT using a source trajectory of two concentric arcs
Author(s): Joseph Zambelli; Brian E. Nett; Shuai Leng; Cyril Riddell; Barry Belanger; Guang-Hong Chen
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Paper Abstract

The first results from an interventional C-arm based computed tomography system where a complete source trajectory was used are presented. A scan with two arcs which are joined approximately at the center of their paths (CC trajectory) is utilized here. This trajectory satisfies Tuy's sufficiency condition for a large volume, but is not well populated with PI-lines. Therefore, a non-PI-line based reconstruction method is required. The desire for high dose efficiency led to the selection of an equal weighting based method. An FBP type reconstruction algorithm which was derived for two orthogonal concentric circles was utilized for reconstruction. The concept of a virtual image object was used to relate the projections from the two acquired non-orthogonal arcs to projections of a virtual object from two orthogonal arcs. Geometrical calibration is vital when performing tomography from an interventional system, and was incorporated here with the use of a homogeneous virtual projection matrix. The results demonstrate a significant reduction in cone-beam artifacts when the complete source trajectory is utilized.

Paper Details

Date Published: 13 March 2007
PDF: 10 pages
Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65101Q (13 March 2007); doi: 10.1117/12.713813
Show Author Affiliations
Joseph Zambelli, Univ. of Wisconsin-Madison (United States)
Brian E. Nett, Univ. of Wisconsin-Madison (United States)
Shuai Leng, Univ. of Wisconsin-Madison (United States)
Cyril Riddell, GE Healthcare (France)
Barry Belanger, GE Healthcare (United States)
Guang-Hong Chen, Univ. of Wisconsin-Madison (United States)

Published in SPIE Proceedings Vol. 6510:
Medical Imaging 2007: Physics of Medical Imaging
Jiang Hsieh; Michael J. Flynn, Editor(s)

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