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Proceedings Paper

Accurate image reconstruction of a small ROI using fully truncated data in differential phase contrast computed tomography
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Paper Abstract

Differential phase contrast computed tomography (DPC-CT) is a novel X-ray imaging method that uses the wave properties of imaging photons as the contrast mechanism. It has been demonstrated that differential phase contrast images can be obtained using either synchrotron radiation or a conventional X-ray tube and a Talbot- Lau-type interferometer. These data acquisition systems offer only a limited field of view and thus, are prone to data truncation. In this work, we demonstrated that a small region of interest (ROI) of a large object can be accurately and stably reconstructed using fully truncated projection datasets provided that a priori information on electron density is known inside the ROI. The method reconstructs an image iteratively to satisfy a group of physical conditions using a projection onto convex set (POCS) algorithm. This POCS algorithm is validated using numerical simulations.

Paper Details

Date Published: 22 March 2010
PDF: 8 pages
Proc. SPIE 7622, Medical Imaging 2010: Physics of Medical Imaging, 76221U (22 March 2010); doi: 10.1117/12.844563
Show Author Affiliations
Pascal Thériault Lauzier, Univ. of Wisconsin-Madison (United States)
Zhihua Qi, Univ. of Wisconsin-Madison (United States)
Joseph Zambelli, Univ. of Wisconsin-Madison (United States)
Nicholas Bevins, Univ. of Wisconsin-Madison (United States)
Guang-Hong Chen, Univ. of Wisconsin-Madison (United States)

Published in SPIE Proceedings Vol. 7622:
Medical Imaging 2010: Physics of Medical Imaging
Ehsan Samei; Norbert J. Pelc, Editor(s)

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