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Proceedings Paper

A novel method to reduce data acquisition time in differential phase contrast: computed tomography using compressed sensing
Author(s): Zhihua Qi; Joseph Zambelli; Nicholas Bevins; Guang-Hong Chen
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Paper Abstract

Recently, differential phase contrast computed tomography (DPC-CT) imaging methods have been successfully implemented using either synchrotron or x-ray tube generated x-rays. As far as image reconstruction is concerned, FBPtype reconstruction algorithms have been proposed. However, due to the intrinsic low photon efficiency of the system and the sampling requirement of the FBP reconstruction algorithms, the x-ray exposure time is unacceptably long, on the order of hours. In order to significantly shorten the data acquisition time, we proposed to acquire projection data at significantly fewer view angles. This poses a challenge in image reconstruction. In this work, we aimed at using the newly developed compressed sensing (CS) image reconstruction method to accurately reconstruct phase contrast CT images from vastly under-sampled data. Experimental data were utilized to validate our new reconstruction method. Our results demonstrate that the CS method enables acceptable image reconstruction in DPC-CT using significantly fewer view angles when compared with the FBP image reconstruction method.

Paper Details

Date Published: 13 March 2009
PDF: 8 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72584A (13 March 2009); doi: 10.1117/12.813861
Show Author Affiliations
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. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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