A novel method to reduce data acquisition time in differential phase contrast: computed tomography using compressed sensing

Zhihua Qi; Joseph Zambelli; Nicholas Bevins; Guang-Hong Chen

doi:10.1117/12.813861

13 March 2009 A novel method to reduce data acquisition time in differential phase contrast: computed tomography using compressed sensing

Zhihua Qi, Joseph Zambelli, Nicholas Bevins, Guang-Hong Chen

Author Affiliations +

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72584A (2009) https://doi.org/10.1117/12.813861
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

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.

Citation Download Citation

Zhihua Qi, Joseph Zambelli, Nicholas Bevins, and Guang-Hong Chen "A novel method to reduce data acquisition time in differential phase contrast: computed tomography using compressed sensing", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72584A (13 March 2009); https://doi.org/10.1117/12.813861

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