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Proceedings Paper

Fast imaging method for grating-based x-ray computed tomography
Author(s): Yan Xi; Jun Zhao
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Paper Abstract

Grating-based phase-contrast imaging has been a hot topic for several years owing to its excellent ability to discern lowdensity materials. Compared with commercial X-ray computed tomography (CT) systems, the ‘phase-stepping’ motion in grating-based phase-contrast CT (GPC-CT) takes too long to implement in a CT scan. Additionally, the radiation dose delivered to the sample is several times that delivered by a conventional CT scan. In this paper, we compared four kinds of scanning schemes for GPC-CT and pointed out their advantages and limitations for clinical applications. Following the interlaced phase stepping method, we proposed a novel reconstruction method, namely the inner-focusing reconstruction method. With the proposed method, the gratings can be easily integrated into a conventional CT system implementing phase-contrast imaging with a complete field-of-view. Numerical experiments verified the effectiveness of the proposed method in achieving fast and low-dose GPC-CT.

Paper Details

Date Published: 17 October 2012
PDF: 6 pages
Proc. SPIE 8506, Developments in X-Ray Tomography VIII, 85061P (17 October 2012); doi: 10.1117/12.929447
Show Author Affiliations
Yan Xi, Shanghai Jiao Tong Univ. (China)
Jun Zhao, Shanghai Jiao Tong Univ. (China)

Published in SPIE Proceedings Vol. 8506:
Developments in X-Ray Tomography VIII
Stuart R. Stock, Editor(s)

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