Fast imaging method for grating-based x-ray computed tomography

Yan Xi; Jun Zhao

doi:10.1117/12.929447

17 October 2012 Fast imaging method for grating-based x-ray computed tomography

Yan Xi, Jun Zhao

Proceedings Volume 8506, Developments in X-Ray Tomography VIII; 85061P (2012) https://doi.org/10.1117/12.929447
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

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.

Citation Download Citation

Yan Xi and Jun Zhao "Fast imaging method for grating-based x-ray computed tomography", Proc. SPIE 8506, Developments in X-Ray Tomography VIII, 85061P (17 October 2012); https://doi.org/10.1117/12.929447

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