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Proceedings Paper

Imaging properties of circular and helical interlaced source-detector CT
Author(s): Yi Chen; Yan Xi; Jun Zhao
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Paper Abstract

We study reconstruction methods and imaging properties of the circular and helical interlaced source-detector array (ISDA) computed tomography (CT) system. The system uses carbon nanotube (CNT) based field emission X-ray source arrays and detector arrays. Distributed sources and detectors allow projection data been acquired from different direction by switching on the X-ray sources sequentially, requiring no rotation of gantry or object. Thus the system enables high temporal resolution and eliminates motion artifacts caused by gantry rotation as is common in the conventional CT systems. Interpolation is implemented to patch the absent data in the projection image, and tilted plane Feldkamp type reconstruction algorithm (TPFR) is used to reduce the cone beam artifacts for helical ISDA CT. We analyze the distribution of artifacts in the reconstruction, as well as the influence of the detector array gap and the helix pitch on reconstruction quality. Simulation studies demonstrate that the gap ratio is the key factor on the artifacts due to the gap, and increasing the pitch will reduced gap ratio. Choosing the helix pitch appropriately by getting a balance between cone beam artifacts and gap induced artifacts can get a better reconstruction.

Paper Details

Date Published: 17 October 2012
PDF: 11 pages
Proc. SPIE 8506, Developments in X-Ray Tomography VIII, 85061Q (17 October 2012); doi: 10.1117/12.929556
Show Author Affiliations
Yi Chen, Shanghai Jiao Tong Univ. (China)
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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