A stationary computed tomography system with cylindrically distributed sources and detectors

作者：Chen, Yi; Xi, Yan; Zhao, Jun^*

来源：Journal of X-Ray Science and Technology, 2014, 22(6): 707-725.

DOI：10.3233/XST-140456

• Stationary CT
• distributed X-ray sources
• temporal resolution
• Katsevich-type algorithm
• dynamic imaging

BACKGROUND: The temporal resolution of current computed tomography (CT) systems is limited by the rotation speed of their gantries. @@@ OBJECTIVE: A helical interlaced source detector array (HISDA) CT, which is a stationary CT system with distributed X-ray sources and detectors, is presented in this paper to overcome the aforementioned limitation and achieve high temporal resolution. @@@ METHODS: Projection data can be obtained from different angles in a short time and do not require source, detector, or object motion. Axial coverage speed is increased further by employing a parallel scan scheme. Interpolation is employed to approximate the missing data in the gaps, and then a Katsevich-type reconstruction algorithm is applied to enable an approximate reconstruction. @@@ RESULTS: The proposed algorithm suppressed the cone beam and gap-induced artifacts in HISDA CT. The results also suggest that gap-induced artifacts can be reduced by employing a large helical pitch for a fixed gap height. @@@ CONCLUSIONS: HISDA CT is a promising 3D dynamic imaging architecture given its good temporal resolution and stationary advantage.

• 出版日期2014
• 单位上海交通大学