A stationary computed tomography system with cylindrically distributed sources and detectors

Article type: Research Article

Authors: Chen, Yi | Xi, Yan | Zhao, Jun

Affiliations: School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China

Note: [] Corresponding author: Jun Zhao, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. Tel.: +86 136 2170 6907; E-mail: [email protected]

Abstract: 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.

Keywords: Stationary CT, distributed X-ray sources, temporal resolution, Katsevich-type algorithm, dynamic imaging

DOI: 10.3233/XST-140456

Journal: Journal of X-Ray Science and Technology, vol. 22, no. 6, pp. 707-725, 2014