A half-scan error reduction based algorithm for cone-beam CT

Article type: Research Article

Authors: Zeng, Kai | Chen, Zhiqiang | Zhang, Li | Wang, Ge^;

Affiliations: Department of Engineering Physics, Tsinghua University, Beijing, 100084, China. E-mail: zengkai@tsinghua.org.cn, zhangli@nuctech.com, czq@mail.tsinghua.edu.cn | Departments of Radiology, University of Iowa, Iowa City, IA 52242, USA. E-mail: ge-wang@uiowa.edu

Abstract: The most popular Feldkamp algorithm for cone-beam image reconstruction assumes a scanning circle, and performs well only with a small cone angle. In this report, we propose a Feldkamp-type algorithm to increase the cone angle by several folds at a radiation dose comparable to that required by the classic Feldkamp algorithm. In our scheme, two half-scans of different radii are used. Then, approximate reconstructions from two half-scans are combined to produce a superior image volume by utilizing a relationship between the half-scan reconstruction error and the scanning locus radius. The merit of this half-scan error reduction based (HERB) algorithm is demonstrated in numerical simulation with the 3D Shepp-Logan phantom.

Journal: Journal of X-Ray Science and Technology, vol. 12, no. 2, pp. 73-82, 2004