On-line Iterative Image Reconstruction for ECT

Shi Liu1, Li Fu2, Wuqiang Yang3, Haigang Wang1, Fan Jiang1

1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, PO Box 2706, Beijing 100080, China, s.liu@mail.etp.ac.cn

2. Faculty of Software Engineering, Chongqing University, Chongqing 400044, China

3. Dept. of Electrical Engineering and Electronics, UMIST, PO Box 88, Manchester M60 1QD, UK

ABSTRACT

This paper describes a new iterative scheme for ECT, which can reconstruct images of the same quality as the Landweber iteration, while maintaining the same image reconstruction speed as the LBP method. An optimised step length function has been incorporated into the new scheme, so that the step length is dynamically adjusted in each step. With an optimised step length, the number of iterations can be reduced and divergence prevented. The scheme has been evaluated by experiment and good results were obtained.

Keywords ECT, Image reconstruction, Iterative algorithm, Optimisation