BPF-based Reconstruction Algorithm for Multiple Rotation-translation Scan Mode*

M. Chen1, H. Zhang1, Y. Sun2 and P. Zhang1

1Computer Tomography Laboratory, Capital Normal University, Beijing 100037, China

2 Shandong College of Electronic Technology, Shandong 250014 China Email: pzhang@mail.cnu.edu.cn

ABSTRACT

In industrial CT, it is often required to inspect large objects using short line-detectors. To acquire the complete CT data for the scanning slice of large objects using short line-detectors, some multi-scan modes have been developed. But the existing methods reconstructing an image from the data scanned by multi-scan modes have to rebin the data into fan-beam or parallel-beam form via data interpolation. The data rebinning process not only increases great computational cost, but also degrades image resolution. In this paper, we propose a backprojection-filtration (BPF)-based reconstruction algorithm for rotation-translation (RT) multi-scan mode. An important feature of the proposed algorithm is that data rebinning process is not introduced. The numerical experiment results have verified the validity of the proposed algorithm.

Keywords backprojection-filtration (BPF), reconstruction algorithm, multiple rotation-translation scan mode, fan-beam