OS-EM Reconstruction for X-ray CT

Author

Baoyu, Dong

Author_Institution

Dalian Jiaotong Univ., Dalian

fYear

2007

Abstract

Computed tomography (CT) is one of the advanced means for non-destructive testing (NDT), which has the virtues of non-destructive, non-contact and high resolution. It is called the best means for NDT by the circle of international NDT. It has been widely applied in diagnostic medicine and industrial non-destructive testing. X-ray CT (XCT) is the most popular CT. Compared with other parts of CT system, reconstruction algorithm is an important part. In this paper, the theory of maximum likelihood estimation is applied to XCT, and ordered subsets expectation maximization (OS-EM) algorithm is studied and implemented. OS-EM algorithm is a feasible iterative method. It can provide good quality reconstructions after only a few iterations. Experiments results with real X-ray CT data show this method is effective. Reconstructed slice images of OS-EM algorithm are accurate and clear.

Keywords

computerised tomography; expectation-maximisation algorithm; OS-EM reconstruction; X-ray computed tomography; diagnostic medicine; high resolution; maximum likelihood estimation; non contact; nondestructive testing; ordered subsets expectation maximization; Biomedical imaging; Computed tomography; Image reconstruction; Iterative algorithms; Maximum likelihood estimation; Medical diagnostic imaging; Medical tests; Nondestructive testing; Reconstruction algorithms; X-ray imaging; EM algorithm; Maximum likelihood estimation; Ordered subsets; Reconstruction; X-ray CT;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronic Measurement and Instruments, 2007. ICEMI '07. 8th International Conference on

Conference_Location

Xi´an

Print_ISBN

978-1-4244-1136-8

Electronic_ISBN

978-1-4244-1136-8

Type

conf

DOI

10.1109/ICEMI.2007.4351207

Filename

4351207