Title :
OS-EM Reconstruction for X-ray CT
Author_Institution :
Dalian Jiaotong Univ., Dalian
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;
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
DOI :
10.1109/ICEMI.2007.4351207
