Weighted expectation maximization reconstruction algorithms with application to gated megavoltage tomography Journal Article
| Authors: | Zhang, J.; Shi, D.; Anastasio, M. A.; Sillanpaa, J.; Chang, J. |
| Article Title: | Weighted expectation maximization reconstruction algorithms with application to gated megavoltage tomography |
| Abstract: | We propose and investigate weighted expectation maximization (EM) algorithms for image reconstruction in x-ray tomography. The development of the algorithms is motivated by the respiratory-gated megavoltage tomography problem, in which the acquired asymmetric cone-beam projections are limited in number and unevenly sampled over view angle. In these cases, images reconstructed by use of the conventional EM algorithm can contain ring- and streak-like artefacts that are attributable to a combination of data inconsistencies and truncation of the projection data. By use of computer-simulated and clinical gated fan-beam megavoltage projection data, we demonstrate that the proposed weighted EM algorithms effectively mitigate such image artefacts. © 2005 IOP Publishing Ltd. |
| Keywords: | algorithms; algorithm; tomography; models, statistical; pattern recognition, automated; computer simulation; problem solving; phantoms, imaging; image processing, computer-assisted; software; artifacts; image reconstruction; radiographic image interpretation, computer-assisted; optimization; x ray analysis; megavoltage radiation; voltage control; cone-beams; respiratory-gated megavoltage tomography; weighted expectation maximization; x-ray tomography; tomography, x-ray |
| Journal Title: | Physics in Medicine and Biology |
| Volume: | 50 |
| Issue: | 21 |
| ISSN: | 0031-9155 |
| Publisher: | IOP Publishing Ltd |
| Date Published: | 2005-11-07 |
| Start Page: | N299 |
| End Page: | N307 |
| Language: | English |
| DOI: | 10.1088/0031-9155/50/21/n02 |
| PUBMED: | 16237229 |
| PROVIDER: | scopus |
| DOI/URL: | |
| Notes: | --- - "Cited By (since 1996): 4" - "Export Date: 24 October 2012" - "CODEN: PHMBA" - "Source: Scopus" |
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