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Proceedings Paper

Random-coincidence corrections using iterative reconstruction for PET images
Author(s): Jyh-Cheng Chen; Ren-Shyan Liu; Kao-Yin Tu; Henry Horng-Shing Lu; Tai-Been Chen; Kuo Liang Chou
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Paper Abstract

Iterative reconstruction (IR) algorithms can reduce artifacts caused by filtered backprojection (FBP) or convolution backprojection (CBP). Recently, the computational effects required for IR of positron emission tomography (PET) studies have been reduced to make it practically appealing. We have made an implementation of the improved maximum likelihood-expectation maximization (ML-EM) algorithm. The transition matrix was generated based on the geometry of the instrument. Phantoms of 6 line sources and 19 line sources were used to test our accelerated ML-EM algorithms against the FBP method. The singles were used to calculate the random coincidence rates by a well known formula and were compared to the randoms obtained by another geometric method. We also designed a new model using two line sources to determine the ratio of random events to true events. The artifacts near those line sources were eliminated with the ML-EM method. With decay correction, the RC events were uniformity distributed in whole field after 10 iterations. The ML-EM reconstructed images are superior to those obtained with FBP. The patterns of randoms provide insightful information for random correction, which the hardware correction by the delay window can not provide. This information is particularly valuable when the delay window correction is not available in the old fashion PET scanner.

Paper Details

Date Published: 18 December 2000
PDF: 12 pages
Proc. SPIE 4142, Penetrating Radiation Systems and Applications II, (18 December 2000); doi: 10.1117/12.410572
Show Author Affiliations
Jyh-Cheng Chen, National Yang-Ming Univ. (Taiwan)
Ren-Shyan Liu, Taipei Veterans General Hospital (Taiwan)
Kao-Yin Tu, National Yang-Ming Univ. (Taiwan)
Henry Horng-Shing Lu, National Chiao Tung Univ. (Taiwan)
Tai-Been Chen, National Chiao Tung Univ. (Taiwan)
Kuo Liang Chou, Taipei Veterans General Hospital (Taiwan)


Published in SPIE Proceedings Vol. 4142:
Penetrating Radiation Systems and Applications II
F. Patrick Doty; H. Bradford Barber; Hans Roehrig; Edward J. Morton, Editor(s)

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