Iterative image reconstruction with random correction for PET studies

Jyh Cheng Chen*, Ren Shyan Liu, Kao Yin Tu, Horng-Shing Lu, Tai Been Chen, Kuo Liang Chou

*此作品的通信作者

研究成果: Conference article同行評審

1 引文 斯高帕斯(Scopus)

摘要

A maximum likelihood-expectation maximization (ML-EM) reconstruction algorithm has been developed that allows random coincidence correction for the phantom we used and the reconstructed images are better than those obtained by convolution backprojection (CBP) for positron emission tomography (PET) studies in terms of spatial resolution, image artifacts and noise. With our algorithm reconstruct the true coincidence events and random coincidence events were reconstructed separately. We also calculated the random ratio from the measured projection data (singles) using line and cylindrical phantoms, respectively. From cylindrical phantom experiments, the random event ratio was 41.8% to 49.1% in each ring. These results are close to the ratios obtained from geometric calculation, which range from 45.0% to 49.5%. The random ratios and the patterns of random events provide insightful information for random correction. This information is particularly valuable when the delay window correction is not available as in the case of our PET system.

原文English
頁(從 - 到)1218-1229
頁數12
期刊Proceedings of SPIE - The International Society for Optical Engineering
3979
DOIs
出版狀態Published - 12 2月 2000
事件Medical Imaging 2000: Image Processing - San Diego, CA, USA
持續時間: 14 2月 200017 2月 2000

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