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Unmatched projector/backprojector pair for demultiplexing in multipinhole emission computed tomography

Authors
Min, Byung JunChoi, YongLee, Nam-YongJung, Jin HoHong, Key JoKang, Ji HoonHu, WeiLee, KisungAhn, Young BokJoung, Jinhun
Issue Date
Dec-2010
Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
Keywords
multipinhole collimator; demultiplexing; system matrix; maximum likelihood-expectation maximization; image reconstruction; tomography
Citation
OPTICAL ENGINEERING, v.49, no.12
Indexed
SCIE
SCOPUS
Journal Title
OPTICAL ENGINEERING
Volume
49
Number
12
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/115191
DOI
10.1117/1.3518081
ISSN
0091-3286
Abstract
Statistically based iterative algorithms such as maximum likelihood-expectation maximization (ML-EM) are used for image reconstruction in single photon emission computed tomography (SPECT). Unmatched projector/backprojector pairs are sometimes used to accelerate the iteration process in the reconstruction algorithm. In this work, we propose and explore the use of an unmatched projector/backprojector pair for demultiplexing in multipinhole SPECT. Several simulations are conducted to evaluate the performance of the proposed method with uniform, hot-rod, and cold-rod phantoms. The proposed method incorporates an unmatched backprojector to utilize selective multiplexed projection data in reconstruction algorithms, while the projector is modeled as accurately as possible to represent realistic imaging geometry and the physical effects of multipinhole SPECT. The root mean square (rms) error and backprojection speed are evaluated to determine an unmatched backprojector. Our results demonstrate that the proposed method provides high-quality multipinhole SPECT images without multiplexing-related artifacts when a well-chosen unmatched backprojector is used. (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3518081]
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