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Optical Engineering

Unmatched projector/backprojector pair for demultiplexing in multipinhole emission computed tomography
Author(s): Byung Jun Min; Yong Choi; Nam-Yong Lee; Jin Ho Jung; Key Jo Hong; Ji Hoon Kang; Wei Hu; Kisung Lee; Young Bok Ahn; Jinhun Joung
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Paper 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.

Paper Details

Date Published: 1 December 2010
PDF: 9 pages
Opt. Eng. 49(12) 127004 doi: 10.1117/1.3518081
Published in: Optical Engineering Volume 49, Issue 12
Show Author Affiliations
Byung Jun Min, Sogang Univ. (Korea, Republic of)
Yong Choi, Sogang Univ. (Korea, Republic of)
Nam-Yong Lee, Inje Univ. (Korea, Republic of)
Jin Ho Jung, Sogang Univ. (Korea, Republic of)
Key Jo Hong, Sogang Univ. (Korea, Republic of)
Ji Hoon Kang, Sogang Univ. (Korea, Republic of)
Wei Hu, Sogang Univ. (Korea, Republic of)
Kisung Lee, Korea Univ. (Korea, Republic of)
Young Bok Ahn, Konkuk Univ. (Korea, Republic of)
Jinhun Joung, Korea Univ. (Korea, Republic of)

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