Reduction of noise amplification in SPECT using smaller detector bin size

DoSik Hwang, Gengsheng L. Zeng

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In SPECT iterative reconstruction methods, such as the ML-EM (Maximum Likelihood Expectation Maximization) algorithm, the noise propagation from the projection measurements into the reconstructed image has been a difficult problem to control as the algorithm iterates. In this paper, we show that the noise amplification at high number of iterations can be reduced by using a detector whose bin size is smaller than the image pixel size without applying any regularization methods or changing any other factors. We compare different detector system characteristics using SVD (Singular Value Decomposition) analysis, show the noise properties in each detector system through both simulation studies and physical phantom studies, and finally compare how the noise amplification affects the image quality in different detector systems. The ML-EM algorithm when used in conjunction with a smaller detector bin size has better convergent properties and reduces noise amplification at high number of iterations.

Original languageEnglish
Pages (from-to)1417-1427
Number of pages11
JournalIEEE Transactions on Nuclear Science
Volume52
Issue number5 I
DOIs
Publication statusPublished - 2005 Oct 1

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Bins
Amplification
Detectors
detectors
Maximum likelihood
iteration
noise propagation
Singular value decomposition
Image quality
projection
Pixels
pixels
decomposition
simulation

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Nuclear Energy and Engineering

Cite this

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abstract = "In SPECT iterative reconstruction methods, such as the ML-EM (Maximum Likelihood Expectation Maximization) algorithm, the noise propagation from the projection measurements into the reconstructed image has been a difficult problem to control as the algorithm iterates. In this paper, we show that the noise amplification at high number of iterations can be reduced by using a detector whose bin size is smaller than the image pixel size without applying any regularization methods or changing any other factors. We compare different detector system characteristics using SVD (Singular Value Decomposition) analysis, show the noise properties in each detector system through both simulation studies and physical phantom studies, and finally compare how the noise amplification affects the image quality in different detector systems. The ML-EM algorithm when used in conjunction with a smaller detector bin size has better convergent properties and reduces noise amplification at high number of iterations.",
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Reduction of noise amplification in SPECT using smaller detector bin size. / Hwang, DoSik; Zeng, Gengsheng L.

In: IEEE Transactions on Nuclear Science, Vol. 52, No. 5 I, 01.10.2005, p. 1417-1427.

Research output: Contribution to journalArticle

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