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Cited by 3,711

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Accelerated image reconstruction using ordered subsets of projection data

Hudson, H.M., Larkin, R.S.·1994·IEEE Transactions on Medical Imaging

Abstract

The authors define ordered subset processing for standard algorithms (such as expectation maximization, EM) for image restoration from projections. Ordered subsets methods group projection data into an ordered sequence of subsets (or blocks). An iteration of ordered subsets EM is defined as a single pass through all the subsets, in each subset using the current estimate to initialize application of EM with that data subset. This approach is similar in concept to block-Kaczmarz methods introduced by Eggermont et al. (1981) for iterative reconstruction. Simultaneous iterative reconstruction (SIRT) and multiplicative algebraic reconstruction (MART) techniques are well known special cases. Ordered subsets EM (OS-EM) provides a restoration imposing a natural positivity condition and with close links to the EM algorithm. OS-EM is applicable in both single photon (SPECT) and positron emission tomography (PET). In simulation studies in SPECT, the OS-EM algorithm provides an order-of-magnitude acceleration over EM, with restoration quality maintained.

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Metadata

Authors
Hudson, H. M., & Larkin, R. S.
Venue
IEEE Transactions on Medical Imaging
Published
1994
Volume
13
Issue
4
Pages
601-609
ISSN
0278-0062 (ISSN-L)
OpenAlex
W2154744699
Cited by
3,711
References
2
FWCI
20.79
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Accelerated image reconstruction using ordered subsets of projection data. https://app.cochat.ai/papers/10.1109/42.363108
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Hudson, H. M., & Larkin, R. S. (1994). Accelerated image reconstruction using ordered subsets of projection data. IEEE Transactions on Medical Imaging. https://doi.org/10.1109/42.363108

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