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  Robust Estimation of Spatially Variable Noise Field

Landman, B. A., Bazin, P.-L., Smith, S. A., & Prince, J. L. (2009). Robust Estimation of Spatially Variable Noise Field. Magnetic Resonance in Medicine, 62(2), 500-509. doi:10.1002/mrm.22013.

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 Creators:
Landman, Bennett A.1, Author
Bazin, Pierre-Louis1, Author           
Smith, Seth A.1, Author
Prince, Jerry L. 1, Author
Affiliations:
1External Organizations, ou_persistent22              

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Free keywords: spatially variable noise fields; MRI; robust estimation; diffusion tensor imaging; relaxometry
 Abstract: Consideration of spatially variable noise fields is becoming increasingly necessary in MRI given recent innovations in artifact identification and statistically driven image processing. Fast imaging methods enable study of difficult anatomical targets and improve image quality but also increase the spatial variability in the noise field. Traditional analysis techniques have either assumed that the noise is constant across the field of view (or region of interest) or have relied on separate MRI acquisitions to measure the noise field. These methods are either inappropriate for many modern scanning protocols or are overly time‐consuming for already lengthy scanning sessions. We propose a new, general framework for estimating spatially variable noise fields from related, but independent MR scans that we call noise field equivalent scans. These heuristic analyses enable robust noise field estimation in the presence of artifacts. Generalization of noise estimators based on uniform regions, difference images, and maximum likelihood are presented and compared with the estimators derived from the proposed framework. Simulations of diffusion tensor imaging and T2‐relaxometry demonstrate a 10‐fold reduction in mean squared error in noise field estimation, and these improvements are shown to be robust to artifact contamination. In vivo studies show that spatially variable noise fields can be readily estimated with typical data acquired at 1.5T. Magn Reson Med, 2009.

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Language(s): eng - English
 Dates: 2009-01-142008-02-012009-02-182009-06-122009-08
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/mrm.22013
PMID: 19526510
PMC: PMC2806192
 Degree: -

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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Publ. Info: New York : Wiley-Liss
Pages: - Volume / Issue: 62 (2) Sequence Number: - Start / End Page: 500 - 509 Identifier: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149