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Diffusion MRI noise mapping using random matrix theory

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Veraart, Jelle, Fieremans, Els, Novikov, Dmitry S.·2016·Magnetic Resonance in Medicine

Abstract

Purpose: To estimate the spatially varying noise map using a redundant series of magnitude MR images. Methods: We exploit redundancy in non‐Gaussian distributed multidirectional diffusion MRI data by identifying its noise‐only principal components, based on the theory of noisy covariance matrices. The bulk of principal component analysis eigenvalues, arising due to noise, is described by the universal Marchenko–Pastur distribution, parameterized by the noise level. This allows us to estimate noise level in a local neighborhood based on the singular value decomposition of a matrix combining neighborhood voxels and diffusion directions. Results: We present a model‐independent local noise mapping method capable of estimating the noise level down to about 1% error. In contrast to current state‐of‐the‐art techniques, the resultant noise maps do not show artifactual anatomical features that often reflect physiological noise, the presence of sharp edges, or a lack of adequate a priori knowledge of the expected form of MR signal. Conclusions: Simulations and experiments show that typical diffusion MRI data exhibit sufficient redundancy that enables accurate, precise, and robust estimation of the local noise level by interpreting the principal component analysis eigenspectrum in terms of the Marchenko–Pastur distribution. Magn Reson Med 76:1582–1593, 2016. © 2015 International Society for Magnetic Resonance in Medicine

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Metadata

Authors
Veraart, J., Fieremans, E., & Novikov, D. S.
Venue
Magnetic Resonance in Medicine
Publisher
Wiley
Published
2015-11-24
Volume
76
Issue
5
Pages
1582-1593
ISSN
  • 0740-3194 (ISSN-L)
  • 1522-2594
OpenAlex
W2177917702
Cited by
773
References
43
FWCI
16.46
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Diffusion MRI noise mapping using random matrix theory. https://app.cochat.ai/papers/10.1002/mrm.26059
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Veraart, J., Fieremans, E., & Novikov, D. S. (2016). Diffusion MRI noise mapping using random matrix theory. Magnetic Resonance in Medicine. https://doi.org/10.1002/mrm.26059

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