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Tensor denoising of multidimensional MRI data.

Authors
  • Olesen, Jonas L1, 2
  • Ianus, Andrada3
  • Østergaard, Leif1
  • Shemesh, Noam3
  • Jespersen, Sune N1, 2
  • 1 Center of Functionally Integrative Neuroscience, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark. , (Denmark)
  • 2 Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark. , (Denmark)
  • 3 Champalimaud Research, Champalimaud Foundation, Lisbon, Portugal. , (Portugal)
Type
Published Article
Journal
Magnetic Resonance in Medicine
Publisher
Wiley (John Wiley & Sons)
Publication Date
Mar 01, 2023
Volume
89
Issue
3
Pages
1160–1172
Identifiers
DOI: 10.1002/mrm.29478
PMID: 36219475
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

To develop a denoising strategy leveraging redundancy in high-dimensional data. The SNR fundamentally limits the information accessible by MRI. This limitation has been addressed by a host of denoising techniques, recently including the so-called MPPCA: principal component analysis of the signal followed by automated rank estimation, exploiting the Marchenko-Pastur distribution of noise singular values. Operating on matrices comprised of data patches, this popular approach objectively identifies noise components and, ideally, allows noise to be removed without introducing artifacts such as image blurring, or nonlocal averaging. The MPPCA rank estimation, however, relies on a large number of noise singular values relative to the number of signal components to avoid such ill effects. This condition is unlikely to be met when data patches and therefore matrices are small, for example due to spatially varying noise. Here, we introduce tensor MPPCA (tMPPCA) for the purpose of denoising multidimensional data, such as from multicontrast acquisitions. Rather than combining dimensions in matrices, tMPPCA uses each dimension of the multidimensional data's inherent tensor-structure to better characterize noise, and to recursively estimate signal components. Relative to matrix-based MPPCA, tMPPCA requires no additional assumptions, and comparing the two in a numerical phantom and a multi-TE diffusion MRI data set, tMPPCA dramatically improves denoising performance. This is particularly true for small data patches, suggesting that tMPPCA can be especially beneficial in such cases. The MPPCA denoising technique can be extended to high-dimensional data with improved performance for smaller patch sizes. © 2022 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine.

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