High-Dimensional Confidence Regions in Sparse MRI

Frederik Hoppe, Felix Krahmer, Claudio Mayrink Verdun, Marion I. Menzel, Holger Rauhut

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

One of the most promising solutions for uncertainty quantification in high-dimensional statistics is the debiased LASSO that relies on unconstrained ℓ1-minimization. The initial works focused on real Gaussian designs as a toy model for this problem. However, in medical imaging applications, such as compressive sensing for MRI, the measurement system is represented by a (subsampled) complex Fourier matrix. The purpose of this work is to extend the method to the MRI case in order to construct confidence intervals for each pixel of an MR image. We show that a sufficient amount of data is n ≳ max {s0 log 2 s0 log p, s0 log 2 p}.

Keywords

  • MRI
  • compressed sensing
  • confidence regions
  • debiased LASSO

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