Accelerated three-dimensional multispectral MRI with robust principal component analysis for separation of on- and off-resonance signals.

ABSTRACT:

Purpose

To enable highly accelerated distortion-free MRI near metal by separating on- and off-resonance to exploit the redundancy of slice-phase encoding for the dominant on-resonance component.

Methods

Multispectral MRI techniques resolve off-resonance distortions by a combination of limited excitation bins and additional encoding. Inspired by robust principal component analysis, a novel compact representation of multispectral images as a sum of rank-one and sparse matrices corresponding to on- and off-resonance respectively is described. This representation is used in a calibration-free and model-free reconstruction for data with an undersampling pattern that varies between bins. Retrospective undersampling was used to compare the proposed reconstruction and bin-by-bin com

SUBMITTER: Levine E 

PROVIDER: S-EPMC5756705 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature