Rapid compressed sensing reconstruction of 3D non-Cartesian MRI.

ABSTRACT:

Purpose

Conventional non-Cartesian compressed sensing requires multiple nonuniform Fourier transforms every iteration, which is computationally expensive. Accordingly, time-consuming reconstructions have slowed the adoption of undersampled 3D non-Cartesian acquisitions into clinical protocols. In this work we investigate several approaches to minimize reconstruction times without sacrificing accuracy.

Methods

The reconstruction problem can be reformatted to exploit the Toeplitz structure of matrices that are evaluated every iteration, but it requires larger oversampling than what is strictly required by nonuniform Fourier transforms. Accordingly, we investigate relative speeds of the two approaches for various nonuniform Fourier transform kernel sizes and oversampling for bo

SUBMITTER: Baron CA 

PROVIDER: S-EPMC6755916 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature