B₀ concomitant field compensation for MRI systems employing asymmetric transverse gradient coils.

ABSTRACT:

Purpose

Imaging gradients result in the generation of concomitant fields, or Maxwell fields, which are of increasing importance at higher gradient amplitudes. These time-varying fields cause additional phase accumulation, which must be compensated for to avoid image artifacts. In the case of gradient systems employing symmetric design, the concomitant fields are well described with second-order spatial variation. Gradient systems employing asymmetric design additionally generate concomitant fields with global (zeroth-order or B₀ ) and linear (first-order) spatial dependence.

Methods

This work demonstrates a general solution to eliminate the zeroth-order concomitant field by applying the correct B₀ frequency shift in real time to counteract the concomita

SUBMITTER: Weavers PT 

PROVIDER: S-EPMC5740018 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature