Maxwell-compensated design of asymmetric gradient waveforms for tensor-valued diffusion encoding.

ABSTRACT:

Purpose

Diffusion encoding with asymmetric gradient waveforms is appealing because the asymmetry provides superior efficiency. However, concomitant gradients may cause a residual gradient moment at the end of the waveform, which can cause significant signal error and image artifacts. The purpose of this study was to develop an asymmetric waveform designs for tensor-valued diffusion encoding that is not sensitive to concomitant gradients.

Methods

The "Maxwell index" was proposed as a scalar invariant to capture the effect of concomitant gradients. Optimization of "Maxwell-compensated" waveforms was performed in which this index was constrained. Resulting waveforms were compared to waveforms from literature, in terms of the measured and predicted impact of concomitant gradient

SUBMITTER: Szczepankiewicz F 

PROVIDER: S-EPMC6626569 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature