Meeting Banner
Abstract #0665

Accounting for B0 field-inhomogeneity-gradient induced dephasing in Cartesian and in time-resolved sequences.

Gilad Liberman1 and Kawin Setsompop1
1Department of Radiology, Massachusetts General Hospital, Charlestown, MA, United States

The spatial derivative of the field inhomogeneity acts as a gradient, inducing growing intravoxel dephasing along the acquisition time, resulting in blurring, void regions (“signal loss”) and artifacts. We tackle this issue through modelling and through Cartesian time-segmentation. We show that under typical settings, field inhomogeneity gradients cause significant artifact both through-plane and in-plane, and that these artifacts can be greatly mitigated with improved reconstruction at minimal computational cost. We formalize the description of the effects of these additional gradients in k-t space in temporal units, allowing for quick apprehension of the consequences to trajectory design and reconstruction approach.

This abstract and the presentation materials are available to 2020 meeting attendees and eLibrary customers only; a login is required.

Join Here