Meeting Banner
Abstract #3776

Closed-Form Solution Concomitant Field Correction Method for Echo Planar Imaging on Head-only Asymmetric Gradient MRI System

Shengzhen Tao 1 , Joshua D Trzasko 1 , Yunhong Shu 1 , Paul T Weavers 1 , Seung-Kyun Lee 2 , and Matt A Bernstein 1

1 Radiology, Mayo Clinic, Rochester, MN, United States, 2 GE Global Research, Niskayuna, NY, United States

The spatial encoding gradient field used in MRI always includes spatially-varying higher order fields known as concomitant fields. Different from conventional gradient systems whose concomitant fields only contain 2nd-order spatial dependency, some emerging MRI platforms employ asymmetric gradient system, whose concomitant fields also include zero- and first-order spatial dependencies. The first-order terms cause further image distortion and echo shift in echo planar imaging (EPI). In this work, we develop a generalized waveform pre-emphasis framework to correct first-order concomitant fields for arbitrary axial-coronal oblique EPI acquisitions on a head-only asymmetric gradient system, and provide closed-form mathematical expressions for determining pre-emphasis factors.

This abstract and the presentation materials are available to members only; a login is required.

Join Here