Joint B0 and image estimation integrated with model based reconstruction for field map update and distortion correction in prostate diffusion MRI.

ABSTRACT: In prostate Diffusion Weighted MRI, differences in susceptibility values exist at the interface between the prostate and rectal-air. This can result in off-resonance magnetic field leading to geometric distortions including signal stretching and signal pile-up in the reconstructed images. Using a set of EPI data acquired with blip-up and blip-down phase encoding gradient directions, model based reconstruction has recently been proposed that can correct these distortions by using a B0 field estimated from a separate B0 scan. However, change in the size of the rectal air region across time can occur that can result in a mismatch of the B0 field to the EPI scan. Also, the measured B0 field itself can be erroneous in regions of low Signal to Noise ratio around the prostate rectal air interface

SUBMITTER: Usman M 

PROVIDER: S-EPMC6837878 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature