Respiration artifact correction in three-dimensional proton resonance frequency MR thermometry using phase navigators.

ABSTRACT:

Purpose

To develop reliable three-dimensional (3D) segmented echo planar imaging (seg-EPI) proton resonance frequency (PRF) temperature monitoring in the presence of respiration-induced B0 variation.

Methods

A free induction decay (FID) phase navigator was inserted into a 3D seg-EPI sequence before and after EPI readout to monitor B0 field variations. Using the field change estimates, the phase of each k-space line was adjusted to remove the additional phase from the respiratory induced off-resonance. This correction technique was evaluated while heating with MR-guided focused ultrasound (MRgFUS) in phantoms with simulated breathing and during nonheating conditions in healthy in vivo breasts.

Results

With k-space phase correction, the standard deviation of magnitude i

SUBMITTER: Svedin BT 

PROVIDER: S-EPMC4752934 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature