Abstract

Purpose
To mitigate a common artifact in spiral real‐time MRI, caused by aliasing of signal outside the desired FOV. This artifact frequently occurs in midsagittal speech real‐time MRI.
Methods
Simulations were performed to determine the likely origin of the artifact. Two methods to mitigate the artifact are proposed. The first approach, denoted as “large FOV” (LF), keeps an FOV that is large enough to include the artifact signal source during reconstruction. The second approach, denoted as “estimation‐subtraction” (ES), estimates the artifact signal source before subtracting a synthetic signal representing that source in multicoil k‐space raw data. Twenty‐five midsagittal speech‐production real‐time MRI data sets were used to evaluate both of the proposed methods. Reconstructions without and with corrections were evaluated by two expert readers using a 5‐level Likert scale assessing artifact severity …

Date

2021

Authors

Ye Tian, Yongwan Lim, Ziwei Zhao, Dani Byrd, Shrikanth Narayanan, Krishna S Nayak

Journal

Magnetic resonance in medicine

Volume

86

Issue

2

Pages

916-925