Dynamic off-resonance correction for spiral real-time MRI of speech.

ABSTRACT:

Purpose

To improve the depiction and tracking of vocal tract articulators in spiral real-time MRI (RT-MRI) of speech production by estimating and correcting for dynamic changes in off-resonance.

Methods

The proposed method computes a dynamic field map from the phase of single-TE dynamic images after a coil phase compensation where complex coil sensitivity maps are estimated from the single-TE dynamic scan itself. This method is tested using simulations and in vivo data. The depiction of air-tissue boundaries is evaluated quantitatively using a sharpness metric and visual inspection.

Results

Simulations demonstrate that the proposed method provides robust off-resonance correction for spiral readout durations up to 5 ms at 1.5T. In -vivo experiments during human speech

SUBMITTER: Lim Y 

PROVIDER: S-EPMC6258270 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature