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

Yongwan Lim; Sajan Goud Lingala; Shrikanth S Narayanan; Krishna S Nayak

doi:10.1002/mrm.27373

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

Journal article

Open access

Peer reviewed

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

Yongwan Lim, Sajan Goud Lingala, Shrikanth S Narayanan and Krishna S Nayak

Magnetic resonance in medicine, Vol.81(1), pp.234-246

01/2019

DOI: 10.1002/mrm.27373

PMCID: PMC6258270

PMID: 30058147

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Abstract

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. 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. 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 production demonstrate that image sharpness is improved in a majority of data sets at air-tissue boundaries including the upper lip, hard palate, soft palate, and tongue boundaries, whereas the lower lip shows little improvement in the edge sharpness after correction. Dynamic off-resonance correction is feasible from single-TE spiral RT-MRI data, and provides a practical performance improvement in articulator sharpness when applied to speech production imaging.

Algorithms

Computer Simulation

Healthy Volunteers

Humans

Image Processing, Computer-Assisted - methods

Magnetic Resonance Imaging

Mouth - diagnostic imaging

Palate, Soft - physiology

Pharynx - physiology

Reproducibility of Results

Signal Processing, Computer-Assisted

Speech - physiology

Tongue - physiology

Details

Title: Subtitle: Dynamic off-resonance correction for spiral real-time MRI of speech
Creators: Yongwan Lim - University of Southern California
Sajan Goud Lingala - University of Southern California
Shrikanth S Narayanan - University of Southern California
Krishna S Nayak - University of Southern California
Resource Type: Journal article
Publication Details: Magnetic resonance in medicine, Vol.81(1), pp.234-246
DOI: 10.1002/mrm.27373
PMID: 30058147
PMCID: PMC6258270
ISSN: 0740-3194
eISSN: 1522-2594
Grant note: R01 DC007124 / NIDCD NIH HHS NIH Clinical Center R01DC007124 / NIH HHS 1514544 / National Science Foundation
Language: English
Date published: 01/2019
Academic Unit: Roy J. Carver Department of Biomedical Engineering; Radiology
Record Identifier: 9984197141102771

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