Abstract

Purpose
To develop and evaluate a technique for 3D dynamic MRI of the full vocal tract at high temporal resolution during natural speech.
Methods
We demonstrate 2.4 × 2.4 × 5.8 mm3 spatial resolution, 61‐ms temporal resolution, and a 200 × 200 × 70 mm3 FOV. The proposed method uses 3D gradient‐echo imaging with a custom upper‐airway coil, a minimum‐phase slab excitation, stack‐of‐spirals readout, pseudo golden‐angle view order in kx‐ky, linear Cartesian order along kz, and spatiotemporal finite difference constrained reconstruction, with 13‐fold acceleration. This technique is evaluated using in vivo vocal tract airway data from 2 healthy subjects acquired at 1.5T scanner, 1 with synchronized audio, with 2 tasks during production of natural speech, and via comparison with interleaved multislice 2D dynamic MRI.
Results
This technique captured known dynamics of vocal tract articulators during …

Date

2019

Authors

Yongwan Lim, Yinghua Zhu, Sajan Goud Lingala, Dani Byrd, Shrikanth Narayanan, Krishna Shrinivas Nayak

Journal

Magnetic resonance in medicine

Volume

81

Issue

3

Pages

1511-1520