Abstract

Purpose
To provide 3D real‐time MRI of speech production with improved spatio‐temporal sharpness using randomized, variable‐density, stack‐of‐spiral sampling combined with a 3D spatio‐temporally constrained reconstruction.
Methods
We evaluated five candidate (k, t) sampling strategies using a previously proposed gradient‐echo stack‐of‐spiral sequence and a 3D constrained reconstruction with spatial and temporal penalties. Regularization parameters were chosen by expert readers based on qualitative assessment. We experimentally determined the effect of spiral angle increment and kz temporal order. The strategy yielding highest image quality was chosen as the proposed method. We evaluated the proposed and original 3D real‐time MRI methods in 2 healthy subjects performing speech production tasks that invoke rapid movements of articulators seen in multiple planes, using interleaved 2D real …

Date

2021

Authors

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

Journal

Magnetic Resonance in Medicine

Volume

85

Issue

6

Pages

3182-3195