Abstract

Purpose
To evaluate the feasibility of through‐time spiral generalized autocalibrating partial parallel acquisition (GRAPPA) for low‐latency accelerated real‐time MRI of speech.
Methods
Through‐time spiral GRAPPA (spiral GRAPPA), a fast linear reconstruction method, is applied to spiral (k‐t) data acquired from an eight‐channel custom upper‐airway coil. Fully sampled data were retrospectively down‐sampled to evaluate spiral GRAPPA at undersampling factors R = 2 to 6. Pseudo‐golden‐angle spiral acquisitions were used for prospective studies. Three subjects were imaged while performing a range of speech tasks that involved rapid articulator movements, including fluent speech and beat‐boxing. Spiral GRAPPA was compared with view sharing, and a parallel imaging and compressed sensing (PI‐CS) method.
Results
Spiral GRAPPA captured spatiotemporal dynamics of vocal tract articulators at …

Date

2017

Authors

Sajan Goud Lingala, Yinghua Zhu, Yongwan Lim, Asterios Toutios, Yunhua Ji, Wei‐Ching Lo, Nicole Seiberlich, Shrikanth Narayanan, Krishna S Nayak

Journal

Magnetic resonance in medicine

Volume

78

Issue

6

Pages

2275-2282