11th Annual Conference of the International Speech Communication Association

Makuhari, Chiba, Japan
September 26-30. 2010

Improved Real-Time MRI of Oral-Velar Coordination Using a Golden-Ratio Spiral View Order

Yoon-Chul Kim, Shrikanth S. Narayanan, Krishna S. Nayak

University of Southern California, USA

In speech research using real-time magnetic resonance imaging (RT-MRI), frame reconstruction is typically performed with a constant temporal resolution. However, a flexible selection of temporal resolution is desirable because of natural variations in speaking rate and variations in the speed of different articulators. In this work, a novel spiral golden-ratio temporal view order was applied to nasal RT-MRI studies in imaging a mid-sagittal slice of the upper airway. Compared to conventional spiral bit-reversed temporal view order scheme, the proposed golden-ratio scheme provides less temporal blurring in the depiction of rapid tongue tip motion with a selection of high temporal resolution. It also provides higher signal-to-noise ratio (SNR) in the depiction of relatively slow velar motion with a selection of low temporal resolution.

Full Paper

Bibliographic reference.  Kim, Yoon-Chul / Narayanan, Shrikanth S. / Nayak, Krishna S. (2010): "Improved real-time MRI of oral-velar coordination using a golden-ratio spiral view order", In INTERSPEECH-2010, 1580-1583.