Using a radial ultrasound probe's virtual origin to compute midsagittal smoothing splines in polar coordinates (2015)
Type of ContentJournal Articles
PublisherUniversity of Canterbury. New Zealand Institute of Language, Brain & Behaviour
AuthorsHeyne, M., Derrick, D.show all
Tongue surface measurements from midsagittal ultrasound scans are effectively arcs with deviations representing tongue shape, but smoothing-spline analysis of variances (SSANOVAs) assume variance around a horizontal line. Therefore, calculating SSANOVA average curves of tongue traces in Cartesian Coordinates [Davidson, J. Acoust. Soc. Am. 120(1), 407–415 (2006)] creates errors that are compounded at tongue tip and root where average tongue shape deviates most from a horizontal line. This paper introduces a method for transforming data into polar coordinates similar to the technique by Mielke [J. Acoust. Soc. Am. 137(5), 2858–2869 (2015)], but using the virtual origin of a radial ultrasound transducer as the polar origin—allowing data conversion in a manner that is robust against between-subject and between-session variability.
CitationHeyne, M., Derrick, D. (2015) Using a radial ultrasound probe's virtual origin to compute midsagittal smoothing splines in polar coordinates. The Journal of the Acoustical Society of America, 138(6), pp. EL509-EL514.
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