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从三维电影磁共振成像数据测量声道面积功能的时间变化。

Measurement of temporal changes in vocal tract area function from 3D cine-MRI data.

作者信息

Takemoto Hironori, Honda Kiyoshi, Masaki Shinobu, Shimada Yasuhiro, Fujimoto Ichiro

机构信息

ATR Human Information Science Laboratories, 2-2-2 Hikaridai, Seika-cho, Soraku-gun, Kyoto, 619-0288 Japan.

出版信息

J Acoust Soc Am. 2006 Feb;119(2):1037-49. doi: 10.1121/1.2151823.

Abstract

A 3D cine-MRI technique was developed based on a synchronized sampling method [Masaki et al., J. Acoust. Soc. Jpn. E 20, 375-379 (1999)] to measure the temporal changes in the vocal tract area function during a short utterance /aiueo/ in Japanese. A time series of head-neck volumes was obtained after 640 repetitions of the utterance produced by a male speaker, from which area functions were extracted frame-by-frame. A region-based analysis showed that the volumes of the front and back cavities tend to change reciprocally and that the areas near the larynx and posterior edge of the hard palate were almost constant throughout the utterance. The lower four formants were calculated from all the area functions and compared with those of natural speech sounds. The mean absolute percent error between calculated and measured formants among all the frames was 4.5%. The comparison of vocal tract shapes for the five vowels with those from the static MRI method suggested a problem of MRI observation of the vocal tract: data from static MRI tend to result in a deviation from natural vocal tract geometry because of the gravity effect.

摘要

基于同步采样方法[Masaki等人,《日本声学学会杂志E》20,375 - 379(1999)]开发了一种三维电影磁共振成像(3D cine - MRI)技术,用于测量日语短发音/aiueo/期间声道面积函数的时间变化。在男性说话者重复发出该发音640次后,获得了头颈部体积的时间序列,并逐帧从中提取面积函数。基于区域的分析表明,前后腔的体积倾向于相互变化,并且在整个发音过程中,喉部和硬腭后缘附近的面积几乎保持不变。从所有面积函数中计算出较低的四个共振峰,并与自然语音的共振峰进行比较。所有帧中计算出的共振峰与测量出的共振峰之间的平均绝对百分比误差为4.5%。将五个元音的声道形状与静态MRI方法得到的形状进行比较,揭示了MRI观察声道时存在的一个问题:由于重力效应,静态MRI数据往往会导致与自然声道几何形状产生偏差。

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