Real-Time Magnetic Resonance Imaging of Velopharyngeal Activities With Simultaneous Speech Recordings
Real-Time Magnetic Resonance Imaging of Velopharyngeal Activities With Simultaneous Speech Recordings
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DOI：
10.1597/09-158
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发表时间：
2011-11-01
期刊：
影响因子：
--
通讯作者：
Sutton, Bradley P.
中科院分区：
文献类型：
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作者：
Bae, Youkyung;Kuehn, David P.;Sutton, Bradley P.
目的：通过将快速磁共振成像 (MRI) 与同步语音记录和随后的声学分析相结合，检查正常人在声学鼻化语音片段期间腭咽机制的声学和生理方面之间的关系。 设计：10 名正常白种人成年个体参与了这项研究。当参与者重复说出两个速率受控的无意义音节（包括/zanaza/和/zunuzu/）时，进行正中矢状动态磁共振成像（MRI）和同步语音录音。鼻化的声学特征表示为第一共振频率（F1）的峰值幅度和带宽，是从每秒 30 组的语音中导出的。生理信息基于动态 MRI 数据测量的软腭和舌头位置变化，这些数据以每秒 21.4 幅图像的速率获取，并以每秒 30 幅图像的相应速率重新采样。将鼻化的每个声学特征在性别、元音背景以及软腭和舌头位置变量上进行回归。结果：以F1峰值幅度和带宽变化为代表的鼻化声学特征受到鼻辅音周围的元音背景、软腭抬高位置和舌尖高度的显着影响。结论：快速MRI结合声学分析成功地应用于研究腭咽机构与当前所使用的语音样本类型的声学生理关系。研究。未来的应用是可行的，以检查腭咽机制的解剖学和生理学偏差如何在腭咽功能不全的个体中在声学上表现出来。
Objective: To examine the relationships between acoustic and physiologic aspects of the velopharyngeal mechanism during acoustically nasalized segments of speech in normal individuals by combining fast magnetic resonance imaging (MRI) with simultaneous speech recordings and subsequent acoustic analyses.Design: Ten normal Caucasian adult individuals participated in the study. Midsagittal dynamic magnetic resonance imaging (MRI) and simultaneous speech recordings were performed while participants were producing repetitions of two rate-controlled nonsense syllables including /zanaza/ and /zunuzu/. Acoustic features of nasalization represented as the peak amplitude and the bandwidth of the first resonant frequency (F1) were derived from speech at the rate of 30 sets per second. Physiologic information was based on velar and tongue positional changes measured from the dynamic MRI data, which were acquired at a rate of 21.4 images per second and resampled with a corresponding rate of 30 images per second. Each acoustic feature of nasalization was regressed on gender, vowel context, and velar and tongue positional variables.Results: Acoustic features of nasalization represented by F1 peak amplitude and bandwidth changes were significantly influenced by the vowel context surrounding the nasal consonant, velar elevated position, and tongue height at the tip.Conclusions: Fast MRI combined with acoustic analysis was successfully applied to the investigation of acoustic-physiologic relationships of the velopharyngeal mechanism with the type of speech samples employed in the present study. Future applications are feasible to examine how anatomic and physiologic deviations of the velopharyngeal mechanism would be acoustically manifested in individuals with velopharyngeal incompetence.