Variations in Velopharyngeal Structures Between Upright and Supine Positions Using Upright Magnetic Resonance Imaging
Variations in Velopharyngeal Structures Between Upright and Supine Positions Using Upright Magnetic Resonance Imaging
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DOI：
10.1597/09-256
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发表时间：
2011-03-01
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影响因子：
--
通讯作者：
Perry, Jamie L.
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作者：
Perry, Jamie L.
目的：尚无研究使用 MRI 来比较直立位和仰卧位之间腭咽肌肉组织的尺寸变化。本研究的目的是比较四名女性受试者在休息和持续言语产生期间处于仰卧位和直立位的腭咽机构的结构。方法：使用 0.6 特斯拉开放式多位置 MRI 扫描仪对四名 30 至 36 岁（平均 32.5 +/- 1.75 岁）的健康白人女性受试者进行成像。受试者以两种身体姿势完成两项言语任务（/i/ 和 /s/）。 结果：软腭测量（长度、厚度和高度）、咽测量（软腭后和舌后）和提上睑肌测量（长度和起始角度）显示直立和仰卧位置之间存在微小差异。对于所有受试者来说，两个位置之间产生 /i/ 时软腭高度的差异都很显着。在大多数情况下，软腭厚度几乎保持不变（组平均差异在 -0.2 至 1.2 毫米之间）。组平均值表明，从直立到仰卧的提上睑肌在休息时平均缩短 2.8 毫米，在 /i/ 生产期间缩短 2.0 毫米，在 /s/ 生产期间缩短 2.3 毫米。 /i/ 产生的提肌缩短百分比为 17%，/s/ 产生的提肌缩短百分比为 21%，这与身体位置无关。结论：总体而言，重力对软腭厚度、软腭长度、软腭高度、提肌长度、起始角度和咽部尺寸的影响最小。在休息或产生 /i/ 和 /s/ 期间，两种身体姿势（直立和仰卧）之间的差异并不显着，除了 /i/ 产生期间软腭高度的差异。
Objective: No studies have used MRI to compare the dimensional changes of the velopharyngeal musculature between upright and supine positions. The purpose of this study is to provide a comparison between structures of the velopharyngeal mechanism while in the supine and upright positions during rest and sustained speech productions of four female subjects.Methods: Four healthy white female subjects between 30 and 36 years of age (mean, 32.5 +/- 1.75 years) were imaged using a 0.6-tesla open-type multi-position MRI scanner. Subjects produced two speech tasks (/i/ and /s/) in the two body positions.Results: Velar measures (length, thickness, and height), pharyngeal measures (retrovelar and retrolingual), and levator muscle measures (length and angles of origin) demonstrated a small variation between upright and supine positions. Differences in velar height during production of /i/ between the two positions was significant for all subjects. In most cases, the velar thickness remained nearly the same (group mean difference was between -0.2 and 1.2 mm). Group means demonstrated an average levator muscle shortening from upright to supine of 2.8 mm at rest, 2.0 mm during /i/ production, and 2.3 mm during /s/ production. Percentage of levator shortening were 17% for /i/ production and 21% for /s/ production, which were independent of body position.Conclusions: Overall, gravity had a minimal effect on velar thickness, velar length, velar height, levator muscle length, angles of origin, and pharyngeal dimensions. Differences between the two body positions (upright and supine) were not significant during rest or during production of /i/ and /s/, with the exception of velar height during /i/ production.