Application of MRI movie for observation of articulatory movement during a fricative /s/ and a plosive /t/
Application of MRI movie for observation of articulatory movement during a fricative /s/ and a plosive /t/
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DOI：
10.2319/060210-301.1
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发表时间：
2011-03-01
影响因子：
3.4
通讯作者：
Moriyama, K.
中科院分区：
文献类型：
--
作者：
Ng, I. W.;Ono, T.;Moriyama, K.
目的：在磁共振成像(MRI)电影中使用精确的牙齿可视化方法来观察关节之间的时空关系。材料和方法：受试者为两名志愿者。每个受试者重复一个元音-辅音-元音音节(即/ASA/；/ata/)，并使用梯度回声序列测量音程。然后将一个定制的透明固位体填充柠檬酸铁铵凝胶形式，安装到牙弓上，并进行T1加权涡轮自旋回波序列。标志物用于将切牙边界叠加到MRI电影的序列图像上。结果：在磁共振图像上，切牙边界清晰可见。叠加后，/t/-咬合时舌与腭部/门牙的接触距离大于/t/-咬合时的舌面接触距离。前腔有无牙齿重叠的图像有显著差异。结论：该方法能在MRI中清晰地提取出牙齿边界。利用该方法在制作摩擦片和阻塞片的过程中，观察到了舌体和牙齿之间的详细形态关系。(角度直角。2011；81：237-244。)
Objective: To use an accurate method of tooth visualization in magnetic resonance imaging (MRI) movie for the observation of spatio-temporal relationships among articulators.Materials and Methods: The subjects were two volunteers. Each subject repeated a vowel-consonant-vowel syllable (ie, /asa/; /ata/), and the run was measured using a gradient echo sequence. A custom-made clear retainer filled with the jelly form of ferric ammonium citrate was then fit onto the dental arch, and a T1-weighted turbo-spin-echo sequence was taken. Landmarks were used for superimposition of the incisor boundary onto sequential images of MRI movie. Tracings were conducted to observe the spatio-temporal relationships among articulators.Results: The incisor boundary was clearly visible in the magnetic resonance images. After superimposition, the contact distance of the tongue to palate/incisor was found to be longer during /t/-articulation than during /s/-articulation. There were prominent differences in images with and without tooth superimposition in the front oral cavity.Conclusions: The method could distinctly extract a tooth boundary in MRI. Detailed configurational relationships between the tongue and tooth were observed during the production of a fricative and a plosive in MRI movie using this method. (Angle Orthod. 2011;81:237-244.)