Three-dimensional System of Analyzing Lip Movement
Three-dimensional System of Analyzing Lip Movement
复制标题
三维嘴唇运动分析系统
DOI：
10.5927/jjjd1991.15.114
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
K. Ohyama
中科院分区：
文献类型：
--
作者：
M. Okudaira;T. Kawamoto;K. Ohkubo;T. Ono;N. Motohashi;K. Ohyama
目的：本研究的目的是介绍我们新开发的三维系统分析唇运动，使用基于视频的跟踪系统，并初步临床应用。材料与方法：放置在双侧内眦点和远眦点、双侧连合点以及上下嘴唇中心点上的黑色泡沫苯乙烯球（直径10 mm）的运动由两台摄像机（Dejimo VCC-277）跟踪，该摄像机具有用于分析动画图像的三维装置（Dejimo D4202-01-T）。利用双侧内眦点和远眦点建立三维坐标系来纠正头部运动后，在这些坐标系中测量嘴唇运动。通过与接触式三维测量单元（Mitsutoyo MXF 203）测量的值进行比较来评价该系统的测量可靠性。为了临床应用，在发音的一个长元音/a/唇运动进行了分析，在15个健康的成年人。分别计算双侧连合点和下唇中点的平均标准化轨迹模式。根据这个平均标准化的轨迹模式，在正颌手术前后的嘴唇运动的变化进行了检查，在两个病人的面部不对称和下颌前突。结果：该系统在X、Y、Z轴上的平均测量可靠性接近0.6mm，显示了机械精度。两名患者术后在受影响的连合点和下唇中心点发现的嘴唇运动明显偏离得到改善。两种情况下的术前偏离量以及术后改善量不同。结论：该方法的应用表明，临床上的可行性，在正颌手术后唇运动的变化进行动态分析。
Aim: The aim of this study is to introduce our newly developed three-dimensional system of analyzing the lip movement using a video-based tracking system, and its preliminary clinical application. Materials and methods: Motions of black foamed styrol balls (10 mm in diameter) placed on bilateral medial and distal canthal points, bilateral commissural points, and center point of the upper and lower lips, were tracked by two video cameras (Dejimo VCC-277) with a three-dimensional device for analyzing animation images (Dejimo D4202-01-T). After establishing the three-dimensional coordinate system using bilateral medial and distal canthal points to correct head motion, the lip movement was measured in these coordinates. Measurement reliability of this system was evaluated in comparison with values measured by a contact three-dimensional measuring unit (Mitsutoyo MXF203). For clinical application, during phonation of a long vowel/a/the lip movement was analyzed in 15 healthy adult subjects. The average standardized locus pattern of bilateral commissural points and center point of the lower lip was computed respectively. Based on this average standardized locus pattern, changes in the lip movement before and after orthognathic surgery were examined in two patients with facial asymmetry and mandibular protrusion. Results: The mean measurement reliability of this system was nearly 0.6mm in the X, Y, and Z axes, suggesting the mechanical accuracy. A marked deviation of the lip movement found in the affected commissural point and center point of the lower lip was improved in both patients after surgery. The amount of pre-operative deviation as well as that of post-operative improvement, was different in the two cases. Conclusion: Application of the method demonstrated clinical feasibility for the dynamic analysis of changes in lip movement after orthognathic surgery.