Yamada T, Mori Y, Minami K, Mishima K, Sugahara T, Sakuda M
Department of Oral and Maxillofacial Surgery II, Faculty of Dentistry, Osaka University, Suita-City, Japan.
J Craniomaxillofac Surg. 1999 Dec;27(6):345-53. doi: 10.1054/jcms.1999.0097.
The appearance of the nostril in cleft lip patients is very important in the subjective assessment of naso-labial forms and patient satisfaction. To improve the outcome of plastic surgery, a computer aided diagnostic system was developed. Facial forms were measured with a three-dimensional optical scanner (Ogis Range Finder RFX-IV) XYZ coordinates (256x240) and RGB (red, green, blue) image (512x480) data sets were then obtained with the apparatus. The nostril area was determined by discriminant analysis of the RGB data, and the landmarks of the nostril were extracted under geometric conditions. To assess the reliability of this technique with head inclination, five volunteers were measured in seven postures. Landmark stability was within approximately 1 mm when the Frankfort plane was 45-60 degrees. Subsequently, this system was applied to two cleft lip patients who had undergone a secondary nasal correction. For control data, 37 healthy adults (22 males and 15 females) were measured in the same manner. Nasal asymmetry in the unilateral case and wide and flat nostrils in the bilateral case were greatly improved after surgery. Conversely, the volume of the nasal tip decreased. This system was a great help in the diagnosis of nostril abnormalities.
在唇裂患者鼻唇形态的主观评估及患者满意度方面，鼻孔外观非常重要。为改善整形手术效果，开发了一种计算机辅助诊断系统。使用三维光学扫描仪（Ogis Range Finder RFX-IV）测量面部形态，然后用该设备获取XYZ坐标（256x240）和RGB（红、绿、蓝）图像（512x480）数据集。通过对RGB数据的判别分析确定鼻孔区域，并在几何条件下提取鼻孔的标志点。为评估该技术在头部倾斜情况下的可靠性，对五名志愿者在七种姿势下进行了测量。当法兰克福平面为45 - 60度时，标志点稳定性在约1毫米以内。随后，该系统应用于两名接受过二次鼻整形的唇裂患者。作为对照数据，以相同方式对37名健康成年人（22名男性和15名女性）进行了测量。单侧病例的鼻不对称以及双侧病例中宽大扁平的鼻孔在手术后有了很大改善。相反，鼻尖体积减小。该系统对鼻孔异常的诊断有很大帮助。
