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Development and its applications of three dimensional head model construction system utilizing frontal/lateral cephalograms and facial photographs.

利用正面/侧面头影和面部照片的三维头部模型构建系统的开发及其应用。

基本信息

批准号：
12470462
负责人：
NAKASIMA Akihiko
金额：
$ 9.22万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

Three-dimensional visualization of human head has been frequently utilized for diagnosis and treatment of cranio-facial deformities in medical and denal area. Computed tomography can supply three dimensional image (3D-CT) ), but it needs large X-ray exposure. The present study aimed to construct individual 3D head model using ordinal head X-ray, facial photograph and dental cast.Computed tomography of the head and dental cast were taken from volunteers of adult males (11 subjects) and females (10 subjects). Three-dimensional coordinates of selected anatomical landmarks on the soft and hard tissue on 3D-CT images ware calculated and their averages were computed for both groups. The corresponding landmarks on ready-made head model (Viewpont, Co. Ltd, USA) were fitted to these mean coordinates. Thus, the standard Japanese adult male/female head models were obtained. To represent an individual model, we introduce a model-based construction method using photogrammetric shape extraction from X-ray and facial images of patient in order to modify standard facial/skeletal models. The dental shape is also modified by digitizing dental cast. This new method is possible to reproduce three dimensional integrated model on a personal computer and view the structure from any desired angle.As a clinical applications, this new method was employed to perform computer simulation for patients with mandibular prognathism who underwent saggital splitting ramus osteotomy. The simulated postoperative skeletal/facial images ware similar to the actual ones obtained after surgery. It will provide easy-to-understand information about treatment to the patients.

头部三维可视化技术已广泛应用于颅颌面畸形的诊断和治疗。计算机断层扫描（3D-CT）可以提供三维图像，但它需要大量的X射线曝光。本研究的目的是利用头颅X线片、面部照片和牙模建立个体化的三维头颅模型，方法是对11名男性志愿者和10名女性志愿者的头颅和牙模进行CT扫描。计算3D-CT图像上软组织和硬组织上所选解剖标志的三维坐标，并计算两组的平均值。将现成头部模型（Viewpont，Co. Ltd，USA）上的相应标志与这些平均坐标拟合。因此，获得了标准的日本成年男性/女性头部模型。为了表示一个单独的模型，我们引入了一个基于模型的构造方法，使用摄影测量形状提取从X射线和面部图像的病人，以修改标准的面部/骨骼模型。牙齿形状也通过数字化牙齿模型来修改。该方法可在计算机上实现三维模型的重建，并可从任意角度观察下颌骨结构，作为临床应用，对下颌骨多颌畸形患者行下颌升支矢状劈开截骨术进行了计算机模拟。模拟的术后骨骼/面部图像与手术后获得的实际图像相似。它将为患者提供易于理解的治疗信息。