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DEVELOPMENT AND CLINICAL APPLICATION OF THREE DIMENSIONAL CEPHALOMETRY WITHOUT X-RAY IRRADIATION

无X射线照射三维头影测量技术的发展及临床应用

基本信息

批准号：
12672015
负责人：
KASAI Kazutaka
金额：
$ 2.18万
依托单位：
Nihon University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12672015/
关键词：
MRI THREE-DIMENSIONAL ANALYSIS CEPHALOGRAM MRI 3次元解析

项目摘要

The research plan of this year is composed of reconstructive three dimensional images, three dimensional measurement of adenoid, and the development of three dimensional cephalogram for the measurement of hard tissue and soft tissue in craniofacial morphology. For the pilot study metal artifact was assessed to examine the metal artifacts on MR images of a variety of orthodontic appliances (11 types) using a phantom and to evaluate the MR images of TMJ patient with orthodontic appliances (5 types) on clinical experiments.The following results were obtained :1. Most orthodontic appliances such as bracket, hook, tube attachment, wire produced severe metal artifacts except for ceramic bracket, wire of NiTi on phantom study. These orthodontic appliances were produced metal artifacts ranging from 0.4 cm to 11.9 cm on phantom study.2. On clinical experiments, it was possible to examine the TMJ on MR imaging in Type A.Although most of patients with orthodontic appliances can examine the TMJ using MR imaging, authors recommend that patients with orthodontic appliances should use a surface coil and removing the orthodontic appliances of molar and wire for accurate MR examination.For considering the application of three dimensional reconstruction images to clinical dentistry, we analyzed various measurements of craniofacial morphology using reconstructive images. Especially we focused to adenoid which is an important for orthodontists to diagnose growth prediction of maxilloface. The results suggested that the under-ten generation had adenoid which classified four categories from I to IV, the ratio of category IV in young generation was larger than that in adult generation. The size of adenoid was associated with the size of palatal tonsil. Furthermore, it is possible to assess the hard and soft tissue morphology in craniofacial morphology by superimposing cephalogram and three dimensional reconstructive images of MRI.

今年的研究计划包括重建三维图像，腺样体的三维测量，以及开发三维头影测量颅面硬组织和软组织的形态。通过对金属伪影的初步研究，利用体模检查各种正畸矫治器(11种类型)的MR图像上的金属伪影，并在临床实验中对使用正畸矫治器(5种类型)的TMJ患者的MR图像进行评价。这些正畸矫治器在体模研究中产生了从0.4厘米到11.9厘米的金属伪影。在临床实验中，虽然大多数使用正畸矫治器的患者可以使用MR成像检查TMJ，但作者建议使用正畸矫治器的患者使用表面线圈并移除正畸矫治器的磨牙和金属丝进行准确的MR检查。为了考虑将三维重建图像应用于临床牙科，我们分析了使用重建图像的各种颅面形态测量结果。重点对腺样体进行了研究，腺样体是正畸医生诊断颌面部生长发育预测的重要指标。结果表明，10岁以下世代有腺样体，分为I~IV四类，青年世代的比例大于成年世代。腺样体的大小与腭扁桃体的大小有关。此外，通过头颅侧位片和MRI三维重建图像的叠加，可以评估颅面形态中的硬组织和软组织形态。