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.

今年的研究计划由重建性三维图像，腺样体的三维测量以及三维头膜的发展，用于测量颅面形态中硬组织和软组织。对于试验研究，评估了金属伪像，以检查使用幻影的多种正畸电器（11种类型）的MR图像上的金属伪像，并评估具有临床实验的正畸家具（5种类型）的TMJ患者的MR图像。获得以下结果。大多数正畸电器，例如支架，钩子，管子附着，电线都产生了严重的金属伪像，除陶瓷支架外，NITI丝的幻影研究。这些正畸电器是在幻影研究中生产的金属伪像，范围从0.4 cm至11.9 cm。在临床实验上，可以使用MR成像检查TMJ对MR成像的TMJ检查，尽管大多数具有正畸电器的患者都可以使用MR成像检查TMJ，但作者建议使用正畸电器的患者使用表面线圈并卸下摩尔和电线的临床临床，以考虑摩尔和电线的临床。使用重建图像分析了颅面形态的各种测量。尤其是我们专注于腺样体，这对于牙齿矫正医生诊断上颌骨的生长预测非常重要。结果表明，三个以下的生成具有从I到IV的四个类别分类的腺样体，年轻一代中IV类的比率大于成人一代。腺样体的大小与扁桃体的大小有关。此外，可以通过叠加头皮图和MRI的三维重建图像来评估颅面形态中的硬组织形态和软组织形态。