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Development of measuring system of head by MRI

MRI头部测量系统的研制

基本信息

批准号：
08557102
负责人：
FUCHIHATA Hajime
金额：
$ 13.38万
依托单位：
OSAKA University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08557102/
关键词：
MRI Measurement Orthodontic 3D セファロ三次元計測

项目摘要

The aim of this study is to develop a measurement system on the head by magnetic resonance imaging.Volunteers were scanned by SIGNA HORIZON,1.5 tesla superconducted MR scanner. Head coil was used as a surface coil to improve the resolution of the image. As three dimensional scan, spoiled GRASS technique was applied and fast SE technique and conventional SE technique were also used as the contrast study.Image data was transferred off-line by magneto-optical disk to the work station "Advantage windows". By this work station, three dimensional measurement, including the distance and angle, was done using multi planar images.Three dimensional volume scanning with spoiled GRASS technique were available for whole head scanning and it took shorter time compared with SE technique. However, metallic artifact was huge in some cases on the image by three dimensional scanning. It was suggested fast SE technique was also useful because acquisition time was not so long and metallic artifact was no so huge.As for the reference points for the orthodontic treatment, almost points were detected on the MR image. However, because point-N (Nasion) is defined as a fusion point of the two bones, it was difficult to detect. Although there were some disadvantages in the bony tissue on MR image, soft tissue points, such as tip of the nose, lip, tongue, epiglottis, were detected. And these points must be useful and important for the cosmetic problem.

本研究的目的是建立一个头部磁共振成像测量系统，使用SIGNA HORIZON，1.5T超导磁共振扫描仪对志愿者进行扫描。头部线圈用作表面线圈，以提高图像的分辨率。三维扫描采用扰相GRASS技术，对比研究采用快速SE技术和常规SE技术，图像数据通过磁光盘离线传输到Advantagewindows工作站。该工作站可利用多平面图像进行三维测量，包括距离和角度，采用破坏GRASS技术进行三维容积扫描，可进行全头扫描，与SE技术相比，耗时更短。然而，通过三维扫描，在某些情况下，金属伪影在图像上是巨大的。快速SE技术采集时间短，金属伪影小，可用于正畸治疗参考点的定位。然而，由于N点（鼻根）被定义为两块骨头的融合点，因此难以检测。虽然MRI对骨性组织的显示有一定的局限性，但对鼻尖、唇、舌、会厌等软组织点的显示仍有一定的优势。这些点必须是有用的和重要的化妆品问题。