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Development of Magnetic Field Imaging System Using CT Technique.

利用CT技术开发磁场成像系统。

基本信息

批准号：
01850092
负责人：
NAKAJIMA Masato
金额：
$ 2.18万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B).
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01850092/
关键词：
Magnetic Field Measurement Tomography CT Electromagnetic Induction

项目摘要

The purpose of this study is to develop the magnetic field imaging system which applies CT technique to the electromagnetic induction measurement.In 1989. The basic experiment was performed for deciding the specifications of the developed system, and then, the magnetic field imaging system was produced according to the specification. In this system, the diameter of the reconstructed region is 10cm and the spatial resolution is 0.5mm.In 1990, the efficacy of the developed system was confirmed by the experiment performed using the system. In the experiment, the magnetic fields leaking from permanent magnets were imaged and the distribution of the magnetic flux density and the magnetic potential were reconstructed. It took 2 minutes to collect whole projection data which was required for image reconstruction, and 20 minutes to calculate the reconstruction using 16 bit personal computer. In case that the spatial resolution is set to 2mm, only 3 minutes were required for both collecting the projection data and calculating the reconstruction. Next, the quantitative accuracy of the reconstructed image obtained by the developed system was demonstrated. The comparison of the reconstructed image to the measurement using a gauss meter, which is a conventional tool for magnetic field measurement, shows that the both measurements were almost same.Consequently, the efficacy of the magnetic field imaging system developed in the research confirmed. However, there are some problems for the practical use of the system. It is impossible to image the magneic field surrounded by some object, since the projections in the range of 360^ﾟ are required. It is also impossible to image the magnetic field distributing wider than the reconstructed region. The problems will be solved in the future research.

本研究的目的是开发将CT技术应用于电磁感应测量的磁场成像系统。1989年，进行了基础实验，确定了开发系统的规格，然后根据规格生产了磁场成像系统。在该系统中，重建区域的直径为10cm，空间分辨率为0.5mm。1990年，使用该系统进行的实验证实了所开发系统的有效性。在实验中，对永磁体泄漏的磁场进行了成像，并重建了磁通密度和磁势的分布。收集图像重建所需的整个投影数据需要2分钟，使用16位个人计算机计算重建需要20分钟。当空间分辨率设置为2mm时，采集投影数据和计算重建只需要3分钟。接下来，证明了所开发的系统获得的重建图像的定量准确性。将重建图像与使用传统磁场测量工具高斯计进行的测量进行比较，结果表明两者的测量结果几乎相同。因此，本研究中开发的磁场成像系统的功效得到了证实。但该系统在实际使用中还存在一些问题。不可能对某个物体包围的磁场进行成像，因为需要 360^ﾟ范围内的投影。也不可能对比重建区域更宽的磁场分布进行成像。这些问题将在今后的研究中得到解决。