According to the magnetic circuit design theory and performance requirements of magnetic field, an H-type permanent magnetic actuator that generates uniform magnetic field larger than 0.4 T in the interested re- gion has been designed in this paper. The static magnetic field simulation analysis was done by Ansoft＇ s Max- well three-dimensional （3D） software. The simulation results showed that the magnetic field of this system can meet the requirements, and this permanent magnetic actuator designed in this paper can be used in small nuclear magnetic resonance （NMR） svstem.
近年来功能磁共振成像(functional Magnetic Resonance Imaging,fMRI)技术在人类脑科学研究中得到了越来越广泛的应用,用于fMRI的人体感官刺激手段和装置也在不断发展。如何准确认识各种fMRI研究对刺激装置的不同需求,并针对其开发设计适用的刺激装置,正成为脑功能研究中亟需解决的一个难题。本文简单介绍了fMRI对刺激装置的需求背景,着重分析评价了fMRI研究中各类刺激装置的研发和使用现状,归纳了目前fMRI刺激装置在开发和应用方面存在的问题,并基于上述内容对其发展趋势做出展望。本文着力于对该领域作一个全景式的概括,使相关人员通过阅读本文获得对该领域的整体把握。
