一种新的检测磁共振设备主磁场均匀性的设计

A Novel Design for Detecting Uniformity of Static Magnetic Field in MR

目的:为了弥补传统检测方法在检测效果上的缺陷,实现连续地从磁场平面获得其均匀度的数据。方法:设计了一个运动探测器来进行磁场的均匀性检测,将摄取的信号经过转换和数据处理,最后通过计算机仿真对基于有限测量点的传统方法进行了比较。结果:传统检测法的结果与检测时的采样方式(采点数和采点位置)密切相关,在仿真环境中同样的磁场在不同的检测方式下很大可能会得到多个不同的且不具有近似性的结果,特别是在不均匀性不规则分布的磁场中;而本设计只得到唯一的检测结果,并且可以看到检测视野内采点数越多其检测结果将越逼近本设计的结果。结论:本设计能有效弥补传统检测方法充分度和精确度不足的缺陷,同时也说明磁场的均匀性检测应该从连续平面获取数据。

Objective： In order to supplying a gap on the traditional method and gathering the consecutive data about uniformity from static magnetic field plane. Methods： Designing a mobile detector for detecting uniformity of magnetic field. With the transformation and processing of data, the novel method has been compared with the traditional methods of gathering data based on finite measuring point via simulation mode. Results： The result of traditional method is so related to sampling locations and hits that different result data which are not approximate appear in the same simulation field, especially in irregular field. However, the constant result can only appear in this new method, and it is obvious that the more hits in traditional method will take the closer result data to the result in this new method. Conclusions： The novel method is able to make up the flaws of traditional methods which are not precise enough. All these can also illuminate that uniformity-detecting of static magnetic field should better gather data from continual plane.