核磁共振成像超导主磁体设计及分析

The Investigation of Superconducting MRI Main Magnet Design

本文论述了不同结构的核磁共振成像超导主磁体设计的原理与计算机算法。编出的设计程序考虑了超导体的超导特性、磁场均匀性要求、磁体的经济性以及磁体结构选择等各方面的因素。用此程序对一系列具有不同磁体结构、不同中心场强、不同孔径要求的MRI超导主磁体进行设计计算及分析,获得了一些对实际设计MRI超导主磁体有参考价值的数据。此外,该程序还适用于其它具有圆柱对称性的高均匀度超导磁体的设计计算。

In this paper the harmonics of magnetic field up-to the 10th order in a supercon- ducting MRI main magnet are deduced and the methodology for design of various structures of superconducting MRI main magnet with consideration of superconductor characteristics and minimum superconductor requirement is discussed.A computer code which can be used to analysis and design five types of superconducting MRI main magnet is given.It may also be used for analysis of other homogeneous field magnet. By using this computer code w e calate and analyse several superconducting MRI main magnets with differend structure and compare them in aspects of magnetic field homogeneity and magnet thriftiness. The data obtained by us have have reference value for optimum choice of superconducting MRI main magnet structure.