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论文类型：期刊论文

发表时间：2017-06-01

发表刊物：JOURNAL OF MAGNETIC RESONANCE

收录刊物：SCIE、EI、PubMed

卷号：279

页面范围：51-59

ISSN号：1090-7807

关键字：Topology optimization; Structural design; Unilateral NMR; Homogeneous field

摘要：This paper presents a topology optimization based design method for the design of unilateral nuclear magnetic resonance (NMR), with which a remote homogeneous field can be obtained. The topology optimization is actualized by seeking out the optimal layout of ferromagnetic materials within a given design domain. The design objective is defined as generating a sensitive magnetic field with optimal homogeneity and maximal field strength within a required region of interest (ROI). The sensitivity of the objective function with respect to the design variables is derived and the method for solving the optimization problem is presented. A design example is provided to illustrate the utility of the design method, specifically the ability to improve the quality of the magnetic field over the required ROI by determining the optimal structural topology for the ferromagnetic poles. Both in simulations and experiments, the sensitive region of the magnetic field achieves about 2 times larger than that of the reference design, validating validates the feasibility of the design method. (C) 2017 Published by Elsevier Inc.