摘要
Abstract
Among the magnetic resonance imaging equipment,the magnet system is an important structure,and the uniformity and stability of the magnetic field are two important factors affecting the imaging quality of the magnet system.In this paper,taking the 0.35 T permanent magnet as the research object,based on the mathematical model of single patch correction magnetic field matrix,the planning of shimming radius is completed,the planning method of gradual superposition and supplement is adopted,and the uniformity of magnets before and after shimming is compared and analyzed.After that,a detector is designed to detect the uniformity of the main magnetic field of magnetic resonance,and the computer simulation method is adopted to compare and analyze the detection results of different measuring points,which finally proves the high efficiency of the shimming design.Since the new detection method can continuously obtain the plane uniformity of the magnetic field,the detection results are more accurate and reliable.关键词
磁共振成像/永磁体/匀场设计/均匀性检测/计算机仿真Key words
magnetic resonance imaging/permanent magnet/shimming design/uniformity detection/computer simulation分类
医药卫生
