核磁成像的无源被动匀场研究分析

Passive Passive Shimming for Magnetic Imaging

核磁成像简称MRI,是一种核磁共振成像技术,其基本原理是利用核磁共振产生长波穿透人体组织,形成医学影像,从而对人体肿瘤等进行显影分析。影响MRI设备高质量成像的主要因素是磁体系统中磁场均匀度,研究表明,磁场不均匀性会导致相关设备出现信息损失、几何形体图像失真及光谱测量线宽模糊等问题。

Nuclear magnetic imaging(MRI) is a kind of nuclear magnetic resonance imaging technology. Its basic principle is to use nuclear magnetic resonance to generate longwave penetration of human tissue to form medical images, so as to develop and analyze human tumors. The main factor affecting the high-quality imaging of MRI equipment is the uniformity of the magnetic field in the magnet system. Studies have shown that the magnetic field inhomogeneity can cause problems such as information loss, geometric image distortion and spectral line width blurring in related equipment.