Magnetic susceptibility quantification for arbitrarily shaped objects in inhomogeneous fields
Magnetic susceptibility quantification for arbitrarily shaped objects in inhomogeneous fields
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DOI：
10.1002/mrm.1276
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发表时间：
2001-11-01
影响因子：
3.3
通讯作者：
Li, L
中科院分区：
文献类型：
--
作者：
Li, L
磁化率测量在磁共振技术发展和医学应用中有着广泛的应用。本文提出了一种适用于非均匀磁场中任意形状物体的磁化率定量方法。基于磁场的平均值特性，可以从包围物体的球面上的场值精确地获得物体内部感兴趣位置处的极化磁场。通过对自退磁场的数值计算和对接触位移的修正，利用磁共振梯度回波相位图定量测量了CuSO 4模型的磁化率。(C)2001 Wiley-Liss，Inc.
Magnetic susceptibility measurement has wide-ranging applications in MR technical development and medical applications. A general susceptibility quantitation method for objects of arbitrary shapes in inhomogeneous magnetic fields is presented in this study. Based on the mean value properties of magnetic fields, the polarizing magnetic field at the location of interest inside an object can be exactly obtained in situ from the field values on a spherical surface enclosing the object. With numerical computation of the self-demagnetizing field and correction of contact shifts, magnetic susceptibilities were quantitatively measured for CuSO4 phantoms based on their MR gradient echo phase maps. (C) 2001 Wiley-Liss, Inc.