Li L
Metabolic Magnetic Resonance Research & Computing Center, Department of Radiology, University of Pennsylvania, Philadelphia 19104, USA.
Magn Reson Med. 2001 Nov;46(5):907-16. doi: 10.1002/mrm.1276.
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 CuSO(4) phantoms based on their MR gradient echo phase maps.
磁共振测量在磁共振技术发展和医学应用中有着广泛的应用。本研究提出了一种在非均匀磁场中对任意形状物体进行通用磁化率定量测量的方法。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原位获得物体内部感兴趣位置的极化磁场。通过自退磁场的数值计算和接触位移校正，基于硫酸铜（CuSO₄）体模的磁共振梯度回波相位图对其磁化率进行了定量测量。
