Ozcan Alpay
Biomedical MR Laboratory, Mallinckrodt Institute of Radiology, Washington University in Saint Louis, School of Medicine, Box 8227, St. Louis, MO 63110, USA.
J Magn Reson. 2005 Feb;172(2):238-41. doi: 10.1016/j.jmr.2004.10.013.
A set of necessary conditions for the choice of diffusion gradient vectors to make the linear equations nonsingular for the estimation of the diffusion matrix are given in a coordinate free manner. The conditions assert that the initial step in the design of a DTI experiment with six or more acquisitions must be to select six valid diffusion gradients first and then add new ones.
以无坐标方式给出了一组选择扩散梯度向量以使线性方程对于扩散矩阵估计非奇异的必要条件。这些条件表明，在设计具有六个或更多采集的扩散张量成像（DTI）实验时，初始步骤必须是首先选择六个有效的扩散梯度，然后再添加新的梯度。
