This paper reviews the principle of DWI and DTI.Then,we introduce derivation of DTI from DWI thorough least square algorithm.Last we obtain other special information about diffusion from DTI.

• 本文介绍了弥散加重成像(DWI)和弥散张量成像(DTI)的原理,以及如何用最小二乘算法从DWI中获得DTI,然后再从DTI中获得其弥散特性指标的方法。