DWI在脑转移瘤诊断中的临床应用

磁共振扩散成像（DWI）是目前在活体上进行水分子扩散测量与成像的唯一方法。水分子扩散运动速率与状态反映的是微米数量级的运动变化，与人体组织中细胞的大小处于同一数量级。因此，与以往的T1WI，T2WI不同，水分子扩散成像使磁共振成像对人体的研究深入到了更微观的水平，反映着人体组织的微观几何结构，以及细胞内外水分子的转移与跨膜运动、温度等变化。本文将DWI在脑转移瘤诊断中的临床应用及进展作一综述。

Application of DWI in the diagnosis of brain metastatic tumors

DWI is currently the only way to measure water diffusion and image in living body. Water diffusion rate and status reflect the number of micro-level changes in the movement, which is the same order of the size of human tissue cells. Therefore, DWI is different from the previous T1WI, T2WI, it studys body at the micro-level, reflects the human tissue micro-geometry, and the cells inside and outside the transfer of water molecules and transmembmne movement, temperature changes. Tiffs text reviews the advance and application of DWI in the diagnotie of brain metastasis tumors.