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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。
Magnetic resonance diffusion imaging (DWI) is currently the only method of measuring and imaging water molecules in vivo. The rate of diffusion of water molecules and their state of motion reflect changes of micrometer order of magnitude, which are in the same order of magnitude as the size of cells in human tissues. Therefore, unlike the previous T1WI and T2WI methods, the diffusion imaging of water molecules makes the research of MRI on the human body to a more micro level, which reflects the microscopic structure of human tissues and the transfer and transmembrane movement of water molecules both inside and outside cells. Temperature changes. This article reviews the clinical application and progress of DWI in the diagnosis of brain metastases.