结论：正常人脑各部位ADC值的研究为弥散成像进一步临床应用和脑老化研究提供了很好的依据和指导。
Conclusions: The study of ADCAV values in normal human brains can be used for reference and instruction in future clinical studies and normal brain aging.
目的：评价近似弥散系数（ADC）在鉴别星形细胞肿瘤、瘤周水肿及正常组织中的作用，以及对星形细胞肿瘤良、恶性评估中的价值。
Purpose:To evaluate the usefulness of ADC in differentiating tumor, edema, and normal brain tissue, and in grading the malignancy of cerebral astrocytomas.
结果磁共振弥散加权成像通过测量肝脏内的水分子弥散运动，从而了解肝脏局灶性和弥漫性病变与肝脏正常结构和功能的差异。
Results DWI could demonstrate the normal and abnormal structure and function through measuring the diffusion motions of water molecule in the liver.
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