规MR不能反映表现正常脑灰质(normal-appearing gray matter, NAGM)和表现正常脑白质(normal-appearing white matter, NAWM)的隐匿性病灶; ③未将视神经、脊髓病灶考虑在内; ④皮层的重塑和功能重组。
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PET及ASL研究中，标准化摄取评价（SUVs）、病灶环流水平及正常脑白质被各自检测。
Standardized uptake values (SUVs) and perfusion levels of the lesion and the normal white matter were measured in FDG-PET and ASL studies, respectively.
结论健康人随年龄增长，正常脑白质ADC值呈现微弱的增长趋势，尤其是老年人增长趋势更为明显；
Conclusions ADC value of normal white matter presents tenuous increasing with aging in healthy people, especially in elderly people.
PET是病灶FDG摄取与正常脑白质比率进行比较，ASL是病灶大脑血环流量与正常脑白质比率进行比较。
The ratio of FDG uptake of the lesion to normal white matter in PET and the ratio of cerebral blood perfusion of the lesion to normal white matter also were compared.
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