Conclusion:Quantitative study of MRI and 1H MRS is essential for determination of normal myelinization and neuronal integrity and age-related biochemical changes in the brain.

• 结论：MRI及1H MRS定量研究对了解脑内髓鞘化进程、神经元的完整以及正常老年脑内生化改变等方面具有重要的价值。