Compared with gray-matter signal intensity, immature myelin carried short T 1 and long T 2 relaxation time, while matured myelin carried short T 1 and short T 2 relaxation time.

• 髓鞘形成中的MRI信号变化 :相对于灰质信号 ,未成熟的髓鞘呈短T1和长T2 ,在T1WI上呈高信号与灰质易区别 ;