The signal intensity of cerebral(except basal ganglia)and cerebellar matter was slihgt hypo signal on the T 1WI,iso signal on the PDWI and hyper signal on the T 2WI.

• 胎儿的大脑（基底神经核除外）、小脑实质在T1加权上为略低信号，在质子密度加权上为等信号，在T2加权上为高信号。