Sagittal imaging T1W (500/50/1) wasperformed firstly and definite unremarkable, then we divided into 4 layer from the top of corpus callosum to the inner skull in sagittal position, slice thickness 6 mm, slice interval 2 mm.

• 先行矢状位T1加权定位像的扫描（500/50/1）[重复时间（tr）/回波时间（TE）/激励次数]，在完成常规脑扫描确定无异常后，在矢状位图像上定位4层T1加权轴位图像，层厚为6mm，层间隔2mm，位置自胼胝体体部上缘开始，到颅骨下缘。