The mean FA ratios of the corticospinal tracts in cerebral peduncle and basilar part of pons were 0.73(97.6%) and 0.63(96.8%) in 40 healthy volunteers,and they were 0.72(96.0%) and 0.64(95.0%) in 10 normal variants;

• 正常志愿者大脑脚、脑桥基底部皮质脊髓束走行区各向异性分数(fractional anisotropy；FA)均值分别为0.；73和0