Methods Thirty-two cases of astrocytoma proved by operation and pathology were reviewed. MRI quantitative parameters,such as the relative signal intensity on T1WI,T2WI(RSI_ 0 )and Gd-enhanced T1WI (RSI_ Gd ) and enhancement percentage(EP),were measured.

• 方法 收集手术病理证实的脑星形细胞瘤 32例 ,计算下列MRI定量指标 :T1WI、T2WI上的相对信号强度 (RSI0 )、增强后相对信号强度 (RSIGd)及信号强度增加百分率 (EP)。