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目的评价MRI三维循环相位稳态采集快速成像（three—dimensional fast imaging employing steady state acquisition with cycled phases,3D FIESTA—C）和三维时间飞跃法扰相梯度回波（three—dimensional time of flight spoiled gradient recalled acquisition，3D TOF SPGR）序列对显示后颅窝颅神经及血管的价值。方法分析49例后颅窝肿块病例和29例神经