目的探讨轻度脂肪肝的MRI化 学移位影像学表现。方法 对35例正常肝 脏和轻度脂肪肝的肝脏进行MRI化学移位 同、反位像影像学观察；MRI检查序列 为T1WI同相位(in-phase)，T1WI反相位 (out-phase)。结果 35例正常肝脏T1WI同 相位信号基本都为等信号，T1WI反相位呈 较高信号。35例轻度脂肪肝的肝脏T1WI同 相位信号基本都为等信号，21例T1WI反相 位呈等信号，14例呈稍高信号。结论 正 常肝脏反相位信号多明显高于同相位信 号，而肝脏反相位信号等于或稍高于同相 位信号时应考虑轻度脂肪肝。

Objective To investigate the MRI chemical shift imaging of the mild fatty liver. Methods To explore the imaging characteristics of MRI chemical shift among 35 cases of normal liver and mild fatty liver. MRI sequence of T1WI phase (in-phase), T1WI reverse phase (out-phase). Results The T1WI in phase signal of 35 cases of normal liver were basic signal, the T1WI out phase showed high signal. The T1WI in phase signal of 35 cases of mild fatty liver were equisignal, 21 cases showed equal T1WI reverse phase signal, 14 cases showed slightly higher signal. Conclusion When Liver out-phase signal is equal to or slightly higher than the in-phase signal, it should be considered mild fatty liver.