摘要:目的评估MRI动态增强扫描对甲状腺良恶性结节的鉴别及诊断价值。方法选择经FNC证实的甲状腺纤维腺瘤患者32例,甲状腺癌患者30例,均进行MRI平扫及动态增强扫描,比较不同病变的影像学特点,测量感兴趣区及周边组织信号值,比较不同病灶在不同时间的强化值,绘制TIC曲线,比较不同结节的TIC差异。结果平扫甲状腺腺瘤表现为T1W1呈等或低信号,T2WI多呈高信号.甲状腺癌表现为T1wI不均匀低信号,T2WI多为不规则高信号,增强扫描均见不同程度强化,MRI增强扫描甲状腺癌1、2min强化率高于甲状腺腺瘤,TIC曲线甲状腺癌同甲状腺腺瘤存在明显差异.MRI增强扫描对甲状腺癌及甲状腺腺瘤的诊断率高于MRI平扫。结论甲状腺良恶性结节MRI动态增强扫描均具有特征性的影像学特点.TIC也存在显著的差异,MRI动态增强扫捕有助于甲状腺结节的鉴别及定性诊断。
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