低场MRI对肝细胞癌的诊断价值

目的:探讨低场MRI在肝癌的诊断及鉴别诊断价值。材料与方法:回顾性分析38例肝癌在低场MRI信号强度改变。结果:低场MRI肝癌在T1WI呈较低信号;在T2WI信号不规则增高,呈高低混杂信号;其中肿瘤的脂肪变性,肿瘤的假包膜及静脉瘤栓为特征性改变。Gd-DTPA在低场MRI对肝癌诊断价值不大。结论:肝细胞癌在低场MRI信号强度以混杂信号多见,尤其在T2WI更为明显。脂肪变性在T1WI显示佳,假包膜在所有成像序列均呈低信号,静脉瘤栓在T1WI较T2WI显示好。

The Value of Low-Field Strength MRI in Diagnosing Hepatocellular Carcinoma

Purpose:To investigate the diagnostic and differential diagnostic value of low-field MRI in hepatocellular carcinoma(HCC).Materials and Methods:The change of low-field MRI signal intensity of HCC in 38 cases were reviewed retrospectively.Results:The signal intensity of low-field MRI in HCC presented ad slightly hypointensity on T_1WI and mixedintensity with irregular increased on T_2WI,among them,neoplastic fatty degeneration,pseudocapsules and the tumor thrombo in portal or hepatic veins are characteristic changes.Gd-DTPA in low-field MRI ha little value in diagnosing HCC.Conclusions:Low-field MRI signal intensity of HCC mainly presented as mixedintensity,expecially apparent on T_2WI.Fatty degeneration can be displayed well on T_1WI,pseudocapsules presented as hypointensity in all cholangiopancreatography sequence and tumor thrombo in portal or hepatic veins can be displayed well on T_1WI than T_2WI.