知识与财富的链接
目的:早期肝脏脓肿的影像学诊断困难,本研究分析DWI、T2WI及Gd-DTPA增强序列在检测早期肝脓肿中的价值。方法:对17例患者的17个早期肝脏脓肿分别进行了DWI、T2WI及Gd-DTPA增强检查,统计脓肿坏死区、非坏死区及正常肝脏在各序列的信号强度,计算坏死区、非坏死区及周围正常肝脏的ADC值,对坏死区、非坏死区及周围正常肝脏的ADC值进行比较。结果:脓肿坏死腔的ADC值\[(0.88±0.09) mm2/s\]很低,低于正常肝脏\[(1.31±0.12) mm2/s,P<0.05\],同时明显低于无明显坏死区\[(1.43±0.18) mm2/s,P<0.05\],在DWI及T2WI上均呈高信号,T1WI呈低信号,且增强图像无强化;而无明显坏死区ADC值\[(1.43±0.18) mm2/s\]则高于正常肝脏\[(1.31±0.12) mm2/s,P<0.05\],DWI及T2WI均呈中等高信号,T1WI呈低信号,增强有明显强化。结论:早期肝脓肿的磁共振表现有一定特征性,磁共振弥散加权成像有助于早期肝脓肿的诊断。
Objective:The imaging diagnosis of early liver abscess is difficult.This study is to evaluate the diagnostic value of DWI,T2WI and dynamic enhanced MR imaging for early liver abscess.Methods: DWI,T2WI and dynamic enhanced imaging scans were performed in 17 patients with 17 early liver abscesses.The signal intensities and ADC values of necrotic area,non-necrotic area and normal liver were measured and compared.Results: The ADC value of the necrotic areas of liver abscesses (\[0.88±0.09\] mm2/s) was significantly lower than those of normal liver (\[1.31±0.12\] mm2/s,P<0.05) and non-necrotic area of liver abscesses (\[1.43±0.18\] mm2/s,P<0.05); there was also significant difference between the ADC values of the normal liver and non-neocrotic area (P<0.05).The necrotic areas had a hyperintensity characteristic on DWI,T2WI and a hypointensity characteristic on T1WI; no enhancement was found on dynamic enhanced imaging.The non-necrotic areas had moderate hyperintensity on DWI,T2WI and hypointensity on T1WI; there was obvious enhancement on dynamic enhanced imaging.Conclusion: The early liver abscess is characterized on magnetic resonance imaging.The DWI scan is helpful for diagnosis of early liver abscess.
