常见肝脏局灶性病变的低场强MRI诊断与鉴别

Diagnosis and Authentication in Liver Local Disease with Low Power Magnetic Resonance Imaging

目的 探讨肝内常见局灶性病变的低场MRI影像学诊断与鉴别诊断方法。方法 用低场强磁共振常规SE(四回波 )T2 WI结合快速返转恢复序列法 ,以肝脏信号强度作为病灶信号标准 ,将其分为低、等、高信号 ,并以此为基础采用图像分析方法。结果 在常规SE(四回波 )T2 WI(TE =80ms)像中 ,肝细胞癌、肝转移瘤与肝实质相比 ,多呈等、略高信号 ;当TE =110ms时 ,病灶的信号强度与TE =80ms时病灶信号强度相似或有轻度下降 ,边缘模糊 ,信号不均匀 ,而肝血管瘤、肝囊肿、肝脓肿信号随TE时间的延长明显增高 ,边缘清晰锐利 ,呈典型的“灯泡征”。结论 应用各种成像序列可弥补低场MRI腹部成像的不足 。

Objective To study the method of low power magnetic resonance imaging diagnosis and authentication in ordinary liver local diseases.Methods Low power MRI routine SET2WI combined with fast turnover return sequences method were used to divide the signal into low,equal and high signal,and the liver signal power was taken as standard of pathological chages.Graphy analysis method was used on thes basis.Results In routine SET2WI(TE=80ms) graph,liver cell cancer,liver metastatic tumor usually showed equal or lightly high power signal compared to normal liver tissue.When TE was 110ms,signal power of pathological changes was similar to or lightly lower than that of when TE was 80ms,and the signal was uneven.The signal of angiomatosis,liver abscess,liver cysts increased with prolonging of TE time,and showed typical 'bulb symptom'.Conclusion The application of Various of photographic sequences can compensate the shortcoming of low power MRI in abdomenal imaging,and increase the diagnostic accuracy of low power MRI in liver local diseases.