肝脏海绵状血管瘤的DWI及ADC值特征分析

目的 总结分析肝脏海绵状血管瘤（HCH）的DWI图像、ADC值特点.方法 采用1.5T超导磁共振成像系统对39例肝血管瘤患者行DWI（b=0、400、800 s/mm2）并分析DWI图像特点；拟合出ADC图,选取感兴趣区（ROI）,测出ADC值并进行量化分析.结果 HCH于各b值DWI均表现为明显高信号,其ADC值为（b值差800 s/mm2） （2.49±0.43）×10-3mm2/s,高于正常肝组织,并随b值增加其ADC值下降.ROC曲线图示当ADC值≥1.26×10-3 mm2/s时,诊断HCH的灵敏度为96.7％,特异度为86.0％（b值差为800 s/mm2）.结论 HCH的DWI及ADC值具有一定特征性,高于正常肝组织.

Features of Hepatic Cavernous Hemangioma on MRI Diffusion Weighted Imaging and Apparent Diffusion Coefficient

Objective To summarize the features of hepatic cavernous hemangioma （HCH） on the MRI diffusion weighted imaging （DWI） and apparent diffusion coefficient （ADC）. Methods 1.5T super conducting MRI system was used to examine 39 cases of HCH patients by DWI and conventional MRI. The DWI image features were analyzed and the ADC values were measured. Results HCH showed high signal in the DWI, the ADC value was （2.49 ± 0.43） ×10^3 mm2/s. The ADC value of HCH was higher than that of normal liver. The amplitude in the ADC value decreased with the increased b value of riCH. Figure of ROC showed that when the ADC value exceeded 1.26×10^3 2/S, the sensitivity of diagnosis for HCH was 96.7%, and the specificity was 86.0%. Conclusions There are some characteristics of HCH on DWI and quantization of ADC values, and the ADC values are higher than normal liver.