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目的:探讨磁共振成像（MRI）检查在评估血吸虫病肝纤维化严重程度中的应用效果。方法:采用前瞻性研究，选择2016年12月至2019年12月湖州市第一人民医院收治的50例慢性血吸虫病患者作为观察组，并以同期的35例健康体检者作为对照组，所有受试者均行1.5T MRI平扫及扩散加权成像，设置弥散敏感系数（b值）为600 s/mmn 2。以肝组织活检为金标准，判断肝组织纤维化程度；分析扩散加权成像表观扩散系数（ADC）、指数化表观扩散系数（eADC）与肝纤维化分期的相关性，绘制受试者工作特征曲线（ROC曲线）评价ADC及eADC诊断血吸虫病肝纤维化的价值。n 结果:50例慢性血吸虫病患者中，MRI平扫发现39例患者出现肝叶比例失调、肝裂增宽、肝右叶萎缩、肝左外叶及尾状叶明显增大，门静脉周围纤维化增生导致门静脉壁增厚，有纤维袖口征出现，T1加权像（T1WI）和T2加权像（T2WI）均呈现低信号，但对晚期钙化显示不敏感；其余11例患者无明显的肝叶轮廓改变及比例失调。其中，7例合并肝癌，44例合并胆囊结石、胆囊炎。MRI扩散加权成像检查发现，观察组与对照组ADC[（1.17 ± 0.08）× 10n -3、（1.38 ± 0.13）× 10n -3 mmn 2/s]、eADC值[（0.51 ± 0.07）× 10n -3、（0.40 ± 0.06）× 10n -3 mmn 2/s]比较，差异有统计学意义（n t = 8.497、7.762，n P均< 0.05）；且观察组各肝纤维化分期患者ADC、eADC值比较差异有统计学意义（n F = 21.526、23.814，n P均< 0.05）。相关性分析结果显示，慢性血吸虫病肝纤维化与ADC值呈负相关（n r = - 0.236，n P < 0.05），与eADC值呈正相关（ n r = 0.484，n P < 0.05）。ADC值诊断血吸虫病肝纤维化的ROC曲线下面积（AUC）为0.826，95%置信区间（ n CI）为0.785~0.953，诊断特异性为89.25%，敏感度为79.58%；eADC值诊断血吸虫病肝纤维化的AUC为0.681，95%n CI为0.582~0.879，诊断特异性为81.14%，敏感度为73.81%。ADC、eADC值诊断血吸虫病肝纤维化S2~S4期的AUC均显著高于S0、S1期（n P均 0.05）。n 结论:慢性血吸虫病肝纤维化患者MRI检查中ADC值明显下降，eADC值明显升高；且慢性血吸虫病肝纤维化与ADC、eADC值显著相关。ADC及eADC值对于血吸虫病肝纤维化具有一定诊断价值。“,”Objective:To explore the effect of magnetic resonance imaging (MRI) examination in evaluating the severity of liver fibrosis in schistosomiasis.Methods:A prospective study was carried out to select 50 patients with chronic schistosomiasis admitted to the First People's Hospital of Huzhou City from December 2016 to December 2019 as the observation group, and 35 healthy physical examination subjects during the same period as the control group. All subjects underwent 1.5T MRI scan and diffusion-weighted imaging, and the diffusion sensitivity coefficient (b value) was set to 600 s/mmn 2. Using liver biopsy as the gold standard, the degree of liver fibrosis stage was determined. The correlation between apparent diffusion coefficient (ADC), exponential apparent diffusion coefficient (eADC) of diffusion-weighted imaging and liver fibrosis stage was analyzed. And receiver operating characteristic curve (ROC curve) was drawn to evaluate the diagnostic value of ADC and eADC in liver fibrosis of schistosomiasis.n Results:Among the 50 patients with chronic schistosomiasis, the MRI scan showed that 39 patients presented with liver lobe proportion imbalance, widened liver fissure, atrophy of right lobe of liver, obvious enlargement of the left outer lobe and caudate lobe of liver; hyperfibrosis and hyperplasia around portal vein leaded to thickening of portal vein wall and appearance of fiber cuff sign; both T1WI and T2WI showed low signals but were not sensitive to late calcification; and there was no obvious change of liver lobe contour and proportion imbalance in other 11 patients. Among them, 7 cases were complicated with liver cancer, and 44 cases were complicated with cholecystolithiasis and cholecystitis. The MRI diffusion-weighted imaging showed that there were statistically significant differences in ADC [(1.17 ± 0.08) × 10n -3, (1.38 ± 0.13) × 10n -3 mmn 2/s] and eADC value [(0.51 ± 0.07) × 10n -3, (0.40 ± 0.06) × 10n -3 mmn 2/s] between the observation group and the control group (n t = 8.497, 7.762, n P < 0.05); and the differences in ADC and eADC values of patients in different liver fibrosis stages in the observation group were statistically significant ( n F = 21.526, 23.814, n P < 0.05). Correlation analysis results showed that chronic schistosomiasis liver fibrosis was negatively correlated with ADC value ( n r = - 0.236, n P < 0.05), and positively correlated with eADC value ( n r = 0.484, n P < 0.05). The ADC value for diagnosing of schistosomiasis liver fibrosis with area under ROC curve (AUC) was 0.826, the 95% confidence interval ( n CI) was 0.785 - 0.953, the diagnostic specificity was 89.25%, and the sensitivity was 79.58%; eADC value for diagnosing schistosomiasis liver fibrosis with AUC was 0.681, the 95%n CI was 0.582 - 0.879, the diagnostic specificity was 81.14%, and the sensitivity was 73.81%. The ADC and eADC values diagnosed liver fibrosis in S2 - S4 stages were significantly higher in AUC than those in S0 and S1 stages (n P 0.05).n Conclusions:In MRI examination of patients with chronic schistosomiasis liver fibrosis, ADC values decreases significantly, and eADC values increases significantly; and there is a correlation between chronic schistosomiasis liver fibrosis and ADC and eADC values. The ADC and eADC values have certain diagnostic value for schistosomiasis liver fibrosis.