核磁弥散成像及ADC值在肝内非肿瘤性病变诊断与鉴别诊断中的价值

The value of diffusion weighted imaging and ADC value in the diagnosis and differential diagnosis of non neoplastic liver lesions

目的探讨与分析核磁弥散成像(DWI)及表观弥散系数(ADC)值在肝内非肿瘤性病变诊断与鉴别诊断中的价值。方法选择2020年8月—2023年5月厦门大学附属第一医院收治的120例肝脏占位性病变患者为研究对象,所有患者均给予常规MRI与DWI,记录图像质量、信号特征,计算ADC值,评价诊断效能。结果120例患者中,病理诊断为肝内非肿瘤性病变70例(非肿瘤组:肝脓肿32例、肝囊肿28例、肝炎性假瘤10例),肝内肿瘤性病变50例(肿瘤组:肝血管瘤38例,肝癌12例)。非肿瘤组与肿瘤组的图像质量优良率分别为94.29%(66/70)与88.00%(44/50),组间比较差异无统计学意义(χ^(2)=1.509,P>0.05)。非肿瘤组的磁共振信号特征多为高信号(62.86%),肿瘤组多为低信号(60.00%),两组比较差异有统计学意义(χ^(2)=45.691,P<0.05)。在b值为400 s/mm^(2)和800 s/mm^(2)条件下,非肿瘤组的ADC值(0.84±0.17、0.77±0.14)均低于肿瘤组(1.29±0.24、1.19±0.34),差异有统计学意义(t=12.029、9.302,P<0.05)。DWI判断为肝内非肿瘤性病变68例,DWI在肝内非肿瘤性病变的鉴别诊断灵敏度与特异度分别为95.71%(67/70)和98.00%(49/50),ROC曲线显示DWI在肝内非肿瘤性病变的诊断曲线下面积为0.895。结论DWI在肝内非肿瘤性病变中的图像显示质量高,可通过信号特征与ADC判断病灶状况,对鉴别肝内非肿瘤性病变具有较高的诊断效能。

Objective To investigate and analyze the value of diffusion weighted imaging(DWI)and apparent diffusion coefficient(ADC)in the diagnosis and differential diagnosis of non neoplastic liver lesions.Methods A total of 120 patients with liver focal lesions admitted to the First Affiliated Hospital of Xiamen University from August 2020 to may 2023 were selected.All patients were given conventional MRI and DWI,the image quality and signal characteristics were recorded,the ADC value was calculated,and the diagnostic efficiency was evaluated.Results Among the 120 patients,70 cases were pathologically diagnosed as non neoplastic lesions(non tumor group,32 cases of liver abscess,28 cases of liver cyst,10 cases of hepatitis pseudotumor),and 50 cases were neoplastic lesions(tumor group,38 cases of hepatic hemangioma,12 cases of liver cancer).The excellent and good image quality rates of non tumor group and tumor group were 94.29%(66/70)and 88.00%(44/50),respectively,and there was no significant difference between the two groups(χ^(2)=1.509,P>0.05).The MRI signal characteristics of non tumor group were mostly high signal(62.86%),while the tumor group were mostly low signal(60.00%),and the difference between the two groups was statistically significant(χ^(2)=45.691,P<0.05).When the b value was 400 s/mm^(2) and 800 s/mm^(2),the ADC value of non tumor group(0.84±0.17,0.77±0.14)was significantly lower than that of tumor group.The difference was statistically significant(t=12.029,9.302,P<0.05).Sixty-eight patients were diagnosed as non neoplastic lesions by DWI.The sensitivity and specificity of DWI in the differential diagnosis of non neoplastic lesions were 95.71%(67/70)and 98.00%(49/50),respectively.The ROC curve shows that the area under the diagnostic curve of DWI for non tumor lesions in the liver was 0.895.Conclusions DWI has high image quality in the diagnosis of non neoplastic lesions in the liver.Doctors can judge the status of lesions by signal characteristics and ADC,which has high diagnostic efficiency in the identification of non neoplastic lesions in the liver.