摘要
Abstract
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(χ2=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(χ2=45.691,P＜0.05).When the b value was 400 s/mm2 and 800 s/mm2,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.关键词
核磁弥散成像/肝内非肿瘤性病变/图像质量/信号特征/表观弥散系数/灵敏度/特异度Key words
magnetic resonance diffusion imaging/non tumor lesions in the liver/image quality/signal characteristics/apparent dispersion coefficient/sensitivity/specificity
