18F-FDG PET/CT与PET/MRI在结直肠癌肝转移诊断中的比较分析

目的:比较 18F-氟脱氧葡萄糖（FDG） PET/CT与PET/MRI显像对结直肠癌肝转移的诊断价值。 方法:回顾性分析2018年9月至2019年9月于宁波明州医院行全身 18F-FDG PET/CT显像及上腹部 18F-FDG PET/MRI显像，并疑似有结直肠癌肝转移...

Comparative analysis of 18F-FDG PET/CT and PET/MRI in the diagnosis of colorectal cancer liver metastases

Objective To compare the diagnostic values of 18F-fluorodeoxyglucose (FDG) PET/CT and PET/MRI in colorectal cancer liver metastases. Methods A retrospective analysis was performed on data collected from 27 patients with suspected colorectal cancer liver metastases, including 19 males and 8 females aged 28–78 (60.6±12.2) years old who underwent whole-body 18F-FDG PET/CT and upper abdomen 18F-FDG PET/MRI examination in Ningbo Mingzhou Hospital from September 2018 to September 2019. The result of histopathological examination and imaging follow-up served as the reference standards. The sensitivity, specificity, accuracy, positive predictive value (PPV) and negative predictive value (NPV) of both methods in the diagnosis of liver metastases were calculated. Liver metastases lesions were divided into three groups according to size: lesion length≤1 cm, 1 cm< lesion length≤2 cm, and lesion length>2 cm. The sensitivity of 18F-FDG PET/CT and PET/MRI in each group were calculated. McNemar test was used to compare the sensitivity, specificity, and accuracy of the two methods in the diagnosis of liver metastases. χ2 test was used to compare the PPV and NPV of the two methods in the diagnosis of liver metastases. Results Based on 27 patients with colorectal cancer analysis, the sensitivity and accuracy of 18F-FDG PET/MRI in the diagnosis of liver metastases (94% (15/16) and 96% (26/27)) were higher than those of PET/CT (81% (13/16) and 89% (24/27)), but the difference was not statistically significant (McNemar test, both P>0.05). Based on lesion analysis, mong the 118 liver lesions found in the 27 patients, 72 lesions were liver metastases and 46 lesions were benign liver lesions. The sensitivity, accuracy, and NPV of 18F-FDG PET/MRI in the diagnosis of liver metastases (85% (61/72), 91% (107/118) and 81% (46/57)) were significantly higher than those of PET/CT (63% (45/72), 76% (90/118) and 63% (45/72); McNemar test, χ2=5.072, all P<0.05). The sensitivity of 18F-FDG PET/MRI (63% (17/27)) for lesions with length≤1 cm was significantly higher than that of PET/CT (7% (2/27); McNemar test, P<0.05). Conclusion Compared with 18F-FDG PET/CT, 18F-FDG PET/MRI has higher diagnostic value in colorectal cancer liver metastases, especially for lesion with length≤1 cm.