目的分析18F-脱氧葡萄糖(18FFDG)正电子发射计算机体层成像(PET/CT) 在结直肠癌术后患者复发及转移中的临床 应用价值。方法 选取我院行手术治疗结 直肠癌患者，均予以18F-FDG PET/CT与CT 强化检查，以活检病理学结果或者再次手 术作为“金标准”，最终诊断为结直肠癌 患者共80例，比较18F-FDG PET/CT与CT增 强检查对患者术后复发及转移诊断的准确 性、敏感度、特异度。结果 18F-FDG PET/ CT与CT增强扫描对术后复发检查特异度 比较无显著差异(χ2 =2.036，P＞0.05)， 18F-FDG PET/CT准确性(χ2 =5.766，P ＜0.05)、敏感度(χ2 =4.547，P＜0.05) 明显高于CT增强扫描；18F-FDG PET/CT 对术后转移检查特异度(χ2 =6.176， P＜0.05)、准确性(χ2 =13.491，P ＜0.05)、敏感度(χ2 =7.372，P＜0.05) 明显高于CT增强扫描。结论 相较于传统 增强CT，18F-FDG PET/CT对结直肠癌术后 患者复发的诊断具有较高准确性与敏感 度，对术后转移具有较高准确性、特异度 及灵敏度，具有推广价值。

Objective To analyze the clinical value of 18F-deoxyglucose (18F-FDG) positron emission computed tomography (PET/CT) in postoperative recurrence and metastasis of colorectal cancer. Methods A total of 80 patients with colorectal cancer treated by operation in the hospital were examined with 18F-FDG PET/CT and enhanced CT. The diagnostic accuracy, sensitivity and specificity of 18F-FDG PET/CT and enhanced CT examination for postoperative recurrence and metastasis were compared with the results of biopsy and pathology or reoperation as the golden standard. Results There was no significant difference in specificity between 18F-FDG PET/CT and enhanced CT scan for postoperative recurrence (χ2 =2.036, P>0.05). The accuracy (χ2 =5.766, P<0.05) and sensitivity (χ2 =4.547, P<0.05) of 18F-FDG PET/CT were significantly higher than those of enhanced CT scan. The specificity (χ2 =6.176, P<0.05), accuracy (χ2 =13.491, P<0.05) and sensitivity (χ2 =7.372, P<0.05) of 18F-FDG PET/CT for postoperative metastasis were significantly higher than those of enhanced CT scan. Conclusion Compared with the traditional enhanced CT scan, the accuracy and sensitivity of 18F-FDG PET/CT are higher in the diagnosis of postoperative recurrence of colorectal cancer, and the accuracy, specificity and sensitivity are higher for postoperative metastasis.