中文摘要：

目的探讨MRI和PET—CT对直肠癌术后局部复发的诊断方法及效果。方法对本院于2009年12月～2011年12月收治的50例直肠癌术后患者进行回顾性分析，其中有35例经病理活检确诊为肿瘤复发或转移，对比MRI（对照组）和PET—CT（实验组）检查患者和病灶的诊断结果。结果两组间相比，实验组患者和病灶的灵敏度、特异性和阳性预测值、阴性预测值、准确性均优于对照组，差异均有统计学意义（P〈0．05）。结论运用PET—CT对直肠癌术后局部复发患者进行诊断，能有效改善灵敏度，增强特异性，提高准确性。

英文摘要：

Objective To evaluate the MRI and PET-CT for the diagnosis of local recurrence of rectal cancer methods and results. Methods In our hospital from December 2009 to December 2011,50 cases of rectal cancer treated patients were retrospectively analyzed, of which 35 patients with biopsy confirmed tumor recurrence or metastasis,compared to MRI （control group） and PET-CT （experimental group） to check the diagnosis of patients and lesions. Results Compared between the two groups, experimental group patients and lesions of the sensitivity, specificity and positive predictive value, negative predictive value and accuracy were better than the control group, the differences were statistically significant （P 〈0.05）. Conclusion The use of PET-CT in patients with local recurrence of rectal cancer diagnosis, can effectively improve the sensitivity, specificity enhance and improve accuracy.