【摘要】 目的通过CT增强联合小肠造影在直肠癌放疗定位扫描中的应用,评估其对直肠癌术前放疗靶区勾画的精确性的影响。方法对2009年3月至2010年11月淄博市中心医院收治的12例直肠癌患者行平扫和CT增强联合小肠造影定位扫描,传输到Varian Eclipse 6.0三维计划系统,分别勾画靶区。结果 CT增强扫描的GTV、CTV均低于CT平扫,差异有统计学意义(P<0.05);3例CT平扫中将肠管误认为是转移淋巴结,3例行CT增强联合小肠造影扫描后发现CT平扫中未发现的转移淋巴结。结论 CT增强扫描有利于直肠癌原发病灶的显示,小肠造影后小肠容易和淋巴结区分,CT增强联合小肠造影提高了放疗靶区勾画的准确性。更多还原

【Abstract】 Objective To study the influence of enhanced CT with small bowel contrast on precise definition of target volumes of rectal cancer for preoperative radiotherapy.Methods Between March 2009 and November 2010 from Zibo Central Hospital,12 patients with rectal cancer were given CT scan,the images were transmitted to Varian Eclipse 6.0 3D planning system,gross tumor volume(GTV)and clinical tumor volume(CTV)were delineated separately.Results GTV,CTV of enhanced CT scan were lower than the plain scan,the difference was statistically significant(P<0.05).Small bowel were mistaken for metastatic lymph nodes in 3 cases with CT plain scan,metastatic lymph nodes in 3 cases were discovered with enhanced CT which were not found in CT plain scan.Conclusion Enhanced CT is useful in differentiating primary tumor and lymph node,small bowel and lymph node are easier distinguished by small bowel contrast,which improves the accuracy of the target delineation in radiotherapy.更多还原