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目的对比放射治疗两种肺组织轮廓勾画方式的相关数据,探讨正确的肺体积勾画方法。方法 200例单侧肺癌,依据ICRU62号报告勾画每例患者的GTV、CTV、PTV,然后用两种不同的方法勾画肺组织,方法Ⅰ是将GTV(CT影像下的可见肿块)外勾画为肺组织;方法Ⅱ是将PTV外勾画为肺组织,而PTV与GTV之间剔除。分析两种方法各自的肺体积绝对值、V20均值、Dmean均值。结果方法Ⅰ比方法Ⅱ的各数据均明显增高(P<0.01)。结论两种方法统计出的肺组织体积有明显差异,根据肺的生理功能,可认为肺体积范围的勾画应是GTV(可见肿瘤)以外的所有肺组织。
OBJECTIVE: To compare the radiographic data of two lung tissue contouring methods and explore the correct lung volume mapping method. Methods One hundred and twenty-two patients with unilateral lung cancer were divided into GTV, CTV and PTV according to ICRU62 report, and then lung tissue was outlined by two different methods. Method I was to outline GTV (visible mass under CT image) as lung Tissue; method II is to outline the PTV outside the lung tissue, and PTV and GTV removed. The absolute lung volume, V20 mean and Dmean mean of the two methods were analyzed. Results The data of method Ⅰ was significantly higher than that of method Ⅱ (P <0.01). Conclusions There is a significant difference in lung tissue volume between the two methods. According to the physiological function of the lung, it is considered that the outline of the lung volume range should be all lung tissues other than GTV (visible tumor).