Objective To evaluate the differences in contouring of gross tumor volumes (GTV) between different physicians and analyze causes. Methods CT images from patients with nasopharyngeal neoplasms and lung neoplasms were reviewed by 3 radio - therapists and 3 radio diagnosticians with more than 10 years experience. The variability of GTV volume, the maximum value of X axle of layer and coronal section were calculated. The differences of GTV between the two departments were analyzed. Results The volume of GTV by radio - diagnosticians were small er than that by radiotherapists. The radio - diagnosticians were found more accurate in GTV delin eation than radiotherapists, but the variability in GTV delineation of layers and coronal sections of lung neoplasms was not statistically significant. Conclusion More attention should be paid to the variability of GTV delineation by physicians from different departments to improve the level of im age-diagnose in radio-therapists. Advanced image examination approaches and cooperation of ra diation oncologists should be introduced to enhance the accuracy of target region delineation.%目的 了解不同学科医生大体肿瘤靶区(GTV)勾画中产生的差异性,并分析其原因.方法 针对鼻咽癌、肺癌患者的CT定位图像,组织年资10年以上3位放疗科医生、3位影像科医生进行GTV勾画,计算患者GTV的体积、层面及冠状面X轴最大值及其变化范围.结果 影像科医生勾画的肿瘤GTV体积较肿瘤放疗科医生小；影像科医生勾画GTV的精确度及准确性较放疗科医生高；2组医生之间勾画肺癌的GTV层面及冠状面X轴最大值无统计学差异.结论 不同医生对肿瘤GTV勾画存在的差异应引起足够重视,应提高放疗科医生影像诊断水平,引进更先进的影像学检查手段,采用多名医生共同参与的方式来提高靶区勾画的准确性.
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