中华放射肿瘤学杂志
中華放射腫瘤學雜誌
중화방사종류학잡지
CHINESE JOURNAL OF RADIATION ONCOLOGY
2011年
4期
282-285
,共4页
梁军%李明辉%陈东福%吕纪马%欧广飞%惠周光%符贵山%章众%郑容%戴建荣%王绿化
樑軍%李明輝%陳東福%呂紀馬%歐廣飛%惠週光%符貴山%章衆%鄭容%戴建榮%王綠化
량군%리명휘%진동복%려기마%구엄비%혜주광%부귀산%장음%정용%대건영%왕녹화
肺肿瘤/放射疗法%大体肿瘤体积%临床靶体积%系统误差
肺腫瘤/放射療法%大體腫瘤體積%臨床靶體積%繫統誤差
폐종류/방사요법%대체종류체적%림상파체적%계통오차
Lung neoplasms/radiotherapy%Gross tumor volume%Clinical target volume%System error
目的 研究医生在PET-CT图像上对勾画肺癌大体肿瘤体积(GTV)和临床靶体积(CTV)的影响.方法 选取10例2008-2009年间PET-CT定位的肺癌患者,由本科胸组4位主任医生和副主任医生各自独立确定其GTV、CTV.比较每位患者GTV、CTV的平均值、最大值/最小值、变异系数(标准差/平均值);同时比较CTV外轮廓边界位置并计算其系统误差.结果 GTV、CTV最大值与最小值比的平均值分别为1.66、1.65,变异系数分别为0.20、0.17,体积差异较大原因主要为同侧肺门和纵隔淋巴结区域不同.CTV头脚方向与左右、前后方向系统误差分别为0.48 cm与0.37、0.32 cm (F=0.40、0.60、0.15,P=0.755、0.618、0.928).结论 不同放疗科医生在肺癌患者PET-CT定位图像上定义靶区存在差异,GTV、CTV最大值与最小值比的平均值均在1.7以下,差异较大主要原因为位于肺门或纵隔淋巴结区域.CTV头脚方向系统误差较左右和前后方向稍大但均<5 mm.
目的 研究醫生在PET-CT圖像上對勾畫肺癌大體腫瘤體積(GTV)和臨床靶體積(CTV)的影響.方法 選取10例2008-2009年間PET-CT定位的肺癌患者,由本科胸組4位主任醫生和副主任醫生各自獨立確定其GTV、CTV.比較每位患者GTV、CTV的平均值、最大值/最小值、變異繫數(標準差/平均值);同時比較CTV外輪廓邊界位置併計算其繫統誤差.結果 GTV、CTV最大值與最小值比的平均值分彆為1.66、1.65,變異繫數分彆為0.20、0.17,體積差異較大原因主要為同側肺門和縱隔淋巴結區域不同.CTV頭腳方嚮與左右、前後方嚮繫統誤差分彆為0.48 cm與0.37、0.32 cm (F=0.40、0.60、0.15,P=0.755、0.618、0.928).結論 不同放療科醫生在肺癌患者PET-CT定位圖像上定義靶區存在差異,GTV、CTV最大值與最小值比的平均值均在1.7以下,差異較大主要原因為位于肺門或縱隔淋巴結區域.CTV頭腳方嚮繫統誤差較左右和前後方嚮稍大但均<5 mm.
목적 연구의생재PET-CT도상상대구화폐암대체종류체적(GTV)화림상파체적(CTV)적영향.방법 선취10례2008-2009년간PET-CT정위적폐암환자,유본과흉조4위주임의생화부주임의생각자독립학정기GTV、CTV.비교매위환자GTV、CTV적평균치、최대치/최소치、변이계수(표준차/평균치);동시비교CTV외륜곽변계위치병계산기계통오차.결과 GTV、CTV최대치여최소치비적평균치분별위1.66、1.65,변이계수분별위0.20、0.17,체적차이교대원인주요위동측폐문화종격림파결구역불동.CTV두각방향여좌우、전후방향계통오차분별위0.48 cm여0.37、0.32 cm (F=0.40、0.60、0.15,P=0.755、0.618、0.928).결론 불동방료과의생재폐암환자PET-CT정위도상상정의파구존재차이,GTV、CTV최대치여최소치비적평균치균재1.7이하,차이교대주요원인위위우폐문혹종격림파결구역.CTV두각방향계통오차교좌우화전후방향초대단균<5 mm.
Objective To study the variation of gross tumor volume (GTV) and clinical target volume (CTV) definition for lung cancer between different doctors.Methods Ten lung cancer patients with PET-CT simulation were selected from January 2008 to December 2009.GTV and CTV of these patients were defined by four professors or associate professors of radiotherapy independently.Results The mean ratios of largest to smallest GTV and CTV were 1.66 and 1.65, respectively.The mean coefficients of variation for GTV and CTV were 0.20 and 0.17, respectively.System errors of CTV definition in three dimension were less than 5 mm, which was the largest in inferior and superior (0.48 cm,0.37 cm,0.32 cm;F=0.40,0.60,0.15,P=0.755,0.618,0.928).Conclusions The variation of GTV and CTV definition for lung cancer between different doctors exist.The mean ratios of largest to smallest GTV and CTV were less than 1.7.The variation was in hilar and mediastinum lymphanode regions.System error of CTV definition was the largest (<5 mm) in cranio-caudal direction.
