源皮距辅助对宫颈癌适形放疗摆位误差的影响  

Influence of patient’s SSD on set-up error of 3D conformal radiotherapy for fervical cancer

作　　者：陈苏玮[1] 袁锋[1] 林志仁[1] 王献维[1] 

机构地区：[1]海口市人民医院放疗科,海南海口570208

出　　处：《中国热带医学》2012年第9期1168-1168,F0003,共2页China Tropical Medicine

摘　　要：目的探讨宫颈癌三维适形放疗摆位时用源皮距实时辅助检测是否可以减小误差。方法54例患者分为两组,制定3D-CRT计划,对照组摆位后直接拍摄验证片,辅助组在摆位时利用源皮距检测后再拍摄验证片,两组验证片分别与放疗计划的DRR图像比较,X、Y、Z方向上的误差记为△X、△Y和△Z,三维方向的总误差为D2=△X2+△Y2+△Z2。结果对照组的摆位误差:△X、△Y和△Z为(2.5±2.0)mm、(5.7±3.5)mm和(3.2±2.5)mm,三维方向的总误差为(7.0±3.2)mm;辅助组的摆位误差:△X、△Y和△Z为(1.8±1.6)mm、(3.1±2.3)mm和Z方向(2.3±1.8)mm,三维方向的总误差为(4.3±3.2)mm。两组误差在X、Y、Z方向和三维方向均有明显差异(P<0.01)。结论宫颈癌三维适形放疗时运用源皮距辅助可以减小摆位误差,且实时方便。Objective To investigate the possibility of reduce the sut-up error of 3-dimensional conformal radiotherapy for cervical cancer. Methods The 54 patients were divided into control group given validation pictures on the basis of 3D-CRT plan directly and observation group given validation pictures after observing Patient＇s source-skin distance.The drift between two group＇ s validation pictures and the digital reconstructed radiography（DRR） were compared and noted as X,Y,Z direction of set-up error expressed as △X, △Y and△Z, the total set-up error of 3d direction expressed as D2=△X2＋△Y2＋△Z2 . Results The set-up errors of control group in direction of X,Y and z were（2.5±2.0）mm,（5.7±3.5）mm and （3.2±2.5） mm, the total set-up error of 3d direction was（7.0±3.2）mm; The set-up errors of auxiliary group on X,Y, Z direction were （ 1.8± 1.6）mm,（3.1±2.3）mm and （2.3±1.8）mm, total set-up error of 3d direction was （4.3±3.2）mm. Set-up error of two groups in the X, Y, Z direction and 3 direction were significantly different （P 〈 0.01）. Conclusion The set-up error of 3D conformal radiotherapy for cervical cancer with observation of Patient＇ s source-skin distance auxiliary is convenient and suitable for clinical application.

关 键 词：宫颈癌 三维适形放疗 摆位误差 源皮距 

分 类 号：R737.33[医药卫生—肿瘤]