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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 feasibility of using three-dimensional conformal radiotherapy for cervical cancer with real-time aided detection of source skin distance to reduce the error. Methods Fifty-four patients were divided into two groups to make 3D-CRT plan. In the control group, the verification film was taken directly after setting. The auxiliary group used source skin distance detection before taking the verification film. The two sets of verification films were respectively matched with radiotherapy plan , The errors in the X, Y and Z directions are denoted by ΔX, ΔY and ΔZ, and the total error in the three-dimensional directions is D2 = ΔX2 + ΔY2 + ΔZ2. Results In the control group, the misalignments of △ X, △ Y and △ Z were (2.5 ± 2.0) mm, (5.7 ± 3.5) mm and (3.2 ± 2.5) mm, respectively. The total errors in three dimensions were (7.0 ± 3.2) mm ; The misalignments of auxiliary group were △ X, △ Y and △ Z of (1.8 ± 1.6) mm, (3.1 ± 2.3) mm and Z (2.3 ± 1.8) mm, and the total errors of three- ) mm. The two groups of errors in X, Y, Z direction and three-dimensional directions were significantly different (P <0.01). Conclusion Cervical cancer using three-dimensional conformal radiotherapy source pitch can help reduce the positioning error, and real-time convenience.