真空袋配合定位体架固定胸部肿瘤病人时上肢位置变化对摆位精度的影响

摘要

Objective: To explore the position change of the setup reference markers on the sternum due to the change of hands grip position. Methods: Six hands grip positions were simulated for 8 patients and the set-up reference points marked on the sternum skin were compared while the hands grasped different positions of the hands. Results: The setup markers on the sternum were deviated by all five hands grip positions. The maximum deviated distance was 14mm. Conclusion: The change of the hands grip position can affect the position of setup reference markers on the sternum of the patients and thus the isocenter of plan may be aligned to the wrong area.%目的:探讨双手握杆位置变化对胸部标记点位置的影响,从而优化放射治疗固定方法并提出对目前市场上商用真空袋之改进建议.方法:模拟8例胸部肿瘤病人放射治疗摆位中双手握杆位置变化的几种场景,测量胸骨皮肤上摆位参考点受牵拉而移动情况.结果:五种双手握杆位置的变化均使胸部摆位标记点产生了偏移,最大偏离直线距离为14mm,在所有测量点中偏离距离大于5 mm者占16.25%.结论:体架固定放疗实践中,病人双手握杆位置的变化对胸骨摆位参考点均有影响,其进一步对治疗中心位移的影响有待深入研究.