体位真空袋在胸部肿瘤放疗中应用探析.docVIP

体位真空袋在胸部肿瘤放疗中应用探析【摘要】 目的 探讨体位真空袋在胸部肿瘤放疗中的应用。方法 随机抽取实施胸部放疗的患者60例,分成A、B、C三组。每组20例,A组行常规固定技术放疗;B组行体位真空袋固定技术放疗;C组在真空袋固定技术基础上,在患者胸部两侧标记水平参考线。各组均拍摄正、侧位验证片,并每周拍摄验证片与初始验证片相比较。结果 各组在X、Y、Z轴方向的摆位误差结果:A组 X=(5.3±2.8)mm,Y=(3.8±2.3)mm,Z=(6.7±3.3)mm;B组 X=(3.6±1.7)mm,Y=(3.2±1.8)mm,Z=(6.2±2.6)mm ;C组 Z=(3.1±1.6)mm。其中A和B组的X轴数据比较有统计学意义,Y、Z轴则无统计学意义;B和C组的Z轴比较有显著的统计学意义。结论 胸部放疗中,应用体位真空袋固定放疗技术能使X轴误差减少,Y、Z轴无改善。在应用真空袋基础上,在患者胸部皮肤上标记水平参考线能提高精确度,减少摆位误差。 【关键词】胸部放疗;摆位误差;真空袋 Application of Vacuum Pump in Radiation Therapy of Thoracic tumor PAN Qi-yong,TANG Cai-hua,DING Qiu-e,et al.Department of Radiation Oncology,The fifth Affiliated hospital of Sun Yat-Sen University 519000,China 【Abstract】 Objective To investigate the setup errors about application of vacuum pump in radiation therapy for the thoracic tumor.Methods Sixty patients of the thoracic tumor were divided three groups randomly.A group was without vacuum pump.B group was with reference level line on the thoracic skin.The verification films were taken per week from the first week to the end.A and B group in X-axis,Y-axis,Z-axis could be measured and C group were measured in Z-axis only.Results A group set up errors of X-axis,Y-axis,Z-axis were5.3±2.8 mm,3.8±2.3 mm,6.7±3.3 mm.B groups set up errors were 3.6±1.7 mm,3.2±1.8 mm,6.2±2.6 mm.C group set up errors of Z-axis were 3.1±1.6 mm.Conclusion Analysis of setup error in three groups.B group can help to reduce X-axis matched of A group by using vacuum pump.C group by using reference level line can help to reduce Z-axis errors matched with B group. 【Key words】 Radiation therapy;The setup errors;Vacuum pump 放射治疗是肿瘤综合治疗的重要手段之一,大部分恶性肿瘤患者需要接受放射治疗。放射治疗的目的是努力提高治疗增益比,即最大限度地将放射线剂量集中到病变区,杀灭肿瘤细胞而使周围正常组织和器官少受或者免受不必要的照射,以达到最大限度地增加肿瘤局部控制率和减低周围正常组织的放射并发症概率[1]。放疗中多次摆位造成的误差与治疗的增益比存在一定的反向关系。随着摆位误差的增大,放射治疗的增益比会下降。因此,减少体位重复造成的误差,是放疗专业工作者的一项重要任务。本文作者通过三组患者体位固定的应用比较,分析其优点及不足,结果报告如下。 1 材料与方法 1.1 一般资料 收集2008年5月至2010年6月我院放疗科行胸部放疗患者60例,男35例、女25例,年龄21~75岁。患者临床诊断包括中央型肺癌 31例,周围型肺癌12例,食管癌 15例,