诊断用螺旋CT在适形放疗模拟定位中的应用分析  

The Application of Diagnostic Spiral CT in Conformal Radiotherapy Simulative Location and its Impact Factors

作　　者：张国峰[1] 唐焱[1] 徐艳珍[1] 朱海鹏[1] 

机构地区：[1]克拉玛依市中心医院血液肿瘤科,新疆克拉玛依834000

出　　处：《中国医学物理学杂志》2011年第4期2729-2732,共4页Chinese Journal of Medical Physics

摘　　要：目的:分析诊断用螺旋CT用于放疗模拟定位时各种因素对放疗精度的影响,探索降低系统误差、提高放疗几何精确度的方法和措施。方法:在放疗模拟定位过程中,使用诊断用螺旋CT对70例肿瘤患者进行扫描,制定三维治疗计划得到患者正、侧位DDR射野方向照片,在X线模拟定位机下进行对比验证。结果:头颈部肿瘤靶中心点偏差小于3mm,胸部肿瘤、腹部和盆腔肿瘤,靶中心点偏差均小于5 mm。结论:使用诊断用螺旋CT模拟定位时,选择正确的体位固定技术、采用合适的CT扫描参数可以提高的适形放疗的精确度。Objective: To investigate the factors that may impact the accuracy in radiotherapy when diagnostic spiral CT is used in simulative location and discuss the methods for reducing systematic error and improving geometric accuracy of dose delivery.Methods: 70 patients with cancer were scanned by diagnostic spiral CT in simulation.Then we established treatment plan for every patient with Eclipse and created DDRs for each field in the plan.Results: The deviation of target point in head and neck tumor is less than 3 mm,in thorax and abdomen tumor less than 5 mm.Conclusions: Geometric accuracy of dose delivery can be improved by choosing correct body immobilization technology and adopting appropriate CT scanning parameters in simulative location using diagnostic spiral CT.

关 键 词：诊断用螺旋CT 三维适形放疗 靶中心验证 体位固定技术 

分 类 号：R312[医药卫生—基础医学]