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目的:分析调强放疗的偶然误差及其在临床中的应用。方法:根据在验收时CT-模拟机、加速器和治疗计划系统等国际标准规定的允许误差值,运用误差理论、误差传递及均方根误差的公式,计算出调强放疗全过程中CT-模拟机、加速器上摆位、TPS计划设计和体态运动中的偶然误差。结果:偶然误差是以不可预知的偶然方式变化,是设备性能所决定,是确实存在且无法消除的,存在于整个调强放疗的全过程,其误差在△=±2.55～±4.27mm范围内,均值为3.4mm。结论:临床医生勾画靶区时,必须外放1～2△即3.4～6.8mm的边界范围,胸腹病例可考虑放3△的边界即10.2mm,可以使误差最小,从而避免靶区漏照。
Objective: To analyze the accidental error of intensity modulated radiotherapy and its clinical application. Methods: According to the allowable error values stipulated by international standards such as CT-simulator, accelerator and treatment planning system at the time of acceptance, the formula of error theory, error transfer and root mean square error was used to calculate CT-simulation Machine, accelerometer, TPS program design and body movement in the accidental error. Results: The accidental error is unpredicted by accidental changes in equipment performance is determined, is there and can not be eliminated, exists in the entire IMRT in the whole process, the error in the range of △ = ± 2.55 ~ ± 4.27mm , Mean value is 3.4mm. Conclusion: Clinicians should outline 1 ~ 2 △ or 3.4 ~ 6.8mm outside the target range, chest and abdomen cases can consider the border of 3 △ that is 10.2mm, you can minimize the error, so as to avoid target area leak .