在长距离全身辐射中验证Acuros的有效性
Geoffrey Nelson1, Vikren Sarkar1, Martin Szegedi1
1Department of Radiation Oncology, University of Utah, Salt Lake City, Utah, USA.
Journal of applied clinical medical physics
|July 18, 2024
概括
该Acuros算法准确地预测了长距离全身辐射 (TBI) 的辐射剂量. 这确保了精确的肺剂量传递,这对于TBI治疗中的患者安全至关重要.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 剂量测量方法 剂量测量方法
背景情况:
- 准确的剂量报告在全身辐射 (TBI) 中至关重要,特别是在肺部剂量方面.
- 在TBI中,延长源到探测器的距离需要精确的剂量计算算法.
研究的目的:
- 评估Acuros算法在长距离TBI中对剂量预测的准确性.
- 评估算法的性能在各种距离和能量,有或没有肺部阻塞.
主要方法:
- 用6和18 MV光子束进行了剂量计算和测量.
- 组织最大比率 (TMR),输出比率和离轴比率 (OAR) 在长距离 (200-500厘米) 测量.
- 进行了端到端的测试,使用内部和IROC的带有离子室和TLD的人形幽灵.
主要成果:
- 测量和计算的TMR,输出和OAR值达成协议,两种能量均在2%以内.
- 幽灵体内的离子室测量显示,在计算剂量的2%内达成一致.
- 在IROC幻影中TLD测量在计算剂量的5%以内,与TLD不确定性一致.
结论:
- 当Acuros 16.1算法在标准距离下投入使用时,它可以准确计算高达500厘米的剂量.
- 该算法适用于长距离TBI协议的临床实施.
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