基于碳离子放射治疗中双能计算机断层扫描的核相互作用校正
Yushi Wakisaka1,2, Masashi Yagi3, Yuki Tominaga1,2
1Medical Physics Laboratory, Division of Health Science, Osaka University Graduate School of Medicine, Osaka, Japan.
Physics in medicine and biology
|January 15, 2025
概括
双能计算断层扫描 (DECT) 通过考虑核相互作用,显著提高了碳离子疗法 (CIT) 中的剂量预测准确性. 与传统的单能计算机断层扫描 (SECT) 相比,这种新型应用程序提高了剂量计算.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 放射治疗 物理 物理
背景情况:
- 准确的剂量预测对于优化碳离子疗法 (CIT) 益处至关重要.
- 组织中的核相互作用会导致剂量错误,传统上用单能计算机断层扫描 (SECT) 来纠正.
- 双能计算断层扫描 (DECT) 提供了详细的基本信息,适用于核反应校正.
研究的目的:
- 提出和评估一种基于DECT的新方法来纠正CIT的绝对剂量.
- 为了考虑到核素组成的变化,由于身体组织中的核反应.
- 为了提高碳离子治疗中剂量计算的准确性.
主要方法:
- 确定基于停止功率,质量密度和核相互作用截面的核相互作用校正因子.
- 使用已确定的方法计算制动功率和质量密度.
- 通过从有效原子数中获得的新的转换方程来定义核相互作用截面.
主要成果:
- 为85个身体组织计算的核相互作用校正因子和剂量.
- 与基于SECT的因素 (0.66%) 相比,基于DECT的因素显示出较低的平方根平均误差 (0.39%) 与理论值相比.
- DECT剂量计算与理论值密切匹配,而SECT显示脂肪和骨组织过度纠正.
结论:
- 通过解决核相互作用,DECT显著提高了CIT中剂量估计的准确性.
- 与SECT相比,拟议的DECT方法提供了更好的绝对剂量校正.
- 在碳离子治疗中,DECT显示了提高剂量计算精度的巨大潜力.
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