使用机器学习和统计分析量化瘤大小和运动对4DCT-4DCBCT图像记录准确性的影响
Qiaoyan Jing1, Shuyu Lin1, Binyun Huang1
1Department of Radiation Oncology, Wuming Hospital of Guangxi Medical University, Nanning, People's Republic of China.
Journal of applied clinical medical physics
|February 10, 2026
概括
瘤大小和上下运动显著影响四维CT (4D CT) 和四维CBCT (4D CBCT) 图像之间的注册准确性. 这一发现对于优化图像引导放射治疗策略至关重要.
科学领域:
- 医疗成像医学成像
- 放射治疗 物理 物理
- 计算生物学 计算生物学
背景情况:
- 精确的图像记录对于图像指导放射治疗 (IGRT) 是至关重要的.
- 四维计算机断层扫描 (4D CT) 和四维圆束CT (4D CBCT) 用于治疗规划和治疗.
- 了解影响这些模式之间注册准确性的因素对于提高IGRT精度至关重要.
研究的目的:
- 系统量化呼吸循环,瘤大小和运动幅度 (SI,AP,LR) 对4D CT-4D CBCT注册精度的影响.
- 为增强IGRT中的注册策略提供理论基础.
- 为了确定影响图像注册中的子相似系数 (DSC) 的关键参数.
主要方法:
- 使用一个动态幻影 (CIRS 008A) 与1和3厘米的瘤插入模拟呼吸运动.
- 使用GE Discovery RT CT模拟器和Varian VitalBeam线性加速器获得了4D CT和4D CBCT图像.
- 使用DSC进行了刚性注册并评估了准确性,使用随机森林回归和多因素ANOVA进行分析.
主要成果:
- 随机森林分析显示瘤大小 (0.509) 和SI运动 (0.315) 是对注册准确度最有影响的因素.
- 最大强度预测显示瘤大小有显著影响 (0.722).
- ANOVA证实瘤大小 (p < 0.001) 和SI运动 (p < 0.001) 显著影响了注册质量;呼吸周期和AP/LR运动没有显著意义 (p > 0.05).
结论:
- 4D CT和4D CBCT之间的注册精度受到瘤大小和SI运动幅度的显著影响.
- 具有实质性SI运动 (>10毫米) 的小瘤显示注册准确性明显恶化.
- 结果为优化IGRT注册策略提供了基础,特别是在具有挑战性的案件中.
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