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在CBCT指导放射治疗中用于可变形图像注册的局部刚性约束
Tom J W Draper1, Cornel Zachiu1, Bas W Raaymakers1
1Department of Radiotherapy, UMC Utrecht, Heidelberglaan, CX, The Netherlands.
Medical physics
|November 8, 2025
概括
这项研究引入了可变形图像注册 (DIR) 的新框架,该框架使用局部刚性约束来提高适应性放射治疗的准确性. 该方法提高了解剖学一致性和运动估计,而不会显著增加计算时间.
科学领域:
- 医疗成像医学成像
- 辐射疗法 辐射疗法
- 计算解剖学的计算解剖学
背景情况:
- 可变形图像注册 (DIR) 对于放射治疗规划和质量保证至关重要.
- 传统的DIR方法缺乏组织特异性的生物力学特性,导致解剖学不可信.
- 需要空间变化的模型来提高DIR的解剖学一致性.
研究的目的:
- 引入DIR的轻量化框架,包括局部刚性约束.
- 提高解剖学一致性和运动估计准确度.
- 确保计算效率和与现有DIR管道的兼容性.
主要方法:
- 共同优化刚体转变和周围组织变形.
- 在57个带有注释的地标的骨盆CT-CBCT图像对上进行评估.
- 在细分骨 (圣骨,部,大腿骨) 和胸部结构上施加局部刚性约束.
主要成果:
- 约束方法改善了地标对齐,更多的病例低于3毫米的平均TRE.
- 显著减少了刚性骨头的非物理变形,通过雅可比分析验证.
- 显示胸部结构与肺部TRE边际增加的改善对齐;运行时间增加了最大40秒.
结论:
- 拟议的框架通过使用局部刚性约束来提高DIR准确性和解剖学可靠性.
- 它有效地消除了刚性结构中的解剖学上不可思议的变形.
- 该方法是高效的,适合于CBCT引导的适应性放射治疗.
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