大格式kV平板系统的蒙特卡洛模型的验证
Nicholas Lowther1, Marios Myronakis1, Thomas Harris1
1Department of Radiation Oncology, Brigham and Women's Hospital, Dana-Farber Cancer Institute, Harvard Medical School, Boston, USA.
Medical physics
|September 2, 2025
概括
一个新的Varian TrueBeam (TB) v4.1 HyperSight升级使用Geant4 Tomographic Emission (GATE) 应用程序进行了物理特征和建模. 蒙特卡洛模型准确地复制了物理测量,支持其在线适应性辐射治疗 (ART) 协议的使用.
科学领域:
- 医学物理
- 放射治疗技术
- 图像分析
背景情况:
- 在线适应性放射治疗 (ART) 需要精确的成像来调整每日剂量.
- 由于大体积和运动,胸部和腹部部位对圆束计算断层扫描 (CBCT) 构成挑战.
- 瓦里安的TrueBeam (TB) v4.1 HyperSight升级旨在通过增强的硬件和软件来改善CBCT的ART.
研究的目的:
- 进行新的Varian TB v4.1 HyperSight成像系统的物理特征.
- 开发和验证升级成像系统硬件的数字蒙特卡罗模型.
主要方法:
- 使用开源的GEANT4 Tomographic Emission (GATE) MC工具包进行CBCT建模.
- 使用供应商规格对所有物理组件进行建模并通过物理测量进行验证.
- 评估的调制传递函数 (MTF),噪声功率频谱 (NPS),散射与原始比率 (SPR) 和空间分辨率.
主要成果:
- 该MC模型与MTF50 (0.901与0.889 mm−1) 和SPR的测量结果高度一致.
- 该模型准确地复制了噪声功率谱的趋势和探测器配置文件.
- 增加门速度并没有降低投影的空间分辨率;焦点运动被准确地建模.
结论:
- 开发的MC模型准确地反映了TB 4.1 HyperSight升级的物理性能.
- 这种经过验证的模型将有助于为具有挑战性的场所开发基于CBCT的在线ART协议.
- 这项研究支持升级系统用于先进的放射治疗.
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