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开发TOPAS蒙特卡洛 (MC) 模型扩展,以模拟C臂CBCT的自动曝光控制功能

Nina McWilliams¹, Joseph Perl², Jackie McCavana¹

¹Department of Medical Physics and Clinical Engineering, St Vincent's University Hospital, Dublin, Ireland; UCD Centre for Physics in Health and Medicine, School of Physics, University College Dublin, Dublin 4, Ireland.

Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)

|August 28, 2024

概括

一个新的AECScorer工具准确地模拟C臂形光束CT (CBCT) 系统中的自动曝光控制. 这有助于通过模拟剂量传递来改善蒙特卡洛模拟,从而实现精确的患者剂量测量.

科学领域:

医学物理医学物理
放射性成像学成像学
计算剂量计计算剂量计.

背景情况:

在C臂圆束CT (CBCT) 中精确的器官剂量模拟对于个性化的患者剂量测量至关重要.
系统复杂性,包括自动曝光控制 (AEC) 和DICOM图像集成,对蒙特卡洛 (MC) 剂量计模型构成挑战.

研究的目的:

开发一个模拟C臂CBCT系统中AEC操作的模型.
通过通过mA调制保持恒定的探测器剂量来促进更准确的MC剂量计模型.

主要方法:

在TOPAS (PArticle模拟工具) 中建模了一个西门子Artis Q干预放射C臂系统.
开发了一个新的AECScorer值得分器来模拟AEC功能.
使用CTDI幻影,人形幻影和患者DICOM数据集进行MC模拟.

主要成果:

通过AECScorer,可以在TOPAS中模拟AEC系统.
通过调整每个投影的模拟历史记录,成功地对幻象和DICOM数据集的探测器剂量进行了均等.
已证明适用于其他具有AEC的医疗成像系统.

结论:

在TOPAS中引入了一个新的值得分器 (AECScorer),用于C臂CBCT.
在CBCT剂量计中,AECScorer是系统,患者和协议特定剂量估计的基本步骤.

关键词:

自动曝光控制 (AEC) 系统圆束CT CT 圆束蒙特卡洛模拟的蒙特卡洛模拟用于PArticle模拟的工具 (TOPAS)

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