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建立基于RT-PHITS的实用方法来评估个别患者的同效剂量

Tatsuhiko Sato^1,2, Takuya Furuta³, Hidetaka Sasaki⁴

¹Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Shirakata 2-4, Tokai, Ibaraki, 319-1195, Japan. sato.tatsuhiko@jaea.go.jp.

|March 27, 2025

概括

基于PHITS (RT-PHITS) 的改进的放射疗法包与EXPORT-PHITS增强了针对性放射性核素治疗 (TRT) 的剂量测量. 它准确地计算了吸收和同效剂量 (EQDX),特别是对于α射线发射器.

科学领域:

医学物理医学物理
放射治疗剂量计放射治疗剂量计
核医学是一种核医学.

背景情况:

基于PHITS (RT-PHITS) 的放射治疗套件是针对向放射性核素疗法 (TRT) 和外部放射治疗的已建立的个体剂量测量系统.
精确的剂量测量对于优化TRT和外部放射治疗治疗至关重要.
现有的方法需要改进,以便全面评估剂量.

研究的目的:

通过加强RT-PHITS系统,建立一个评估吸收剂量和等效剂量 (EQDX) 的实用方法.
开发一种易于使用的工具,用于将剂量速率转换为吸收剂量和EQDX.
评估EQDX对不同微量对称运动模型的依赖性.

主要方法:

开发ExPORT-PHITS,这是一个基于Excel的剂量转换程序.
在ExPORT-PHITS中实施两种微剂量对称运动模型,用于EQDX评估.
使用SPECT/CT图像对两名用223RaCl2和99mTc-MDP治疗的抵抗割的前列腺癌患者进行验证.

主要成果:

RT-PHITS与IDAC剂量2.1和MIRDcalc对吸收剂量的合理一致.
与其他研究相比,在223RaCl2给药后,正常器官吸收的剂量较高.
对于223RaCl2,EQD2值超过了吸收剂量和RBE加权剂量,对99mTc-MDP观察到相反的情况.

结论:

改进的RT-PHITS,包括出口-PHITS,为个人TRT提供了准确的建模.
该系统对于涉及阿尔法射线发射器的治疗特别有价值.
这种方法有助于优化TRT,提供精确的吸收剂量和EQDX计算.

关键词:

EQDXX EQDX EQDXX EQDXX EQDX EQDX EQDX EQDX EQDX EQDX 个人剂量测量系统的个人剂量测量系统.蒙特卡罗的蒙特卡罗是一个非常好的城市.菲特斯 (Phits) 是一个虚拟的东西.有针对性的阿尔法疗法

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