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Conversion coefficients for determination of dispersed photon dose during radiotherapy: NRUrad input code for MCNP

机译:用于确定放疗过程中分散光子剂量的转换系数:MCNP的NRUrad输入代码

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摘要

Radiotherapy is a common cancer treatment module, where a certain amount of dose will be delivered to the targeted organ. This is achieved usually by photons generated by linear accelerator units. However, radiation scattering within the patient’s body and the surrounding environment will lead to dose dispersion to healthy tissues which are not targets of the primary radiation. Determination of the dispersed dose would be important for assessing the risk and biological consequences in different organs or tissues. In the present work, the concept of conversion coefficient (F) of the dispersed dose was developed, in which F = (Dd/Dt), where Dd was the dispersed dose in a non-targeted tissue and Dt is the absorbed dose in the targeted tissue. To quantify Dd and Dt, a comprehensive model was developed using the Monte Carlo N-Particle (MCNP) package to simulate the linear accelerator head, the human phantom, the treatment couch and the radiotherapy treatment room. The present work also demonstrated the feasibility and power of parallel computing through the use of the Message Passing Interface (MPI) version of MCNP5.
机译:放射疗法是常见的癌症治疗模块,其中一定量的剂量将被输送到目标器官。这通常是通过线性加速器单元产生的光子来实现的。但是,辐射在患者体内和周围环境中的散射会导致剂量分散到健康组织,而健康组织不是主要辐射的目标。确定分散剂量对于评估不同器官或组织中的风险和生物学后果非常重要。在本工作中,提出了分散剂量的转换系数(F)的概念,其中F =(Dd / Dt),其中Dd是非目标组织中的分散剂量,Dt是在非目标组织中的吸收剂量。靶向组织。为了量化Dd和Dt,使用Monte Carlo N-Particle(MCNP)软件包开发了一个综合模型,以模拟线性加速器头,人体模型,治疗床和放射治疗室。本工作还通过使用消息传递接口(MPI)版本的MCNP5演示了并行计算的可行性和功能。

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