基于PRIMO-penEasy蒙特卡罗的6毫伏光子束小场剂量学评价

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry Pub Date : 2025-05-12 DOI:10.1016/j.radphyschem.2025.112904

Nataly Díaz , Amaia Villa Abaunza , Jorge Muñoz , José Manuel Udías , Paula Ibáñez

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引用次数: 0

摘要

小范围临床放疗计划的剂量学验证需要高精度仪器以确保准确性和空间分辨率。本研究提出了PRIMO和penEasy蒙特卡罗模拟器的组合，以解决直接测量不切实际，具有挑战性或由于探测器限制而产生不一致结果的情况。

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Dosimetric evaluation of 6 MV photon beams in small fields using PRIMO-penEasy Monte Carlo

Dosimetric validation of clinical radiotherapy plans for small fields requires high-precision instrumentation to ensure accuracy and spatial resolution. This study proposes a combination of PRIMO and penEasy Monte Carlo simulators to address scenarios where direct measurements are impractical, challenging, or yield inconsistent results due to detector limitations.

We compared three dosimetric tools: A Semiflex ionization chamber PTW (model 31010) within a water-filled acrylic tank; EBT3 radiochromic films positioned between solid water layers; and PRIMO-PenEasy simulations. Experiments were performed at San Ignacio University Hospital in Bogota, Colombia, with dose measurements in two small fields and one conventional field for an Axesse-type linear accelerator.

Results indicate that EBT3 radiochromic film show better agreement with MC simulation than the Semiflex ionization chamber, likely due to the chamber dose averaging effect across its detection volume. Additionally, variations in off-axis ratios were noted in both crossplane and inplane directions with more pronounced discrepancies observed in small fields compared to the conventional field. Overall, PRIMO-PenEasy MC simulations demonstrated accurate dose distributions and can be used as a viable for dosimetric validation in small photon fields.

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来源期刊

Radiation Physics and Chemistry 化学-核科学技术

CiteScore

5.60

自引率

17.20%

发文量

574

审稿时长

12 weeks

期刊介绍： Radiation Physics and Chemistry is a multidisciplinary journal that provides a medium for publication of substantial and original papers, reviews, and short communications which focus on research and developments involving ionizing radiation in radiation physics, radiation chemistry and radiation processing. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. This could include papers that are very similar to previous publications, only with changed target substrates, employed materials, analyzed sites and experimental methods, report results without presenting new insights and/or hypothesis testing, or do not focus on the radiation effects.