On the correction of lateral response artifact in accelerated radiochromic film dosimetry protocols

IF 1.8 3区物理与天体物理 Q2 NUCLEAR SCIENCE & TECHNOLOGY

Radiation Measurements Pub Date : 2026-02-01 Epub Date: 2025-11-26 DOI:10.1016/j.radmeas.2025.107571

S. Panzuela , A.M. Bruque , J. Macías

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引用次数: 0

Abstract

This study investigates the correction of the lateral response artifact (LRA) in accelerated protocols for radiochromic film dosimetry that shorten the time between irradiation and read-out. In these protocols, the LRA is assessed by pixel profiles along the longest axis of radiochromic film strips that are scanned parallel to the axis of artifact. The interplay between the non-uniform response of flatbed scanners and unavoidable heterogeneities in the radiation fields of linear accelerators modifies these pixel profiles, deviating them from their real behavior. This phenomenon has a negative impact on radiochromic film dosimetry. To solve this issue, first-order variations in the homogeneity of the radiation fields were subtracted from the pixel profiles. We studied dose distributions of 30 × 30 cm² square fields at different dose levels and realistic radiotherapy treatment plans, using 6 MV and 6 MV flattening filter free energies. The radiochromic film models utilized were EBT4 and EBT-XD. For evaluation, gamma analysis (2 %,2 mm) and relative root mean square error metrics were employed. Comparisons against reference measurements demonstrate this novel correction is highly effective in suppressing radiation field heterogeneities, leading to enhanced dosimetric accuracy. Moreover, this study presents a semi-analytical expression for the LRA correction, which contributes to reducing uncertainties.

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加速放射色膜剂量测定方案中侧向响应伪影的校正

本研究探讨了在加速方案中的横向响应伪影（LRA）的校正，以缩短辐照和读出之间的时间。在这些方案中，LRA是通过沿平行于伪影轴扫描的放射变色薄膜条的最长轴的像素轮廓来评估的。平板扫描仪的非均匀响应与线性加速器辐射场中不可避免的异质性之间的相互作用改变了这些像素轮廓，偏离了它们的真实行为。这种现象对放射线致色膜剂量学有不利影响。为了解决这一问题，从像素轮廓中减去辐射场均匀性的一阶变化。利用6 MV和6 MV压平滤波自由能，研究了不同剂量水平下30 × 30 cm2方形场的剂量分布和现实放疗方案。使用的放射变色膜模型为EBT4和EBT-XD。为了评估，采用伽玛分析（2%,2mm）和相对均方根误差指标。与参考测量值的比较表明，这种新的校正在抑制辐射场非均质性方面非常有效，从而提高了剂量学精度。此外，本研究提出了LRA修正的半解析表达式，有助于减少不确定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Radiation Measurements 工程技术-核科学技术

CiteScore

4.10

自引率

20.00%

发文量

116

审稿时长

48 days

期刊介绍： The journal seeks to publish papers that present advances in the following areas: spontaneous and stimulated luminescence (including scintillating materials, thermoluminescence, and optically stimulated luminescence); electron spin resonance of natural and synthetic materials; the physics, design and performance of radiation measurements (including computational modelling such as electronic transport simulations); the novel basic aspects of radiation measurement in medical physics. Studies of energy-transfer phenomena, track physics and microdosimetry are also of interest to the journal. Applications relevant to the journal, particularly where they present novel detection techniques, novel analytical approaches or novel materials, include: personal dosimetry (including dosimetric quantities, active/electronic and passive monitoring techniques for photon, neutron and charged-particle exposures); environmental dosimetry (including methodological advances and predictive models related to radon, but generally excluding local survey results of radon where the main aim is to establish the radiation risk to populations); cosmic and high-energy radiation measurements (including dosimetry, space radiation effects, and single event upsets); dosimetry-based archaeological and Quaternary dating; dosimetry-based approaches to thermochronometry; accident and retrospective dosimetry (including activation detectors), and dosimetry and measurements related to medical applications.