在放射诊断中使用 OSL 剂量计估算光子能量：实验验证和蒙特卡罗模拟

IF 1.6 3区物理与天体物理 Q2 NUCLEAR SCIENCE & TECHNOLOGY

Radiation Measurements Pub Date : 2024-11-20 DOI:10.1016/j.radmeas.2024.107342

Bui Ngoc Huy, Pham Van Dung, Huynh Thi Tinh, Nguyen Thi Ha, Nguyen Minh Duc

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引用次数: 0

摘要

使用 EGSnrc Monte Carlo 软件工具包对 InLight XA 光学发光剂量计 (OSLD) 进行能量响应评估，并根据 E3/E4 比率估算光子能量。在 EGSnrc 中构建了 PMMA 模体表面的虚拟 OSLD，确定了剂量计的能量响应和比率 E3/E4，并与物理测量结果进行了比较。模拟、物理测量和微星系统的 E3/E4 比值显示出非常好的一致性，最大差异分别为 9.3% 和 10.94%。此外，由于光电效应，OSLDs 的能量响应在能量低于 100 keV 时变化很大。这项研究的结果确定并解决了 OSLDs 对低能量光子的过度响应问题，提供了校正系数以尽量减少误差，尤其是在放射诊断应用中。这些发现有可能通过提供更精确的光子能量估计来提高患者和放射工作人员的剂量准确性，尤其是在较低能量范围，如诊断 X 射线中。使用 E3/E4 比率评估光子能量的功能对此类算法的准确性有很大影响。它还能确保成像设备针对所需的特定能量范围进行正确校准，从而提高诊断的准确性。此外，精确的剂量测量对于维护监管合规性和长期患者照射记录至关重要，最终可促进更安全、更有效的放射实践。

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Photon energy estimation in diagnostic radiology using OSL dosimeters: Experimental validation and Monte Carlo simulations

The EGSnrc Monte Carlo software toolkit was used to evaluate the energy response and estimate the photon energy based on the E3/E4 ratio for the InLight XA Optical Luminescence Dosimeters (OSLDs).

The InLight XA OSLDs were irradiated with Cs-137 source and ISO 4037-1 narrow-spectrum series X-ray qualities (N40, N60, N80, and N100). The virtual OSLDs on the surface of the PMMA phantom were constructed in EGSnrc, energy response and ratio E3/E4 of the dosimeters was determined and compared to the physical measurements.

Good agreement was found between the simulated and measurement approaches in estimating the photon energy with a percentage difference of less than 6%. The E3/E4 ratio from simulation, physical measurements, and microStar system showed very good agreement results with the maximum difference of 9.3% and 10.94%, respectively. Furthermore, the OSLDs energy response varied significantly at energy below 100 keV due to the photoelectric effect.

The results of this study identify and address the over-response of OSLDs to low-energy photons, offering correction factors to minimize errors, especially in diagnostic radiology applications. These findings have the potential to improve dose accuracy for patients and radiation workers by providing more precise photon energy estimations, particularly at lower energy ranges, such as in diagnostic X-rays. The function used to evaluate photon energy using E3/E4 ratio has a great influence on the accuracy of such algorithms. It also ensures that imaging equipment is properly calibrated for the specific energy ranges needed, enhancing diagnostic accuracy. Furthermore, precise dose measurements are essential for maintaining regulatory compliance and long-term patient exposure records, ultimately promoting safer and more effective radiological practices.

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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.