一种实用设计的塑料闪烁板剂量计的特性。

Medical physics Pub Date : 2025-05-31 DOI:10.1002/mp.17904
Takeshi Ohta, Yuki Nozawa, Shingo Ohira, Kanabu Nawa, Hideomi Yamashita, Keiichi Nakagawa
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引用次数: 0

摘要

背景:放疗技术的进步使得高清晰度放疗的使用成为可能,从而在临床环境中实现更精确和精细调整的治疗。然而,在临床实践中,获得高分辨率、广泛的测量区域和剂量分布测量的可重复性一直是挑战,因此通常需要多种剂量测定系统来克服测量限制。因此,迫切需要开发一种既能提供高分辨率又能重复使用的剂量计。目的:设计了一种实用的闪烁板剂量计,并利用直线加速器的x射线光束对其剂量特性进行了评价。方法:将0.2 cm厚的闪烁板夹在一对2.0 cm厚的聚甲基丙烯酸甲酯(PMMA)板之间,制成实用的闪烁板剂量计。利用互补金属氧化物半导体(CMOS)相机,对x射线射向闪烁板时发出的闪烁光进行检测。在6 MV下进行测量,以测试剂量的线性、重现性以及与相机温度和入射角的关系。使用6 MV和10 MV无压扁滤波器(FFF)光束也测量了剂量率依赖性。使用4毫伏、6毫伏、10毫伏、6毫伏FFF和10毫伏FFF光束进一步测试x射线的能量依赖性。结果:在10 ~ 1000 μ m范围内,最大线性误差为0.4%。切伦科夫光去除后,剂量重现性的变异系数为±0.062%,温度依赖性为0.07%/°C,角度变化在±1.3%以内。与6mv FFF波束在1300 MU/min时相比,45 MU/min时的剂量输出下降了5.0%;与10mv FFF波束在1900 MU/min时相比,160 MU/min时的剂量输出下降了2.0%。x射线能量的依赖范围为-2.1% ~ +1.4%。结论:实用闪烁板剂量计具有良好的剂量特性,可用于体积调制电弧治疗的患者特异性质量保证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterization of a practically designed plastic scintillation plate dosimeter.

Background: Advancements in radiotherapy have enabled the use of high-definition irradiation, leading to more precise and finely adjusted treatments in clinical settings. Nevertheless, the attainment of high resolution, an extensive measurement area, and the repeatability of dose distribution measurements persist as challenges in clinical practice, thereby often requiring multiple dosimetry systems to overcome measurement constraints. Consequently, there is a significant need to develop a dosimeter that offers both a high resolution and a capability for repeated use.

Purpose: A practical scintillation plate dosimeter was designed and its dosimetric characteristics were evaluated using x-ray beams from a linear accelerator.

Methods: A practical scintillation plate dosimeter comprised a 0.2 cm-thick scintillation plate sandwiched between a pair of 2.0 cm-thick Polymethyl methacrylate (PMMA) plates. A Complementary Metal Oxide Semiconductor (CMOS) camera was used to detect the scintillation light emitted from the scintillation plate when the x-ray beams were delivered to the plate. Measurements were made at 6 MV to test the dose linearity, reproducibility, and dependencies on the camera temperature and angles of incidence. The dose-rate dependency was also measured using 6 and 10 MV flattening filter-free (FFF) beams. The x-ray energy dependency was further tested using 4 MV, 6 MV, 10 MV, 6 MV FFF, and 10 MV FFF beams.

Results: A maximum linearity error of 0.4% was observed for doses ranging from 10 to 1000 MU. The coefficient of variation for the dose reproducibility was ± 0.062%, the temperature dependency was 0.07%/°C, and the angular variations were within ± 1.3% after the removal of Cherenkov light. The dose output decreased by 5.0% at 45 MU/min, compared with that at 1300 MU/min with the 6 MV FFF beams, and by 2.0% at 160 MU/min, compared to 1900 MU/min with the 10 MV FFF beams. The dependency of x-ray energy ranged from -2.1% to +1.4%.

Conclusions: The practical scintillation plate dosimeter showed favorable dose characteristics that can be applied in patient-specific quality assurance for volumetric modulated arc therapy.

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