Wong J H D, Bakhsh M, Cheah Y Y, Jong W L, Khor J S, Ng K H
Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia.
University of Malaya Research Imaging Centre, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia.
Radiat Prot Dosimetry. 2019 Dec 31;187(4):451-460. doi: 10.1093/rpd/ncz186.
This study characterises and evaluates an Al2O3:C-based optically stimulated luminescent dosemeter (OSLD) system, commercially known as the nanoDot™ dosemeter and the InLight® microStar reader, for personal and in vivo dose measurements in diagnostic radiology. The system characteristics, such as dose linearity, reader accuracy, reproducibility, batch homogeneity, energy dependence and signal stability, were explored. The suitability of the nanoDot™ dosemeters was evaluated by measuring the depth dose curve, in vivo dose measurement and image perturbation. The nanoDot™ dosemeters were observed to produce a linear dose with ±2.8% coefficient variation. Significant batch inhomogeneity (8.3%) was observed. A slight energy dependence (±6.1%) was observed between 60 and 140 kVp. The InLight® microStar reader demonstrated good accuracy and a reproducibility of ±2%. The depth dose curve measured using nanoDot™ dosemeters showed slightly lower responses than Monte Carlo simulation results. The total uncertainty for a single dose measurement using this system was 11%, but it could be reduced to 9.2% when energy dependence correction was applied.
本研究对一种基于Al2O3:C的光激发发光剂量计（OSLD）系统进行了特性描述和评估，该系统商业上称为nanoDot™剂量计和InLight® microStar阅读器，用于诊断放射学中的个人和体内剂量测量。研究了该系统的特性，如剂量线性、阅读器准确性、可重复性、批次均匀性、能量依赖性和信号稳定性。通过测量深度剂量曲线、体内剂量测量和图像扰动来评估nanoDot™剂量计的适用性。观察到nanoDot™剂量计产生的剂量呈线性，变异系数为±2.8%。观察到显著的批次不均匀性（8.3%）。在60至140 kVp之间观察到轻微的能量依赖性（±6.1%）。InLight® microStar阅读器显示出良好的准确性和±2%的可重复性。使用nanoDot™剂量计测量的深度剂量曲线显示出比蒙特卡罗模拟结果略低的响应。使用该系统进行单次剂量测量的总不确定度为11%，但应用能量依赖性校正后可降至9.2%。
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