一种用于诊断放射学的新型低成本pin光电二极管剂量测定系统的实验分析。

Experimental analysis of a novel and low-cost pin photodiode dosimetry system for diagnostic radiology.

作者信息

Nazififard Mohammad, Suh Kune Y, Mahmoudieh Afshin

机构信息

Department of Energy Systems Engineering, Energy Research Institute, University of Kashan, Kashan, Iran.

Seoul National University, 1 Gwanak Ro, Gwanak Gu, Seoul 151-744, South Korea.

出版信息

Rev Sci Instrum. 2016 Jul;87(7):073502. doi: 10.1063/1.4955170.

DOI:10.1063/1.4955170

PMID:27475554

Abstract

Silicon PIN photodiode has recently found broad and exciting applications in the ionizing radiation dosimetry. In this study a compact and novel dosimetry system using a commercially available PIN photodiode (BPW34) has been experimentally tested for diagnostic radiology. The system was evaluated with clinical beams routinely used for diagnostic radiology and calibrated using a secondary reference standard. Measured dose with PIN photodiode (Air Kerma) varied from 10 to 430 μGy for tube voltages from 40 to 100 kVp and tube current from 0.4 to 40 mAs. The minimum detectable organ dose was estimated to be 10 μGy with 20% uncertainty. Results showed a linear correlation between the PIN photodiode readout and dose measured with standard dosimeters spanning doses received. The present dosimetry system having advantages of suitable sensitivity with immediate readout of dose values, low cost, and portability could be used as an alternative to passive dosimetry system such as thermoluminescent dosimeter for dose measurements in diagnostic radiology.

摘要

硅PIN光电二极管最近在电离辐射剂量测定中得到了广泛而令人兴奋的应用。在本研究中，已对一种使用市售PIN光电二极管（BPW34）的紧凑新颖剂量测定系统进行了诊断放射学的实验测试。该系统使用诊断放射学常规使用的临床射束进行评估，并使用二级参考标准进行校准。对于40至100 kVp的管电压和0.4至40 mAs的管电流，PIN光电二极管测量的剂量（空气比释动能）在10至430 μGy之间变化。估计最小可检测器官剂量为10 μGy，不确定度为20%。结果表明，PIN光电二极管读数与标准剂量计在整个接收剂量范围内测量的剂量之间存在线性相关性。本剂量测定系统具有灵敏度合适、可立即读出剂量值、成本低和便携等优点，可作为被动剂量测定系统（如热释光剂量计）的替代品，用于诊断放射学中的剂量测量。