Hirota Katsuhiko, Tanaka Takuro, Iwata Naoki, Ishikawa Masayori
Shinseikai Central Clinic.
Department of Clinical Radiology, Tottori University Hospital.
Nihon Hoshasen Gijutsu Gakkai Zasshi. 2020;76(8):817-827. doi: 10.6009/jjrt.2020_JSRT_76.8.817.
In recent years, the exposure dose of the operator's eye lens during interventional radiology operations has become a problem. We therefore evaluated the feasibility of real-time lens dose measurement using scintillator with optical fiber (SOF) dosimeter. Given that the SOF dosimeter is calibrated for direct X-rays, we performed a calibration for scattered X-rays to investigate energy dependence and the accuracy of lens dose measurements. The detection limit was calculated using the Kaiser method. The SOF dosimeter and the radiophotoluminescence glass (RPLG) dosimeter were attached to the protective glasses worn by the operator, and the lens exposure dose of the operator during cardiac catheterization was measured. In the phantom experiment, the SOF dosimeter had an error rate of 5.45% based on the measured value of the ionization chamber dosimeter. The sensitivity characteristics of the SOF dosimeter were slightly reduced on the higher side of the effective energy. The difference in sensitivity was related to variations in the additional filter and energy dependency. The sensitivity difference was 18.5% at maximum. Furthermore, when the additional dose was displayed, the influence of noise on long-term measurement was considerable. Using the Kaiser method to obtain the detection limit, the accuracy of the integrated dose had SOF dosimeter error rates of 4.3% to 15.5% with respect to the integrated value of the RPLG dosimeter when calibrated by the ionization chamber dosimeter. The use of the SOF dosimeter allowed for the real-time visualization of the exposure status of the eye lens and measurements with a relatively high accuracy.
近年来，介入放射学操作过程中操作者眼晶状体的照射剂量已成为一个问题。因此，我们评估了使用带光纤闪烁体（SOF）剂量计进行眼晶状体剂量实时测量的可行性。鉴于SOF剂量计是针对直接X射线进行校准的，我们对散射X射线进行了校准，以研究能量依赖性和眼晶状体剂量测量的准确性。使用凯泽方法计算检测限。将SOF剂量计和放射光致发光玻璃（RPLG）剂量计附着在操作者佩戴的防护眼镜上，测量操作者在心脏导管插入术期间的眼晶状体照射剂量。在体模实验中，基于电离室剂量计的测量值，SOF剂量计的误差率为5.45%。SOF剂量计的灵敏度特性在有效能量较高侧略有降低。灵敏度差异与附加滤过器的变化和能量依赖性有关。灵敏度差异最大为18.5%。此外，当显示附加剂量时，噪声对长期测量的影响相当大。使用凯泽方法获得检测限，在校准电离室剂量计时，相对于RPLG剂量计的积分值，SOF剂量计的积分剂量准确度的误差率为4.3%至15.5%。使用SOF剂量计能够实时可视化眼晶状体的照射状态，并进行相对高精度的测量。
