光电二极管读出闪烁光纤放射治疗剂量计
A Scintillating Fiber Dosimeter for Radiology and Brachytherapy with photodiode readout
摘要：
目的：十多年来，基于塑料光纤的剂量计已被开发用于医疗应用。使用几乎不含切伦科夫光的光纤的剂量计的可行性已经在一些原型中得到了证明，特别适用于光子高能束。在高达几百keV的能量范围内，其中由次级电子产生的切伦科夫光可以忽略不计或很小，最大的背景源是荧光机制。研究方法：近年来，我们的小组已经开发出一种名为DosFib的光电二极管读出的光纤剂量计，它在放射学相关的100 keV以下的范围内具有小的能量依赖性。光电二极管是坚固的光电探测器，具有良好的长期稳定性和足够的灵敏度，允许使用静电计作为测量设备，而无需额外的电子设备。结果如下：使用高剂量率192 Ir源的体外试验已证明其适用于使用这一重要放射源的近距离放射治疗应用。衰减曲线已获得在水中与DosFib剂量计和电离室和深度剂量分布是相同的。结论：该剂量计可用于临床剂量测量，与其他剂量计相比具有较好的竞争优势。
英文摘要：
Purpose: For more than a decade that plastic optical fiber based dosimeters have been developed for medical applications. The feasibility of dosimeters using optical fibers that are almost Cherenkov light free has been demonstrated in some prototypes, particularly suitable for photon high-energy beams. In the energy range up to a few hundred keV, where the production of Cherenkov light by secondary electrons is negligible or small, the largest source of background are the fluorescence mechanisms. Methods: In recent years our group has developed an optical fiber dosimeter with photodiode readout named DosFib, which has small energy dependence in the range below 100 keV relevant for radiology. Photodiodes are robust photodetectors, presenting good stability over time and enough sensitivity to allow the use of an electrometer as a measuring device without extra electronics. Results: In-vitro tests using a High Dose Rate 192Ir source have demonstrated its suitability for brachytherapy applications using this important radioactive source. Attenuation curves have been obtained in water with the DosFib dosimeter and an ionization chamber and the depth dose profiles shown to be identical. Conclusions: This new dosimeter can thus be calibrated and used in clinical measurements with good competitive advantages over other dosimeters.
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