Characteristics of real-time radiation exposure dosimetry system using a synthetic ruby for radiotherapy
Characteristics of real-time radiation exposure dosimetry system using a synthetic ruby for radiotherapy
复制标题
实时辐射剂量测定系统的特点
DOI：
10.1007/s12194-022-00691-1
复制
发表时间：
2023
影响因子：
1.6
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
Kenki Matumoto;Yoshiyuki Hosokai;et al.
放射治疗相关的医疗事故通常是由计划问题，放射治疗期间的过度照射或患者移动引起的。这部分是因为在放射治疗期间不能直接监测局部照射剂量。本文讨论了我们最近的实时辐射照射剂量测量系统的发展，该系统使用合成红宝石进行放射治疗。在测量短期特征之前观察到背景噪声。关于光子数和剂量率之间的关系，使用100监测单位（MU）/min作为测量值，在600 MU/min时计数减少约10%。MU值和光子数之间观察到明显的相关性（R2= 0.9987）。在所有照射条件下，变异系数（%CV）均小于± 1.0%。在测量百分比深度剂量时，观察到离子室和合成红宝石剂量计之间存在轻微差异。然而，通过对切伦科夫光进行校正，这种差异几乎可以匹配。虽然观察到一些问题与合成红宝石剂量计系统，我们的研究结果表明，开发的剂量计可用于测量患者的辐射剂量在真实的时间，对数据没有显着的影响，因为任何影响将被掩盖的红宝石的更大的影响，但是，影响需要在未来进行详细的评估。
Radiotherapy-related medical accidents are frequently caused by planning problems, excessive irradiation during radiotherapy, or patient movement. This is partly because the local exposure dose cannot be directly monitored during radiotherapy. This article discusses the development of our recent real-time radiation exposure dosimetry system that uses a synthetic ruby for radiation therapy. Background noise was observed before the measurement of the short-term characteristic features. Regarding the relationship between the number of photons and dose rate, using 100 monitor units (MU)/min as the measurement value, the counts decreased by approximately 10% at 600 MU/min. A clear correlation was observed between the MU value and the number of photons (R2= 0.9987). The coefficient of variation (%CV) was less than ± 1.0% under all the irradiation conditions. Slight differences were observed between the ion chamber and the synthetic ruby dosimeters in the measurement of the percentage depth dose. However, this difference was almost matched by correcting for the Cherenkov light. Although some problems were observed with the synthetic ruby dosimeter system, our results indicate that the developed dosimeter can be used to measure the irradiation dose of patients in real time, with no significant impact on the data, as any effect would be masked by the larger effect of the ruby; however, the impact requires a detailed assessment in the future.