Development of Novel Real-Time Radiation Systems Using 4-Channel Sensors
Development of Novel Real-Time Radiation Systems Using 4-Channel Sensors
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DOI：
10.3390/s20092741
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发表时间：
2020-05-01
期刊：
影响因子：
3.9
通讯作者：
Chida, Koichi
中科院分区：
文献类型：
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作者：
Inaba, Yohei;Nakamura, Masaaki;Chida, Koichi
医用放射治疗后与辐射相关的组织损伤，如透视引导介入(FGI)，已有患者的报告。在FGI期间对患者进行医疗辐射暴露的实时监测对于避免此类组织损伤非常重要。在我们之前的研究中，我们报道了一种用于FGI的新型(原型)实时辐射系统。然而，尽管原型传感器具有高质量的基本特性，但它对侧面和背面的辐射暴露的敏感度很低。因此，我们开发了一种新型的四通道传感器，对其形状和尺寸进行了改进，并对新的传感器和以前的传感器的基本性能(即测量能量、剂量线性、剂量率和角度相关性)进行了评估。我们的实时剂量计系统的两个传感器都表现出低的能量依赖性、良好的剂量线性(R2=1.0000)和良好的剂量率依赖性(即，在5%的统计学差异内)。此外，新传感器在水平和垂直方向上的0度+/-180度的灵敏度几乎是100%的灵敏度，这显著改善了角度相关性。此外，由于改变了小的形状和尺寸，新型剂量计对X射线图像(透视)的影响比其他传感器小。因此，开发的剂量计系统有望用于测量FGI过程中患者暴露于辐射剂量的情况。
Radiation-related tissue injuries after medical radiation procedures, such as fluoroscopically guided intervention (FGI), have been reported in patients. Real-time monitoring of medical radiation exposure administered to patients during FGI is important to avoid such tissue injuries. In our previous study, we reported a novel (prototype) real-time radiation system for FGI. However, the prototype sensor indicated low sensitivity to radiation exposure from the side and back, although it had high-quality fundamental characteristics. Therefore, we developed a novel 4-channel sensor with modified shape and size than the previous sensor, and evaluated the basic performance (i.e., measured the energy, dose linearity, dose rate, and angular dependence) of the novel and previous sensors. Both sensors of our real-time dosimeter system demonstrated the low energy dependence, excellent dose linearity (R-2 = 1.0000), and good dose rate dependence (i.e., within 5% statistical difference). Besides, the sensitivity of 0 degrees +/- 180 degrees in the horizontal and vertical directions was almost 100% sensitivity for the new sensor, which significantly improved the angular dependence. Moreover, the novel dosimeter exerted less influence on X-ray images (fluoroscopy) than other sensors because of modifying a small shape and size. Therefore, the developed dosimeter system is expected to be useful for measuring the exposure of patients to radiation doses during FGI procedures.