Han Bongju, Park Minji, Kim Kyuseok, Lee Youngjin
Quality Assurance Team, Business Division, Vieworks, 41-3, Burim-ro 170beon-gil, Dongan-gu, Anyang-si 14055, Korea.
Department of Radiological Science, College of Health Science, Gachon University, 191, Hambakmoe-ro, Yeonsu-gu, Incheon 21936, Korea.
Diagnostics (Basel). 2022 Aug 30;12(9):2103. doi: 10.3390/diagnostics12092103.
Low-dose exposure and work convenience are required for mobile X-ray systems during the COVID-19 pandemic. We investigated a novel X-ray detector (FXRD-4343FAW, VIEWORKS, Anyang, Korea) composed of a thin-film transistor based on amorphous silicon with a flexible plastic substrate. This detector is composed of a thallium-doped cesium iodide scintillator with a pixel size of 99 μm, pixel matrix of 4316 × 4316, and weight of 2.95 kg. The proposed detector has the advantages of high-noise characteristics and low weight, which provide patients and workers with an advantage in terms of the dose and work efficiency, respectively. We performed a quantitative evaluation and an experiment to demonstrate its viability. The modulation transfer function, noise power spectrum, and detective quantum efficiency were identified using the proposed and comparative detectors, according to the International Electrotechnical Commission protocol. Additionally, the contrast-to-noise ratio and coefficient of variation were investigated using a human-like phantom. Our results indicate that the proposed detector efficiently increases the image performance in terms of noise characteristics. The detailed performance evaluation demonstrated that the outcomes of the use of the proposed detector confirmed the viability of mobile X-ray devices that require low doses. Consequently, the novel FXRD-4343FAW X-ray detector is expected to improve the image quality and work convenience in extended radiography.
在新冠疫情期间，移动X射线系统需要低剂量照射和工作便利性。我们研究了一种新型X射线探测器（FXRD - 4343FAW，VIEWORKS，韩国安阳），它由基于非晶硅的薄膜晶体管和柔性塑料基板组成。该探测器由像素尺寸为99μm、像素矩阵为4316×4316且重量为2.95kg的铊掺杂碘化铯闪烁体组成。所提出的探测器具有高噪声特性和低重量的优点，分别在剂量和工作效率方面为患者和工作人员提供了优势。我们进行了定量评估和实验以证明其可行性。根据国际电工委员会协议，使用所提出的探测器和对比探测器确定调制传递函数、噪声功率谱和探测量子效率。此外，使用类人模体研究了对比度噪声比和变异系数。我们的结果表明，所提出的探测器在噪声特性方面有效地提高了图像性能。详细的性能评估表明，使用所提出的探测器的结果证实了需要低剂量的移动X射线设备的可行性。因此，新型FXRD - 4343FAW X射线探测器有望在扩展放射成像中提高图像质量和工作便利性。
