Evaluation of a Large Area, 83 μm Pixel Pitch Amorphous Selenium Indirect Flat Panel Detector.
Evaluation of a Large Area, 83 μm Pixel Pitch Amorphous Selenium Indirect Flat Panel Detector.
复制标题
大面积、83 μm 像素间距非晶硒间接平板探测器的评估。
DOI：
10.1109/ted.2023.3338131
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发表时间：
2024
影响因子：
3.1
通讯作者：
Abbaszadeh,Shiva
中科院分区：
文献类型：
--
作者：
Hellier,Kaitlin;Mollov,Ivan;Swaby,Akyl;Pryor,Paul;Abbaszadeh,Shiva
双层探测器提供了一种低成本解决方案，可改善 X 射线成像中的材料分解和病变区分，同时消除多次曝光产生的运动伪影。大多数设计利用两个带有闪烁体的间接探测器，专为低能量和高能量探测而设计，并由铜滤光片隔开，以硬化光束以进行高能量探测。为了提高底部探测器的性能并降低剂量要求，我们之前提出了一种合金化非晶硒光电探测器，以提高绿光波长的分辨率和吸收率，更适合高性能闪烁体，例如 CsI:Tl。在这项工作中，我们展示了底层的基线原型——一个连续的大面积像素间距平板间接探测器，采用成熟的非晶硒作为光电探测器——并验证了该架构的性能和探测器设计。我们表征了探测器的滞后、噪声功率谱、探测量子效率和模块化传递函数，并显示在 150 V 偏压下工作时分辨率高达 6 lp/mm。这为评估合金硒材料提供了一个起点，并显示了该探测器在未来双层设计中的前景。
Dual-layer detectors provide a low-cost solution to improved material decomposition and lesion differentiation in X-ray imaging, while eliminating motion artifacts from multiple exposures. Most designs utilize two indirect detectors with scintillators designed for low-energy and higher-energy detection and separated by a copper filter to harden the beam for high energy detection. To improve the performance of the bottom detector and lower dose requirements, we have previously proposed an alloyed amorphous selenium photodetector to achieve improved resolution and absorption at green wavelengths, better suited to high-performance scintillators such as CsI:Tl. In this work, we demonstrate a baseline prototype for the bottom layer—a continuous, large areapixel pitch flat panel indirect detector with well-established amorphous selenium as the photodetector—and verify the architecture’s performance and detector design. We characterize lag, noise-power spectrum, detective quantum efficiency, and modular transfer function of the detector, and show resolution up to 6 lp/mm when operated at an applied bias of 150 V. This provides a starting point for evaluating the alloyed selenium materials, and shows promise for this detector in the future dual-layer design.