A LYSO-GAPD detector module was developed for use in DEXA applications, and it was characterized under a variety of conditions. The LYSO with 3 mm × 3 mm × 2 mm pixel size provided a detection efficiency of > 99.9% at 80 keV . It was coupled to a GAPD with an active area of 3.07 mm × 3.07 mm and 5676 microcells. The energy spectra were acquired using different gamma rays. The X-ray energy spectra were measured as a function of different tube voltages and currents. A pulse pileup effect was observed under extremely high incident photon conditions at a tube current > 0.5 mA. The maximum count rate was 2 Mcps, mainly due to the dead time of the data acquisition unit. Dual energy peaks were clearly isolated, and the peak-to-valley ratio as a function of K-edge filter thickness increased from 2.8 to 14.2 and from 1.7 to 3.8 for the low- and high- energy-band, respectively. The DEXA phantom image for each step was clearly resolved. These results demonstrate the feasibility of usi...

中文翻译：

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LYSO-GAPD检测器在DEXA应用中的可行性研究

LYSO-GAPD检测器模块已开发用于DEXA应用，并已在多种条件下进行了表征。像素尺寸为3 mm×3 mm×2 mm的LYSO在80 keV时提供的检测效率> 99.9％。它与具有3.07 mm×3.07 mm的有效面积和5676个微电池的GAPD耦合。使用不同的伽马射线获得能谱。根据不同的管电压和电流测量X射线能谱。在极高的入射光子条件下，当管电流> 0.5 mA时，观察到脉冲堆积效应。最大计数率为2 Mcps，主要是由于数据采集单元的停滞时间。清楚地隔离了双重能量峰，并且峰谷比作为K边缘滤镜厚度的函数从2.8增加到14.2，从1.7增加到3。低和高能带分别为8。每个步骤的DEXA幻像图像均已清晰解析。这些结果证明了使用...的可行性。