Medipix3对60和80个keV电子的近理想探测器性能的演示和理解
Medipix3 Demonstration and understanding of near ideal detector performance for 60 & 80 keV electrons
摘要：
在我们的文章中，我们报告的第一个定量测量成像性能的当前一代的混合像素探测器，Medipix 3，作为直接电子探测器。利用60和80 keV的光束能量，调制传递函数（MTF）和探测量子效率（DQE）的测量已经揭示，在单像素模式（SPM）中，可以选择能量阈值以使MTF或DQE最大化，获得接近甚至超过理想探测器的值。我们已经证明，Medipix3电荷求和模式（CSM）可以同时提供MTF和DQE的接近理想值。为了进一步了解直接探测性能，我们表征了探测器对单电子事件的响应，建立了一个经验模型，可以根据能量阈值预测探测器MTF和DQE性能。举例说明我们的研究结果，我们证明了Medipix3成像性能，记录在24位深度和SPM和CSM模式下的图像完全曝光的电子衍射图案。总之，我们的研究结果强调，对于在低能量（能量<100 keV）下进行的透射电子显微镜，厚混合像素探测器为直接电子成像提供了有利的替代架构
英文摘要：
In our article we report first quantitative measurements of imaging performance for the current generation of hybrid pixel detector, Medipix3, as direct electron detector. Utilising beam energies of 60 & 80 keV, measurements of modulation transfer function (MTF) and detective quantum efficiency (DQE) have revealed that, in single pixel mode (SPM), energy threshold values can be chosen to maximize either the MTF or DQE, obtaining values near to, or even exceeding, those for an ideal detector. We have demonstrated that the Medipix3 charge summing mode (CSM) can deliver simultaneous, near ideal values of both MTF and DQE. To understand direct detection performance further we have characterized the detector response to single electron events, building an empirical model which can predict detector MTF and DQE performance based on energy threshold. Exemplifying our findings we demonstrate the Medipix3 imaging performance, recording a fully exposed electron diffraction pattern at 24-bit depth and images in SPM and CSM modes. Taken together our findings highlight that for transmission electron microscopy performed at low energies (energies <100 keV) thick hybrid pixel detectors provide an advantageous and alternative architecture for direct electron imaging
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