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arXiv 1406.1389physics.ins-det
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低剂量电子显微术中三种直接电子探测器在300 keV的最佳性能比较

Comparison of optimal performance at 300 keV of three direct electron detectors for use in low dose electron microscopy

G. McMullan, A. R. Faruqi, D. Clare, R. Henderson

摘要:

低剂量电子成像应用,如电子冷冻显微镜,现在受益于最近推出的电子成像检测器,其中电子直接入射到背薄CMOS传感器的改进的性能和灵活性。目前有三种商用探测器:Direct Electron DE 20、FEI Falcon II和Gatan K2 Summit。它们具有不同的特性,因此仔细比较它们的成像特性以优化各自的使用方式非常重要。结果在300 keV的调制传递函数(MTF)和检测量子效率(DQE)。其中,DQE在辐射敏感样品的研究中是最重要的,其中检测器性能至关重要。我们发现,所有三个探测器有一个更好的DQE比电影。K2 Summit在低空间频率下具有最佳的DQE,但随着空间频率的增加,其DQE低于Falcon II。

英文摘要:

Low dose electron imaging applications such as electron cyro-microscopy are now benefitting from the improved performance and flexibility of recently introduced electron imaging detectors in which electrons are directly incident on backthinned CMOS sensors. There are currently three commercially available detectors of this type: the Direct Electron DE 20, the FEI Falcon II and the Gatan K2 Summit. These have different characteristics and so it is important to compare their imaging properties carefully with a view to optimising how each is used. Results at 300 keV for both the modulation transfer function (MTF) and detective quantum efficiency (DQE) are presented. Of these, the DQE is the most important in the study of radiation sensitive samples where detector performance is crucial. We find that all three detectors have a better DQE than film. The K2 Summit has the best DQE at low spatial frequencies but with increasing spatial frequency its DQE falls below that of the Falcon II.

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