期刊
ULTRAMICROSCOPY
卷 109, 期 12, 页码 1411-1416出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultramic.2009.07.004
关键词
DQE; MTF; CMOS; Electron counting
类别
资金
- Medical Research Council [MC_U105184322, MC_U105184321] Funding Source: Medline
- MRC [MC_U105184322, MC_U105184321] Funding Source: UKRI
- Medical Research Council [MC_U105184322, MC_U105184321] Funding Source: researchfish
We compare the direct electron imaging performance at 120 keV of a monolithic active pixel sensor (MAPS) operated in a conventional integrating mode with the performance obtained when operated in a single event counting mode. For the combination of sensor and incident electron energy used here, we propose a heuristic approach with which to process the single event images in which each event is renormalised to have an integrated weight of unity. Using this approach we find enhancements in the Nyquist frequency modulation transfer function (MTF) and detective quantum efficiency (DQE) over the corresponding integrating mode values by factors of 8 and 3, respectively. (C) 2009 Elsevier B.V. All rights reserved.
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