Journal
ULTRAMICROSCOPY
Volume 85, Issue 1, Pages 9-13Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0304-3991(00)00046-2
Keywords
charge-coupled device camera; modulation transfer function; detection quantum efficiency
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The modulation transfer function, noise transfer function and detection quantum efficiency of both 1k(2) and 2k(2) cameras attached to the same 300 kV FEGTEM have been measured. The results show that both the MTF and the DQE of the 2k(2) camera are lower than for the 1k(2) camera at frequencies above a third of the Nyquist limit. This lower per-pixel performance of the 2k(2) camera is primarily a result of the use of a thicker phosphor scintillator. However, MTF and DQE of the 2k(2) camera operated as an effective 1k(2) camera by using 2x(2) pixel binning are superior to the 1k' camera in the medium spatial frequency range. (C) 2000 Elsevier Science B.V. All rights reserved.
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