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WAVIMG - MTF input file > Dr. Probe / Documentation / WAVIMG / Control Files |
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Line 16 of the WAVIMG parameter file you specifies a detector MTF by a file name. The MTF file is a text list of values describing the frequency dependent amplitude modulation of the image contrast in a radially symmetric form. The MTF data is assumed to be given without the attenuation due to pixel binning.
The format of the MTF text file is described in the table below.
|
Line |
Parameters |
Description (WAVIMG version 0.55+) |
|
1 |
<number> |
Number of MTF values NMTF = N/2+1, where N
is the number of CCD pixels along one dimension |
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2 |
<float> |
MTF(k=0) |
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3 |
<float> |
MTF(k=1/N) |
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... |
<float> |
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|
NMTF+1 |
<float> |
MTF(k=1/2) |
The MTF may be different for each detector and can vary significantly with the electron energy. If possible the MTF should be measured with a knife edge or similar method. The measured MTF of a Gatan UltraScan 1000 with 2k x 2k pixels for 300 keV electrons is provided here as an example.
Download MTF of a Gatan UltraScan 1000P TEM CCD detector for 300 keV electrons.
Last update: Jan 25, 2019 contact disclaimer(de)