Point Resolution

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Point Resolution (or Point-to-Point, or Directly Interpretable Resolution) of a microscope corresponds to the to the point when the CTF first crosses the k-axis at the extended scherzer defocus and can be expressed as:

 

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Phase contrast images are directly interpretable only up to the point resolution (Scherzer resolution limit).

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If the information limit is beyond the point resolution limit, one needs to use image simulation software to interpret any detail beyond point resolution limit.