Index

Protein Data Bank exchange dictionary (pdbx) version 1.0521

_em_3d_reconstruction.ctf_correction_method

Definition:

   The  CTF-correction method. 
     The Contrast Transfer Function CTF compensation for low contrast
     specimens (e.g. frozen-hydrated), for which phase contrast is the only
     significant mechanism, then higher defocus levels must be used to
     achieve any significant transfer, and several images at different
     focus levels must be combined to complete the information lost from
     the transfer gaps of any one image.  The CTF correction can be applied
     to each extracted particle separately or to the whole micrograph after
     digitisation. The simplest level of compensation is to reverse phases
     at the negative lobes of the CTF.

Type: text

Mandatory item: no

Category: em_3d_reconstruction