Data Item _em_3d_reconstruction.ctf_correction_method

General

Item name
_em_3d_reconstruction.ctf_correction_method
Category name
em_3d_reconstruction
Attribute name
ctf_correction_method
Required in PDB entries
no
Used in current PDB entries
Yes, in about 0.5 % of entries

Item Description

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.

Item Example

     The volumes were CTF-corrected in defocus groups, with an average of approximately 999 individual images per group

Data Type

Data type code
text
Data type detail
text item types / multi-line text ...
Primitive data type code
char
Regular expression
[][ \n\t()_,.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*