Data Item _em_3d_reconstruction.ctf_correction_method
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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|^-]*