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- Contrast_transfer_function abstract "The contrast transfer function is the equivalent of the optical transfer function in light that affects images collected in a transmission electron microscope. The contrast transfer function must be corrected in the images in order to obtain high resolution structures in three-dimensional electron microscopy, especially cryo-electron microscopy.The oscillations of contrast transfer functions have the form (not including the envelope function):where A is the amplitude contrast. The amplitude contrast term can be converted into a phase shift, using the linear combination trigonometry rule:where . The function is defined as:where r is the radius from the center of the image, Cs is the spherical aberration, λ is the wavelength of the electron beam (usually converted from the potential difference voltage) and z is the amount of defocus (using the convention that underfocus is negative and overfocus is positive)Furthermore, if the CTF is astigmatic, the defocus becomes a function of the angle θ where the astigmatic angle, θast given by:where is the average defocus and is the difference between the maximal and minimal defocus in the CTF. Where the defocal difference is defined such that: or".
- Contrast_transfer_function thumbnail Contrast_transfer_function.jpg?width=300.
- Contrast_transfer_function wikiPageExternalLink ref2.html.
- Contrast_transfer_function wikiPageExternalLink ctf.html.
- Contrast_transfer_function wikiPageExternalLink watch?v=I3_4HF1ZeIQ.
- Contrast_transfer_function wikiPageID "24481760".
- Contrast_transfer_function wikiPageRevisionID "586963744".
- Contrast_transfer_function hasPhotoCollection Contrast_transfer_function.
- Contrast_transfer_function subject Category:Microscopes.
- Contrast_transfer_function subject Category:Protein_structure.
- Contrast_transfer_function type Artifact100021939.
- Contrast_transfer_function type Device103183080.
- Contrast_transfer_function type Instrument103574816.
- Contrast_transfer_function type Instrumentality103575240.
- Contrast_transfer_function type Magnifier103709206.
- Contrast_transfer_function type Microscope103760671.
- Contrast_transfer_function type Microscopes.
- Contrast_transfer_function type Object100002684.
- Contrast_transfer_function type PhysicalEntity100001930.
- Contrast_transfer_function type ScientificInstrument104147495.
- Contrast_transfer_function type Whole100003553.
- Contrast_transfer_function comment "The contrast transfer function is the equivalent of the optical transfer function in light that affects images collected in a transmission electron microscope. The contrast transfer function must be corrected in the images in order to obtain high resolution structures in three-dimensional electron microscopy, especially cryo-electron microscopy.The oscillations of contrast transfer functions have the form (not including the envelope function):where A is the amplitude contrast.".
- Contrast_transfer_function label "Contrast transfer function".
- Contrast_transfer_function label "Função de transferência de contraste".
- Contrast_transfer_function sameAs Função_de_transferência_de_contraste.
- Contrast_transfer_function sameAs m.0803hv7.
- Contrast_transfer_function sameAs Q5165765.
- Contrast_transfer_function sameAs Q5165765.
- Contrast_transfer_function sameAs Contrast_transfer_function.
- Contrast_transfer_function wasDerivedFrom Contrast_transfer_function?oldid=586963744.
- Contrast_transfer_function depiction Contrast_transfer_function.jpg.
- Contrast_transfer_function isPrimaryTopicOf Contrast_transfer_function.
