Name

ctf_1d - create a list with 1D `CTF` values.

Usage

ctf = ctf_1d(nx, pixel_size, defocus, voltage, cs, amp_contrast, b_factor, sign)

Input

nx

image size to which CTF will be applied.

pixel_size

pixel size in `Å`.

dz

defocus in `Å`.

volt

microscope voltage in kV (default 300 kV).

cs

Spherical aberration constant in mm. (Default 2.0)

wgh

Amplitude contrast ratio, a unitless number in range of (0,1). (Default 0.1)

b_factor

B-factor defining exponential decay of Fourier amplitudes decay with unit 1/`Å^2`. (Default 0.0, i.e., no decay). (See filt_ctf for definition).

sign

sign of the CTF. If cryo data had inverted contrat, i.e., images were multiplied by -1 and particle projections appear bright on dark background, it has to be set to -1). (Default -1).

Output

ctf

a list of `CTF` values.

Description

• 1. See filt_ctf for more information about `CTF`

• 2. See ali2d_w for more information about Wiener Filter

Method

Reference

Author / Maintainer

• Zhong Huang

Keywords

category 1

MORPHOLOGY

Files

utilities.py

See also

ctf_2, ctf_img, ali2d_w, ali2d_w_mf, filt_ctf

Maturity

stable

works for most people, has been tested; test cases/examples available.

Bugs

None. It is perfect.