CTF

class CTF(shape=None, defocus_x=None, angles=None, opening_axis=2, tilt_axis=0, correct_defocus_gradient=False, sampling_rate=1, acceleration_voltage=300000.0, spherical_aberration=27000000.0, amplitude_contrast=0.07, phase_shift=0, defocus_angle=0, defocus_y=None, flip_phase=True, return_real_fourier=False)

Bases: ComposableFilter

Generate a per-tilt contrast transfer function mask.

Attributes

CTF.acceleration_voltage	The acceleration voltage in Volts, defaults to 300e3.
CTF.amplitude_contrast	The amplitude contrast, defaults to 0.07.
CTF.angles	The tilt angles.
CTF.correct_defocus_gradient	Whether to correct defocus gradient, defaults False.
CTF.defocus_angle	The defocus angle in degrees, defaults to 0.
CTF.defocus_x	The defocus value in x direction (in units of sampling rate).
CTF.defocus_y	The defocus value in y direction, defaults to None (in units of sampling rate).
CTF.flip_phase	Whether the returned CTF should be phase-flipped, defaults to True.
CTF.opening_axis	The microscope projection axis, defaults to 2 (z).
CTF.phase_shift	The phase shift in degrees, defaults to 0.
CTF.return_real_fourier	Whether to return a ctf mask for rfft (for CTFReconstructed).
CTF.sampling_rate	The sampling rate, defaults to 1 Ångstrom / voxel.
CTF.shape	The shape of the to-be created mask.
CTF.spherical_aberration	The spherical aberration, defaults to 2.7e7 (in units of sampling rate).
CTF.tilt_axis	The axis along which the tilt is applied, defaults to 0 (x).

Methods

CTF.__call__(**kwargs)	Returns a CTF stack of chosen parameters with DC component in the center.
CTF.from_file(filename, **kwargs)	Initialize CTF from file.
CTF.weight(shape, defocus_x, angles[, ...])	Compute the CTF weight tilt stack.