Wedge

class Wedge(shape, tilt_axis, opening_axis, angles, weights, weight_type=None, frequency_cutoff=0.5)

Bases: object

Generate wedge mask for tomographic data.

Parameters:

shapetuple of int

The shape of the reconstruction volume.

tilt_axisint

Axis the plane is tilted over.

opening_axisint

The axis around which the volume is opened.

anglestuple of float

The tilt angles.

weightstuple of float

The weights corresponding to each tilt angle.

weight_typestr, optional

The type of weighting to apply, defaults to None.

frequency_cutofffloat, optional

Frequency cutoff for created mask. Nyquist 0.5 by default.

Returns:

Dict

A dictionary containing weighted wedges and related information.

Methods

Wedge.from_file(filename)	Generate a Wedge instance by reading tilt angles and weights from a tab-separated text file.
Wedge.weight_angle(shape, weights, angles, ...)	Generate weighted wedges based on the cosine of the current angle.
Wedge.weight_grigorieff(shape, opening_axis, ...)	Generate weighted wedges based on the formalism introduced in [Reeee77939e46-1].
Wedge.weight_relion(shape, opening_axis, ...)	Generate weighted wedges based on the RELION 1.4 formalism, weighting each angle using the cosine of the angle and a Gaussian lowpass filter computed with respect to the exposure per angstrom.