tomosipo.geometry.ParallelGeometry

class tomosipo.geometry.ParallelGeometry(angles=1, shape=1, size=None)

A parametrized parallel-beam geometry

__init__(angles=1, shape=1, size=None)

Create a circular parallel-beam geometry

Parameters:

• angles –

  If integral value: the number of angles in the parallel-beam geometry. This describes a half arc (pi radians) with uniform placement and without the start and end point overlapping.

  If np.array: the values of the array are taken as projection angle (units are radians).

• shape – The detector shape in pixels. If tuple, the order is (height, width). Else the pixel has the same number of pixels in the u and v direction.

• size –

  The detector size. If a single float is provided, the detector is square with equal width and height.

  The order is (height, width), i.e. (v, u).

Methods

__init__([angles, shape, size])	Create a circular parallel-beam geometry
from_astra()
project_point(point)	Projects point onto detectors
rescale_det(scale)	Rescale detector pixels
reshape(new_shape)	Reshape detector pixels without changing detector size
to_astra()	Convert geometry to astra geometry
to_vec()	Return a vector geometry of the current geometry
to_vol()	Returns a volume vector geometry representing the detector

Attributes

angles	The angles from which projections are acquired.
corners	Returns a vector with the corners of each detector
det_normal	The detector normal vectors of the geometry.
det_pos	The detector positions of the geometry.
det_shape	The shape of the detector.
det_size	The size of the detector.
det_sizes	The size of each detector.
det_u	The detector u-vectors of the geometry.
det_v	The detector v-vectors of the geometry.
is_cone	Is this geometry a cone-beam geometry?
is_parallel	Is this geometry a parallel-beam geometry?
is_vec	Is this a vector geometry?
lower_left_corner	Returns a vector with the positions of the lower-left corner the detector
num_angles	The number of angles in the projection geometry
num_steps	The number of orientations in the geometry
ray_dir	The ray direction of the geometry.
src_pos	The source positions of the geometry.