DivergentBeamGeometry

class odl.tomo.geometry.geometry.DivergentBeamGeometry(ndim, motion_part, detector, translation=None, **kwargs)

Bases: odl.tomo.geometry.geometry.Geometry

Abstract divergent beam geometry class.

A geometry characterized by the presence of a point-like ray source.

In 2D such a geometry is usually called “fan beam geometry”, while in 3D one speaks of “cone beam geometries”.

Attributes

check_bounds

If True, methods computing vectors check input arguments.

det_grid

Sampling grid of det_params.

det_params

Continuous detector parameter range, an IntervalProd.

det_partition

Partition of the detector parameter set into subsets.

detector

Detector representation of this geometry.

grid

Joined sampling grid for motion and detector.

implementation_cache

Dictionary acting as a cache for this geometry.

motion_grid

Sampling grid of motion_params.

motion_params

Continuous motion parameter range, an IntervalProd.

motion_partition

Partition of the motion parameter set into subsets.

ndim

Number of dimensions of the geometry.

params

Joined parameter set for motion and detector.

partition

Joined parameter set partition for motion and detector.

translation

Shift of the origin of this geometry.

Methods

det_point_position(self, mparam, dparam)	Return the detector point at (mparam, dparam).
det_refpoint(self, mparam)	Detector reference point function.
det_to_src(self, angle, dparam[, normalized])	Vector or direction from a detector location to the source.
rotation_matrix(self, mparam)	Return the rotation matrix to the system state at mparam.
src_position(self, angle)	Source position function.

__init__(self, ndim, motion_part, detector, translation=None, \*\*kwargs)

Initialize a new instance.

Parameters

ndimpositive int

Number of dimensions of this geometry, i.e. dimensionality of the physical space in which this geometry is embedded.

motion_partRectPartition

Partition for the set of “motion” parameters.

detectorDetector

The detector of this geometry.

translationarray-like, optional

Global translation of the geometry. This is added last in any method that computes an absolute vector, e.g., det_refpoint. Default: zero vector of length ndim

Other Parameters

check_boundsbool, optional

If True, methods computing vectors check input arguments. Checks are vectorized and add only a small overhead. Default: True