ParallelBeamGeometry¶

class odl.tomo.geometry.parallel.ParallelBeamGeometry(ndim, apart, detector, det_pos_init, **kwargs)[source]¶

Bases: Geometry

Abstract parallel beam geometry in 2 or 3 dimensions.

Parallel geometries are characterized by a virtual source at infinity, such that a unit vector from a detector point towards the source (det_to_src) is independent of the location on the detector.

For details, check the online docs.

Attributes:

angles: All angles of this geometry as an array.
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.
det_pos_init: Initial position of the detector reference point.
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`(mparam, dparam)	Return the detector point at `(mparam, dparam)`.
`det_refpoint`(angle)	Return the position(s) of the detector ref.
`det_to_src`(angle, dparam)	Direction from a detector location to the source.
`rotation_matrix`(mparam)	Return the rotation matrix to the system state at `mparam`.

__init__(ndim, apart, detector, det_pos_init, **kwargs)[source]¶

Initialize a new instance.

Parameters:

ndim{2, 3}: Number of dimensions of this geometry, i.e. dimensionality of the physical space in which this geometry is embedded.
apartRectPartition: Partition of the angle set.
detectorDetector: The detector to use in this geometry.
det_pos_initarray-like: Initial position of the detector reference point.
kwargs: Further parameters passed on to Geometry.