CylindricalDetector

class odl.applications.tomo.geometry.detector.CylindricalDetector(partition, axes, radius, check_bounds=True)[source]

Bases: Detector

A 2D detector on a cylindrical surface in 3D space.

The cylindrical surface that corresponds to the partition is rotated to be aligned with given axes and shifted to cross the origin. Note that the partition angle increases in the clockwise direction, by analogy to flat detectors.

__init__(partition, axes, radius, check_bounds=True)[source]

Initialize a new instance.

Parameters

partition2-dim. RectPartition: Partition of the parameter interval, corresponding to the angular partition and height partition.
axessequence of array-like: Fixed pair of of unit vectors with which the detector is aligned. The vectors must have shape (3,) and be perpendicular.
radiusnonnegative float: Radius of the cylinder.
check_boundsbool, optional: If True, methods computing vectors check input arguments. Checks are vectorized and add only a small overhead.

Examples

Initialize a detector with height 8 and circle radius 2 extending to 90 degrees on both sides of the origin (a half cylinder).

>>> part = odl.uniform_partition(
...     [-np.pi / 2, -4], [np.pi / 2, 4], [10, 8])
>>> det = CylindricalDetector(
...     part, axes=[(1, 0, 0), (0, 0, 1)], radius=2)
>>> det.axes
array([[ 1.,  0.,  0.],
       [ 0.,  0.,  1.]])
>>> det.radius
2.0
>>> np.allclose(det.surface_normal([0, 0]), [ 0, -1,  0])
True