SIRT3D_CUDA
This is a GPU implementation of the SIRT algorithm for 3D data sets. It takes projection data and an initial reconstruction as input, and returns the reconstruction after a specified number of SIRT iterations.
Supported geometries: all 3D geometries.
Configuration options
name |
type |
description |
|---|---|---|
cfg.ProjectionDataId |
required |
The astra_mex_data3d ID of the projection data |
cfg.ReconstructionDataId |
required |
The astra_mex_data3d ID of the reconstruction data. The content of this when starting SIRT3D_CUDA is used as the initial reconstruction. |
cfg.option.SinogramMaskId |
optional |
If specified, the astra_mex_data3d ID of a projection-data-sized volume to be used as a mask. It should only have values 0.0 and 1.0. See the section on [Masks] for details. |
cfg.option.ReconstructionMaskId |
optional |
If specified, the astra_mex_data3d ID of a volume-data-sized volume to be used as a mask. It should only have values 0.0 and 1.0. See the section on [Masks] for details. |
cfg.option.MinConstraint |
optional |
If specified, all values below MinConstraint will be set to MinConstraint. This can be used to enforce non-negative reconstructions, for example. |
cfg.option.MaxConstraint |
optional |
If specified, all values above MaxConstraint will be set to MaxConstraint. |
cfg.option.GPUindex |
optional |
The index (zero-based) of the GPU to use. (default: 0) |
cfg.option.DetectorSuperSampling |
optional |
For the forward projection, DetectorSuperSampling^2 rays will be used. This should only be used if your detector pixels are larger than the voxels in the reconstruction volume. (default: 1) |
cfg.option.VoxelSuperSampling |
optional |
For the backward projection, VoxelSuperSampling^3 rays will be used. This should only be used if your voxels in the reconstruction volume are larger than the detector pixels. (default: 1) |
Extra features
SIRT3D_CUDA supports astra.algorithm.get_res_norm() / astra_mex_algorithm(‘get_res_norm’) to get the 2-norm of the difference between the projection data and the projection of the reconstruction. (The square root of the sum of squares of differences.)