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/*
-----------------------------------------------------------------------
Copyright: 2010-2021, imec Vision Lab, University of Antwerp
2014-2021, CWI, Amsterdam
Contact: astra@astra-toolbox.com
Website: http://www.astra-toolbox.com/
This file is part of the ASTRA Toolbox.
The ASTRA Toolbox is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
The ASTRA Toolbox is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
-----------------------------------------------------------------------
*/
#ifndef _INC_ASTRA_SIRTALGORITHM
#define _INC_ASTRA_SIRTALGORITHM
#include "Globals.h"
#include "Config.h"
#include "Algorithm.h"
#include "ReconstructionAlgorithm2D.h"
#include "Projector2D.h"
#include "Float32ProjectionData2D.h"
#include "Float32VolumeData2D.h"
#include "DataProjector.h"
namespace astra {
/**
* \brief
* This class contains the implementation of the SIRT (Simultaneous Iterative Reconstruction Technique) algorithm.
*
* The update step of pixel \f$v_j\f$ for iteration \f$k\f$ is given by:
* \f[
* v_j^{(k+1)} = v_j^{(k)} + \lambda \sum_{i=1}^{M} \left( \frac{w_{ij}\left( p_i - \sum_{r=1}^{N} w_{ir}v_r^{(k)}\right)}{\sum_{k=1}^{N} w_{ik}} \right) \frac{1}{\sum_{l=1}^{M}w_{lj}}
* \f]
*
* \par XML Configuration
* \astra_xml_item{ProjectorId, integer, Identifier of a projector as it is stored in the ProjectorManager.}
* \astra_xml_item{ProjectionDataId, integer, Identifier of a projection data object as it is stored in the DataManager.}
* \astra_xml_item{ReconstructionDataId, integer, Identifier of a volume data object as it is stored in the DataManager.}
* \astra_xml_item_option{ReconstructionMaskId, integer, not used, Identifier of a volume data object that acts as a reconstruction mask. 1 = reconstruct on this pixel. 0 = don't reconstruct on this pixel.}
* \astra_xml_item_option{SinogramMaskId, integer, not used, Identifier of a projection data object that acts as a projection mask. 1 = reconstruct using this ray. 0 = don't use this ray while reconstructing.}
* \astra_xml_item_option{UseMinConstraint, bool, false, Use minimum value constraint.}
* \astra_xml_item_option{MinConstraintValue, float, 0, Minimum constraint value.}
* \astra_xml_item_option{UseMaxConstraint, bool, false, Use maximum value constraint.}
* \astra_xml_item_option{MaxConstraintValue, float, 255, Maximum constraint value.}
* \astra_xml_item_option{Relaxation, float, 1, The relaxation factor.}
*
* \par XML Example
* \astra_code{
* <Algorithm type="SIRT">\n
* <ProjectorID>proj_id</ProjectorID>\n
* <ProjectionDataId>sino_id</ProjectionDataId>\n
* <ReconstructionDataId>recon_id</ReconstructionDataId>\n
* <Option key="ReconstructionMaskId" value="3"/>\n
* <Option key="SinogramMaskId" value="4"/>\n
* <Option key="UseMinConstraint" value="yes"/>\n
* <Option key="UseMaxConstraint" value="yes"/>\n
* <Option key="MaxConstraintValue" value="1024"/>\n
* <Option key="Relaxation" value="1"/>\n
* </Algorithm>
* }
*
* \par MATLAB example
* \astra_code{
* cfg = astra_struct('SIRT');\n
* cfg.ProjectorId = proj_id;\n
* cfg.ProjectionDataId = sino_id;\n
* cfg.ReconstructionDataId = recon_id;\n
* cfg.option.SinogramMaskId = smask_id;\n
* cfg.option.ReconstructionMaskId = mask_id;\n
* cfg.option.UseMinConstraint = 'yes';\n
* cfg.option.UseMaxConstraint = 'yes';\n
* cfg.option.MaxConstraintValue = 1024;\n
* cfg.option.Relaxation = 1.0;\n
* alg_id = astra_mex_algorithm('create'\, cfg);\n
* astra_mex_algorithm('iterate'\, alg_id\, 10);\n
* astra_mex_algorithm('delete'\, alg_id);\n
* }
*
* \par References
* [1] "Computational Analysis and Improvement of SIRT", J. Gregor, T. Benson, IEEE Transactions on Medical Imaging, Vol. 22, No. 7, July 2008.
*/
class _AstraExport CSirtAlgorithm : public CReconstructionAlgorithm2D {
protected:
/** Init stuff
*/
virtual void _init();
/** Initial clearing. Only to be used by constructors.
*/
virtual void _clear();
/** Check the values of this object. If everything is ok, the object can be set to the initialized state.
* The following statements are then guaranteed to hold:
* - valid projector
* - valid data objects
*/
virtual bool _check();
/** Temporary data object for storing the total ray lengths
*/
CFloat32ProjectionData2D* m_pTotalRayLength;
/** Temporary data object for storing the total pixel weigths
*/
CFloat32VolumeData2D* m_pTotalPixelWeight;
/** Temporary data object for storing the difference between the forward projected
* reconstruction, and the measured projection data
*/
CFloat32ProjectionData2D* m_pDiffSinogram;
/** Temporary data object for storing volume data
*/
CFloat32VolumeData2D* m_pTmpVolume;
/** The number of performed iterations
*/
int m_iIterationCount;
/** Relaxation parameter
*/
float m_fLambda;
public:
// type of the algorithm, needed to register with CAlgorithmFactory
static std::string type;
/** Default constructor, containing no code.
*/
CSirtAlgorithm();
/** Default constructor
*
* @param _pProjector Projector Object.
* @param _pSinogram ProjectionData2D object containing the sinogram data.
* @param _pReconstruction VolumeData2D object for storing the reconstructed volume.
*/
CSirtAlgorithm(CProjector2D* _pProjector,
CFloat32ProjectionData2D* _pSinogram,
CFloat32VolumeData2D* _pReconstruction);
/** Destructor.
*/
virtual ~CSirtAlgorithm();
/** Clear this class.
*/
virtual void clear();
/** Initialize the algorithm with a config object.
*
* @param _cfg Configuration Object
* @return Initialization successful?
*/
virtual bool initialize(const Config& _cfg);
/** Initialize class.
*
* @param _pProjector Projector Object.
* @param _pSinogram ProjectionData2D object containing the sinogram data.
* @param _pReconstruction VolumeData2D object for storing the reconstructed volume.
* @return Initialization successful?
*/
bool initialize(CProjector2D* _pProjector,
CFloat32ProjectionData2D* _pSinogram,
CFloat32VolumeData2D* _pReconstruction);
/** Get all information parameters.
*
* @return Map with all available identifier strings and their values.
*/
virtual std::map<std::string,boost::any> getInformation();
/** Get a single piece of information represented as a boost::any
*
* @param _sIdentifier Identifier string to specify which piece of information you want.
* @return One piece of information.
*/
virtual boost::any getInformation(std::string _sIdentifier);
/** Perform a number of iterations.
*
* @param _iNrIterations amount of iterations to perform.
*/
virtual void run(int _iNrIterations = 0);
/** Get a description of the class.
*
* @return description string
*/
virtual std::string description() const;
};
// inline functions
inline std::string CSirtAlgorithm::description() const { return CSirtAlgorithm::type; };
} // end namespace
#endif
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