This class implements the Maximum Likelihood Expectation Maximization algorithm. More...

#include <iOptimizerMLEM.hh>

Inheritance diagram for iOptimizerMLEM:

Collaboration diagram for iOptimizerMLEM:

Public Member Functions
	iOptimizerMLEM ()
	The constructor of iOptimizerMLEM. More...

	~iOptimizerMLEM ()
	The destructor of iOptimizerMLEM. More...

int	ReadConfigurationFile (const string &a_configurationFile)
	A function used to read options from a configuration file. More...

int	ReadOptionsList (const string &a_optionsList)
	A function used to read options from a list of options. More...

Public Member Functions inherited from vOptimizer
	vOptimizer ()
	The constructor of vOptimizer. More...

virtual	~vOptimizer ()
	The destructor of vOptimizer. More...

void	ShowHelp ()
	A function used to show help about the optimizer. More...

int	CheckParameters ()
	A public function used to check the parameters settings. More...

int	Initialize ()
	A public function used to initialize the optimizer. More...

int	UpdateVisitedVoxels (oImageSpace *ap_Image)
	A public function used to update the 'visited' voxels after each subset. More...

int	PreDataUpdateStep (int a_iteration, int a_nbIterations, int a_subset, int a_nbSubsets)
	A public function used to do stuff that need to be done at the beginning of a subset (before the data update step; i.e. the loop over all events) More...

int	PostDataUpdateStep (int a_iteration, int a_nbIterations, int a_subset, int a_nbSubsets)
	A public function used to do stuff that need to be done at the beginning of a subset (before the data update step; i.e. the loop over all events) More...

virtual int	DataStep1ForwardProjectModel (oProjectionLine ap_Line, oImageSpace ap_Image, vEvent *ap_Event, int a_bed, int a_timeFrame, int a_respGate, int a_cardGate, int a_thread)
	A public function used to compute the model: forward projection of the provided event. More...

virtual int	DataStep2Optional (oProjectionLine ap_Line, oImageSpace ap_Image, vEvent *ap_Event, int a_bed, int a_timeFrame, int a_respGate, int a_cardGate, int a_iteration, int a_thread)
	A public function which does nothing but being virtual. More...

virtual int	DataStep3BackwardProjectSensitivity (oProjectionLine ap_Line, oImageSpace ap_Image, vEvent *ap_Event, int a_bed, int a_timeFrame, int a_respGate, int a_cardGate, int a_thread)
	A public function used to back-project the sensitivity terms for the provided event. More...

virtual int	DataStep4Optional (oProjectionLine ap_Line, oImageSpace ap_Image, vEvent *ap_Event, int a_bed, int a_timeFrame, int a_respGate, int a_cardGate, int a_iteration, int a_thread)
	A public function which does nothing but being virtual. More...

virtual int	DataStep5ComputeCorrections (oProjectionLine ap_Line, vEvent ap_Event, int a_bed, int a_timeFrame, int a_respGate, int a_cardGate, int a_thread)
	A public function used to compute the correction terms in the data space, for the provided event. More...

virtual int	DataStep6Optional (oProjectionLine ap_Line, oImageSpace ap_Image, vEvent *ap_Event, int a_bed, int a_timeFrame, int a_respGate, int a_cardGate, int a_iteration, int a_thread)
	A public function which does nothing but being virtual. More...

virtual int	DataStep7BackwardProjectCorrections (oProjectionLine ap_Line, oImageSpace ap_Image, vEvent *ap_Event, int a_bed, int a_timeFrame, int a_respGate, int a_cardGate, int a_thread)
	A public function used to back-project the correction terms into the backward correction image. More...

virtual int	DataStep8ComputeFOM (oProjectionLine ap_Line, vEvent ap_Event, int a_timeFrame, int a_respGate, int a_cardGate, int a_thread)
	A public function used to update the computation of figures-of-merit in the data space. More...

virtual int	ImageUpdateStep (oImageSpace *ap_Image, int a_iteration, int a_nbSubsets)
	A public function used to perform the image update step of the optimizer. More...

void	SetVerbose (int a_verbose)
	Set the verbose level. More...

void	SetImageDimensionsAndQuantification (oImageDimensionsAndQuantification *ap_ImageDimensionsAndQuantification)
	Set the pointer to the image dimensions in use. More...

void	SetNbTOFBins (int a_nbTOFBins)
	Set the number of TOF bins in use. More...

void	SetDataMode (int a_dataMode)
	Set the data mode in use. More...

void	SetDataType (int a_dataType)
	Set the data type in use. More...

void	SetAttenuationImage (FLTNB *ap_attenuationImage, int a_thread)
	Set the attenuation image corresponding to the current thread and current event. More...

void	SetFOMFlag (bool a_optimizerFOMFlag)
	Set the FOM flag specifying if figures-of-merit will be computed or not. More...

void	SetImageStatFlag (bool a_optimizerImageStatFlag)
	Set the image stat flag specifying if basic statistics about image udpate will be computed or not. More...

int	GetNbBackwardImages ()
	Get the number of backward images used by the specific optimizer. More...

FLTNB	GetInitialValue ()
	Get the initial image value (for initialization) More...

Private Member Functions
void	ShowHelpSpecific ()
	A function used to show help about the child optimizer. More...

int	CheckSpecificParameters ()
	A private function used to check the parameters settings specific to the child optimizer. More...

int	InitializeSpecific ()
	This function is used to initialize specific stuff to the child optimizer. More...

int	SensitivitySpecificOperations (FLTNB a_data, FLTNB a_forwardModel, FLTNB ap_weight, FLTNB a_multiplicativeCorrections, FLTNB a_additiveCorrections, FLTNB a_quantificationFactor, oProjectionLine ap_Line)
	This function compute the weight associated to the provided event (for sensitivity computation) More...

int	DataSpaceSpecificOperations (FLTNB a_data, FLTNB a_forwardModel, FLTNB ap_backwardValues, FLTNB a_multiplicativeCorrections, FLTNB a_additiveCorrections, FLTNB a_quantificationFactor, oProjectionLine ap_Line)
	This function performs the data space operations specific to the optimizer (computes the values to be backprojected) More...

int	ImageSpaceSpecificOperations (FLTNB a_currentImageValue, FLTNB ap_newImageValue, FLTNB a_sensitivity, FLTNB ap_correctionValues)
	This function perform the image update step specific to the optimizer. More...

Private Attributes
FLTNB	m_dataSpaceDenominatorThreshold

FLTNB	m_minimumImageUpdateFactor

FLTNB	m_maximumImageUpdateFactor

Additional Inherited Members
Protected Member Functions inherited from vOptimizer
FLTNB	ComputeSensitivity (FLTNB ****a4p_sensitivityImage, int a_timeBasisFunction, int a_respBasisFunction, int a_cardBasisFunction, int a_voxel, int a_nbSubsets)
	A function used to compute the sensitivity of a given voxel and a given set of dynamic basis functions. More...

FLTNB	ForwardProject (oProjectionLine ap_Line, FLTNB ap_image=NULL)
	A function used to forward project the provided image (or 1 if NULL), based on the provided oProjectionLine. More...

void	BackwardProject (oProjectionLine ap_Line, FLTNB ap_image, FLTNB a_value)
	A function used to backward project the provided value into the provided image, based on the provided oProjectionLine. More...

Protected Attributes inherited from vOptimizer
int	m_verbose

int	m_nbBackwardImages

int	m_nbTOFBins

FLTNB **	m2p_forwardValues

FLTNB ***	m3p_backwardValues

FLTNB	m_initialValue

bool	m_listmodeCompatibility

bool	m_histogramCompatibility

oImageDimensionsAndQuantification *	mp_ImageDimensionsAndQuantification

int	m_dataMode

int	m_dataType

FLTNB **	m2p_attenuationImage

bool	m_optimizerFOMFlag

FLTNB ****	m4p_FOMLogLikelihood

FLTNB ****	m4p_FOMRMSE

uint64_t ****	m4p_FOMNbBins

double ****	m4p_FOMNbData

bool	m_optimizerImageStatFlag

INTNB *	mp_imageStatNbVox

FLTNB *	mp_imageStatMin

FLTNB *	mp_imageStatMax

double *	mp_imageStatMean

double *	mp_imageStatVariance

double *	mp_correctionStatMean

double *	mp_correctionStatVariance

Detailed Description

This class implements the Maximum Likelihood Expectation Maximization algorithm.

This class inherits from vOptimizer and implements the classical MLEM algorithm for likelihood maximization. It is implemented in its multiplicative form.

Definition at line 22 of file iOptimizerMLEM.hh.

Constructor & Destructor Documentation

iOptimizerMLEM::iOptimizerMLEM ( )

The constructor of iOptimizerMLEM.

This is the default and unique constructor. It does not take any parameter and its role is only to affect default values to each member of the class.

Definition at line 26 of file iOptimizerMLEM.cc.

iOptimizerMLEM::~iOptimizerMLEM ( )

The destructor of iOptimizerMLEM.

This is the default and unique destructor. It does not take any parameter and its role is only to free or delete all structures that were built by this class.

Definition at line 56 of file iOptimizerMLEM.cc.

Member Function Documentation

int iOptimizerMLEM::CheckSpecificParameters ( )

privatevirtual

A private function used to check the parameters settings specific to the child optimizer.

This function is used to check that all parameters specific to the optimizer are correctly set within allowed values. It is called by the CheckParameters() function of the mother class. It is the implementation of the pure virtual function inherited from the abstract mother class vOptimizer.

Returns: An integer reflecting the check status; 0 if no problem, another value otherwise.

Implements vOptimizer.

Definition at line 149 of file iOptimizerMLEM.cc.

int iOptimizerMLEM::DataSpaceSpecificOperations	(	FLTNB	a_data,
		FLTNB	a_forwardModel,
		FLTNB *	ap_backwardValues,
		FLTNB	a_multiplicativeCorrections,
		FLTNB	a_additiveCorrections,
		FLTNB	a_quantificationFactor,
		oProjectionLine *	ap_Line
	)

privatevirtual

This function performs the data space operations specific to the optimizer (computes the values to be backprojected)

Parameters

FLTNB	a_data
FLTNB	a_forwardModel
FLTNB*	ap_backwardValues
FLTNB	a_multiplicativeCorrections
FLTNB	a_additiveCorrections
FLTNB	a_quantificationFactor
oProjectionLine*	ap_Line

It is the implementation of the pure virtual function from vOptimizer. The results to be backprojected is put at ap_backwardValues location.

Returns: An integer reflecting the process status; 0 if no problem, another value otherwise.

Implements vOptimizer.

Definition at line 217 of file iOptimizerMLEM.cc.

int iOptimizerMLEM::ImageSpaceSpecificOperations	(	FLTNB	a_currentImageValue,
		FLTNB *	ap_newImageValue,
		FLTNB	a_sensitivity,
		FLTNB *	ap_correctionValues
	)

privatevirtual

This function perform the image update step specific to the optimizer.

Parameters

FLTNB	a_currentImageValue
FLTNB*	ap_newImageValue
FLTNB	a_sensitivity
FLTNB*	ap_correctionValues

It is the implementation of the pure virtual function from vOptimizer. The new image value is put at the ap_newImageValue location.

Returns: An integer reflecting the process status; 0 if no problem, another value otherwise.

Implements vOptimizer.

Definition at line 235 of file iOptimizerMLEM.cc.

int iOptimizerMLEM::InitializeSpecific ( )

privatevirtual

This function is used to initialize specific stuff to the child optimizer.

It is called by the public Initialize() function from the mother.

Returns: An integer reflecting the initialization status; 0 if no problem, another value otherwise.

Implements vOptimizer.

Definition at line 178 of file iOptimizerMLEM.cc.

int iOptimizerMLEM::ReadConfigurationFile ( const string & a_configurationFile )

virtual

A function used to read options from a configuration file.

Parameters

const string& a_configurationFile

This function implements the reading of all options associated to the child optimizer, from a configuration file. It is the implementation of the pure virtual function inherited from the abstract class vOptimizer. It checks the reading status but not the options values that will be checked by the CheckSpecificParameters() function.

Returns: An integer reflecting the reading success; 0 if success, another value otherwise.

Implements vOptimizer.

Definition at line 83 of file iOptimizerMLEM.cc.

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int iOptimizerMLEM::ReadOptionsList ( const string & a_optionsList )

virtual

A function used to read options from a list of options.

Parameters

const string& a_configurationFile

This function implements the reading of all options associated to the child optimizer, from a list of options. It is the implementation of the pure virtual function inherited from the abstract class vOptimizer. It checks the reading status but not the options values that will be checked by the CheckSpecificParameters() function.

Returns: An integer reflecting the reading success; 0 if success, another value otherwise.

Implements vOptimizer.

Definition at line 123 of file iOptimizerMLEM.cc.

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int iOptimizerMLEM::SensitivitySpecificOperations	(	FLTNB	a_data,
		FLTNB	a_forwardModel,
		FLTNB *	ap_weight,
		FLTNB	a_multiplicativeCorrections,
		FLTNB	a_additiveCorrections,
		FLTNB	a_quantificationFactor,
		oProjectionLine *	ap_Line
	)

privatevirtual

This function compute the weight associated to the provided event (for sensitivity computation)

Parameters

FLTNB	a_data
FLTNB	a_forwardModel
FLTNB*	ap_weight
FLTNB	a_multiplicativeCorrections
FLTNB	a_additiveCorrections
FLTNB	a_quantificationFactor
oProjectionLine*	ap_Line

It is the implementation of the pure virtual function from vOptimizer. The result is put at ap_weight location.

Returns: An integer reflecting the process status; 0 if no problem, another value otherwise.

Implements vOptimizer.

Definition at line 202 of file iOptimizerMLEM.cc.

void iOptimizerMLEM::ShowHelpSpecific ( )

privatevirtual

A function used to show help about the child optimizer.

This function must describe what the module does and how to use it. It describes in details the different parameters of the optimizer, and how to set them through the use of a configuration file or a list of options. It is the implementation of the pure virtual function inherited from the abstract class vOptimizer. It is called by the public ShowHelp() function.

Implements vOptimizer.

Definition at line 65 of file iOptimizerMLEM.cc.

Member Data Documentation

FLTNB iOptimizerMLEM::m_dataSpaceDenominatorThreshold

private

Threshold applied to the denominator of the data space operation to avoid 0-divisions or too high ratios

Definition at line 154 of file iOptimizerMLEM.hh.

FLTNB iOptimizerMLEM::m_maximumImageUpdateFactor

private

Maximum allowed image update factor (null or negative values mean no restriction)

Definition at line 156 of file iOptimizerMLEM.hh.

FLTNB iOptimizerMLEM::m_minimumImageUpdateFactor

private

Minimum allowed image update factor, useful to avoid voxels trapped in 0 value (null or negative values mean no restriction)

Definition at line 155 of file iOptimizerMLEM.hh.

The documentation for this class was generated from the following files:

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation