This class is designed to generically described any iterative optimizer. More...

#include <vOptimizer.hh>

Inheritance diagram for vOptimizer:

Collaboration diagram for vOptimizer:

Public Member Functions
	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...

virtual int	ReadConfigurationFile (const string &a_configurationFile)=0
	A function used to read options from a configuration file. More...

virtual int	ReadOptionsList (const string &a_optionsList)=0
	A function used to read options from a list of options. 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...

Protected Member Functions
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
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

Private Member Functions
virtual int	PreDataUpdateSpecificStep (int a_iteration, int a_nbIterations, int a_subset, int a_nbSubsets)
	A private function used to perform any step required by the child optimizer, before the loop on event inside the subset loop. More...

virtual int	PostDataUpdateSpecificStep (int a_iteration, int a_nbIterations, int a_subset, int a_nbSubsets)
	A private function used to perform any step required by the child optimizer, after the loop on event inside the subset loop. More...

virtual void	ShowHelpSpecific ()=0
	A function used to show help about the child module. More...

virtual int	CheckSpecificParameters ()=0
	A private function used to check the parameters settings specific to the child optimizer. More...

virtual int	InitializeSpecific ()=0
	A private function used to initialize everything specific to the child optimizer. More...

virtual int	SensitivitySpecificOperations (FLTNB a_data, FLTNB a_forwardModel, FLTNB ap_weight, FLTNB a_multiplicativeCorrections, FLTNB a_additiveCorrections, FLTNB a_quantificationFactor, oProjectionLine ap_Line)=0
	A private function used to compute the sensitivity weight associated to the provided data. More...

virtual int	DataSpaceSpecificOperations (FLTNB a_data, FLTNB a_forwardModel, FLTNB ap_backwardValues, FLTNB a_multiplicativeCorrections, FLTNB a_additiveCorrections, FLTNB a_quantificationFactor, oProjectionLine ap_Line)=0
	A private function used to compute the correction term in the data space from the provided data. More...

virtual int	ImageSpaceSpecificOperations (FLTNB a_currentImageValue, FLTNB ap_newImageValue, FLTNB a_sensitivity, FLTNB ap_correctionValues)=0
	A private function used to update the image value from the provided data. More...

Detailed Description

This class is designed to generically described any iterative optimizer.

This class is an abstract one, in the sense that it cannot be used on its own because several pure virtual functions belong to it. Its children are implementations of actual optimizers. Everywhere in the code, this parent class should be used instead of any of its children. The optimizer is created by the oOptimizerManager is used during the iterative process of the algorithm through the call of multiple functions. All functions prefixed by DataStepX are called within the DataUpdateStep() function of the oOptimizerManager. The other main function is the ImageUpdateStep() function called by the eponym function from the manager. Anyway, all these aforementioned functions are virtual, but are designed to be flexible enaugh for any kind of optimizer. Finally, a particular optimizer (a child of this vOptimizer) will be characterized by the implementation of some pure virtual functions, some for options and initialization management, and three particular ones that really describe what this particular optimizer does: SensitivitySpecificOperations(), DataSpaceSpecificOperations() and ImageSpaceSpecificOperations(). Read the description of these functions below to get more details.

Definition at line 36 of file vOptimizer.hh.

Constructor & Destructor Documentation

vOptimizer::vOptimizer ( )

The constructor of vOptimizer.

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 25 of file vOptimizer.cc.

vOptimizer::~vOptimizer ( )

virtual

The destructor of vOptimizer.

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. It is virtual, so that it is automatically called when a child object is deleted.

Definition at line 61 of file vOptimizer.cc.

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Member Function Documentation

void vOptimizer::BackwardProject	(	oProjectionLine *	ap_Line,
		FLTNB *	ap_image,
		FLTNB	a_value
	)

protected

A function used to backward project the provided value into the provided image, based on the provided oProjectionLine.

Parameters

oProjectionLine*	ap_Line
FLTNB*	ap_image
FLTNB	a_value

Based on the data type, the function calls the projection function of the oProjectionLine class to backward project the value into the image taking the multiplicative terms into account, and eventually dealing with the SPECT attenuation.

Definition at line 928 of file vOptimizer.cc.

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int vOptimizer::CheckParameters ( )

A public function used to check the parameters settings.

This function does not take any parameter and is used to check that all mandatory members were correctly parameterized. At the end, it calls the pure virtual CheckSpecificParameters() function implemented by children.

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

Definition at line 206 of file vOptimizer.cc.

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private virtual int vOptimizer::CheckSpecificParameters ( )

privatepure virtual

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. It is pure virtual so is implemented by children.

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

Implemented in iOptimizerNEGML, iOptimizerOriginalAML, iOptimizerLandweber, iOptimizerTemplate, and iOptimizerMLEM.

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FLTNB vOptimizer::ComputeSensitivity	(	FLTNB ****	a4p_sensitivityImage,
		int	a_timeBasisFunction,
		int	a_respBasisFunction,
		int	a_cardBasisFunction,
		int	a_voxel,
		int	a_nbSubsets
	)

protected

A function used to compute the sensitivity of a given voxel and a given set of dynamic basis functions.

Parameters

FLTNB****	a4p_sensitivityImage
int	a_timeBasisFunction
int	a_respBasisFunction
int	a_cardBasisFunction
int	a_voxel
int	a_nbSubsets

This function computes the sensitivity for a given set of dynamic basis functions and for a given number of subsets. It loops over the dynamic frames and gates to compute the sensitivity based on basis functions coefficients. In list-mode, as the sensitivity is computed for the whole FOV, the value is divided by the current number of subsets of the current iteration, given as a parameter.

Returns: The computed sensitivity

Definition at line 943 of file vOptimizer.cc.

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

privatepure virtual

A private function used to compute the correction term in the data space from the provided data.

Parameters

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

This function is pure virtual, so must be implemented by specific optimizers. The computed correction term must be put at the ap_backwardValues pointer. All potentially useful information is provided as parameters. This is the operation that the optimization algorithm performs in the data space, in the loop on events. Note that the multiplicate corrections parameter only includes such correction specific to the event; in other words, it does not include the quantification factor which is given separately.

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

Implemented in iOptimizerNEGML, iOptimizerOriginalAML, iOptimizerLandweber, iOptimizerTemplate, and iOptimizerMLEM.

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int vOptimizer::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
	)

virtual

A public function used to compute the model: forward projection of the provided event.

Parameters

oProjectionLine*	ap_Line
oImageSpace*	ap_Image
vEvent*	ap_Event
int	a_bed
int	a_timeFrame
int	a_respGate
int	a_cardGate
int	a_thread

Inside the DataUpdateStep() of the oOptimizerManager, this is the first function called. This function performs the forward projection of the provided event, following the provided projection line. It takes all dynamic dimensions into account, including the intrinsic basis functions. Note that this function uses the ForwardProject() function that automatically deals with attenuation for SPECT and includes all multiplicative terms theoretically included in the system matrix. Then, all additive corrections are added to the forward projection. So the unit of the resulting model is the same as the data. The result of this forward projection is put in the m2p_forwardValues table (for the given thread). The other dimension of this table is for the TOF bins.

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

Definition at line 472 of file vOptimizer.cc.

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int vOptimizer::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
	)

virtual

A public function which does nothing but being virtual.

Parameters

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

Inside the DataUpdateStep() of the oOptimizerManager, this is the second function called. This function can be overloaded by specific optimizers if needed.

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

Definition at line 535 of file vOptimizer.cc.

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int vOptimizer::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
	)

virtual

A public function used to back-project the sensitivity terms for the provided event.

Parameters

oProjectionLine*	ap_Line
oImageSpace*	ap_Image
vEvent*	ap_Event
int	a_bed
int	a_timeFrame
int	a_respGate
int	a_cardGate
int	a_thread

Inside the DataUpdateStep() of the oOptimizerManager, this is the third function called. This function is only called when using histogram data. Before performing the back-projection into the sensitivity image, it calls the pure virtual SensitivitySpecificOperations() function whose role is simply to provide the weight associated to the projection line. Note that this function uses the BackwardProject() function that automatically deals with attenuation for SPECT and includes all multiplicative terms theoretically included in the system matrix.

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

Definition at line 548 of file vOptimizer.cc.

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int vOptimizer::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
	)

virtual

A public function which does nothing but being virtual.

Parameters

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

Inside the DataUpdateStep() of the oOptimizerManager, this is the fourth function called. This function can be overloaded by specific optimizers if needed.

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

Definition at line 587 of file vOptimizer.cc.

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int vOptimizer::DataStep5ComputeCorrections	(	oProjectionLine *	ap_Line,
		vEvent *	ap_Event,
		int	a_bed,
		int	a_timeFrame,
		int	a_respGate,
		int	a_cardGate,
		int	a_thread
	)

virtual

A public function used to compute the correction terms in the data space, for the provided event.

Parameters

oProjectionLine*	ap_Line
vEvent*	ap_Event
int	a_bed
int	a_timeFrame
int	a_respGate
int	a_cardGate
int	a_thread

Inside the DataUpdateStep() of the oOptimizerManager, this is the fifth function called. Its role is to compute the correction terms in the data space, based on the forward model and the data. In order to be specific to each optimizer, it calls the pure virtual function DataSpaceSpecificOperations(), where the computation is done. The correction terms are put in the m3p_backwardValues (a dimension for threads, one for the number of backward images and the last for TOF bins).

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

Definition at line 600 of file vOptimizer.cc.

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int vOptimizer::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
	)

virtual

A public function which does nothing but being virtual.

Parameters

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

Inside the DataUpdateStep() of the oOptimizerManager, this is the sixth function called. This function can be overloaded by specific optimizers if needed.

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

Definition at line 635 of file vOptimizer.cc.

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int vOptimizer::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
	)

virtual

A public function used to back-project the correction terms into the backward correction image.

Parameters

oProjectionLine*	ap_Line
oImageSpace*	ap_Image
vEvent*	ap_Event
int	a_bed
int	a_timeFrame
int	a_respGate
int	a_cardGate
int	a_thread

Inside the DataUpdateStep() of the oOptimizerManager, this is the seventh function called. This function performs the backward projection of the correction terms held into the m3p_backwardValues, for the provided event and following the provided projection line. It takes all dynamic dimensions into account, including the intrinsic basis functions. Note that this function uses the BackwardProject() function that automatically deals with attenuation for SPECT and automatically includes all multiplicative terms theoretically included in the system matrix.

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

Definition at line 648 of file vOptimizer.cc.

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int vOptimizer::DataStep8ComputeFOM	(	oProjectionLine *	ap_Line,
		vEvent *	ap_Event,
		int	a_timeFrame,
		int	a_respGate,
		int	a_cardGate,
		int	a_thread
	)

virtual

A public function used to update the computation of figures-of-merit in the data space.

Parameters

oProjectionLine*	ap_Line
vEvent*	ap_Event
int	a_timeFrame
int	a_respGate
int	a_cardGate
int	a_thread

Inside the DataUpdateStep() of the oOptimizerManager, this is the eighth function called. This function updates the computation of figures-of-merit in the data space for the provided event. It uses the m4p_FOMXXX structures. The computation is done only if the FOM flag is set. For the moment, log-likelihood and RMSE are computed.

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

Definition at line 703 of file vOptimizer.cc.

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FLTNB vOptimizer::ForwardProject	(	oProjectionLine *	ap_Line,
		FLTNB *	ap_image = `NULL`
	)

protected

A function used to forward project the provided image (or 1 if NULL), based on the provided oProjectionLine.

Parameters

oProjectionLine*	ap_Line
FLTNB*	ap_image = NULL

Based on the data type, the function calls the projection function of the oProjectionLine class to forward project the image taking the multiplicative terms into account, and eventually dealing with the SPECT attenuation.

Returns: The computed forward projection

Definition at line 913 of file vOptimizer.cc.

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public inline FLTNB vOptimizer::GetInitialValue ( )

inline

Get the initial image value (for initialization)

Returns: m_initialValue

Definition at line 526 of file vOptimizer.hh.

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public inline int vOptimizer::GetNbBackwardImages ( )

inline

Get the number of backward images used by the specific optimizer.

Returns: m_nbBackwardImages

Definition at line 519 of file vOptimizer.hh.

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private virtual int vOptimizer::ImageSpaceSpecificOperations	(	FLTNB	a_currentImageValue,
		FLTNB *	ap_newImageValue,
		FLTNB	a_sensitivity,
		FLTNB *	ap_correctionValues
	)

privatepure virtual

A private function used to update the image value from the provided data.

Parameters

FLTNB	a_currentImageValue
FLTNB*	ap_newImageValue
FLTNB	a_sensitivity
FLTNB*	ap_correctionValues

This function is pure virtual, so must be implemented by specific optimizers. The old values are provided, as well as the location of the new that will be calculated. This is the operation that the optimization algorithm performs in the image update step, after the loop on events. Note that based on the number of backward images used by the specific optimizer, there can be multiple correction values in ap_correctionValues, explaining why it is provided as a pointer. Note also that this function is only called for non-zero sensitivity, so no need to check it. The design of this function will evolve in order to take into account optimizers with penalties and alternated optimizers like MLAA which estimate the attenuation at the same time.

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

Implemented in iOptimizerNEGML, iOptimizerOriginalAML, iOptimizerLandweber, iOptimizerTemplate, and iOptimizerMLEM.

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int vOptimizer::ImageUpdateStep	(	oImageSpace *	ap_Image,
		int	a_iteration,
		int	a_nbSubsets
	)

virtual

A public function used to perform the image update step of the optimizer.

Parameters

oImageSpace*	ap_Image
int	a_iteration
int	a_nbSubsets

This function is called by the eponym function from the oOptimizerManager. It will manage the dynamic loops, compute the sensitivity using the private ComputeSensitivity() function, and update each voxel according to the specific optimizer by calling the pure virtual ImageSpaceSpecificOperations() function.

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

Definition at line 751 of file vOptimizer.cc.

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int vOptimizer::Initialize ( )

A public function used to initialize the optimizer.

This function does not take any parameter and is used to initialize everything that should be initialized. At the end, it calls the pure virtual InitializeSpecific() function implemented by children.

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

Definition at line 277 of file vOptimizer.cc.

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private virtual int vOptimizer::InitializeSpecific ( )

privatepure virtual

A private function used to initialize everything specific to the child optimizer.

This function is used to initialize everything specific to the optimizer that should be initialized. It is called by the Initialize() function. It is pure virtual so is implemented by children.

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

Implemented in iOptimizerNEGML, iOptimizerOriginalAML, iOptimizerLandweber, iOptimizerTemplate, and iOptimizerMLEM.

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int vOptimizer::PostDataUpdateSpecificStep	(	int	a_iteration,
		int	a_nbIterations,
		int	a_subset,
		int	a_nbSubsets
	)

privatevirtual

A private function used to perform any step required by the child optimizer, after the loop on event inside the subset loop.

Parameters

int	a_iteration
int	a_nbIterations
int	a_subset
int	a_nbSubsets

The vOptimizer implementation just does nothing. It is called by the PostDataUpdateStep() function. It is virtual so it can be overloaded by the child optimizer if needed.

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

Definition at line 461 of file vOptimizer.cc.

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int vOptimizer::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)

Parameters

int	a_iteration
int	a_nbIterations
int	a_subset
int	a_nbSubsets

It does some reseting for the FOM computation. At the end, it calls the PostDataUpdateSpecificStep() function, which does nothing but being virtual, so it can be overloaded to perform specific stuff at this step by specific optimizers that would need to do so.

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

Definition at line 397 of file vOptimizer.cc.

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int vOptimizer::PreDataUpdateSpecificStep	(	int	a_iteration,
		int	a_nbIterations,
		int	a_subset,
		int	a_nbSubsets
	)

privatevirtual

A private function used to perform any step required by the child optimizer, before the loop on event inside the subset loop.

Parameters

int	a_iteration
int	a_nbIterations
int	a_subset
int	a_nbSubsets

The vOptimizer implementation just does nothing. It is called by the PreDataUpdateStep() function. It is virtual so it can be overloaded by the child optimizer if needed.

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

Definition at line 386 of file vOptimizer.cc.

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int vOptimizer::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)

Parameters

int	a_iteration
int	a_nbIterations
int	a_subset
int	a_nbSubsets

It does some reseting for the FOM computation. At the end, it calls the PreDataUpdateSpecificStep() function, which does nothing but being virtual, so it can be overloaded to perform specific stuff at this step by specific optimizers that would need to do so.

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

Definition at line 355 of file vOptimizer.cc.

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public virtual int vOptimizer::ReadConfigurationFile ( const string & a_configurationFile )

pure 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 a child optimizer, from a configuration file. It is pure virtual so is implemented by children. 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.

Implemented in iOptimizerNEGML, iOptimizerOriginalAML, iOptimizerLandweber, iOptimizerMLEM, and iOptimizerTemplate.

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public virtual int vOptimizer::ReadOptionsList ( const string & a_optionsList )

pure virtual

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

Parameters

const string& a_optionsList

This function implements the reading of all options associated to a child optimizer, from a list of options. It is pure virtual so is implemented by children. 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.

Implemented in iOptimizerNEGML, iOptimizerOriginalAML, iOptimizerLandweber, iOptimizerMLEM, and iOptimizerTemplate.

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

privatepure virtual

A private function used to compute the sensitivity weight associated to the provided data.

Parameters

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

This function is pure virtual, so must be implemented by specific optimizers. The computed sensitivity term must be put at the ap_weight pointer. All potentially useful information is provided as parameters. Note that the multiplicate corrections parameter only includes such correction specific to the event; in other words, it does not include the quantification factor which is given separately.

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

Implemented in iOptimizerNEGML, iOptimizerOriginalAML, iOptimizerLandweber, iOptimizerTemplate, and iOptimizerMLEM.

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public inline void vOptimizer::SetAttenuationImage	(	FLTNB *	ap_attenuationImage,
		int	a_thread
	)

inline

Set the attenuation image corresponding to the current thread and current event.

Parameters

FLTNB*	ap_attenuationImage
int	a_thread

Definition at line 498 of file vOptimizer.hh.

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public inline void vOptimizer::SetDataMode ( int a_dataMode )

inline

Set the data mode in use.

Parameters

int	a_dataMode

Definition at line 483 of file vOptimizer.hh.

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public inline void vOptimizer::SetDataType ( int a_dataType )

inline

Set the data type in use.

Parameters

int	a_dataType

Definition at line 490 of file vOptimizer.hh.

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public inline void vOptimizer::SetFOMFlag ( bool a_optimizerFOMFlag )

inline

Set the FOM flag specifying if figures-of-merit will be computed or not.

Parameters

bool	a_optimizerFOMFlag

Definition at line 505 of file vOptimizer.hh.

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public inline void vOptimizer::SetImageDimensionsAndQuantification ( oImageDimensionsAndQuantification * ap_ImageDimensionsAndQuantification )

inline

Set the pointer to the image dimensions in use.

Parameters

oImageDimensionsAndQuantification* ap_ImageDimensionsAndQuantification

Definition at line 469 of file vOptimizer.hh.

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public inline void vOptimizer::SetImageStatFlag ( bool a_optimizerImageStatFlag )

inline

Set the image stat flag specifying if basic statistics about image udpate will be computed or not.

Parameters

bool	a_optimizerImageStatFlag

Definition at line 512 of file vOptimizer.hh.

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public inline void vOptimizer::SetNbTOFBins ( int a_nbTOFBins )

inline

Set the number of TOF bins in use.

Parameters

int	a_nbTOFBins

Definition at line 476 of file vOptimizer.hh.

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public inline void vOptimizer::SetVerbose ( int a_verbose )

inline

Set the verbose level.

Parameters

int	a_verboseLevel

Definition at line 462 of file vOptimizer.hh.

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void vOptimizer::ShowHelp ( )

A function used to show help about the optimizer.

This function simply calls the ShowHelpSpecific() function implemented by children.

Definition at line 190 of file vOptimizer.cc.

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private virtual void vOptimizer::ShowHelpSpecific ( )

privatepure virtual

A function used to show help about the child module.

This function must describe what the optimizer 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 pure virtual so is implemented by children. It is private because called by the public ShowHelp() function.

Implemented in iOptimizerNEGML, iOptimizerOriginalAML, iOptimizerLandweber, iOptimizerTemplate, and iOptimizerMLEM.

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int vOptimizer::UpdateVisitedVoxels ( oImageSpace * ap_Image )

A public function used to update the 'visited' voxels after each subset.

Parameters

oImageSpace* ap_Image

This function is called at the end of each subset. Based on the sensitivity image, it labels which voxel has been visited or not during each subset. At the end of the iteration, all voxels that have not been visited in any subset are set to 0. There is a dedicated matrix in the oImageSpace to keep track of visited voxels. Practically, this avoids having those never visited voxels trapped in their initial value if the latter is different from 0.

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

Definition at line 731 of file vOptimizer.cc.

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Member Data Documentation

FLTNB** vOptimizer::m2p_attenuationImage

protected

The attenuation image currently in use for the current event, one per thread (used for SPECT)

Definition at line 594 of file vOptimizer.hh.

FLTNB** vOptimizer::m2p_forwardValues

protected

Buffer for forward projected values, as many as threads and as many as TOF bins

Definition at line 585 of file vOptimizer.hh.

FLTNB*** vOptimizer::m3p_backwardValues

protected

Buffer for values to be back-projected, as many as threads, as many as TOF bins and as many as backward images

Definition at line 586 of file vOptimizer.hh.

FLTNB**** vOptimizer::m4p_FOMLogLikelihood

protected

The log-likelihood FOM, as many as frames, respiratory gates, cardiac gates and threads

Definition at line 597 of file vOptimizer.hh.

uint64_t**** vOptimizer::m4p_FOMNbBins

protected

The number of bins contributing to the FOM computation, as many as frames, respiratory gates, cardiac gates and threads

Definition at line 599 of file vOptimizer.hh.

double**** vOptimizer::m4p_FOMNbData

protected

The number of data (counts) contributing to the FOM computation, as many as frames, respiratory gates, cardiac gates and threads

Definition at line 600 of file vOptimizer.hh.

FLTNB**** vOptimizer::m4p_FOMRMSE

protected

The RMSE FOM, as many as frames, respiratory gates, cardiac gates and threads

Definition at line 598 of file vOptimizer.hh.

int vOptimizer::m_dataMode

protected

The mode of the data (list-mode or histogram)

Definition at line 592 of file vOptimizer.hh.

int vOptimizer::m_dataType

protected

The type of the data (PET, SPECT, ...)

Definition at line 593 of file vOptimizer.hh.

bool vOptimizer::m_histogramCompatibility

protected

A flag saying if the optimizer is compatible with histogram data

Definition at line 589 of file vOptimizer.hh.

FLTNB vOptimizer::m_initialValue

protected

The initial value of the image for the specific optimizer

Definition at line 587 of file vOptimizer.hh.

bool vOptimizer::m_listmodeCompatibility

protected

A flag saying if the optimizer is compatible with list-mode data

Definition at line 588 of file vOptimizer.hh.

int vOptimizer::m_nbBackwardImages

protected

The number of backward images used by the specific optimizer

Definition at line 583 of file vOptimizer.hh.

int vOptimizer::m_nbTOFBins

protected

The number of TOF bins in use

Definition at line 584 of file vOptimizer.hh.

bool vOptimizer::m_optimizerFOMFlag

protected

A flag saying if figures-of-merit are computed in the data space

Definition at line 596 of file vOptimizer.hh.

bool vOptimizer::m_optimizerImageStatFlag

protected

A flag saying if some basic statistics about image update are computed

Definition at line 602 of file vOptimizer.hh.

int vOptimizer::m_verbose

protected

The verbose level

Definition at line 582 of file vOptimizer.hh.

double* vOptimizer::mp_correctionStatMean

protected

The mean additive update correction value, one per thread to be thread safe

Definition at line 608 of file vOptimizer.hh.

double* vOptimizer::mp_correctionStatVariance

protected

The variance of additive update correction values, one per thread to be thread safe

Definition at line 609 of file vOptimizer.hh.

oImageDimensionsAndQuantification* vOptimizer::mp_ImageDimensionsAndQuantification

protected

Pointer to the image dimensions and quantification object

Definition at line 591 of file vOptimizer.hh.

FLTNB* vOptimizer::mp_imageStatMax

protected

The maximum image value, one per thread to be thread safe

Definition at line 605 of file vOptimizer.hh.

double* vOptimizer::mp_imageStatMean

protected

The mean image value, one per thread to be thread safe

Definition at line 606 of file vOptimizer.hh.

FLTNB* vOptimizer::mp_imageStatMin

protected

The minimum image value, one per thread to be thread safe

Definition at line 604 of file vOptimizer.hh.

INTNB* vOptimizer::mp_imageStatNbVox

protected

The number of voxels contributing to the image statistics, one per thread to be thread safe

Definition at line 603 of file vOptimizer.hh.

double* vOptimizer::mp_imageStatVariance

protected

The image variance value, one per thread to be thread safe

Definition at line 607 of file vOptimizer.hh.

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

Public Member Functions

Protected Member Functions

Protected Attributes

Private Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation