irtkMultipleImageFreeFormRegistration Class Reference

#include <irtkMultipleImageFreeFormRegistration.h>

Inheritance diagram for irtkMultipleImageFreeFormRegistration:

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Collaboration diagram for irtkMultipleImageFreeFormRegistration:

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List of all members.

Detailed Description

Filter for non-rigid registration based on voxel similarity measures.

This class implements a registration filter for the non-rigid registration of two images. The basic algorithm is described in Rueckert et al., IEEE Transactions on Medical Imaging, In press.

Definition at line 33 of file irtkMultipleImageFreeFormRegistration.h.


Public Member Functions
	irtkMultipleImageFreeFormRegistration ()
	Constructor.
virtual void	SetOutput (irtkTransformation *)
	Set output for the registration filter.
virtual const char *	NameOfClass ()
	Returns the name of the class.
virtual void	Print ()
	Print some information.
virtual void	GuessParameter ()
	Guess parameters.
virtual Bool	Read (char , char , int &)
	Read single line of registration parameters.
virtual void	Write (ostream &)
	Write registration parameters to file.
virtual	SetMacro (DX, double)
virtual	GetMacro (DX, double)
virtual	SetMacro (DY, double)
virtual	GetMacro (DY, double)
virtual	SetMacro (DZ, double)
virtual	GetMacro (DZ, double)
virtual	SetMacro (SpeedupFactor, double)
virtual	GetMacro (SpeedupFactor, double)
Protected Member Functions
virtual void	Initialize ()
	Initial set up for the registration.
virtual void	Initialize (int)
	Initial set up for the registration.
virtual void	Finalize ()
	Final set up for the registration.
virtual void	Finalize (int)
	Final set up for the registration.
virtual double	SmoothnessPenalty ()
	Evaluates the smoothness preservation term.
virtual double	SmoothnessPenalty (int)
	Evaluates the smoothness term.
virtual double	VolumePreservationPenalty ()
	Evaluates the volume preservation term.
virtual double	VolumePreservationPenalty (int)
	Evaluates the volume preservation term.
virtual double	TopologyPreservationPenalty ()
	Evaluates the topology preservation term.
virtual double	TopologyPreservationPenalty (int)
	Evaluates the topology preservation term.
virtual double	Evaluate ()
	Evaluates the registration.
virtual double	EvaluateDerivative (int, double)
	Evaluates the registration.
virtual double	EvaluateGradient (float, float *)
	Evaluates the gradient of the similarity metric.
virtual void	UpdateLUT ()
	Update lookup table.
Protected Attributes
irtkBSplineFreeFormTransformation *	_affd
	Pointer to the local transformation which is currently optimized.
irtkMultiLevelFreeFormTransformation *	_mffd
	Pointer to the global transformation which is constant.
irtkSimilarityMetric *	_tmpMetricA
	Used as temporary memory for metric.
irtkSimilarityMetric *	_tmpMetricB
float **	_mffdLookupTable
	Used as lookup table for transformed coordinates up to level n-1.
float **	_affdLookupTable
	Used as lookup table for transformed coordinates including level n.
float *	_localLookupTable
	Used as lookup table for the contribution of each control point.
double	_Lambda1
	Smoothness parameter for non-rigid registration.
double	_Lambda2
	Volume preservation parameter for non-rigid registration.
double	_Lambda3
	Topology preservation parameter for non-rigid registration.
double	_DX
	Control point spacing in the x-direction.
double	_DY
	Control point spacing in the y-direction.
double	_DZ
	Control point spacing in the z-direction.
Bool	_Subdivision
	Subdivide FFD between resolution levels.
double	_SpeedupFactor
	Speedup factor when calculating derivative.
Friends
float	irtkFreeFormRegistration_Ptr2NRfunc (float *x)
	Friend declaration of NR optimization routines.
void	irtkFreeFormRegistration_Ptr2NRdfunc (float x, float dx)
	Friend declaration of NR optimization routines.

Member Function Documentation

virtual double irtkMultipleImageFreeFormRegistration::SmoothnessPenalty ( ) [protected, virtual]

Evaluates the smoothness preservation term.

virtual double irtkMultipleImageFreeFormRegistration::SmoothnessPenalty ( int ) [protected, virtual]

Evaluates the smoothness term.

virtual double irtkMultipleImageFreeFormRegistration::VolumePreservationPenalty ( ) [protected, virtual]

Evaluates the volume preservation term.

virtual double irtkMultipleImageFreeFormRegistration::VolumePreservationPenalty ( int ) [protected, virtual]

Evaluates the volume preservation term.

virtual double irtkMultipleImageFreeFormRegistration::TopologyPreservationPenalty ( ) [protected, virtual]

Evaluates the topology preservation term.

virtual double irtkMultipleImageFreeFormRegistration::TopologyPreservationPenalty ( int ) [protected, virtual]

Evaluates the topology preservation term.

virtual double irtkMultipleImageFreeFormRegistration::Evaluate ( ) [protected, virtual]

Evaluates the registration.

Implements irtkMultipleImageRegistration.

virtual double irtkMultipleImageFreeFormRegistration::EvaluateDerivative	(	int	,
		double
	)			`[protected, virtual]`

Evaluates the registration.

This function evaluates the registration by looping over the target image and interpolating the transformed source image while filling the joint histogram. This function returns the value of the similarity measure using Similarity(). This function uses the cached result of any previous call to Evaluate() and recalculates the similarity measure in the specified region of interest.

virtual double irtkMultipleImageFreeFormRegistration::EvaluateGradient	(	float	,
		float *
	)			`[protected, virtual]`

Evaluates the gradient of the similarity metric.

This function evaluates the gradient of the similarity metric of the registration by looping over the target image and interpolating the transformed source image while filling the joint histogram. The partial derivatives are approximated using a finite difference scheme. The step size for the finite difference scheme is passed as a parameter to the function. The function returns the norm of the gradient vector as well as the gradient vector containing the partial derivatives.

Reimplemented from irtkMultipleImageRegistration.