Performes deterministic streamline tracking on the input tensor image. More...

#include <itkStreamlineTrackingFilter.h>

Inheritance diagram for itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >:

Collaboration diagram for itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >:

Public Types
typedef StreamlineTrackingFilter	Self

typedef SmartPointer< Self >	Pointer

typedef SmartPointer< const Self >	ConstPointer

typedef ImageToImageFilter< Image< DiffusionTensor3D< TTensorPixelType >, 3 >, Image< Vector< TPDPixelType, 3 >, 3 > >	Superclass

typedef TTensorPixelType	TensorComponentType

typedef TPDPixelType	DirectionPixelType

typedef Superclass::InputImageType	InputImageType

typedef Superclass::OutputImageType	OutputImageType

typedef Superclass::OutputImageRegionType	OutputImageRegionType

typedef itk::Image< unsigned char, 3 >	ItkUcharImgType

typedef itk::Image< double, 3 >	ItkDoubleImgType

typedef itk::Image< float, 3 >	ItkFloatImgType

typedef itk::Image< vnl_vector_fixed< double, 3 >, 3 >	ItkPDImgType

typedef vtkSmartPointer< vtkPolyData >	FiberPolyDataType

Public Member Functions
Pointer	Clone () const

virtual const char *	GetClassName () const

virtual FiberPolyDataType	GetFiberPolyData ()
	Output fibers. More...

virtual void	SetSeedImage (ItkUcharImgType::Pointer _arg)
	Seeds are only placed inside of this mask. More...

virtual void	SetMaskImage (ItkUcharImgType::Pointer _arg)
	Tracking is only performed inside of this mask image. More...

virtual void	SetFaImage (ItkFloatImgType::Pointer _arg)
	Use this FA image instead of the automatically calculated one. Necessary for multi tensor tracking. More...

virtual void	SetSeedsPerVoxel (int _arg)
	One seed placed in the center of each voxel or multiple seeds randomly placed inside each voxel. More...

virtual void	SetFaThreshold (double _arg)
	FA termination criterion. More...

virtual void	SetStepSize (double _arg)
	Integration step size in mm. More...

virtual void	SetF (double _arg)
	Tensor deflection parameter f. More...

virtual void	SetG (double _arg)
	Tensor deflection parameter g. More...

virtual void	SetInterpolate (bool _arg)
	Toggle between nearest neighbour (false) and trilinear interpolation (true) More...

virtual void	SetMinTractLength (double _arg)
	Shorter tracts are discarded. More...

virtual double	GetMinTractLength ()

virtual void	SetMinCurvatureRadius (double _arg)
	Tracking is stopped if curvature radius (in mm) is too small. More...

virtual double	GetMinCurvatureRadius ()

virtual void	SetResampleFibers (bool _arg)
	If enabled, the resulting fibers are resampled to feature point distances of 0.5*MinSpacing. This is recommendable for very short integration steps and many seeds. If disabled, the resulting fiber bundle might become very large. More...

Static Public Member Functions
static Pointer	New ()

Protected Member Functions
	StreamlineTrackingFilter ()

	~StreamlineTrackingFilter ()

void	PrintSelf (std::ostream &os, Indent indent) const

void	CalculateNewPosition (itk::ContinuousIndex< double, 3 > &pos, vnl_vector_fixed< double, 3 > &dir, typename InputImageType::IndexType &index)
	Calculate next integration step. More...

double	FollowStreamline (itk::ContinuousIndex< double, 3 > pos, int dirSign, vtkPoints *points, std::vector< vtkIdType > &ids, int imageIdx)
	Start streamline in one direction. More...

bool	IsValidPosition (itk::ContinuousIndex< double, 3 > &pos, typename InputImageType::IndexType &index, vnl_vector_fixed< double, 8 > &interpWeights, int imageIdx)
	Are we outside of the mask image? Is the FA too low? More...

double	RoundToNearest (double num)

void	BeforeThreadedGenerateData ()

void	ThreadedGenerateData (const OutputImageRegionType &outputRegionForThread, ThreadIdType threadId)

void	AfterThreadedGenerateData ()

FiberPolyDataType	AddPolyData (FiberPolyDataType poly1, FiberPolyDataType poly2)
	Combine tracking results generated by the individual threads. More...

Protected Attributes
FiberPolyDataType	m_FiberPolyData

vtkSmartPointer< vtkPoints >	m_Points

vtkSmartPointer< vtkCellArray >	m_Cells

std::vector< ItkDoubleImgType::Pointer >	m_EmaxImage
	Stores largest eigenvalues per voxel (one for each tensor) More...

ItkFloatImgType::Pointer	m_FaImage
	FA image used to determine streamline termination. More...

std::vector< ItkPDImgType::Pointer >	m_PdImage
	Stores principal direction of each tensor in each voxel. More...

std::vector< typename InputImageType::Pointer >	m_InputImage
	Input tensor images. For multi tensor tracking provide multiple tensor images. More...

int	m_NumberOfInputs

double	m_FaThreshold

double	m_MinCurvatureRadius

double	m_StepSize

int	m_MaxLength

double	m_MinTractLength

int	m_SeedsPerVoxel

double	m_F

double	m_G

bool	m_Interpolate

double	m_PointPistance

bool	m_ResampleFibers

std::vector< int >	m_ImageSize

std::vector< double >	m_ImageSpacing

ItkUcharImgType::Pointer	m_SeedImage

ItkUcharImgType::Pointer	m_MaskImage

itk::VectorContainer< int, FiberPolyDataType >::Pointer	m_PolyDataContainer

Detailed Description

template<class TTensorPixelType, class TPDPixelType = double>
class itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >

Performes deterministic streamline tracking on the input tensor image.

Definition at line 42 of file itkStreamlineTrackingFilter.h.

Member Typedef Documentation

template<class TTensorPixelType , class TPDPixelType = double>

typedef SmartPointer<const Self> itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::ConstPointer

Definition at line 51 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef TPDPixelType itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::DirectionPixelType

Definition at line 62 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef vtkSmartPointer< vtkPolyData > itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::FiberPolyDataType

Definition at line 70 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef Superclass::InputImageType itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::InputImageType

Definition at line 63 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef itk::Image<double, 3> itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::ItkDoubleImgType

Definition at line 67 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef itk::Image<float, 3> itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::ItkFloatImgType

Definition at line 68 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef itk::Image< vnl_vector_fixed<double,3>, 3> itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::ItkPDImgType

Definition at line 69 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef itk::Image<unsigned char, 3> itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::ItkUcharImgType

Definition at line 66 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef Superclass::OutputImageRegionType itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::OutputImageRegionType

Definition at line 65 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef Superclass::OutputImageType itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::OutputImageType

Definition at line 64 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef SmartPointer<Self> itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::Pointer

Definition at line 50 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef StreamlineTrackingFilter itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::Self

Definition at line 49 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef ImageToImageFilter< Image< DiffusionTensor3D<TTensorPixelType>, 3 >, Image< Vector< TPDPixelType, 3 >, 3 > > itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::Superclass

Definition at line 52 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

typedef TTensorPixelType itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::TensorComponentType

Definition at line 61 of file itkStreamlineTrackingFilter.h.

Constructor & Destructor Documentation

template<class TTensorPixelType , class TPDPixelType >

itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::StreamlineTrackingFilter ( )

protected

Definition at line 37 of file itkStreamlineTrackingFilter.cpp.

template<class TTensorPixelType , class TPDPixelType = double>

itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::~StreamlineTrackingFilter ( )

inlineprotected

Definition at line 90 of file itkStreamlineTrackingFilter.h.

Member Function Documentation

template<class TTensorPixelType , class TPDPixelType >

vtkSmartPointer< vtkPolyData > itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::AddPolyData	(	FiberPolyDataType	poly1,
		FiberPolyDataType	poly2
	)

protected

Combine tracking results generated by the individual threads.

Definition at line 836 of file itkStreamlineTrackingFilter.cpp.

References mitk::New().

template<class TTensorPixelType , class TPDPixelType >

void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::AfterThreadedGenerateData ( )

protected

Definition at line 870 of file itkStreamlineTrackingFilter.cpp.

References MITK_INFO.

template<class TTensorPixelType , class TPDPixelType >

void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::BeforeThreadedGenerateData ( void )

protected

Definition at line 75 of file itkStreamlineTrackingFilter.cpp.

References MITK_INFO, and mitk::New().

template<class TTensorPixelType , class TPDPixelType >

void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::CalculateNewPosition	(	itk::ContinuousIndex< double, 3 > &	pos,
		vnl_vector_fixed< double, 3 > &	dir,
		typename InputImageType::IndexType &	index
	)

protected

Calculate next integration step.

Definition at line 234 of file itkStreamlineTrackingFilter.cpp.

References mitk::eps.

template<class TTensorPixelType , class TPDPixelType = double>

Pointer itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::Clone ( ) const

template<class TTensorPixelType , class TPDPixelType >

double itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::FollowStreamline	(	itk::ContinuousIndex< double, 3 >	pos,
		int	dirSign,
		vtkPoints *	points,
		std::vector< vtkIdType > &	ids,
		int	imageIdx
	)

protected

Start streamline in one direction.

Definition at line 467 of file itkStreamlineTrackingFilter.cpp.

References mitk::eps.

template<class TTensorPixelType , class TPDPixelType = double>

virtual const char* itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::GetClassName ( ) const

virtual

Runtime information support.

template<class TTensorPixelType , class TPDPixelType = double>

virtual FiberPolyDataType itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::GetFiberPolyData ( )

virtual

Output fibers.

template<class TTensorPixelType , class TPDPixelType = double>

virtual double itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::GetMinCurvatureRadius ( )

virtual

template<class TTensorPixelType , class TPDPixelType = double>

virtual double itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::GetMinTractLength ( )

virtual

template<class TTensorPixelType , class TPDPixelType >

bool itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::IsValidPosition	(	itk::ContinuousIndex< double, 3 > &	pos,
		typename InputImageType::IndexType &	index,
		vnl_vector_fixed< double, 8 > &	interpWeights,
		int	imageIdx
	)

protected

Are we outside of the mask image? Is the FA too low?

Definition at line 391 of file itkStreamlineTrackingFilter.cpp.

template<class TTensorPixelType , class TPDPixelType = double>

static Pointer itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::New ( )

static

Method for creation through the object factory.

template<class TTensorPixelType , class TPDPixelType >

void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::PrintSelf	(	std::ostream &	os,
		Indent	indent
	)		const

protected

Definition at line 885 of file itkStreamlineTrackingFilter.cpp.

template<class TTensorPixelType , class TPDPixelType >

double itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::RoundToNearest ( double num )

protected

Definition at line 67 of file itkStreamlineTrackingFilter.cpp.

template<class TTensorPixelType , class TPDPixelType = double>

virtual void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::SetF ( double _arg )

virtual

Tensor deflection parameter f.

template<class TTensorPixelType , class TPDPixelType = double>

virtual void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::SetFaImage ( ItkFloatImgType::Pointer _arg )

virtual

Use this FA image instead of the automatically calculated one. Necessary for multi tensor tracking.

template<class TTensorPixelType , class TPDPixelType = double>

virtual void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::SetFaThreshold ( double _arg )

virtual

FA termination criterion.

template<class TTensorPixelType , class TPDPixelType = double>

virtual void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::SetG ( double _arg )

virtual

Tensor deflection parameter g.

template<class TTensorPixelType , class TPDPixelType = double>

virtual void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::SetInterpolate ( bool _arg )

virtual

Toggle between nearest neighbour (false) and trilinear interpolation (true)

template<class TTensorPixelType , class TPDPixelType = double>

virtual void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::SetMaskImage ( ItkUcharImgType::Pointer _arg )

virtual

Tracking is only performed inside of this mask image.

template<class TTensorPixelType , class TPDPixelType = double>

virtual void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::SetMinCurvatureRadius ( double _arg )

virtual

Tracking is stopped if curvature radius (in mm) is too small.

template<class TTensorPixelType , class TPDPixelType = double>

virtual void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::SetMinTractLength ( double _arg )

virtual

Shorter tracts are discarded.

template<class TTensorPixelType , class TPDPixelType = double>

virtual void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::SetResampleFibers ( bool _arg )

virtual

If enabled, the resulting fibers are resampled to feature point distances of 0.5*MinSpacing. This is recommendable for very short integration steps and many seeds. If disabled, the resulting fiber bundle might become very large.

template<class TTensorPixelType , class TPDPixelType = double>

virtual void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::SetSeedImage ( ItkUcharImgType::Pointer _arg )

virtual

Seeds are only placed inside of this mask.

template<class TTensorPixelType , class TPDPixelType = double>

virtual void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::SetSeedsPerVoxel ( int _arg )

virtual

One seed placed in the center of each voxel or multiple seeds randomly placed inside each voxel.

template<class TTensorPixelType , class TPDPixelType = double>

virtual void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::SetStepSize ( double _arg )

virtual

Integration step size in mm.

template<class TTensorPixelType , class TPDPixelType >

void itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::ThreadedGenerateData	(	const OutputImageRegionType &	outputRegionForThread,
		ThreadIdType	threadId
	)

protected

Definition at line 736 of file itkStreamlineTrackingFilter.cpp.

References line, and mitk::New().

Member Data Documentation

template<class TTensorPixelType , class TPDPixelType = double>

vtkSmartPointer<vtkCellArray> itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_Cells

protected

Definition at line 106 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

std::vector< ItkDoubleImgType::Pointer > itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_EmaxImage

protected

Stores largest eigenvalues per voxel (one for each tensor)

Definition at line 108 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

double itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_F

protected

Definition at line 120 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

ItkFloatImgType::Pointer itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_FaImage

protected

FA image used to determine streamline termination.

Definition at line 109 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

double itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_FaThreshold

protected

Definition at line 114 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

FiberPolyDataType itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_FiberPolyData

protected

Definition at line 104 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

double itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_G

protected

Definition at line 121 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

std::vector< int > itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_ImageSize

protected

Definition at line 125 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

std::vector< double > itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_ImageSpacing

protected

Definition at line 126 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

std::vector< typename InputImageType::Pointer > itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_InputImage

protected

Input tensor images. For multi tensor tracking provide multiple tensor images.

Definition at line 111 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

bool itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_Interpolate

protected

Definition at line 122 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

ItkUcharImgType::Pointer itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_MaskImage

protected

Definition at line 128 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

int itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_MaxLength

protected

Definition at line 117 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

double itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_MinCurvatureRadius

protected

Definition at line 115 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

double itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_MinTractLength

protected

Definition at line 118 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

int itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_NumberOfInputs

protected

Definition at line 113 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

std::vector< ItkPDImgType::Pointer > itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_PdImage

protected

Stores principal direction of each tensor in each voxel.

Definition at line 110 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

double itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_PointPistance

protected

Definition at line 123 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

vtkSmartPointer<vtkPoints> itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_Points

protected

Definition at line 105 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

itk::VectorContainer< int, FiberPolyDataType >::Pointer itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_PolyDataContainer

protected

Definition at line 130 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

bool itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_ResampleFibers

protected

Definition at line 124 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

ItkUcharImgType::Pointer itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_SeedImage

protected

Definition at line 127 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

int itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_SeedsPerVoxel

protected

Definition at line 119 of file itkStreamlineTrackingFilter.h.

template<class TTensorPixelType , class TPDPixelType = double>

double itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >::m_StepSize

protected

Definition at line 116 of file itkStreamlineTrackingFilter.h.

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

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

template<class TTensorPixelType, class TPDPixelType = double> class itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

template<class TTensorPixelType, class TPDPixelType = double>
class itk::StreamlineTrackingFilter< TTensorPixelType, TPDPixelType >