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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkDiffusionTensor3D.h.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:34 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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#ifndef __itkDiffusionTensor3D_h |
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#define __itkDiffusionTensor3D_h |
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// Undefine an eventual DiffusionTensor3D macro |
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#ifdef DiffusionTensor3D |
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#undef DiffusionTensor3D |
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#endif |
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#include <itkSymmetricSecondRankTensor.h> |
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namespace itk |
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{ |
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/** \class DiffusionTensor3D |
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* \brief Represent a diffusion tensor as used in DTI images. |
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* |
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* This class implements a 3D symmetric tensor as it is used for representing |
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* diffusion of water molecules in Diffusion Tensor Images. |
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* |
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* This class derive from the SymmetricSecondRankTensor and from it inherit |
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* most of the Tensor related behavior. At this level we add the methods that |
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* are specific to 3D and that are closely related to the concept of diffusion. |
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* |
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* |
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* \author Jeffrey Duda from School of Engineering at University of Pennsylvania |
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* \author Torsten Rohlfing from SRI International Neuroscience Program. |
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* |
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* This class was mostly based on files that Jeffrey Duda, Torsten Rohlfing and |
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* Martin Styner contributed to the ITK users list during a discussion on |
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* support for DiffusionTensorImages. A discussion on the design of this class |
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* can be found in the WIKI pages of NAMIC: |
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* |
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* http://www.na-mic.org/Wiki/index.php/NAMIC_Wiki:DTI:ITK-DiffusionTensorPixelType |
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* |
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* \note This work is part of the National Alliance for Medical Image |
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* Computing (NAMIC), funded by the National Institutes of Health |
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* through the NIH Roadmap for Medical Research, Grant U54 EB005149. |
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* Information on the National Centers for Biomedical Computing |
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* can be obtained from http://nihroadmap.nih.gov/bioinformatics. |
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* |
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* |
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* \note Contributions by Torsten Rohlfing were funded by the following NIH grants |
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* |
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* Alcohol, HIV and the Brain, |
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* NIAAA AA12999, PI: A. Pfefferbaum |
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* |
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* Normal Aging of Brain Structure and Function |
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* NIA AG 17919, PI: E.V. Sullivan. |
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* |
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* |
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* \par References |
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* E. R. Melhem, S. Mori, G. Mukundan, M. A. Kraut, M. G. Pomper, and |
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* P. C. M. van Zijl, "Diffusion tensor MR imaging of the brain and white |
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* matter tractography," Am. J. Roentgenol., vol. 178, pp. 3-16, 2002. |
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* |
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* \sa SymmetricSecondRankTensor |
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* |
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* \ingroup ImageObjects TensorObjects Geometry |
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*/ |
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template < typename TComponent > |
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class DiffusionTensor3D: public SymmetricSecondRankTensor<TComponent,3> |
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{ |
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public: |
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/** Standard class typedefs. */ |
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typedef DiffusionTensor3D Self; |
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TDA |
typedef SymmetricSecondRankTensor<TComponent, 3> Superclass; |
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/** Propagating some typedef from the superclass */ |
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typedef typename Superclass::ValueType ValueType; |
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typedef typename Superclass::ComponentType ComponentType; |
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#if defined(__GNUC__) && !defined(__INTEL_COMPILER) && (__GNUC__ == 3 && __GNUC_MINOR__ == 2 && __GNUC_PATCHLEVEL__ == 3) |
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typedef ComponentType ComponentArrayType[6]; |
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#else |
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typedef typename Superclass::ComponentArrayType ComponentArrayType; |
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#endif |
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typedef typename Superclass::AccumulateValueType AccumulateValueType; |
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typedef typename Superclass::RealValueType RealValueType; |
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typedef typename Superclass::EigenValuesArrayType EigenValuesArrayType; |
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typedef typename Superclass::EigenVectorsMatrixType EigenVectorsMatrixType; |
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/** Default Constructor. */ |
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DiffusionTensor3D(); |
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/** Constructor with initialization. */ |
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DiffusionTensor3D(const Self& r); |
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DiffusionTensor3D(const Superclass& r); |
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DiffusionTensor3D(const ComponentType& r); |
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DiffusionTensor3D(const ComponentArrayType r); |
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/** Pass-through assignment operator for the Array base class. */ |
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Self& operator= (const Self& r); |
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Self& operator= (const Superclass & r); |
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Self& operator= (const ComponentType& r); |
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Self& operator= (const ComponentArrayType r); |
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/** Get Trace value */ |
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AccumulateValueType GetTrace() const; |
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/** Get the value of Fractional Anisotropy from the Tensor. */ |
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RealValueType GetFractionalAnisotropy() const; |
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/** Get the value of Relative Anisotropy from the Tensor. */ |
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RealValueType GetRelativeAnisotropy() const; |
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/** Get the Inner Scalar Product from the Tensor. */ |
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RealValueType GetInnerScalarProduct() const; |
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}; |
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} // end namespace itk |
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#ifndef ITK_MANUAL_INSTANTIATION |
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#include "itkDiffusionTensor3D.txx" |
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#endif |
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#endif |
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