Difference between revisions of "Slicer3:DTMRI"

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= Core infrastructure for DT-MRI processing and visualization, fiber processing and visualization =
 
= Core infrastructure for DT-MRI processing and visualization, fiber processing and visualization =
== Data Model ==
+
* MRML nodes for data representation, storage, and display. MRML nodes store data and the state of Slicer modules.
 +
* Data display and processing logic components.
 +
* GUI components.
 +
 
 +
== Data Representation ==
 
MRML nodes for different data representations involved in DTI analysis:
 
MRML nodes for different data representations involved in DTI analysis:
 
* Diffusion Weighted Images: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLDiffusionWeightedVolumeNode.h?view=log vtkMRMLDiffusionWeightedVolumeNode].
 
* Diffusion Weighted Images: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLDiffusionWeightedVolumeNode.h?view=log vtkMRMLDiffusionWeightedVolumeNode].
 
* Diffusion Tensor Images:  [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLDiffusionTensorVolumeNode.h?view=log vtkMRMLDiffusionTensorVolumeNode].
 
* Diffusion Tensor Images:  [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLDiffusionTensorVolumeNode.h?view=log vtkMRMLDiffusionTensorVolumeNode].
 
* Fiber Bundles: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLFiberBundleNode.h?view=log vtkMRMLFiberBundleNode].
 
* Fiber Bundles: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLFiberBundleNode.h?view=log vtkMRMLFiberBundleNode].
 +
 +
==Data Storage and I/O ==
 +
* DWI and DTI I/O: NRRD is the format supported by Slicer 3 for storing DWI and DTI images.
 +
** NNRD reader/writer: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/vtkTeem/vtkNRRDReader.h?view=log vtkNRRDReader] and [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/vtkTeem/vtkNRRDWriter.h?view=log vtkNRRDWriter].
 +
** MRML Storage node: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLNRRDStorageNode.h?view=log vtkMRMLNRRDStorageNode].
 +
* Fiber I/O: vtkPolyData has been the format adopted for the description of fibers.
 +
** MRML Storage node: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLFiberBundleStorageNode.h?view=log vtkMRMLFiberBundleStorageNode]
 +
* Slicer3 Volume module is capable of loading and saving DWI and DTI images.
 +
* Slicer3 Models and Tractography LoadSave modules are capable of loading and saving fiber tracts.
  
 
== Visualization/Display  ==
 
== Visualization/Display  ==
MRML nodes for definition for DTI data visualization:
+
MRML nodes for DWI, DTI, Tractography data visualization:
 
* Diffusion Weighted Images: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLDiffusionWeightedVolumeDisplayNode.h?view=log vtkMRMLDiffusionWeightedVolumeDisplayNode].
 
* Diffusion Weighted Images: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLDiffusionWeightedVolumeDisplayNode.h?view=log vtkMRMLDiffusionWeightedVolumeDisplayNode].
 
* Diffusion Tensor Images:  [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLDiffusionTensorVolumeDisplayNode.h?view=log vtkMRMLDiffusionTensorVolumeDisplayNode], and [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLDiffusionTensorDisplayPropertiesNode.h?view=log vtkMRMLDiffusionTensorDisplayPropertiesNode].
 
* Diffusion Tensor Images:  [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLDiffusionTensorVolumeDisplayNode.h?view=log vtkMRMLDiffusionTensorVolumeDisplayNode], and [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLDiffusionTensorDisplayPropertiesNode.h?view=log vtkMRMLDiffusionTensorDisplayPropertiesNode].
 
* Fiber Bundles: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLFiberBundleDisplayNode.h?view=log vtkMRMLFiberBundleDisplayNode], [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLFiberBundleLineDisplayNode.h?view=log vtkMRMLFiberBundleLineDisplayNode], [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLFiberBundleTubeDisplayNode.h?view=log vtkMRMLFiberBundleTubeDisplayNode], and [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLFiberBundleGlyphDisplayNode.h?view=log vtkMRMLFiberBundleGlyphDisplayNode].
 
* Fiber Bundles: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLFiberBundleDisplayNode.h?view=log vtkMRMLFiberBundleDisplayNode], [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLFiberBundleLineDisplayNode.h?view=log vtkMRMLFiberBundleLineDisplayNode], [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLFiberBundleTubeDisplayNode.h?view=log vtkMRMLFiberBundleTubeDisplayNode], and [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLFiberBundleGlyphDisplayNode.h?view=log vtkMRMLFiberBundleGlyphDisplayNode].
  
==Storage and I/O ==
 
* DWI and DTI I/O: NRRD is the format supported by Slicer 3 for storing DWI and DTI images.
 
** NNRD reader/writer: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/vtkTeem/vtkNRRDReader.h?view=log vtkNRRDReader] and [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/vtkTeem/vtkNRRDWriter.h?view=log vtkNRRDWriter].
 
** Storage node: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLNRRDStorageNode.h?view=log vtkMRMLNRRDStorageNode].
 
* Fiber I/O: vtkPolyData has been the format adopted for the description of fibers.
 
** Storage node: [http://www.na-mic.org/ViewVC/index.cgi/trunk/Libs/MRML/vtkMRMLFiberBundleStorageNode.h?view=log vtkMRMLFiberBundleStorageNode]
 
* Slicer3 Volume module is capable of loading and saving DWI and DTI images.
 
* Slicer3 Models and Tractography LoadSave modules are capable of loading and saving fiber tracts.
 
  
 
== Displaying Logic ==
 
== Displaying Logic ==

Revision as of 16:37, 9 January 2008

Home < Slicer3:DTMRI

Goals

  • Development of the core infrastructure for DT-MRI processing and visualization.
  • Development of the core infrastructure for fiber tracks processing and visualization.
  • Integration of new and existing methods and algorithms for DT-MRI processing using the provided infrastructure.
  • Porting of the current DT-MRI capabilities existing in Slicer 2.x

Core infrastructure for DT-MRI processing and visualization, fiber processing and visualization

  • MRML nodes for data representation, storage, and display. MRML nodes store data and the state of Slicer modules.
  • Data display and processing logic components.
  • GUI components.

Data Representation

MRML nodes for different data representations involved in DTI analysis:

Data Storage and I/O

  • DWI and DTI I/O: NRRD is the format supported by Slicer 3 for storing DWI and DTI images.
  • Fiber I/O: vtkPolyData has been the format adopted for the description of fibers.
  • Slicer3 Volume module is capable of loading and saving DWI and DTI images.
  • Slicer3 Models and Tractography LoadSave modules are capable of loading and saving fiber tracts.

Visualization/Display

MRML nodes for DWI, DTI, Tractography data visualization:


Displaying Logic

  • Visualization pipelines for DTI, DWI volumes, and fiber bundles are incorporated into the corresponding display nodes.
  • DWI volumes are displayed as separate components.
  • DTI volumes are displayed as computed scalar properties (such as FA, Linear Measure, Color Orientation, etc.)
Colore DTI
DTI volume slices colored by orientaion.


  • Fiber bundles are displayed as lines, tubes, and glyphs with their own properties and colors.
fiber bundles
Fiber bundles displayed as lines and glyph ellipsoids.


  • Slicer3 Volume Module is capable of displaying DWI and DTI images.
  • Slicer3 Models and Tractography LoadSave modules are capable of displaying fiber tracts.

Diffusion Processing Toolbox

vtkTeem-library provides tools for:
  • Tensor estimation
  • Computation of scalar measurements from tensor fields
  • Fast rendering of tensor fields using glyphs: line, box, ellipsoid.
  • Fiber Tracking using integration techniques
  • Multiple ROI seeding and logic interconnections between ROIs

DT-MRI processing and visualization Modules

Tensor Estimation from DWI

Teem currently provides a clean interface to do this estimation in a voxel by voxel fashion. Collaboration with Gordon Kindlmann for a vtk filter implementation that encapsulates the estimation process (vtkTeemEstimateDiffusionTensor).

Diffusion Tensor Scalar Measurements

Rician LMMSE Filter

  • Filters a set of diffusion weighted images in the mean squared error sense using a Rician noise model. The noise parameter is automatically estimated.
  • Contributed by Santiago Aja Fernandez and Marc Niethammer
  • Additional Rician filtering module provided by Sylvain Gouttard et al

Tractography Display/Load/Save Module

  • Loads and saves fiber tracks as vtkPolyData files (.vtp)
  • Displays fiber tracks as lines, tubes, glyphs. Allows to control line/tube/glyph display properties and colors
  • Built-in Slicer3 module.

Tractography ROI Seeding Module

  • Creates fibers passing through a specified ROI
  • CLI Module: ROI Seeding.
Roi seeding
Seeding from ROI example.


Tractography Fiducial Seeding Module

fiducial seeding
Seeding from fiducials example.


Tractography ROI Select Module

  • Select tracts passing or not passing through ROIs
  • CLI Module: ROI Select.

Stochastic Tractography Filter

  • CLI Module: StochasticTractographyFilter.
  • Generates a map of connectivity probabilities from a DWI volume.).
  • Contributed by Tri Ngo (tringo@gmail.com)

ROI Tract Filter

  • CLI Module: ROITractFilter.
  • Creates a new tract container containing only tracts which pass through the selected ROI's.
  • Contributed by Tri Ngo (tringo@gmail.com)

Generate Connectivity Map

  • CLI Module: GenerateConnectivityMap.
  • Generates a volume where the value of each voxel is the number of fibers which pass through that voxel divided by the total number of sampled fibers. This value can been interpreted as the probability that a particular voxel is connected to the seed ROI by a fiber tract.
  • Contributed by Tri Ngo (tringo@gmail.com)


Future development plans

  • Fiber editing: enviroment for manually editing individual fibers/bundles, reassigning of fibers to bundles.
  • Fiber Bundle Clustering (Core 1).
  • Render glyphs in the 2D slice windows.
  • Statistics along fiber tracts (Core 1).
  • Quantitative measurement
    • Tract-based
    • Region of interest-based
  • fMRI seeding
  • Surgical planning
  • DT-MRI segmentation/atlas creation: enviroment for segmentation of DT-MRI fields
  • DT-MRI registration: enviroment for registration of DT-MRI fields (possibly via DWI registration -- work done at GE and presented in MICCAI '06).
  • Tensor estimation using different methods, namely:
    • Least Squares
    • Weighted Least Squares
    • Non-linear methods
    • Maximum Likelihood approach

Development Screenshots

DtiDevel1.jpg

DtiDevel2.jpg

Notes on general diffusion framework (ODF/2 tensor) support

http://wiki.na-mic.org/Wiki/index.php/Slicer3:DTMRI:GeneralDiffusionFramework