na-mic national alliance for medical image computing diffusion tensor imaging tutorial sonia pujol,...
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![Page 1: NA-MIC National Alliance for Medical Image Computing Diffusion Tensor Imaging tutorial Sonia Pujol, PhD Surgical Planning Laboratory](https://reader033.vdocuments.mx/reader033/viewer/2022051613/5514ed3e550346b0338b5e03/html5/thumbnails/1.jpg)
NA-MICNational Alliance for Medical Image Computing http://na-mic.org
Diffusion Tensor Imaging tutorial
Sonia Pujol, PhD
Surgical Planning LaboratoryHarvard University
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National Alliance for Medical Image Computing http://na-mic.org © 2010, ARR
Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
DTI tutorial
This tutorial is an introduction to the advanced Diffusion MR capabilities of the Slicer3 software for medical image analysis.
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National Alliance for Medical Image Computing http://na-mic.org © 2010, ARR
Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Outline
This tutorial guides you through the process of loading diffusion MR data, estimating diffusion tensors, and performing tractography of white matter bundles.
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National Alliance for Medical Image Computing http://na-mic.org © 2010, ARR
Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
OutlineThe processing pipeline uses 9 image analysis modules of Slicer3.6
1. Data
2. Volumes
3. Diffusion Tensor Estimation
4. Diffusion Tensor Scalar Measurements
5. Editor
6. LabelMap Seeding
7. Fiber Bundles
8. Fiducials
9. Fiducial Seeding
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National Alliance for Medical Image Computing http://na-mic.org © 2010, ARR
Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Tutorial DatasetThe Diffusion MR tutorial dataset is composed of a
Diffusion Weighted MR scan of the brain acquired with 12
gradient directions and 2 baseline.
Diffusion Sensitizing Gradients
Diffusion Weighted
Images
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
DTI Processing Pipeline
DWI Acquisition
Tensor Calculation
Scalar Maps
3D Visualization
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Start Slicer3
Linux/Mac users
Launch the Slicer3
executable located in
the Slicer3.6 directory
Windows users
Select
Start All Programs
Slicer3-3.6-RC3-2010-06-04Slicer3
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National Alliance for Medical Image Computing http://na-mic.org © 2010, ARR
Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Slicer Welcome
The SlicerWelcome module is the module displayed by default.
This module gives an overview of the GUI of Slicer3, and data loading & saving functionalities.
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National Alliance for Medical Image Computing http://na-mic.org © 2010, ARR
Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Part 1:
Diffusion data loading and tensor estimation
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
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(Stejskal and Tanner 1965, Basser 1994 )
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Tutorial Dataset
The dataset used in this tutorial is inthe Nrrd file format, which is part ofthe NA-MIC kit.
To convert your own Dicom data toNrrd, use the module‘DicomToNrrdConverter’ in Slicer.
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
DicomToNrrd converter
The DICOMToNrrdConverter is located in the Converters category in the Modules’ menu
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
DicomToNrrd converter
A list of supported DWI formats can be found on the documentation page of the DicomToNrrdconverter:
http://www.slicer.org/slicerWiki/index.php/Modules:DicomToNRRD-3.6
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Loading the DWI volume
Select File Add Volume from the File menu
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Loading the DWI volume
Browse to the location of the Diffusion tutorial dataset directory and select the file dwiDataset.nhdr
Click on Apply to load the volume
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Loading the DWI volume
Left click on the menu Modules and select All Modules to display the list of 95 modules available for image analysis and 3D visualization.
Select the module Volumes
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Loading the DWI volume
Select the Active Volume dwiDataset and adjust the Window/Level Parameters
Slicer displays the anatomical views of the baseline volume of the diffusion dataset in the 2D Slice Viewer.
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Tensor Estimation
Left click on the menu Modules and select the module Diffusion Tensor Estimation.
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Tensor Estimation
Select the Input DWI Volume dwiDataset
Left click on OutputDTIVolume and select ‘Create New Diffusion Tensor Volume’
Left click on Output Baseline Volume and select ‘Create New Volume’
Left click on Otsu Threshold Mask and select ‘Create New Volume’
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Tensor Estimation
Select the Tensor Estimation Algorithm LS ( Least Squares), and click on Apply to estimate the tensors.
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Tensor Estimation
Left click on Output Baseline Volume to display the list of volumes that have been computed by Slicer
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Tensor EstimationOutput DTI Volume is the volume of estimated tensors
Output Baseline Volume is the Baseline volume
Output Threshold Mask is the tensor mask (blue)
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Tensor Estimation
Click on the link icon, left click on Output Threshold Mask and select None
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Tensor Estimation
Select the module Volumes in the modules’ toolbar
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Tensor Estimation
Select the Active Volume ‘Output Baseline Volume’ and click on the tab Display
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Tensor Estimation
Adjust the Window/Level parameters of the baseline volume using the slider
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Tensor Estimation
Browse through the baseline images, which correspond to the volumes that have been acquired without gradient.
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Part2:
Scalar Measurements
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Scalar Measurements
Select the category Diffusion--> Utilities from the list of modules, and left click on the Diffusion Tensor Scalar Measurements module.
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Scalar MeasurementsSelect the Input DTI Volume Output DTI Volume
Select the Output Scalar Volume ‘Create New Volume’
Select the Operation Fractional Anisotropy, and click on Apply
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Fractional Anisotropy Volume
Left click on the Slicer Viewer Menu icon, and select Show label volume outlines
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Slicer displays the outline of the tensor mask overlaid on the Fractional Anisotropy volume
Fractional Anisotropy Volume
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Move the mouse over the Fractional Anisotropy map to explore the FA values which range from 0 to 1, and are displayed in the bottom corner of the active (Bg) window.
Fractional Anisotropy Volume
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Part 3:
Region of Interest based Tractography
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LabelMap GenerationSelect the module Editor in the modules menu.
Select the Master Volume as ‘Output Scalar Volume’
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Label Map Generation
Click 'Set‘ and select ‘Create New’ to create the seeding label map.
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LabelMap Generation
Left click on the dropdown box and select Discrete and then select Labels.
Click Apply.
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LabelMap Generation
Left click on the Slicer Viewer Menu icon, and select the label map Output Scalar Volume-label
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LabelMap Generation
Left click on the Slicer Viewer Menu icon, andselect Don’t Show label volume outlines
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LabelMap Generation
Select the label 2 (pink), click on the icon Paint , set the radius to 2 and draw a region of interest within the corpus callosum in the sagittal view on a set of 2 or 3 slices
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LabelMap Seeding
Select the module Labelmap Seeding from the Modules’ menu
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LabelMap Seeding
Select the Input DTI volume ‘Output DTI Volume’
Select the Input Label Map ‘Output Scalar Volume -label’
Select Output Fiber Bundle ‘Create New Fiber Bundle’
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LabelMap Seeding
In the Seed Placement Options tab, select Use Index Space.
In the Tractography Seeding Parameters tab, select the ‘Stopping Mode’ Fractional Anisotropy, and use the default parameters for the minimum and maximum tract length, stopping value, stopping track curvature and integration step length.
In the Label Definition tab, set ‘Seeding label’ to label 2, and click on Apply
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LabelMap Seeding
The tracts generated within the corpus callosum region appear in the 3DViewer.
The color map used represent the FA values along the tracts.
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LabelMap SeedingSelect the module FiberBundles, and click on the tab Tube in the Display panel
Check the visibility box to display the tubes.
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LabelMap SeedingSlicer displays the computed tracts as tubes colored with FA values.
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Part 4:
Tractographyon-the-fly
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Fiducial SeedingSelect the module Fiducials
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Fiducial SeedingSet Fiducial List to Create New FiducialList
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Fiducial SeedingLeft click on FiducialList and select Rename
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Fiducial SeedingEnter the new name Seed and click on Apply
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Fiducial SeedingClick on the cross icon to add a fiducial to the list Seed
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Fiducial SeedingThe fiducial Seed-P appears in the 3D Viewer
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Fiducial Seeding
Position the fiducial in the cingulum region located above the corpus callosum
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Fiducial Seeding
Check the box to select the ‘Seed-P’ fiducial: we will use this fiducial to drive the tractography
Once selected, the fiducial Seed-P is displayed in pink letters in the 3D viewer.
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Fiducial Seeding
Select the module Fiducial Seeding
Set the Output FiberBundleNode to Create New FiberBundle
Important: this step must be done first
Set the DTI Volume to Output DTI Volume
Select the Fiducial List Seed
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Fiducial SeedingSet the Stopping Mode to Fractional Anisotropy and set the tractography parameters to the values that we used for the corpus callosum:
Stopping Value: 0.1
Stopping Track Curvature: 0.8
Step Length: 0.8 mm
Minimum Path Length: 10 mm
Fiducial Stepping Size: 1.5 mm
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Fiducial Seeding
Slicer displays the tracts seeded from the Fiducial Seed-P.
The tracts correspond to the region of the cingulum located above the corpus callosum.
For better visualization, uncheck the visibility box under Tubes in the Fiber Bundles module (Slide 42).
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Fiducial Seeding
Move the fiducial Seed-P from the left cingulum to the corresponding region in the right cingulum in the coronal slice.
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Fiducial Seeding
Slicer displays a portion of the right cingulum tracts which are seeded from the new position of the fiducial Seed-P
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Part 5:
Saving a DTI Scene
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DTI Scene
Select the module Data
Slicer displays the list of volumes and models generated in this tutorial
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Saving a DTI Scene
Select FileSave from the main menu
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Saving a DTI SceneBrowse to a directory where you would like to save the data. Once you have selected a directory, select all the files that have been created during this tutorial and click on Save Selected
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Saving a DTI Scene
Select FileClose Scene to close the current DTI Scene
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Loading a DTI Scene
Select FileLoad Scene and browse to the location where you saved the scene SlicerScene1.mrml
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Loading a DTI Scene
Select the scene SlicerScene1.mrml and click on Open
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Loading a DTI Scene
Select the module Data
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Loading a DTI Scene
Slicer loads all the elements of the DTI Scene that were previously computed.
![Page 70: NA-MIC National Alliance for Medical Image Computing Diffusion Tensor Imaging tutorial Sonia Pujol, PhD Surgical Planning Laboratory](https://reader033.vdocuments.mx/reader033/viewer/2022051613/5514ed3e550346b0338b5e03/html5/thumbnails/70.jpg)
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Diffusion Tensor Imaging Tutorial, S.Pujol, PhD
Conclusion
This tutorial guided you through some of the Diffusion MR capabilities of the Slicer3 software for studying the brain white matter pathways.
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Acknowledgments
National Alliance for Medical ImageComputingNIH U54EB005149
Neuroimage Analysis Center NIH P41RR013218
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Slicer Community
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