3d visualization of freesurfer data · -1-pujol s et al. national alliance for medical image...
TRANSCRIPT
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Pujol S et al.
National Alliance for Medical Image Computing
3D Visualization of FreeSurfer
DataSonia Pujol, Ph.D.Silas Mann, B.Sc.
Randy Gollub, MD., Ph.D.
Surgical Planning Laboratory
Athinoula A. Martinos Center
Harvard University
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Pujol S et al.
National Alliance for Medical Image Computing
National Alliance for Medical Image Computing
NIH U54EB005149
Neuroimage Analysis Center
NIH P41RR013218
Morphometry Biomedical Informatics Research Network
NIH U24RRO21382
Surgical Planning Laboratory (BWH)
Thanks to Nicole Aucoin
Center for Functional Neuroimaging Technology
NIH P41RR14075
Acknowledgements
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Guide you step-by-step through
the process of loading and viewingFreeSurfer segmentations,
surface reconstructions, and
parcellation results within Slicer3.
Learning Objective
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Prerequisites
This tutorial assumes that you have completed the course
Slicer3Visualization Tutorial.
Tutorials for Slicer3.4 are available on the Slicer101 page:
http://www.slicer.org/slicerWiki/index.php/Slicer3.4:Training#Software_tutorials
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Prerequisites
This tutorial assumes a working
knowledge of how to use FreeSurferto generate segmentation and
surface files.
Tutorials for FreeSurfer are available
at the following location:
http://surfer.nmr.mgh.harvard.edu/fswiki/Tutorials/
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Materials
•This tutorial requires the installation of the Slicer3.4
software and the tutorial dataset.
•Download and install the Slicer3.4 software from the
Slicer web site
http://www.slicer.org/pages/Special:SlicerDownloads
Disclaimer: It is the responsibility of the user of Slicer to comply with both the terms of the license and with the applicable laws, regulations, and rules.
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Materials
This tutorial makes use of the same T1 weighted image dataset (bert) that is
used for the FreeSurfer tutorial available at the following location:
http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial
If you already have the FreeSurfer subject ‘bert’ on your computer, then just
download the file ‘slicerGenericScene.mrml’
http://www.na-mic.org/Wiki/index.php/Image:SlicerGenericScene.mrml
If you don’t have the FreeSurfer tutorial dataset known as ‘bert’ on your
computer, then download the archive below:
http://www.na-mic.org/Wiki/index.php/Image:FreeSurferData.tar.gz
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• Brain volumes . . . . . . . . . . . . . . . . . . . . . . . . .
• ASEG volumes . . . . . . . . . . . . . . . . . . . . . . . . . . .
• Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
• Parcellation Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . .
• All of the above, via a scene file. . . . . . . . . . . . . . .
From FreeSurfer, Slicer3 can load:
Overview
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Overview
•Part 1: Loading and VisualizingFreeSurfer Volumes
•Part 2: Building 3D Models
•Part 3: Loading FreeSurfer Surfaces
and Visualizing Parcellation Maps
•Part 4:Automatic Data Loading via a Generic Scene File
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Part 1: Loading and Visualizing FreeSurfer
Volumes
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Loading a Brain File
Intensity corrected
T1 volume
Skull Stripping and Noise Filtering
Watershed Algorithm
brain.mgz
FreeSurfer pipeline
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Loading a Brain File
Select Volumes from
the Module menu
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Loading a Brain File
Click on Select Volume File
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Loading a Brain File
Browse to find the
dataset brain.mgzlocated in the
directory
/subjects/bert/mri/
and click on Open
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Loading a Brain File
Choose Image Origin: Centeredand click Apply
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Loading a Brain File
The volume brain.mgz
appears in the Slice Viewer
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Loading a Brain File
Click on the linksicon to link the three anatomical
slices.
Click on the Slice
Visibility icon to display the slices in
the 3D Viewer
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Loading a Brain File
The three anatomical
slices appear in the 3D Viewer
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Loading an ASEG File
Intensity corrected
T1 volume
Subcortical processing
aseg.mgz
FreeSurfer pipeline
Segmentation
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Loading an ASEG File
Click on Select Volume File, and browse to find
the dataset aseg.mgz located in the directory
/subjects/bert/mri/ and click on Open
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Loading an ASEG File
Select Label Map and
click on Apply
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Loading an ASEG File
The volume aseg.mgz
appears in the Viewer
The labels are
superimposed on the
gray brain images
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Overlay Brain & Segmentation
Mouse over the labels
in the Axial view
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Overlay Brain & SegmentationOverlay Brain & Segmentation
The names of the
labels appear in the
window
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Overlay Brain & Segmentation
Find the labels corresponding to the
Left Thalamus Proper, the Left
Caudate, and the Left Putamen in
the three anatomical views
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Overlay Brain & Segmentation
Left Thalamus Proper = #10
Left Putamen = #12
Left Caudate = #11
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Part 2: Building
3D Models
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• Building a Single Model
• Building Multiple Models
Building 3D Models
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Building a Single Model
Select the module
Model Maker from the
category Surface
Models
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Building a Single Model
Choose Input Volume:aseg.mgz
Select Models: Create New
ModelHierarchy
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Building a Single Model
Enter right-hippocampus as Model Name and uncheck the
box for Generate All Models
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In the Model Maker Parameters tab, type
in label #53, which
corresponds to the
label for the Right Hippocampus
Building a Single Model
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Turn off Slice visibility
and Click Apply
Building a Single Model
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Building a Single Model
The 3-dimensional model of the Right
Hippocampus appears
in the 3D Viewer
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• Building a Single Model
• Building Multiple Models
Building 3D Models
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Delete the Model Name.
Delete label #53, and set the Start Label to label
#10, which corresponds
to the Left Thalamus
Proper
Set the End Label to label #13, which
corresponds to the LeftPallidum
Check Joint Smoothing
Building Multiple Models
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Click Apply
Building Multiple Models
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Building Multiple Models
The 3-dimensional models of
the Left Thalamus Proper(label #10), Left Caudate (label
#11), Left Putamen (label #12),
and Left Pallidum (label #13)
appear in the 3D Viewer
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Part 3: LoadingFreeSurfer Surfaces and VisualizingParcellation Maps
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Building Multiple Models
Select the module
Models from the
Module menu
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Loading Surfaces
Click on Add 3D model or a
model directory, and click Select Model.
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Loading Surfaces
Browse to find the surface
lh.white located in the directory
/subjects/bert/surf/
Click on Open
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Loading Surfaces
The surface of the White Matter of the
Left Hemisphere
appears in the 3D Viewer
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Click on Add scalar overlay
Visualizing Parcellation Maps
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Click on Select model for overlay and selectlh.white. Click Select
a scalar overlay.
Visualizing Parcellation Maps
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Visualizing Parcellation Maps
Browse to find the Parcellation Map
lh.aparc.annot located in the directory
/subjects/bert/label/
and click on Open
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Visualizing Parcellation Maps
The Parcellation Map
is overlaid on the
White Matter surface
in the 3D Viewer
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Part 4: Automatic Data Loading via a Generic Scene File
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Loading a Generic Scene File
Click on Close Scene in
the File menu to close
the current sceneClick OK to confirm
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Loading a Generic Scene File
• The generic scene file works by looking in the subject
directory created by FreeSurfer, and loading all available volumes and models based on known
subdirectory names and filenames.
• The file slicerGenericScene.mrml will work properly if
the subdirectory names and filenames have not been changed by the user.
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Loading a Generic Scene File
Copy the file slicerGenericScene.mrml into the
directory /subjects/ of our tutorial dataset.
/subjects/
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Loading a Generic Scene File
Copy the file slicerGenericScene.mrml located in the
directory /subjects/, into the directory /subjects/bert/ of our sample subject.
/subjects/bert/
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Loading a Generic Scene File
Rename the file ‘slicerGenericScene.mrml’ located in
the directory /subjects/bert/ ‘slicerBertScene.mrml’
/subjects/bert/
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Loading a Generic Scene File
Click on Load Scene in the Filemenu, and select the scene
slicerBertScene.mrml located in
the directory /subjects/bert/
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Loading a Generic Scene File
The scene appears with a
list of files which have been automatically loaded
from the subject directory
bert.
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Loading a Generic Scene File
Select the mode 3D only layout
from the Viewer menu
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Loading a Generic Scene File
Select the module
Models, and expand the tab Hierarchy &
Display to display the
list of models that
were loaded
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Select the surface lh_pial,
and turn on the visibility of the model
Loading a Generic Scene File
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Loading a Generic Scene File
Slicer displays the left
hemisphere pial surface in the 3D viewer
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The generic scene includes
three snapshots that provide a variety of scene setups:
-Left and Right Annotations
-Left and Right Pial curve
-Left and right white sulc
Loading a Generic Scene File
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Click on the restore snapshots
icon, select the snapshot Left and right white sulc, and
click on restore
Loading a Generic Scene File
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Loading a Generic Scene File
The snapshot displays the
left and right sulci using theGreenRed colorscheme.
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• Brain volumes . . . . . . . . . . . . . . . . . . . . . . . . .
• ASEG volumes . . . . . . . . . . . . . . . . . . . . . . . . . . .
• Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
• Parcellation Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . .
• All of the above, via a scene file. . . . . . . . . . . . . . .
From FreeSurfer, Slicer3 can load:
Summary
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• 3D visualization of brain segmented surfaces and parcellation maps
• Intuitive graphical user interface to interact withFreeSurfer data
• Multi platforms open-source environment
Conclusion