Download - NAMIC Activities at UNC
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National Alliance for Medical Image Computing http://na-mic.org
Slide 1
NAMIC Activities at UNC• Image Analysis
– DTI QC via Monte Carlo Simulation– Longitudinal atlases with intensity changes– DTI Registration with pathology– Fiber tract analysis framework
• Shape Analysis– Longitudinal shape correspondence– Groupwise cortical correspondence– SPHARM-Particle shape analysis framework
TBI
HD
MethodsEngineering
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National Alliance for Medical Image Computing http://na-mic.org
Slide 2
Cortical Correspondence
• Goal: Flexible, group-wise cortex correspondence– Cortical thickness analysis in HD DBP– Allow for point and sulcal landmarks, longitudinal info
• Existing NA-MIC particle based correspondence• No guarantee on surface mesh topology
– Spherical parametrization• No explicit registration/deformation
– Spherical harmonics encoding – Local angular deformation– Optimal pole choice
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National Alliance for Medical Image Computing http://na-mic.org
Slide 3
Group-wise Correspondence
• Entropy on sulcal depth & landmarks– Exponential spherical mapping
• Color based correspondence QC
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National Alliance for Medical Image Computing http://na-mic.org
Slide 4
Cortical Correspondence
- Manual (ground truth) sulci mapped into average atlas space
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National Alliance for Medical Image Computing http://na-mic.org
Slide 5
Brain Shape Regression• Utah NA-MIC shape
regression applied to pediatric brain shape
• Craniosynostosis pathologic brain development
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National Alliance for Medical Image Computing http://na-mic.org
Slide 6
DTI QC – Error distribution– DTI/DWI noisy, artifact rich => QC needed– Rejection of bad gradients
• How much rejection is still okay? • Simple threshold on numbers of rejected DWI?
– Goal: Estimate error distribution via Monte Carlo– Reject dataset based on error requirements
• Error in FA or principal direction
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National Alliance for Medical Image Computing http://na-mic.org
Slide 7
DTI Error Distribution
Thresholds• 1% FA error for apps like HD DBP• 10° error for tractography in surgical apps
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National Alliance for Medical Image Computing http://na-mic.org
Slide 8
UNC-Utah DTI Framework• NA-MIC Algorithms from UNC, MIT, Utah,
Iowa => HD and TBI DBP• Comprehensive tools
– DWI/DTI QC– DWI/DTI-Atlas building– Tractography– Fiber metrics– Profile analysis
• Slicer compatible• SPIE/online tutorial