# department of computer science, university of houston *cardiovascular mri laboratory, the...
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#Department of Computer Science, University of Houston*Cardiovascular MRI Laboratory, The Methodist DeBakey Heart & Vascular Center
Free-Breathing Cardiac MRI
Ilyas Uyanik, Peggy Lindner, Dipan Shah (M.D.)*, Nicolaos Tsekos#, Karen Chin*
Ioannis Pavlidis#
2/10
Motivation
• Cardiac MRI (Magnetic Resonance Imaging) – Evaluate the anatomy and function of the heart– Diagnose pathological cases (e.g., low ejection fraction
and fibrillation)
• Existing methods- Breath-hold acquisition (does not allow for long
duration acquisition)- Free-breathing acquisition with ECG and/or
Peripheral Gating
• Goals– Free-breathing acquisition using MRI signal based
Gating– Record long duration cardiac MRI without additional
sensors
• Motivation• Methods• Results• Conclusion
3/10
Methods Overview• Motivation• Methods• Results• Conclusion
Phase 2
MRIImage
ROI
Level Set
Left Ventricle
1D Signal
Wavelet
WaveletEnergy
Waveforms Extraction
Phase 1
Indexing
Reconstruction
Phase 3
- Methods Overview- Indexing- Visualization
4/10
Indexing• Motivation• Methods• Results• Conclusion
- Methods Overview- Indexing- Visualization
Indexed MRI
Thresholdon breathing
MRI
5/10
Visualization• Motivation• Methods• Results• Conclusion
- Methods Overview- Indexing- Visualization
6/10
Validation
• Ground Truth obtained by manually marking points on the left ventricle outer boundary
• Motivation• Methods• Results• Conclusion
- Ground Truth Comparison–Extracted Signals
7/10
Surface Area• Motivation• Methods• Results• Conclusion
- Ground Truth Comparison–Extracted Signals
8/10
Cardiac Cycle• Motivation• Methods• Results• Conclusion
- Ground Truth Comparison–Extracted Signals
9/10
Breathing Cycle • Motivation• Methods• Results• Conclusion
- Ground Truth Comparison–Extracted Signals
10/10
- Free-breathing acquisition using MRI signal itself - Segmentation method is promising- Breathing and pulse signals extracted for indexing
• Future work- 3D Imaging modality - Experiments on normal/ abnormalpathological cases from volume over time
• Motivation• Methods• Results• Conclusion
Conclusion