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Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations
Published on: January 8, 2013
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Free-breathing 3D cardiac extracellular volume (ECV) mapping using a linear tangent space alignment (LTSA) model
Arxiv
|September 10, 2024
Summary
This study presents a new free-breathing 3D cardiac extracellular volume (ECV) mapping method at 3T. The technique allows for whole-heart ECV assessment in a feasible time, showing comparable results to existing methods.
Area of Science:
- Cardiovascular Magnetic Resonance Imaging
- Medical Imaging Techniques
- Quantitative MRI
Background:
- Accurate extracellular volume (ECV) mapping is crucial for assessing myocardial tissue characteristics.
- Existing methods for 3D ECV mapping often require breath-holding, limiting patient comfort and applicability.
- Developing free-breathing techniques is essential for whole-heart coverage and improved clinical workflow.
Purpose of the Study:
- To develop and validate a novel free-breathing 3D cardiac extracellular volume (ECV) mapping method at 3 Tesla (3T).
- To enable comprehensive, whole-heart ECV assessment without the need for breath-holding.
- To evaluate the feasibility and accuracy of the proposed method in healthy volunteers.
Main Methods:
- A free-breathing, ECG-gated 3D inversion-recovery sequence with spoiled gradient echo readout was employed for T1 mapping.
- Linear Tangent Space Alignment (LTSA) model-based reconstruction was used for high-frame-rate dynamic image acquisition from sparsely sampled (k,t)-space data.
- Joint T1 and B1 estimation, along with a time-varying T1 model for post-contrast imaging, were implemented for accurate ECV calculation.
Main Results:
- The developed method successfully generated 3D ECV maps of the whole heart at 3T with a spatial resolution of 1.9x1.9x4.5 mm³.
- Imaging was performed within a practical scan time of approximately 10-11 minutes before and after contrast administration.
- Qualitative and quantitative comparisons showed good agreement between the proposed 3D ECV maps and the established 2D MOLLI technique.
Conclusions:
- The proposed free-breathing 3D cardiac ECV mapping method is feasible and provides whole-heart coverage at 3T within a clinically relevant timeframe.
- The method demonstrates comparable ECV values to existing techniques, suggesting its potential for clinical application.
- This advancement offers a more accessible and comprehensive approach to cardiac tissue characterization using ECV mapping.
