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DENSE: displacement encoding with stimulated echoes in cardiac functional MRI
A H Aletras1, S Ding, R S Balaban
1Laboratory of Cardiac Energetics, NHLBI, Bethesda, Maryland, 20892-1061, USA.
Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|March 4, 1999
Summary
Displacement Encoding with Stimulated Echoes (DENSE) enables high-resolution myocardial displacement mapping. This technique accurately measures cardiac strain, improving visualization of the heart
Area of Science:
- Cardiovascular Imaging
- Biomedical Engineering
- Medical Physics
Background:
- Accurate myocardial displacement mapping is crucial for understanding cardiac function.
- Existing methods may have limitations in resolution or artifact reduction.
- High-resolution imaging is essential for detailed analysis of cardiac mechanics.
Purpose of the Study:
- To introduce and validate Displacement Encoding with Stimulated Echoes (DENSE) for myocardial displacement mapping.
- To demonstrate the capability of DENSE for generating high-resolution 2D displacement vector maps.
- To assess the accuracy of DENSE in measuring cardiac strain during systole.
Main Methods:
- Utilized DENSE MRI sequence for myocardial displacement encoding.
- Generated 2D displacement vector maps with high in-plane resolution (0.94 x 1.9 mm).
- Employed specific displacement encoding (2.3 mm/pi) and analyzed systolic action in canines.
Main Results:
- Achieved high-resolution myocardial displacement mapping.
- Measured a radial strain of 0.208 across the left ventricular free wall during systole.
- DENSE magnitude images provided black-blood contrast for enhanced myocardial definition and reduced artifacts.
Conclusions:
- DENSE is a viable technique for high-resolution myocardial displacement and strain mapping.
- The method offers improved myocardial definition and reduced motion artifacts compared to other techniques.
- DENSE facilitates detailed assessment of cardiac mechanics during systolic action.