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Published on: April 13, 2015
Coronary Flow Assessment Using 3-Dimensional Ultrafast Ultrasound Localization Microscopy
Oscar Demeulenaere1, Zulma Sandoval1, Philippe Mateo1
1Physics for Medicine, Ecole Supérieure de Physique Chimie Industrielles de Paris, Institut National de la Santé et de la Recherche Médicale U1273, CNRS UMR 8063, PSL University, Paris, France.
3D coronary ultrasound localization microscopy (CorULM) visualizes the heart's microvasculature (<20 μm resolution) in beating hearts. This advanced imaging technique offers unprecedented insights into coronary artery anatomy and function, paving the way for clinical applications.
Area of Science:
- Cardiovascular Imaging
- Biomedical Engineering
- Microvascular Physiology
Background:
- Direct assessment of coronary microcirculation is limited by current cardiac imaging resolution.
- Existing modalities struggle with the spatial and temporal resolution needed for microvascular studies.
Purpose of the Study:
- To demonstrate 3D coronary ultrasound localization microscopy (CorULM) for whole-heart imaging.
- Achieve sub-20 μm resolution at ultrafast frame rates (>1000 images/s).
Main Methods:
- CorULM performed on isolated beating rat hearts using ultrasound contrast agents and ultrafast electronics.
- Assessed 3D coronary microvascular anatomy, flow velocity, and flow rate under various physiological conditions.
- Validated findings against micro-computed tomography and demonstrated in vivo feasibility.
Main Results:
- CorULM achieved 3D visualization of coronary vasculature down to microvascular structures (<20 μm).
- Demonstrated absolute flow velocity measurements and validated vascular tree scaling laws.
- Observed a 2-fold increase in microvascular coronary flow rate in response to adenosine.
Conclusions:
- CorULM provides novel insights into coronary artery microvasculature in beating hearts.
- This technology has high translational potential for clinical investigation of the coronary microcirculation.
