Structured light imaging of epicardial mechanics

Area of Science:

• Cardiovascular physiology
• Biomedical imaging
• Mechanical engineering

Background:

• Accurate measurement of cardiac mechanical strain and motion is crucial for understanding heart function.
• Existing methods face limitations in resolution, speed, and applicability to dynamic cardiac processes.
• In vitro and in vivo studies require advanced tools for detailed epicardial analysis.

Purpose of the Study:

• To introduce and validate a novel structured-light imaging system for high-resolution epicardial shape and motion measurement.
• To demonstrate the system's capability in capturing the mechanics of a beating heart.
• To establish a foundation for advanced cardiac function analysis, including strain mapping and motion artifact removal.

Main Methods:

• Development of a structured-light imaging system with a frame rate of 333 frames per second and a resolution of 768 × 768 pixels.
• Application of the system to an in vitro beating rabbit heart model.
• Acquisition of high-resolution epicardial shape data during cardiac cycles.

Main Results:

• The system successfully measured epicardial shape and motion at high speed and resolution.
• Proof-of-concept data demonstrated the feasibility of quantifying epicardial mechanics in vitro.
• The developed method provides a basis for high-resolution epicardial strain mapping.

Conclusions:

• The novel structured-light imaging system offers accurate and high-resolution measurement of epicardial mechanics.
• This technology facilitates virtual immobilization of the heart, enabling artifact removal in recordings.
• Future applications include in vivo mapping of transmembrane potential and calcium transients in beating hearts.