Related Experiment Video
Updated: Jul 16, 2026
09:17
High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
Published on: July 29, 2011
Detection of intramyocardial scroll waves using absorptive transillumination imaging
Olivier Bernus1, Karthik S Mukund, Arkady M Pertsov
1The State University of New York, Upstate Medical University, Department of Pharmacology, 750 East Adams Street, Syracuse, New York 13210, USA.
Journal of Biomedical Optics
|March 9, 2007
Summary
This study demonstrates that dynamic transillumination imaging can visualize intramural scroll wave filaments within the entire ventricular wall. This optical imaging technique offers a new method for studying cardiac electrical waves and understanding ventricular fibrillation.
Area of Science:
- Biophysics
- Cardiac Electrophysiology
- Optical Imaging
Background:
- Spiral and scroll waves in cardiac tissue can cause life-threatening arrhythmias like ventricular fibrillation.
- Previous optical imaging methods were limited to observing surface manifestations of scroll waves, hindering filament visualization.
- Understanding the intramural filament structure is crucial for comprehending scroll wave dynamics and pathology.
Purpose of the Study:
- To assess the feasibility of visualizing intramural scroll wave filaments using dynamic transillumination imaging.
- To evaluate the effectiveness of near-IR voltage-sensitive absorptive dyes for detecting these filaments.
- To determine if this technique can image through the full thickness of the ventricular wall.
Main Methods:
- Computer modeling of cardiac electrical excitation using the LRd ionic model.
- Coupling the ionic model with a photon transport model for cardiac tissue.
- Simulating dynamic absorptive transillumination signals from intramural scroll waves.
Main Results:
- Dynamic absorptive transillumination successfully detected intramural scroll waves throughout the entire ventricular wall thickness (approx. 10 mm).
- Image processing techniques including amplitude maps, time-space plots, and dominant frequency maps reliably identified filaments.
- Detection remained effective despite variations in myocardial wall thickness and the presence of noise.
Conclusions:
- Dynamic absorptive transillumination is a viable method for visualizing intramural scroll wave filaments in cardiac tissue.
- This technique provides a means to study the three-dimensional structure of cardiac electrical waves, crucial for understanding arrhythmias.
- The method shows robustness against anatomical variations and signal noise, suggesting clinical applicability.
