A comparison of electrocardiographic imaging based on two source types.

Area of Science:

• Biomedical Engineering
• Cardiovascular Imaging
• Computational Electrophysiology

Background:

• Accurate imaging of cardiac electrical activity is crucial for diagnosing and managing heart conditions.
• Existing methods for electrocardiographic imaging rely on different source models to interpret body surface potentials.

Purpose of the Study:

• To compare the performance of two distinct source models: Equivalent Double Layer (EDL) and Equivalent Potential Distribution (EPD).
• To evaluate their effectiveness in imaging myocardial activation and repolarization timing using body surface potentials.

Main Methods:

• Developed an MRI-based electric volume conductor model of the thorax.
• Estimated endocardial potential fields and electrograms (ELGs) using both EDL and EPD source models.
• Used transmembrane potential (TMP) templates for constraining the EDL model and compared timing markers from ELGs.

Main Results:

• Both EDL and EPD models produced qualitatively similar endocardial potential fields and ELGs.
• The EDL model showed higher correlation with TMP templates for depolarization timing compared to the EPD model.
• Repolarization timing estimation showed insufficient similarity for the EPD-based approach.

Conclusions:

• The Equivalent Double Layer (EDL) source model demonstrates superior performance for accurately estimating cardiac depolarization timing.
• The Equivalent Potential Distribution (EPD) model requires further investigation for repolarization timing accuracy.
• Both EDL and EPD source models warrant further study in the advancement of electrocardiographic imaging.