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- Cardiac Mapping and Heart Geometry
- Excitation Wave Propagation in the Heart
- Electric Potential Fields in the Heart
- Electric Potential and Current Fields in the Thorax (coming soon)
- Movies (QuickTime Format)
Acknowledgement
- Cardiac mapping data are provided by Dr. Taccardi at the CVRTI,
University of Utah
- Simulation of excitation wave in the heart was provided by
Dr. Colli-Franzone at the University of Pavia, Italy
- Some images are generated by Map3d, an interactive scientific
visualization program for bioengineering data, written by Rob MacLeod.
- Some images are generated by SCIRun, a problem solving
environment developed by the
SCI group
at the University of Utah, special thanks to Dave Weinstein and Chris
Moulding of the SCI group.
Ventricular surface. See the following three figures for detailed
description.
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Ventricular surface represented by a triangulated mesh. Nodes of the mesh
formed locations of electrodes mounted on a nylon sock, which was used to
conduct cardiac potential recording. RV = right ventricle;
LV = left ventricle; LAD = left anterior descending coronary artery;
and RCA = right coronary artery.
[back to top]
Multi-electrode needle configuration. In this in situ experiment, electric
potentials were measured from 56 plunge needles inserted in the free wall
of the left ventricle. Each needle contained 12 electrodes separated by 1.6 mm
between each other. [back to top]
Simulated excitation times in a slab of tissue. Stimulation was applied in
the center of the myocardium, which has anisotropic tissue property. An
idealized Purkinje network at the endocardium was activated at around
25 ms after the pacing. This data was provided by Dr. Colli-Franzone.
[back to top]
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Electrical potentials on the epicardial surface during a ventricular stimulation.
Here potentials are drawn as a height field.
The "fault" demonstrates the large potential gradients associated with the
excitation wave in the space. The lower panel shows a sample electrogram
at one of the electrode. The red bar indicates the time instance of the
potential map.
[back to top]
Comparison of linear and wave-equation based (WEB) interpolations of
electric potentials on the epicardial surface.
Upper row contains isopotential maps all
derived from original recordings from
$16\times16$ electrodes with 1.5 mm spacing (leftmost panel),
interpolated results from a $4\times4$ sub-sampling grid (marked
by large dots) using the WEB interpolation (center
panel), and using standard linear interpolation (rightmost panel).
The time instant selected was 13~ms after pacing, as marked by
vertical line in the single time signal shown in the bottom left
hand panel, which was located at the site marked by the red circle
in the left hand map.
[back to top]
Quan
Ni
Last Updated: Quan Ni Wed Aug 18 14:57:23 MDT 1999