The electrical currents generated in the heart propagate to the outward direction
of the body by means of conductive tissues and these currents yield a potential
distribution on the body surface. This potential distribution is recorded
and analyzed by a tool called electrocardiogram. It is not a problem, if this process
continues normally / however, when it is distorted by some abnormalities,
the results will be fatal. Electrocardiography (ECG) is the technique dealing
with the acquisition and interpretation of the electrical potentials recorded at
the body surface due to the electrical activity of the heart. This can be realized
by using one of the two approaches utilized in ECG namely / forward and inverse
problems. The former one entails the calculation potentials on the body surface
from known electrical activity of the heart and the latter one does the reverse.
In this thesis, we will construct the body surface potentials in a realistic torso
model starting from the epicardial potentials. In order to solve the forward problem,
one needs a geometric model that includes the torso and the heart
surfaces, as well as the intermediate surfaces or the intervening volume, and
some assumptions about the electrical conductivity inside the enclosed volume.
A realistic torso model has a complex geometry and this complexity makes it
impossible to solve the forward problem analytically. In this study, Boundary
Element Method (BEM) will be applied to solve the forward problem numerically.
Furthermore, the effect of torso inhomogeneities such as lungs, muscles
and skin to the body surface potentials will be analyzed numerically.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12607232/index.pdf |
| Date | 01 April 2006 |
| Creators | Kurt, Arda |
| Contributors | Weber, Gerhard Wilhelm |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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