Several non-invasive methods are available for three-dimensional imaging of human subjects. However, imaging techniques such as computer tomography or magnetic resonance imaging depict passive properties of the tissue. Bioelectric and biomagnetic measurements trace the bioelectric source current distributions. The magnetocardiographic measurements have turned out to be effective in three-dimensional localization of current sources restricted in size. In particular localization of arrhythmogenic sources has been tested by several groups with promising results. The multichannel instrumentation now available allow a completely noninvasive study of the subjects in a short time.
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