DISTURBANCES SUPPRESSION PROCESS DURING POSITION AND/OR DIRECTION FINDING OF AN ELECTROPHYSIOLOGICAL ACTIVITY

摘要

A process is disclosed for suppressing disturbances during the position and/or direction finding of an electrophysiological activity (8) in a living being (4). The field distribution (10) generated by the electrophysiological activity is simultaneously measured at a plurality (n) of measurement sites by a multiple-channel measurement device (12). The measurement values (Mi(t)) measured by the individual channels contain, as multi-dimensional measurement signal vectors (M^¨B7(t)), a useful signal component which corresponds to the field parameters of the electrophysiological activity at the measurement sites, and a disturbing signal component whose characteristic field pattern is known. The characteristic field pattern may be represented by the direction of a multi-dimensional disturbing signal vector, without taking into account the absolute amplitude. When finding the position of the electrophysiological activity (8), only the component (Q^¨B7'(t)) orthogonal to the disturbing field vector of a multi-dimensional source field vector (Q^¨B7(t)) predetermined by a back-up source is compared with the component (M^¨B7'(t)) of the measurement signal vector (M(t)) orthogonal to the disturbing field vector.