RT-matcher of data with different heart beats rates

The field distribution and the time evolution of the heart beat change with heart frequency. The RR interval is subject to change in patients that undergo stress exercise testing. To compare field distribution before and after stress the signals need to be reproduced on the same time scale, at least in the segment of interest. In order to achieve this aim, we apply a “matcher” operator in the time interval between R-end and T-max, obtaining rescaled signals that can be directly compared. In this study the RT-matcher was applied to magnetocardiographic (MCG) data, but it could be used in electrocardiographic (ECG) data, as well. The RT-matcher has shown to be a useful pre-processing step for the comparison of data with different ST segment lengths.