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Waveform fidelity

FI Francis Roosevelt Gilliam, III
RC Robert Ciesielski
KS Karlen Shahinyan
PS Pratistha Shakya
JC John Cunsolo
JP Jal Mahendra Panchal
BK Bartlomiej Król-Józaga
MK Monika Król
OK Olivia Kierul
CB Charles Bridges
CS Christine Shen
CW Carly E. Waldman
MR Martin Ring
TS Tomasz Szepieniec
AB Anna Barnacka
SB Sanjeev P. Bhavnani
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IH waveform fidelity is quantified as the median value of cross-correlation function maxima for successive waveform pairs. For each successive pair of waveforms, the cross-correlation function is calculated as the time-dependent Pearson correlation coefficient (rxy) for a range of lag times, τ between 0 and 500 ms:

where x and y are successive waveforms discretized into n 1-ms samples, and their mean values are given by mx and my, respectively. Waveform fidelity is then defined as F = median(max(rxy)). For the waveform comparison between the left and right channels, the x and y variables in the formula in Equation (3) are replaced by the left- and right-channel data of the same heartbeat.

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