Evaluation and assessment of clique arrangements for the estimation of omnipolar electrograms in high density electrode arrays: an experimental animal model study

Fig. 1. A Arrangement of the multielectrode array. B Picture of the self-manufactured multielectrode. C Experimental setting

Fig. 2. Configurations of a clique of electrodes , , , , and

Fig. 3. Graphical description of some of the metrics assessed: A Normalised loop areas (NLA); B Omnipolar ratio (ORR); C Pulse width (PW)

Fig. 4. Examples of the bipolar loops (in black) and the corresponding propagation direction (in red) generated by triangular and cross-oriented configurations on the same clique along interelectrode distances 1–4 mm

Fig. 5. Examples of the omnipoles on the same clique reconstructed by triangular and cross-oriented configurations, with horizontal component of oEGM in black and vertical component in red, along interelectrode distances 1–4 mm

Fig. 6. Comparison of the triangular and cross-oriented configurations for the different parameters under study. A Normalised loop areas (NLA); B Omnipolar ratios (ORR); C Morphology distortion of omnipoles (MD); D Pulse Width (PW)

Fig. 7. Morphology analysis of oEGMs. Top row: reference oEGM \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$o_{\textrm{ref}}(t)$$\end{document}oref(t) computed from the gradient of the mean uEGM; Central row: estimated oEGM \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\hat{o}}(t)$$\end{document}o^(t) for triangular clique ; Bottom row: estimated oEGM for clique . The voltage amplitude has been normalised