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. 2012 Jul 13;303(6):H712–H720. doi: 10.1152/ajpheart.00269.2012

Fig. 4.

Fig. 4.

Validation of markerless motion tracking algorithm for n = 3 hearts for SR, 200 ms cycle length (CL) ventricular pacing, and 143 ms ventricular pacing. Left: comparison of mean error for markerless surface matching (white) to traditional texture correlation (black). Right: comparison of mean error for markerless surface matching during SR, 200 ms CL ventricular pacing, and 143 ms ventricular pacing. Error bars represent standard deviation of the mean. Significance between groups is calculated with the Mann-Whitney U-test. P < 0.05 considered significant; NS, not significant.