Figure 4
From: A direct comparison of natural and acoustic-radiation-force-induced cardiac mechanical waves
Overview of the propagation speeds obtained for the active SWE sequence. Individual sequences were aligned in time for each pig individually (a–d respectively), with the onset of diastole set to t = 0 s. The dots depict the wave propagation speed values obtained with individual M-splines, while the solid lines show the median wave speeds of all M-splines within one sequence (if nv ≥ 5). The shaded colored areas depict the inter-quartile range of all wave speed values for all active sequences per animal. The grey shaded vertical bands depict the temporal ranges in which valve closure was observed. The total number of successful active SWE sequences is indicated by the ns-value at the top of the figures. Representative ECG signals are also shown in this figure, but were not recorded simultaneously with the SWE acquisitions. For pig 1, no ECG data was saved due to mal-functioning of the ECG device. Note additionally that ECG triggering of the SWE acquisitions did not properly work for pig 2.
