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. 2013 Sep 30;168(2):1220–1228. doi: 10.1016/j.ijcard.2012.11.059

Fig. 9.

Fig. 9

Frame-to-frame and beat-to-beat data for assessing the variability of PISA shape and PISA distance. Top panel: example data from patient 1. Nine systolic frames for each of the 3 beats of colour Doppler PISA data showing the inter and intra beat variability in measuring PISA distance. Bottom panel: variability of measuring PISA distance using the in-vitro model. 30 frames of a 2D colour Doppler video loop showing intraobserver variability in measuring the distance of the flow convergence zone of the round orifice.

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