Figure 4.

Marker array on the aortic surface of the leaflets as viewed from camera (a) 2 and (b) 1. The superimposed black-shaded areas illustrate where strains were computed (a) in the leaflet coaptation region (zones 1–6) and (b) in the leaflet commissures. The central axis of the valve is denoted by the dashed line. (c) Three-dimensional reconstruction of the marker array at the reference configuration from raw images (a) and (b) with associated elements and nodal connectivity used for major principal strain computation. (Online version in colour.)