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Arrangement of sonocrystal on the ovine anterior leaflet. Following the ring annuloplasty, crystals 1–5 were removed. The arrows show the circumferential (Circ.) and radial (Rad.) directions used in strain calculation at the midsection of the anterior leaflet. The midsection region surrounded by crystals 6–9 was used in bi-linear finite elements surface fitting and the region surrounded by crystals 1–7 and silhouetted was used in bi-quadratic finite element surface fitting.
