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. Author manuscript; available in PMC: 2013 Oct 31.
Published in final edited form as: Ann Thorac Surg. 2008 Sep;86(3):10.1016/j.athoracsur.2008.03.079. doi: 10.1016/j.athoracsur.2008.03.079

Fig. 5.

Fig. 5

Hybrid three-dimensional renderings of all sheep at (A) baseline and (B) after implantation of the (B) saddle ring or the (C) Physio ring. In all cases color contouring is determined by three-dimensional leaflet Gaussian curvature (K), with Kmin equal to −0.5 cm−2 and Kmax equal to 1.5 cm−2 as illustrated in panel A. Negative K indicates saddle-shaped– or hyperbolic–local surface curvature. Positive K indicates elliptic local surface curvature– but may be concave towards the left ventricle or the left atrium. The midanterior annulus (mid-AA), midposterior annulus (mid-PA), anterior commissure (AC), and posterior commissure (PC) have been labeled in each view.