Fig 2.

Leaflet segmentation technique. (A) Template of transverse cross-sections every 1 mm along the intercommissural axis. (B) One of the two-dimensional cross-sections represented by the white dashed line in (A); the atrial surface of the mitral valve leaflets and the coaptation zone are interactively marked (green curves). The most atrial coaptation point is marked with the white dot, and the most ventricular coaptation point is marked with an X. (C) Schematic demonstrating how the atrial and ventricular coaptation points are then projected onto a viewing plane orthogonal to the least squares annular plane passing through the commissures to construct a two-dimensional representation of the coaptation zone. The white and red dashed lines are both within least squares annular plane in all three panels. (AC = anterior commissure; AML = anterior mitral leaflet; AoV = aortic valve; Coapt = coaptation; LA = left atrium; LV = left ventricle; LVOT = left ventricular outflow tract; PC = posterior commissure; PML = posterior mitral leaflet.)