Figure 3.

Measurements of the fibrous and muscular components of AV annulus based on MS-CT data. (A) Definition of the fibrous and myocardial components of AV annulus; (B) rotational measurement around centre-axis and identification of 3-dimensional AV annulus perimeter. AV, aortic valve; AML, anterior mitral leaflet; IVS, muscular interventricular septum; LCA, left coronary artery orifice; LFT, left fibrous trigone; L/N, left/non coronary commissure; L/R, left/right coronary commissure; MS, membranous interventricular septum; PA, pulmonary artery; RCA, right coronary artery orifice; RFT, right fibrous trigone; R/N, right/non-coronary commissure; RVOT, right ventricular outflow tract.