FIGURE 1. Define the Annular Plane.
Mark the exact annular plane. This is an orthogonal side view (maximum intensity projection) confirming that the selected annular plane is accurate for this Magna-Ease valve. The dots on the annular nadirs (green, right coronary cusp [RC]; yellow, noncoronary cusp [NC]) overlap, and the stent posts overlap in this so-called 2:1 orientation. Left coronary artery origin is seen at 2 o’clock. Multiplanar reconstruction shows the center of rotation (3-pronged star). (Inset) example of annular plane selected for a Mitroflow bioprosthetic, which typically assumes a sigmoidal configuration after implantation; the plane should abut at the lowest 3 points. LC = left coronary cusp.