The TV apparatus includes the 3 leaflets, the annulus, and the subvalvular apparatus (chordae tendineae, papillary muscles), and is closely linked with the right atrium (RA) and the right ventricle (RV) in the socalled “valve-ventricular complex” (6). The TV is the largest among the 4 cardiac valves. In relation to the mitral valve (MV), the TV is located more apically (#10 mm), anteriorly, and to the right (Figure 1). The tricuspid leaflets are thinner than the mitral leaflets and therefore are more difficult to image. The TV annular plane is oriented nearly vertically and is rotated w45 from the sagittal plane (7
he tricuspid leaflets are thinner than the mitral leaflets and therefore are more difficult to image. The TV annular plane is oriented nearly vertically and is rotated w45 from the sagittal plane (7).