Fig. 1

LA volume assessment with TTE and CE-MRA. a Example of a TTE apical 4-chamber view with delineation of the LA wall and exclusion of the LAA, PVs and area between the mitral valve annulus and mitral valve leaflets. Landmarks indicate the mitral valve level and LA length. b Example of a sagittal segment of CE-MRA with delineation of the LA wall. The atrioventricular groove and mitral valve were used as landmarks to separate the LA from the left ventricle. c 3-D reconstruction of the LA cavity, constructed from the CE-MRA segments