Biplane echocardiographic imaging identifies the sagittal imaging plane that bisects the largest dimension of the aortic annulus

Biplane transthoracic imaging shows the sagittal (A) and corresponding transverse (B) plane. The large, vertical arrows define the imaging plane for the orthogonal view. The smaller, angled arrow shows the appropriate annular measurement in the on-axis sagittal plane.
Biplane transesophageal imaging shows the sagittal (C) and corresponding transverse (D) plane. Smaller, angled arrow in panel C shows the appropriate annular measurement in the on-axis sagittal plane.