​Advances in technology and human skill have made possible percutaneous catheter-based procedures for a wide spectrum of structural heart disease. A growing number of structural heart diseases that over the past two decades would have required open heart surgery can be safely treated using percutaneous catheter-based procedures.Traditionally, guidance of catheter-based procedures is done using fluoroscopy and two-dimensional transesophageal echocardiography (2D TEE). The recent introduction in the clinical practice of RT 3D TEE has overcome most of limitations of 2D TEE. The purpose of...