The last 10 years have seen an explosion of uses for ultrasound in the identification and management of congenital heart disease. This growth in echocardiography accompanied revolutionary improvements in neonatal heart surgery. Today, with the popularization of the subcostal window as the starting window of choice in the newborn and the refinement of Doppler colour flow mapping instrumentation, cardiologists can now obtain both anatomy and physiology noninvasively. The purpose of this book is to outline how cardiac ultrasound can be utilized to diagnose even the most complex congenital malformation preoperatively and how anatomy and physiology can be assessed after surgical reconstruction. The strengths of magnetic resonance imaging, a newer modality with special advantages in the characterization of vascular anatomy and ventricular function, are also illustrated