The noninvasive evaluation of hemodynamics in congenital heart disease is an application for which Doppler ultrasound is ideally suited. The pediatric cardiac sonographer has used 2D and TM imaging for several years to study the structural abnormalities associated with various lesions. Pulsed Doppler, continuous wave Doppler, and more recently, color flow mapping techniques have been used to study the pathophysiology, and to make quantitative measurements...