As ultrasound technology has developed into a practical method for imaging cardiac structures, the incorporation of another technique using ultrasound, for the measurement of blood flow and direction, has followed naturally. Doppler echocardiography was first reported by Satumora  and is widely available as an adjunctive diagnostic procedure with echocardiography. With advancing computer technology, Doppler echocardiography is providing more and more clinical information, all in a noninvasive procedure.
KeywordsBlood Flow Velocity Ventricular Septal Defect Pulsatile Flow Doppler Echocardiography Pulse Repetition Frequency
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