Variable sample volume dimension in pulse Doppler echocardiography.
D001783:Blood Flow Velocity; D002306:Cardiac Volume; D003326:Coronary Circulation; D003331:Coronary Vessels / Q000502:physiology; D004301:Doppler Effect; D004452:Echocardiography / Q000379:methods*; D006349:Heart Valve Diseases / Q000503:physiopathology; D006801:Humans