title: Pulsed Doppler echocardiographic audio spectrum analysis: time interval histogram versus multifilter spectrogram and fast Fourier transform.
mesh_terms: D001783:Blood Flow Velocity; D004301:Doppler Effect; D004452:Echocardiography / Q000379:methods*; D005583:Fourier Analysis; D006321:Heart / Q000502:physiology*; D006349:Heart Valve Diseases / Q000503:physiopathology; D006801:Humans; D013057:Spectrum Analysis; D013997:Time Factors