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spectral doppler shift color doppler prf color flow factors/cfd guidelines/pw spectral/ blo base line spectral gain doppler angle doppler parameters doppler shift range equation doppler effect mirror ³Ù³óị power attenuation beam divergence /arrays pulsed us pd prp focusing df spl bandwidth/ resolutions dopp signals dopp parameters dopp equation physics effect / acoustic parameters d.r freq reciever tgc grey scale/ go return time /mechanical index wavelength/ wave parameters wave equation sound waves pt position technique bulk modulus hnteraction intensity reflections shadowing flow inversion umb artery umb vein fetal circulation cimt stenosis occlusion doppler sfift elecric current pzt vibrating crystals absorption reflection scattering vasculature hemodynamics hepatopetal hepatfugal duplex measuring veloctie dopp equa physics/effect/shift/measuring velocties/dopp equa dop types interpretation of color maps dop packets/ color dopp types aliasing reverberation comet dopp principles guidelines velocity measurement color box gate size velocity scale wall filter phasicity transplantation angle of insonation doppler