DOPPLER ULTRASONOGRAPHY
\dˈɒpləɹ ˌʊltɹɐsənˈɒɡɹəfi], \dˈɒpləɹ ˌʊltɹɐsənˈɒɡɹəfi], \d_ˈɒ_p_l_ə_ɹ ˌʊ_l_t_ɹ_ɐ_s_ə_n_ˈɒ_ɡ_ɹ_ə_f_i]\
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Ultrasonography applying the Doppler effect, with frequency-shifted ultrasound reflections produced by moving targets (usually red blood cells) in the bloodstream along the ultrasound axis in direct proportion to the velocity of movement of the targets, to determine both direction and velocity of blood flow. (Stedman, 25th ed)
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