Doppler Echocardiography QUESTIONS WITH COMPLETE SOLUTIONS

what is required in order for blood flow to occur? correct answer: a pressure difference the two types of spectral Doppler correct answer: pulsed-wave (PW) continuous wave (CW) which valve is slightly more apical, the MV or the TV? correct answer: TV how do you optimize color gain? correct answer: increase it until excessive and then lower by 1 when there is an obstruction to flow, the flow becomes _____ correct answer: turbulent turbulent flow is predicted by the ______ number, specifically when it exceeds ______ correct answer: Reynold's Number 2,000 the perceived change in frequency when there is relative motion between the source of sound and the reciever correct answer: Doppler effect a positive Doppler shift is displayed ____ the baseline, indicating the flow is traveling _____ the transducer correct answer: above toward a negative Doppler shift is displayed _____ the baseline, indicating the flow is traveling _____ the transducer correct answer: below away from for accurate velocity calculations, the incident angle must be _____ degrees or less to parallel with flow correct answer: 20 when the angle between the beam and blood flow is 90*, what velocity is perceived? correct answer: NO velocity is perceived, because no RBC's are coming toward or away from the transducer _____ frequencies result in lower Doppler shifts (better) correct answer: lower note: this is opposite from 2D imaging, where higher frequencies are better for resolution which Doppler format sends & receives from the same crystal, and is best when assessing for a velocity at a SPECIFIC location? correct answer: pulsed-wave Doppler