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Schematic description of Doppler velocimetry. PSV (peak systolic velocity), VTI (velocity time integral), SAT (systolic acceleration time), SD-DT (systolic deceleration-diastolic time), HB (heartbeat). PSV, peak systolic velocity; VTI, velocity time integral; SAT, systolic acceleration time; SD-DT, systolic deceleration-diastolic time.
