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3-5. Numerical data
Parameters Abbrs. Definitions
Systolic velocity [cm/s] or
Systolic Doppler shift [kHz]
S
Mean velocity [cm/s] or
Mean Doppler shift [kHz]
MN
Diastolic velocity [cm/s] or
diastolic Doppler shift [kHz]
D
Minimum velocity [cm/s] or
minimum Doppler shift [kHz]
MIN
Resistance Parameter RP RP=(S-D) / S
RP=1 if waveform goes below base line.
Pulsatility Index PI PI=(Peak-to-peak) / MN
PI
99.99
S/D ratio SD SD=S / D
Heart rate [BPM] HR
Samples displayed on LCD
Unit: cm/s
Unit: kHz
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