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6-3. 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 blow
base line.
Pulsatility Index
PI
PI = (S - MIN) / MN
PI < 99.99
S/D ratio
SD
SD = S / D
Heart rate [BPM]
HR
Max volume flow
MAX
Mean volume flow
MN
Vessel diameter
DIAM
Samples displayed on LCD;
Unit: cm/s
Unit: kHz