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Doppler Measurements
Doppler
Measurements
Range or Formula
Velocity
20 – 600 cm/sec
Frequency
2F
0
F
=Carrier Frequency
0
Delta Velocity
V1 - V2
Delta Frequency
2F
0
Time @ Slow
0 – 11.2 sec
Sweep
Time @ Med Sweep
0 – 5.6 sec
Time @ Fast Sweep
0 – 2.8 sec
Time Averaged
(MxVel
Maximum Velocity;
MxVel
TAMx
N=Number of Velocities
Averaged
Time Averaged
(MnVel
Mean Velocity;
...+MnVel
TAMn
N=Number of Velocities
Averaged
Time Averaged
(MinVel
Minimum Velocity;
+MinVel
TAMin
N=Number of Velocities
Averaged
Time Averaged
(MnVel
Mode Velocity;
MnVel
TAMd
N=Number of Velocities
Averaged
Resistivity Index
(PS-ED)/PS
Pulsatility Index
(PS-ED)/TAV
Slope
(V1-V2)/T
(Acceleration)
Systolic/Diastolic
S/D
Ratio
[ 1 ]
I N S T R U C T I O N S
F O R
Minimum Value
V-Tol(V)
Vcosθ/1540
2F
V1-Tol(V1)-V2-Tol(V2)
cosθ(V1-V2)/1540
2F
V2-Tol(V2))/1540
T-Tol(T)@ Slow Sweep
T-Tol(T)@ Med Sweep
T-Tol(T)@ Fast Sweep
1
2
+MxVel
+...+
(MxVel
N
)/N
Tol(MxVel
Tol(MxVel
Tol(MxVel
+MnVel
+
(MnVel
1
2
)/N
Tol(MnVel
N
Tol(MnVel
Tol(MnVel
+MinVel
+...
(MinVel
1
2
)/N
MinVel
N
...+MinVel
Tol(MinVel
+MnVel
+...+
(MdVel
1
2
)/N
MdVel
N
...+MdVel
(PS-Tol(PS)-ED-
Tol(ED))/(PS+Tol(PS))
(PS-Tol(PS)-ED-
Tol(ED))/TAV+Tol(TAV)
(V1-Tol(V1)-V2-
Tol(V2))/(T+Tol(T))
(PS-Tol(PS))/(ED+Tol(ED))
U S E
Maximum Value
V+Tol(V)
cosθ(V-Tol(V))/1540
2F
0
V1+Tol(V1)-V2+Tol(V2)
cosθ(V1-Tol(V1)-
2F
0
V2+Tol(V2))/1540
T+Tol(T)@ Slow Sweep
T+Tol(T)@ Med Sweep
T+Tol(T)@ Fast Sweep
1
-
(MxVel
1
2
)+MxVel
-
MxVel
2
n
)+...+MxVel
-
...+MxVel
n
))/N
Tol(MxVel
-
(MnVel
1
)+MnVel
-
MnVel
1
2
)+ ...+MnVel
-
...+MnVel
2
n
))/N
Tol(MnVel
n
-Tol(MinVel
)+
(MinVel
1
1
-Tol(MinVel
)+
MinVel
2
2
-
...+MinVel
n
))/N
Tol(MinVel
n
-Tol(MdVel
)+
(MdVel
1
1
-Tol(MdVel
)+
MdVel
2
2
-Tol(MdVel
))/N
...+MdVel
n
n
(PS+Tol(PS)-
ED+Tol(ED))/(PS-Tol(PS))
(PS+Tol(PS)-ED-
Tol(ED))/(TAV-Tol(TAV))
(V1+Tol(V1)-V2+
Tol(V2))/(T-Tol(T))
(PS+Tol(PS))/(ED-Tol(ED))
6 T e c h n i c a l D e s c r i p t i o n
cosθ(V+Tol(V))/1540
0
cosθ(V1+Tol(V1)-
0
1
1
+Tol(MxVel
)+
2
2
+Tol(MxVel
)+
n
+
n
))/N
+Tol(MnVel
)+
1
1
+Tol(MnVel
)+
2
2
+
n
))/N
n
+Tol(MinVel
)+
1
1
+Tol(MinVel
)+
2
2
+
n
))/N
n
+Tol(MdVel
)+
1
1
+Tol(MdVel
)+
2
2
+Tol(MdVel
))/N
n
n
6 - 2 1
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