Siemens ACUSON Antares, Инструкция по эксплуатации

Страница: 221 / 230

6 T e c h n i c a l D e s c r i p t i o n
[ 1 ] I N S T R U C T I O N S F O R U S E
6 - 21
Doppler Measurements
Doppler
Measurements Range or Formula Minimum Value Maximum Value
Velocity 20 – 600 cm/sec V-Tol(V) V+Tol(V)
Frequency
2F
0
Vcos
θ
/1540
F
0
=Carrier Frequency
2F
0
cos
θ
(V-Tol(V))/1540 2F
0
cos
θ
(V+Tol(V))/1540
Delta Velocity V1 - V2 V1-Tol(V1)-V2-Tol(V2) V1+Tol(V1)-V2+Tol(V2)
Delta Frequency
2F
0
cos
θ
(V1-V2)/1540 2F
0
cos
θ
(V1-Tol(V1)-
V2-Tol(V2))/1540
2F
0
cos
θ
(V1+Tol(V1)-
V2+Tol(V2))/1540
Time @ Slow
Sweep 0 – 11.2 sec T-Tol(T)@ Slow Sweep T+Tol(T)@ Slow Sweep
Time @ Med Sweep 0 – 5.6 sec T-Tol(T)@ Med Sweep T+Tol(T)@ Med Sweep
Time @ Fast Sweep 0 – 2.8 sec T-Tol(T)@ Fast Sweep T+Tol(T)@ Fast Sweep
Time Averaged
Maximum Velocity;
TAMx
(MxVel
1
+MxVel
2
+…+
MxVel
N
)/N
N=Number of Velocities
Averaged
(MxVel
1
-
Tol(MxVel
1
)+MxVel
2
-
Tol(MxVel
2
)+…+MxVel
n
-
Tol(MxVel
n
))/N
(MxVel
1
+Tol(MxVel
1
)+
MxVel
2
+Tol(MxVel
2
)+
…+MxVel
n
+
Tol(MxVel
n
))/N
Time Averaged
Mean Velocity;
TAMn
(MnVel
1
+MnVel
2
+
...+MnVel
N
)/N
N=Number of Velocities
Averaged
(MnVel
1
-
Tol(MnVel
1
)+MnVel
2
-
Tol(MnVel
2
)+ …+MnVel
n
-
Tol(MnVel
n
))/N
(MnVel
1
+Tol(MnVel
1
)+
MnVel
2
+Tol(MnVel
2
)+
…+MnVel
n
+
Tol(MnVel
n
))/N
Time Averaged
Minimum Velocity;
TAMin
(MinVel
1
+MinVel
2
+…
+MinVel
N
)/N
N=Number of Velocities
Averaged
(MinVel
1
-Tol(MinVel
1
)+
MinVel
2
-Tol(MinVel
2
)+
…+MinVel
n
-
Tol(MinVel
n
))/N
(MinVel
1
+Tol(MinVel
1
)+
MinVel
2
+Tol(MinVel
2
)+
…+MinVel
n
+
Tol(MinVel
n
))/N
Time Averaged
Mode Velocity;
TAMd
(MnVel
1
+MnVel
2
+…+
MnVel
N
)/N
N=Number of Velocities
Averaged
(MdVel
1
-Tol(MdVel
1
)+
MdVel
2
-Tol(MdVel
2
)+
…+MdVel
n
-Tol(MdVel
n
))/N
(MdVel
1
+Tol(MdVel
1
)+
MdVel
2
+Tol(MdVel
2
)+
…+MdVel
n
+Tol(MdVel
n
))/N
Resistivity Index (PS-ED)/PS (PS-Tol(PS)-ED-
Tol(ED))/(PS+Tol(PS))
(PS+Tol(PS)-
ED+Tol(ED))/(PS-Tol(PS))
Pulsatility Index (PS-ED)/TAV (PS-Tol(PS)-ED-
Tol(ED))/TAV+Tol(TAV)
(PS+Tol(PS)-ED-
Tol(ED))/(TAV-Tol(TAV))
Slope
(Acceleration) (V1-V2)/T (V1-Tol(V1)-V2-
Tol(V2))/(T+Tol(T))
(V1+Tol(V1)-V2+
Tol(V2))/(T-Tol(T))
Systolic/Diastolic
Ratio S/D (PS-Tol(PS))/(ED+Tol(ED)) (PS+Tol(PS))/(ED-Tol(ED))