Siemens Acuson S1000 Instructions For Use Manual page 292

A p p e n d i x A T e c h n i c a l D e s c r i p t i o n
2D-mode
Measurements
Range or Formula
% Stenosis by Area 100(A1-A2)/A1
% Stenosis by Diam. 100(D1-D2)/D1
Amniotic Fluid Index* AFI=D1+D2+D3+D4
Bi-plane Volume (D1)(D2)(D3)(0.52)
Strain Ratio M
M
region of interest
* Values are adjusted for fewer than four distances (quadrants). For example, if the second and
fourth quadrants are measured, then the formula is "AFI=D2+D4." The minimum value is
"D2-Tol(D2)+D4-Tol(D4)" and the maximum value is "D2+Tol(D2)+D4+Tol(D4)."
Doppler Measurements
Doppler
Measurements Range or Formula
Velocity 20 – 600 cm/sec
Frequency
2F
F
0
Delta Velocity V1 - V2
Delta Frequency
2F
Time @ Slow Sweep 0 – 11.2 sec
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 Mean (MnVel
Velocity; TAMn ...+MnVel
N=Number of Velocities
Averaged
Time Averaged (MinVel
Minimum Velocity; +MinVel
TAMin
N=Number of Velocities
Averaged
A - 3 4
Minimum Value
100(A1-Tol(A1)-A2-
Tol(A2))/(A1+Tol(A1))
100(D1-Tol(D1)-D2-
Tol(D2))/(D1+Tol(D1))
D1-Tol(D1)+D2-Tol(D2)+
D3-Tol(D3)+D4-Tol(D4)
(D1-Tol(D1))(D2-Tol(D2))
(D3-Tol(D3))(.52)
/M ---
ROI1 ROI2
=Mean strain in a
ROI
Minimum Value
V-Tol(V)
Vcosθ/1540 2F
0
=Carrier Frequency
V1-Tol(V1)-V2-Tol(V2)
cosθ(V1-V2)/1540 2F
0
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
+MnVel + (MnVel
1 2
)/N +MnVel
N
...+MnVel
+MinVel +... (MinVel
1 2
)/N MinVel
N
MinVel
cosθ(V-Tol(V))/1540
0
cosθ(V1-Tol(V1)-
0
1 1 2
-Tol(MxVel )+MxVel -
2 n
)+...+MxVel -
n
))/N
-Tol(MnVel )
1 1
-Tol(MnVel )+
2 2
-Tol(MnVel ))/N
n n
-Tol(MinVel )+
1 1
-Tol(MinVel )+ ...+
2 2
-Tol(MinVel ))/N
n n
Maximum Value
100(A1+Tol(A1)-
A2+Tol(A2))/(A1-Tol(A1))
100(D1+Tol(D1)-
D2+Tol(D2))/(D1-Tol(D1))
D1+Tol(D1)+D2+Tol(D2)+
D3+Tol(D3)+D4+Tol(D4)
(D1+Tol(D1))(D2+Tol(D2))
(D3+Tol(D3))(.52)
---
Maximum Value
V+Tol(V)
2F cosθ(V+Tol(V))/1540
0
V1+Tol(V1)-V2+Tol(V2)
2F cosθ(V1+Tol(V1)-
0
V2+Tol(V2))/1540
T+Tol(T)@ Slow Sweep
T+Tol(T)@ Med Sweep
T+Tol(T)@ Fast Sweep
1 1
(MxVel +Tol(MxVel )+
2 2
MxVel +Tol(MxVel )+ ...+
n n
MxVel +Tol(MxVel ))/N
(MnVel +Tol(MnVel )+
1 1
MnVel +Tol(MnVel )+ ...+
2 2
MnVel +Tol(MnVel ))/N
n n
(MinVel +Tol(MinVel )+
1 1
MinVel +Tol(MinVel )+ ...+
2 2
MinVel + Tol(MinVel ))/N
n n
I n s t r u c t i o n s f o r U s e