Doppler Formulas - Siemens ACUSON Cypress Operator's Manual

Cardiac Calculations
6-20

Doppler Formulas

Doppler Formulas (Cardiac)
TABLE 31.
Type Formula
Pressure
Pressure Gradient
Gradient
V is velocity.
Mean Velocity
Vmean
V is the average velocity between two successive velocity
trace points (m/s).
N is the number of velocity trace points.
Δ
trace points (seconds).
Mean Pressure
Gradient
Pmean
V is the average velocity between two successive velocity
trace points (m/s).
N is the number of velocity trace points.
Δ
trace points (seconds).
Time Velocity
TVI
Integral
ACUSON Cypress™ Operator's Manual
2
= 4V
N 1 –
∑
Δ
V
i ti
i = 1
= ---------------------- -
N 1 –
∑
Δ
ti
i = 1
is the time increment between two successive velocity
ti
N 1 –
∑
2
Δ
4V
i
ti
i = 1
= ---------------------------- -
N 1 –
∑
Δ
ti
i = 1
is the time increment between two successive velocity
ti
= area under curve
Units
mmHg
m/s
mmHg
m