Doppler Formulas - Siemens ACUSON Cypress Operator's Manual

Doppler Formulas

Doppler Formulas (Vascular)
TABLE 36.
Type Formula
(
Resistance
Maximum Velocity Minimum Velocity
------------------------------------------------------------------------------------------------------- -
Index (RI)
Maximum Velocity is the peak Systolic velocity.
Minimum Velocity is the end Diastolic velocity.
(
Pulsatility
Maximum Velocity Minimum Velocity
------------------------------------------------------------------------------------------------------- -
Index (PI)
Maximum Velocity is the peak Systolic velocity.
Minimum Velocity is the end Diastolic velocity.
TAV Maximum is the time-averaged Maximum velocity. Time
Averaged Velocity Maximum is the averaged (mean) value of
the maximum Doppler shift frequency.
Volume Flow
TAVMax CSA
TAVMax is the time-averaged maximum velocity (m/s). Time
Averaged Velocity Maximum is the averaged (mean) value of
the maximum Doppler shift frequency.
CSA is Cross Sectional Area (cm2).
Factor 60 converts to ml/min.
Ratio
Velocity A
------------------------- -
Velocity B
Systolic/
Systolic Velocity
-------------------------------------------
Diastolic
Diastolic Velocity
(S/D)
Internal
Highest ICA Velocity
--------------------------------------------------- -
Carotid/
Common
ICA velocity is the highest Internal Carotid Artery Peak Sys-
Carotid Ratio
tolic velocity.
(IC/CC)
CCA velocity is the mid Common Carotid Artery Peak Systolic
velocity.
ACUSON Cypress™ Operator's Manual
–
Maximum Velocity
–
TAV Maximum
60
× × ×
------- - 10
4
10
Mid CCA Velocity
Vascular Formulas and References
)
)
3
Units
—
—
l/min
(liters/
minute)
—
—
—
7-15