Vascular Calculations
7-14 ACUSON Cypress™ Operator’s Manual
Vascular Formulas and References
2D Formulas
TABLE 35. 2D Formulas (Vascular)
Type Formula Units
Percent
Stenosis
Area
A is the greater of area 1 and area 2 (cm
2
).
a is the lesser of area 1 and area 2 (cm
2
).
%
Percent
Stenosis
Diameter
D is the greater of diameter 1 and diameter 2 (cm).
d is the lesser of diameter 1 and diameter 2 (cm).
%
Volume Flow
TAVMax is the time-averaged maximum velocity (m/s).
CSA is Cross Sectional Area (cm2).
Factor 60 converts to ml/min.
l/min
(liters/
minute)
HWL (Volume)
L is the longitudinal axis.
W is the transverse axis.
H is the anteroposterior axis.
ml
Aa–()
A
----------------- 10 0×
Dd–()
D
------------------ 100×
TAVMax CSA×
60
10
4
-------- 10
3
××
4
3
--- π
L
2
---
W
2
-----×
H
2
----×××
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