Vascular Formulas And References; Formulas - Siemens ACUSON Cypress Operator's Manual

Vascular Calculations
7-14

Vascular Formulas and References

Formulas

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