Vascular Calculation Formulas - GE Logiq 500 User Manual

Vascular Calculation Formulas

Calc
Mnemonic
RT ECA Right External Carotid Artery
Velocity
RT CCA Right Common Carotid Artery
Velocity
RT BIFURC Right Carotid Bifurcation Velocity
RT ICA Right Internal Carotid Artery
Velocity
RT ICA/CCA Right Internal Carotid Artery
Velocity/Common Carotid Artery
Velocity Ratio
LT ECA, LT CCA, Same as above, for Left Carotid
LT BIFURC, Artery
LT ICA,
LT ICA/CCA
A/B Ratio Velocities Ratio
% Stenosis Stenosis Ratio
S/D Ratio Systolic Velocity/Diastolic
Velocities Ratio
PI Pulsatility Index
RI Resistivity Index
HR Heart Rate (beats/minute)
*NOTE*: V
diastole
Table 11–1. Vascular Calculation Formulas
LOGIQ 500 Basic Users Manual
2233658–100 Rev. 0
Calc Name Input Measurements
one Doppler blood flow
peak velocity
one Doppler blood flow
peak velocity
one Doppler blood flow
peak velocity
one Doppler blood flow
peak velocity
two Doppler blood flow
peak velocities
Same as above
two Doppler blood flow
peak velocities
two areas (by ellipse, trace,
circle or distance)
two Doppler blood flow
peak velocities
two Doppler blood flow
peak velocities and TAMAX
two Doppler blood flow
peak velocities
one 2 beat time interval
(measured manually or
automatically)
= V or V (depends on preset selection)
min end–diastole
Vascular Summary Report
Formula
RT ECA=v1
[cm/s or m/s]
RT CCA=v1
[cm/s or m/s]
RT BIFURC=v1
[cm/s or m/s]
RT ICA=v1
[cm/s or m/s]
RT ICA/CCA=V
Same as above
A/B=V /V
1 2
% Stenosis=[1–(A
A )]x100
lumen
S/D=V /V
systole
*NOTE*
PI=(V –V
max diastole
TAMAX
RI=(V –V
max diastole
V
max
HR[BPM]=120[sec]/
2beat time[sec]
11–9
/V
ICA CCA
/
residual
diastole
)/
*NOTE*
)/
*NOTE*