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Additional Cardiac Calculations
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
10–29

S/D (D/S) Ratio, RI, A/B Ratio or PI
To measure the systolic/diastolic (diastolic/systolic) ratio,
resistance index, velocity ratio and pulsatility index:
PI RI Transf
CALCs
S/D
Ratio
A/B
Ratio
HEART
RATE
TRACE
AUTO
Transf CALCS is only available with Realtime Doppler Calculation option installed
Figure 10–33. Cardiac Calculation Sub-Menu
Select S/D (D/S) RATIO, RI, A/B RATIO or PI from the
Calculations Sub-Menu. Perform peak velocity measurements
as described on
7–14 .
The first cursor is the start point on the Doppler waveform. This
would be systole for S/D ratio (diastole for D/S ratio), peak
velocity for RI, “A” velocity for A/B ratio and V
MAX
for PI.
The second cursor is the end-point cursor to the end point of
the Doppler waveform. This would be diastole for S/D ratio
(systole for D/S ratio), minimum velocity for RI, “B” velocity for
A/B ratio and Vd for PI.
NOTE: For the PI calculation, if Trace Auto is not selected,
manually trace the waveform between V
MAX
and Vd.
If 2 velocity measurements are made prior to selecting S/D
(D/S) ratio, A/B ratio or RI, the system automatically calculates
S/D (D/S) ratio, A/B ratio or RI from the last two velocity
measurements recorded.
NOTE: For the PI calculation, if Trace Auto is on, the system
automatically traces the waveform when Set is pressed to fix
Vd.
With S/D (D/S), PI and RI, if “Vd” is selected as the diastole
velocity in Preset Program page 4, the end point is defined as
Vd if Trace Auto is OFF.
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