GE Medical Systems 500, User Manual, Page: 255 / 636

General Calculations
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
8–5

Stroke Volume Ratio (SV)
To measure stroke volume, a velocity measurement is taken in
the Doppler spectrum. An FCA (Flow Cross Sectional Area) is
measured on the vessel in B-Mode. The velocity and FCA
values are then used to calculate SV (Stroke Volume).
Mean PG
Max PG CO
SV
HEART
RATE
TRACE
AUTO
FVO FV
Figure 8–3. General Calculations Sub-Menu (SV)
Select SV from the Calculation Sub-Menu. The trace cursor
(horizontal dotted line) appears in the Doppler spectrum.
Move the cursor to the measurement start point dependent on
the trace method chosen (peak, floor, mean or mode).
Press Set. The first cursor is fixed and a second is active.
If Trace Auto is enabled, use the Trackball to move the second
cursor to the velocity measurement end point.
Press Set. The waveform maximum velocities are
automatically traced and a velocity value is displayed.
If Trace Auto is disabled, use the Trackball to trace the
waveform.
Press Set. The trace waveform is fixed and the velocity value
is displayed.
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