GE LOGIQ 7, Basic User Manual

Page: 396 / 984

General Measurements and Calculations
7
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90 LOGIQ 7 Basic User Manual
Direction 2392206-100 Rev. 1
Mean Pressure Gradient (PG)
To measure Mean PG (Mean Pressure Gradient):
1. From the Doppler Generic Touch Panel, select Max PG .
The system displays a trace caliper.
2. To position the caliper at the beginning of the waveform
(V
max
), move the Trackball .
3. To fix the start point, press Set .
The system displays a second active caliper.
4. To trace the waveform from V
max
to V
d
move the Trackball .
5. To complete the measurement, press Set .
The system displays TAMAX and Mean PG in the Results
Window.
If Trace Auto is selected, the waveform is automatically traced
after the second caliper is fixed.
If Trace Auto is not selected, manually trace the desired portion
of the waveform.
Automatic
Calculation of
Mean PG
If velocity was previously measured and calculated in Doppler
Mode, Mean PG is calculated from the velocity value when
Mean PG is first selected in the Touch Panel.
The waveform is automatically traced. Velocity and Mean PG
are also displayed on the screen.
If Trace Auto is off, the Auto Trace function is off and traces can
be performed manually.