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8.4.3 PW Mode Measurements
Flow sweep ratio, speed, time, heart rate, acceleration and spectrum trace measurements can be
performed in
the PW mode. You can also press [BC General Measurements] to enter the general
measurements in the 2D
mode. For details, please refer to Section 8.5.1 2D Mode Measurements.
8.4.3.1 Flow Speed Ratio
It is used to calculate the flow speed ratio and Pressure Gradient (PG) on the Doppler-mode image
by
measuring the flow speed of peak systole and end diastole.
Step:
1.
Press the PW key on the control panel to enter the PW mode.
2.
Press the Caliper key to activate the measurement, and the measurement menu displays on the
top
left of the screen.
3.
Select [S/D] on the menu by moving the trackball and press Set to confirm. A marker displays on
the image.
4.
Move the marker to the flow speed of peak systole by using the trackball, press Set to fix the
marker and the second marker displays.
5.
Move the second marker to the flow speed of end diastole by using the trackball and press Set.
The measurement result displays in the result box.
8.4.3.2 Speed
It is used to measure the speed of one point on the spectral Doppler waveform.
1.
Press the PW key on the control panel to enter the PW mode.
2.
Press the Caliper key to activate the measurement, and the measurement menu displays on the
top left of
the screen.
3.
Select [Velocity] on the menu by moving the trackball and press Set to confirm. A marker
displays on the image.
4.
Move the marker to the desired point by using the trackball and press Set. The measurement
result displays in the result box.
8.4.3.3 Time
It is used to measure the time interval between two points on the spectral Doppler image.
Steps:
1.
Press the PW key on the control panel to enter the PW mode.
2.
Press the Caliper key to activate the measurement, and the measurement menu displays on the
top
left of the screen.
3.
Select [Time] on the menu by moving the trackball and press Set to confirm. A marker displays
on the image.
4.
Move the marker to the starting point by using the trackball, press Set to fix the marker and the
second marker displays.
5.
Move the second marker to the end point by using the trackball and press Set. The measurement
result
displays in the result box.
8.4.3.4 Heart Rate
It is used to measure the time interval between heart cycles based on the number of heartbeats per
minute on the PW mode image.
Steps: