Chapter 4: Measurements and Calculations 69
Meas. & Calcs
The following table shows the trace results displayed by exam type:
Velocities,
Elapsed Time,
+/x Ratio,
Resistive
Index (RI),
Acceleration
1 On a frozen Doppler spectral trace, press the Caliper key.
A single caliper is displayed on-screen with the following menu
options:
First caliper
Second caliper
Manual
Delete
2 Use the touchpad to position the first caliper to a peak systolic wave
form.
3 Press the Caliper key or select the second caliper from the on-screen
menu.
A second caliper is displayed on the screen.
4 Use the touchpad to position the second caliper at the end diastole on
the wave form.
The results are displayed in the measurement and calculation data
area. They are updated as the caliper moves and are completed when
you finish moving the calipers.
Note: A measurement taken with the second caliper provides a second
velocity, elapsed time, +/x ratio, RI, and acceleration.
5 If desired, press the Save key to save the image with the
measurements displayed.
Note: The measurements cannot be saved to the patient report.
Table 1: Trace Calculations by Exam Type
Cardiac Vascular OB/Gyn
Abdominal
and Other
Velocity Time Integral (VTI) X
Peak Velocity (Vmax) XXX X
Mean Pressure Gradient (PGmean) X
Mean Velocity on Peak Trace (Vmean) X
Pressure Gradient (PGmax) X
Time Average Mean (TAM)* X X
+/× or Systolic/Diastolic (S/D) X X X
Pulsatility Index (PI) X X X
End Diastolic Velocity (EDV) X
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