98 Chapter 4: Measurements and Calculations
Meas. & Calcs
Pressure Half Time
(PHT)
Note: PHT is calculated by measuring deceleration time from peak to baseline.
1 On a frozen Doppler spectral trace, press the Calcs key.
2 Highlight MV and press the Select key.
3 Select PHT.
4 Position the first caliper at the peak and press the Select key.
A second caliper is displayed.
Position the second caliper along the EF slope.
5 Select Save from the on-screen menu, or press the Enter key to save
the measurement to the patient report.
The saved measurement is displayed at the bottom of the calculation
menu and a check mark is put in front of the measurement.
If desired, press the Save key to save the image with the
measurements displayed.
Delta Pressure:
Delta Time (dP:dT)
Note: To perform the dP:dT measurements, the Doppler scale must include
velocities of 300 cm/s or greater on the negative side of the baseline.
1 On a frozen Doppler spectral trace, press the Calcs key.
2 Highlight MV or TV and press the Select key.
3 Select dP:dT and press the Select key.
A horizontal dotted line with an active caliper is displayed at 100
cm/s.
4 Position the first caliper along the beginning of the wave form at 100
cm/s.
5 Press the Select key.
A second horizontal dotted line with an active caliper is displayed at
300 cm/s.
6 Position the second caliper along the beginning of the wave form at
300 cm/s.
7 Select Save from the on-screen menu, or press the Enter key to save
the measurement to the patient report.
The saved measurement is displayed at the bottom of the calculation
menu and a check mark is put in front of the measurement.
If desired, press the Save key to save the image with the
measurements displayed.
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