GE Medical Systems 500, User Manual, Page: 336 / 636

Additional Cardiac Calculations
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
10–24

PHT (Pressure Half Time)
A PHT measurement is used to calculate Mitral Valve Area
(MVA). The measurement is taken on the Doppler spectral
display of the mitral valve.
Figure 10–26. PHT Measurement on Mitral Valve Waveform
Select PHT from the Calculation Sub-Menu. Perform a time
interval measurement as described
7–18
. Set the first cursor
on the peak of the mitral valve waveform and the second on to
a point halfway down the mitral valve waveform slope.
MVA Mean PG LV
Report
PHT ET Max PG TRACE
AUTO
Figure 10–27. Cardiac Calculation Sub-Menu
MVA (Mitral Valve Area)
A Mitral Valve Area is calculated from the pressure half time
measurement. If PHT was selected, MVA is also calculated. If
MVA is selected, PHT must be measured in order to calculate
MVA.