U60 Diagnostic Ultrasound System User Manual Cardiac Measurements and Calculations
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For the steps of heart rate, time and slope measurement, please refer to Section 6.5.2 Generic
Measurement in M mode.
To measure PG of a point on the Doppler wave:
PG[mmHg]=4*v
2
(1mmHg=0.133kPa)
1. Press Caliper to activate a measurement cursor “+”.
2. Roll the trackball to highlight PG and press Set and a “+” is displayed.
3. Roll the trackball and press Set to anchor the point, measuring velocity.
4. Roll the trackball and press Set to begin a new PG measurement. You can
measure a maximum of eight groups of data. The outcome will be displayed
in the measurement result window.
5. Press Caliper to finish and exit.
PHT is defined as the time needed for the peak transvalvular pressure gradient to
fall to its half value. The system also calculates MVA (mitral valve area)
automatically.
MVA(cm
2
)=220/PHT(ms)
To measure PHT:
1. Press Caliper to activate a measurement cursor “+”.
2. Roll the trackball to highlight PHT and press Set.
3. Roll the trackball and then press Set to anchor the start point.
4. Roll the trackball and then press Set to anchor the end point.
5. Roll the trackball and press Set to begin a new PHT measurement. You can
measure a maximum of eight groups of data. The outcome will be displayed
in the measurement result window.
6. Press Caliper to finish and exit.
NOTE: When performing the PHT measurement above the baseline,
ensure that the end point is lower than the start point; otherwise, the end
point cannot be fixed; and when performing the PHT measurement below
the baseline, ensure that the end point is higher than the start point.
To trace spectrum:
1. Press Caliper to activate a measurement cursor “+”.
2. Roll the trackball to highlight Trace and press Set and a “+” is displayed.
3. Roll the trackball and press Set to anchor the start point. Roll the trackball to
trace along the Doppler wave forward, or press Back to erase the trace
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