Samsung PT60A User Manual Page 135

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5-15
Chapter 5 Measurements and Calculations
The equations used for D Limited Trace measurement are as follows:
X
Duration of flow
VTI
meanV =
X
PS
EDPS
RI
=
X
Vmean
EDPS
PI
=
X
2
1
21
/
V
V
VV =
Auto Trace
This is a basic measurement that is only available in Spectral Doppler mode. When measurement
starts, the system traces a spectrum automatically. You can calculate the mean blood ow velocity, RI,
and Pulsatility Index (PI).
1. Select Auto Trace from the touch screens soft menu.
2. The system traces a spectrum automatically.
3. You can redene the measurement range by adjusting the two bars generated at the ends of the
Spectral Doppler image.
4. When the measurement is nished, its result is shown on the screen.
X
PS: Peak Systolic Velocity
X
MD: Min Diastolic Velocity
X
ED: End Diastolic Velocity
X
TAmax: Time Averaged Max Velocity
X
PI: Pulsatility Index
X
RI: Resistivity Index
X
PS/ED: PS ED Ratio
X
ED/PS: ED PS Ratio
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