Samsung HS50 Manual do Utilizador Página 162

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User Manual
Manual Trace
This is a basic measurement that is only available in Spectral Doppler mode. You can specify a point
on a Spectral Doppler image and trace a curve from that point to calculate the blood ow velocity,
mean velocity, RI and Pulsatility Index(PI).
1. Select Manual Trace on the monitor or touch screen.
2. Trace the curve. When the measurement has been taken, the result is shown on the screen. The
measurement results displayed will vary, depending on the settings you have selected in Setup
> Measurement > Library > Caliper > D > Manual Trace.
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
The equations used for Trace measurement are as follows:
X
Duration of flow
VTI
mean
V
=
X
PS
EDPS
RI
=
X
Vmean
EDPS
P
I
=
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