5-14
Operation Manual
X
PS/ED: PS ED Ratio
X
ED/PS: ED PS Ratio
The formulae used for Manual Trace measurement are as follows:
X
Duration of flow
VTI
meanV =
X
PS
EDPS
RI
−
=
X
Vmean
EDPS
PI
−
=
Limited Trace
This is a basic measurement that is only available in Spectral Doppler Mode. You can specify two bars
on a Spectral Doppler image and calculate the mean velocity, RI, and Pulsatility Index (PI) between
them.
1. Select Limited Trace from the touch screen’s soft menu. Tap the bar’s start point on the touch
screen, and the end point bar will be displayed on the screen at a certain distance to the right of
the start point. Drag and drop the end point bar to adjust its position and take the measurement.
2. 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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