3. Repeat step 2 to define the second diameter. The vessel diameter stenosis % is
automatically calculated and displayed.
10.2.7 Generic Doppler Measurements
Basic Information
•
To get the best resolution and accuracy from Doppler measurements, the
Angle
correction cursor must be positioned parallel to the vessel axis (in the area of the
measuring volume).
•
If more measurements are performed the current measurement will be placed in the top
right corner. The previous measurements are displayed above (in successive order, like
a shift register).
•
Except for Auto Trace measurements, all measurement results will be automatically
included in the corresponding Worksheet. To store Auto Trace measurement results,
press the right or left trackball key
Set
previously.
•
Depending on the selected measurement package setting and the adjustment in the
Measure Setup:
○
RI and PI will be calculated using ED (End Diastole) or MD (Mid Diastole)
Note
Vdiastole = Vend-diastole or Vmin (depending on this selection)
○
all previously set measuring marks are erased when starting a new scan (unfreeze
-> Run mode)
○
the Spectral Doppler envelope curve is performed with a continuous trace line or
by setting points
○
the Doppler measuring results (according to the “Auto/Manual Trace” setting) are
displayed after an Auto- or Manual Trace measurement (Setting will be ignored in
Cardiac calculations).
○
measurement items (e.g., BPD) will be shown with or without the Author’s Name.
•
Depending on the setting in the Measure Setup:
○
all previously set measuring marks are erased when activating cine mode.
○
a new cursor appears to repeat the measurement, or not
○
the caliper (the last measuring mark of the current measurement) is fixed when
pressing the Freeze key, the P keys, Save key, etc., or not
Moreover, many display properties depend on the setting in the Measure Setup.
Vel.
To measure the velocity:
1. Select
Vel.
. The measurement cursor and a horizontal line "hanging" on the cursor
appear.
2. Position the velocity point and fix it with
Set
. The measurement is finished and
Vel.
is
switched off.
AutoTrace
To measure the AutoTrace:
1. Select
Auto Trace
to start the trace calculation. It traces the Doppler spectrum
automatically and displays the results.
2. Edit the trace if necessary (adjust sensitivity, trace mode, angle, starting/End point).
Measurements and Calculations
Voluson™ SWIFT / Voluson SWIFT+ Instructions For Use
5831612-100 R
evision 4 10-11
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