10.3.1.1 GS (Gestational Sac)
There are two methods to measure the GS:
1.
Three distance measurement (mean value = GS diameter)
2.
One distance measurement (value = GS diameter)
Method 1
The three distance measurement requires three measurements (length, width, height) before
the age is displayed. The age is derived from the mean value of all three measurements.
The workflow is identical to the measurement "3 Dist".
Method 2
One distance measurement is required before the age is displayed. The age is derived from
the distance measurement.
To use this method:
1.
Select GS. A cursor appears.
2.
Measure the GS distance like a normal distance measurement. The result is displayed
immediately.
10.3.1.2 Sono NT (Nuchal Translucency)
Note
This measurement can be adjusted and customized in the system setup.
To measure the contour detection of the NT border:
1.
Select
NT
. The measurement cursor appears.
2.
Select the fetal position ("Face Up" or "Face Down").
3.
Position and fix the first point P1 of the rectangular ROI.
4.
Position and enter the second point P2 of the rectangular ROI. The NT border detection
is performed. If a valid result is found, the borders are shown in red and the NT distance
is displayed with two crosses.
5.
Only if the found measurement is correct according to the guidelines, accept and confirm
the result. Then it will be stored in the report. If the system cannot detect a result, a
warning message appears.
Note
If the current US image magnification is too low (the corresponding pixel size is bigger than
0.1mm), a magnification hint is displayed if activated in the system setup. When this hint
appears, increase the magnification and redo the measurement.
Note
It is possible to select the calculation method by pressing Method: (i-i: inner-inner or i-m: inner-
middle).
Figure 10-3 Display of the Sono NT analysis (sample)
Measurements and Calculations
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Voluson™ SWIFT / Voluson SWIFT+ Instructions For Use
5831612-100 Revision 4
Содержание Voluson Swift
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