Measurement and Analysis
328 Vivid S5/Vivid S6 User Manual
R2424458-100 Rev. 2
Figure 7-43: Gestational sac measurement
Measuring GS sequentially
1. Scan and freeze an image of GS that you would like to
measure (use full screen).
2. Activate M&A and select GS (Hellman).
3. Measure the two diameters of the GS (as explained above).
The measurements will display on screen as d1 and d2.
4. Scan again to produce a view of a plane which is orthogonal
to the previous plane.
5. Activate M&A and select GS (Hellman).
6. Measure the GS diameter; this will be marked as d3.
After you complete the third distance measurement, the
system displays the gestational sac measurement in the
Results Window. It displays the three diameters d1, d2
and d3. In addition it shows the average diameter GS and
the corresponding estimated age.
Amniotic Fluid Index (AFI)
To calculate the amniotic fluid index, you make
measurements of the four quadrants of the uterine cavity. The
system adds these four measurements together to calculate
the Amniotic Fluid Index.
Note: The four quadrants can be measured with distance
(caliper) or circumference (circle) measurements. Press the
appropriate AFI quadrant Top/Sub Menu key to toggle between
caliper and circle.
1. Select OB-2/3, then AFI(Moore) located just under it.
The first distance measurement, AFI-Q1, is already
selected.
2. Make a standard distance measurement for the first
quadrant:
• To position the active caliper at the start point, move the
Trackball.
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