
5-28
Operation Manual
Automatic Calculation
Some items in the measurement menu are automatically calculated based on measurements of other
items.
■
HC
This is automatically calculated using the following formula, provided there are measured BPD and
OFD values.
Exception: when you use Merz reference,
■
AC
This is automatically calculated using the following formula, provided there are measured APD and
TAD values.
Exception: when you use Merz reference,
■
FTA
This is automatically calculated using the following formula, provided there are measured APD and
TAD values.
■
ThC
This is automatically calculated using the following formula, provided there are measured APTD
and TTD values.
AFI (Amniotic Fluid Index)
This measures the amniotic uid index. Measurements are performed by dividing the pregnant
woman’s abdomen into four parts. The distance between the fetus and the farthest point of each area
is measured. To obtain the specic image from each quadrant plane, press the Freeze button to switch
to the diagnosis mode. After obtaining the image, press the Freeze button again to return to the
measurement mode.
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