Measurement and Calculation
8-23
screen, for example a, b and c. Press∠∠ ∠ Meas and select to enter angle measurement
screen. A + cursor will appear on the screen. Operate the touchpad to move the cursor to the
start point of the first line and press
Enter. The + is fixed and a second movable + appears.
Move the second cursor to the intersecting point of the two lines and press Enter. A second
+ is fixed on this intersecting point and letter a (or b, c) is displayed. Move the cursor to the
end point of the other line and press
Enter. A third + is fixed. Value of the angle is displayed
in the format of “∠a: xxx°” (or b∠ , c∠ , etc.) in the result area. The first + cursor is
movable. Pressing
Enter to toggle the + cursors between the states of being fixed or
movable.
8.3.9 Obstetrics Calculation
8.3.9.1 Obstetrics Distance
Set exam type as Obstetrics (the same setting for the following sections of Obstetrics
measurement). In B, 2B, 4B or B/M mode, press
Calc to measure fetal growth and EDD.
Its measuring process is the same as that of distance measurement. The measuring
result is displayed as the measurement item plus “Dist: xxx.xx mm”; For measurement
item with EDD empirical equation, the result will also include GA: xxWxxD “”and “EDD:
Y/M/D“.
8.3.9.2 Obstetrics Circumference
In B, 2B, 4B or B/M mode, press
Calc to measure fetal growth and EDD. Its measuring
process is the same as that of Ellipse circumference/area. The measuring result is
displayed in three lines as “C: xxx.xx mm GA: xxWxxD EDD: Y/M/D”.
8.3.9.3 Obstetrics Fetal Weight
There are seven empirical equations for measuring obstetrics fetal weight. When the
exam type is Basic OB, Complete OB or Mult Gest, in B, 2B, 4B or B/M mode, press
Calc key to enter calculation menu. Select EFW-Shepard, EFW-Hadlock1,
EFW-Hadlock2, EFW-Hadlock3, EFW-Hadlock4, EFW-Campbell or EFW-Hansmann,
and its corresponding screen will appear.
a) Shepard method: Shepard method estimates fetal weight by the measured AC and
BPD. Enter EFW-Shepard. “Weight: g GA: xxWxxD EDD: Y/M/D“ is
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