GE Voluson S6 Basic User Manual page 428

Measurements and Patient Worksheets (Reports)
11.2.4.20 Fractional Limb
11-52
This measurement is for calculating the fetal limbs. Based on this partial volume-calculation
the fetal weight can be estimated.
Figure: Fractional limb volume. Fractional Arm (AVol) and Thigh (TVol) volumes are based on
50% of the humeral (A) or femoral (B) diaphysis length. Mid-limb measurements eliminates the
need for tracing soft tissue borders near the ends of the bone shaft, where acoustic shadowing
is more likely to be encountered.
Method: The slice positions are determined automatically depending on the reference distance
line, the slice number and the percentage of limb and displayed graphically on screen. The
volume is calculated after the area measurements are done on the slices.
1. 100% Limb length
(reference length)
2. Percentage of limb
Number of slices: fixed to 5Percentage of Limb: fixed to 50%
Operation:
1. Activate a Fractional Limb study by selecting the measure group [Fract. Limb] in the
Calc. menu, application OB/Biometry. The Fractional Limb measure items appear on the
screen. Select the corresponding fetus number if necessary.
2. Select the measurement [A Vol] or [T Vol]. The Fractional Limb edit menu appears on
the menu area.
3. Reference distance line
4. Equidistant Slice positions
(start/end depend on percentage
of limb)
Voluson® S6/S8 Basic User Manual
5433669-100 Revision 4