5-4 Obstetrics
The system does not calculate the OB growth percentile if:
A FG table is not normal distributed.
There is no upper/ lower deviation set in the FG table.
The FG table has the upper/ lower deviation set, but certain clinical GA value has no upper/
lower deviation or the deviation value is not plus. The fetal growth curve is not affected. E.g.
Jeanty FG table of RAD.
The OB growth percentile is displayed in the result window, measurement report, exported
PDF/RTF report and the OB structured report, and it supports print viewing and printing.
5.4 Obstetric Measurement Tools
The system supports the following 2D/M/Doppler obstetric measurements.
NOTE: 1. Measurement tools mentioned below are configured in the system. The application
measurement packages provided in this system are generally different
combinations of measurement tools. For more information about package preset,
see "2.4.2.2 Application Measurement Preset".
2. The Smart NT must be used with convex-wide probe and good image quality. If an
evident inaccurate recognition exists, please confirm the target profile manually
and adjust the result.
3. If the results of the calculation items of CI, FL/BPD, FL/AC, HC/AC and FL/HC
exceeds the clinical range, the result value displays as “value*”.
2D Obstetric Measurements
Types Tools Descriptions Methods or formulae
Measurement
GS Gestational Sac Diameter
Distance in 2D General
Measurements
YS Yolk Sac
CRL Crown Rump Length
Line (same as Distance in 2D
General Measurements), Trace,
Spline
NT Nuchal Translucency
Distance in 2D General
Measurements (Support Smart
NT method if the Smart NT
function is configured)*
HC
1
Head Circumference Area in 2D General
Measurements (Support Smart
OB method if the Smart OB
function is configured)
AC Abdominal Circumference
BPD Biparietal Diameter
Distance in 2D General
Measurements (Support Smart
OB method if the Smart OB
function is configured)
OFD Occipital Frontal Diameter
FL Femur Length
1
Head Circumference: in HC measurement, if the measure cursor of BPD appears on the screen, then the
measurement starting point will be automatically posited at the measure cursor starting point of the last BPD; if you
use “Ellipse” to measure the HC, the measure cursor of the last BPD will be the first axis of the ellipse in the default
status.
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