3 Using the touchpad, position the vertical
caliper at the peak of the heartbeat.
4 Press the
key.
SELECT
A second vertical caliper appears.
5 Using the touchpad, position the second
vertical caliper at the peak of the next
heartbeat.
Save the calculation. (See "To save a
6
calculation" on page 51.)
OB Doppler Calculations
Menu
OB
Heading
Calculation
MCA (Middle
S/D, RI
Cerebral
Artery)
S/D, RI, PI*
Umb A
S/D, RI
(Umbilical
Artery)
S/D, RI, PI*
*Calculation requires a trace measurement.
To calculate MCA or Umba (Doppler)
Note: The system does not provide an MCA/UmbA
ratio from the PI (Pulsatility Index).
1 Select OB exam type, and select LMP or
Estab.DD in the patient information form.
2 On a frozen Doppler spectral trace, press the
key.
CALCS
3 Do the following for each measurement you
need to take:
a From the calculations menu, select the
measurement name under MCA (Middle
72
Exam-based calculations
Results
SD
RI
SD
RI
PI
Small Parts calculations
SD
Small Parts calculations include volume, hip
RI
angle, and d:D ratio. For instructions to calculate
volume, see "Volume calculations" on page 54.
SD
Transducer
RI
PI
HFL38x
HFL50x
L38x
L38xi
To calculate hip angle
1 On a frozen 2D image, press the
2 From the calculations menu, select Right or
3 Select Baseline under Hip Angle.
Cerebral Artery) or UmbA (Umbilical
Artery).
b Position the calipers:
• For S/D, RI, position the first caliper at
the peak systolic waveform. Press the
key, and position the second
SELECT
caliper at the end diastole on the
waveform.
• For S/D, RI, PI, position the caliper at
the beginning of the desired waveform,
and press the
SELECT
touchpad to manually trace the desired
area. Press the
SET
If calipers are not positioned correctly,
the calculation result is inaccurate.
Save the calculation. (See "To save a
c
calculation" on page 51.)
Only one calculation (S/D, RI or S/D, RI, PI)
can be saved.
Exam Type
Small Parts
Small Parts
Small Parts
Small Parts
Left.
A baseline appears on‐screen.
key. Use the
key.
key.
CALCS