User guide

68 Exam-based calculations
b Position the calipers:
•For S/D, RI, position the first caliper at
the peak systolic waveform. Press the
SELECT key, and position the second
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 key. Use the
touchpad to manually trace the desired
area. Press the
SET key.
If calipers are not positioned correctly,
the calculation result is inaccurate.
c Save the calculation. (See “To save a
calculation” on page 47.)
Only one calculation (S/D, RI or S/D, RI,
PI) can be saved.
Small Parts calculations
Small Parts calculations include volume, hip angle,
and d:D ratio. For instructions to calculate volume,
see “Volume calculations” on page 50.
To calculate hip angle
1 On a frozen 2D image, press the CALCS key.
2 From the calculations menu, select Right or
Left.
3 Select Baseline under Hip Angle.
A baseline appears on-screen.
4 Position the baseline, and press the
SET key.
(See “Working with calipers” on page 43.)
Line A (alpha line) appears on-screen, and Line
A is selected in the calculations menu.
5 Position Line A, and save the measurement.
(See “To save a calculation” on page 47.)
Line B (beta line) appears on-screen, and Line
B is selected in the calculations menu.
6 Position Line B, and save the measurement.
To calculate d:D ratio
1 On a frozen 2D image, press the CALCS key.
2 From the calculations menu, select Right or
Left.
3 Under d:D Ratio, select Fem Hd (femoral
head).
4 Using the touchpad, position and resize the
circle. The
SELECT key toggles between position
and size.
5 Press the
SET key.
The baseline automatically appears with the left
caliper active.
6 Position the caliper. (See “Working with
calipers” on page 43.)
7 Save the measurement. (See “To save a
calculation” on page 47.)
Transducer Exam Type
HFL38x Small Parts
HFL50x Small Parts
L38x Small Parts
L38xi Small Parts