User guide

52 General calculations
The system is limited to the following
sample volume sizes:
• C11x transducer: 1, 2, 3 Gate Size
(mm)
• C60x and P10x transducers: 2, 3, 5, 7,
10, 12 Gate Size (mm)
• HFL38x, L25x, and SLAx transducers: 1,
3, 5, 6, 7, 8, 10, 12 Gate Size (mm)
• L38x transducer: 1, 3, 5, 7, 10, 12 Gate
Size (mm)
• L38xi transducer: 1, 3, 5, 6, 7, 8, 10, 12
Gate Size (mm)
• P21x transducer: 2, 3, 5, 7, 11.5, 14
Gate Size (mm)
• Precision in placing the caliper
• Accuracy in angle correction
The considerations and degree of accuracy for
volume flow measurements and calculations are
discussed in the following reference:
Allan, Paul L. et al.
Clinical Doppler Ultrasound ,
4th Ed., Harcourt Publishers Limited, (2000)
36-38.
To calculate volume flow
1 If measuring the diameter instead of using the
gate size, perform the 2D measurement:
a On a frozen full-screen 2D image or duplex
image, press the
CALCS key.
b From the calculations menu, select D
(distance) under Vol Flow.
c Position the calipers. (See “Working with
calipers” on page 43.)
d Save the calculation. See “To save a
calculation” on page 47.
2 Perform the Doppler measurement:
a On a frozen Doppler spectral trace, press the
CALCS key.
b From the calculations menu, select TAM or
TAP under Vol Flow.
A vertical caliper appears.
c Using the touchpad, position the vertical
caliper at the beginning of the waveform.
If calipers are not positioned correctly, the
calculation result is inaccurate.
d Press the
SELECT key to display a second
vertical caliper.
e Using the touchpad, position the second
vertical caliper at the end of the waveform.
f Press the
SET key to complete the trace and
to display the results.
g Save the calculation. See “To save a
calculation” on page 47.
Results appear at the bottom of the screen as well
as save to the patient report.