GE Vivid S60N, Basic Service Manual

Page: 174 / 478

D
IRECTION
FR091521, R
EVISION
1 V
IVID
S60N/V
IVID
S70N B
ASIC
S
ERVICE
M
ANUAL
4-28 Section 4-3 - Functional Checks
P R E L I M I N A R Y
4-3-6 PW/CW Doppler Mode Checks
4-3-6-1 Introduction
PW and CW Doppler modes are used to measure velocity (most often in blood).
Doppler mode can be done with a special pencil probe or with an ordinary probe. By using an ordinary
probe, you can first bring up a 2D picture for navigation purpose and then add PW/CW Doppler.
4-3-6-2 PW and CW Doppler Overview
Figure 4-20 PW/CW Doppler Mode Screen
1. Sample volume (PW only)
2. Angle correction marker
3. Velocity
scale
4. Low velocity reject
5. Nyquist
velocity
6. Doppler baseline
7. Frequency scale (configurable, see Page 4-30 )
8. Parameter window
Note : the sweep speed information displayed in the bottom right corner of the image represents the user
selected sweep speed and should be used only as a reference to confirm that the image was acquired at the
selected sweep speed. It is not to be used for measurements or analysis. This is not an absolute value, but
simply a reference number. Users performing studies using standardized protocols may find this sweep
speed information useful for reading studies from other institutions.