5-28 Image Optimization
5. Tap [WSS] again and repeat step 4 to add more stress points.
Press <Update> to switch the stress points.
Press <Set> to select WSS points, then move the track ball to adjust the position and direction of
WSS point.
6. Press <Save> to save the cine file.
Wall shear stress indices
Wall shear stress indices change linearly with wall shear stress. The higher wall shear stress, the
higher the indices value.
Tap [Blood Viscosity] to change Wall shear stress indices.
Delete wall shear stress point
After 3 stress points are added, you can delete the point by pressing <Update> to activate it and
press <Clear>.
5.7
PW/CW Mode Optimization
PW (Pulsed Wave Doppler) mode or CW (Continuous Wave Doppler) mode is used to provide blood flow
velocity and direction utilizing a real-time spectral display. The horizontal axis represents time, while the
vertical axis represents Doppler frequency shift.
PW mode provides a function to examine flow at one specific site for its velocity, direction and features;
while CW mode proves to be much more sensitive to high velocity flow display. Thus, a combination of
both modes will contribute to a much more accurate analysis.
CW module is optional.