Mindray Z60W - Page 80

5-18 Image Optimization
PW Steer
Description
This function provides adjustment on angles for sampling line.
Operations
Adjust through the <Steer> key on control panel or [Steer] item on image
menu.
Effects
This feature is used to steer the direction of the beam so as to change the
angle between the beam and flow direction with immobility of the linear probe.
Values of steer angles vary by probe.
Steer is available only for linear probes
Invert
Description
This function is used to set the display manner of spectrum.
Operations
Turn on or off the function through the [Invert] item on the image menu.
Select “Auto Invert” in the “[Setup] → [System Preset] → [Image]”, thus the
spectrum can automatically invert when the color flow is steered to a certain
angle to accommodate operator’s habit of distinguishing flow direction.
Scale
Description
This function is used to adjust the speed range of flow, which is adjusted
through PRF in the system.
The real-time PRF value is displayed in the image parameter area in the
upper right corner of the screen.
Operations
Press the <Scale> key on the control panel and rotate the Multifunctional
Knob on the left to adjust.
Effects
To provide a much clearer color flow image.
Use low PRF to observe low-velocity flows, and use high PRF to observe
high-velocity flows.
Impacts
Aliasing may occur if low velocity scale is used and high velocities are
encountered.
Low velocities may not be identified when a high velocity scale is used.
Wall Filter
Description
It filters out low-velocity signals to provide effective information, and this
function is used to adjust the filtered frequency. The real-time value is
displayed in the image parameter area in the upper right corner of the screen.
Operations
Select through the [WF] item on the image menu.
There are 0-6 levels of wall filter function provided.
Impacts
Signals of low-velocity flow may be missing.
T/F Res
Description
This function is used to adjust for a balance between time resolution and
spatial resolution.
Operations
Adjust through the [T/F Res] item on the image menu.
There are 0-4 levels of T/F Res values available.