Mindray DP-50 Exp Vet, Operator'S Manual

Page: 83 / 343

Image Optimization 5-15
Operations Rotate the <Gain/iTouch> knob clockwise to increase the gain, and
anticlockwise to decrease.
The adjusting range is 0-100.
Effects Increasing the gain will increase the flow signal presented as well as noise,
while the signals may be missing when the gain is adjusted too low.
Steer
Description The feature is used to adjust the ROI of color flow of different angles with
immobility of the linear probe.
Operations Adjust through the <Steer> key on control panel or [Steer] item on image
menu.
Effects This function is used to adjust the scan angle of linear probes, so as to change
the angle between the transmitting beam and flow direction.
Impacts Steer is valid only for linear probes.
Scale
Description This function is used to adjust the speed range of color 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.
The adjusting range varies by frequency, probe and depth; adjust according to
the actual situation.
Effects To provide a much clearer color flow image.
Use low PRF to observe low-velocity flows, and 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.
Baseline
Description Refers to the area where the velocity is zero in the scale. Adjust according to
the actual situation so as to get an optimum flow display.
Operations Press the <Baseline> key on the control panel and rotate the Multifunctional
Knob on the left to adjust.
Positive value means to increase the signals above the baseline, and negative
value means to increase the signals below the baseline.
Invert
Description To set the display mode of color flow and the color scale will be inverted when
the function is turned on.
Operations Turn on or off the function through the [Invert] item on the image menu.
Select “Auto Invert” in the “[Setup] → [System Preset] → [Image]”, then the
color bar can automatically invert when the color flow is steered to a certain
angle to accommodate operator’s habit of distinguishing flow direction.