Mindray DC-80A, Руководство оператора

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5-16 Image Optimization
Scale
Description This function is used to adjust the speed range of the color flow, which is adjusted
using the PRF in the system. The real-time PRF value is displayed in the image
parameter area in the top-right corner of the screen.
Operations
Rotate the knob under [Scale] on the touch screen or the mapping-menu item on the
touch screen.
The adjusting range varies according to the frequency, probe and depth. Adjust
according to the actual situation.
Effects Provides a much clearer color flow image.
Use a low PRF to observe low-velocity flows, and a high PRF to observe high-velocity
flows.
Impacts
Aliasing may occur if a 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
Rotate the knob under [Baseline] on the touch screen or the mapping-menu item on
the touch screen.
A positive value means increase the signals above the baseline, and a negative value
means increase the signals below the baseline.
Invert
Description To set the display mode of the color flow. The color scale will be inverted when the
function is turned on.
Operations
Turn the function on or off using the [Invert] item or the mapping-menu item on the
touch screen.
Select “Auto Invert” in “[Setup] (F10)
→
[System]
→
[Image]”, so the color bar can
automatically invert when the color flow is steered to a certain angle to accommodate
the operator’s desire to distinguish the flow direction.
Auto invert function is available only for linear probes.
Color Map
Description This function is a combination of several image parameters, which indicates the
display effect of the color image.
Operations
Rotate the knob under the [Color Map] item or the mapping-menu item on the touch
screen to select from among the maps.
The system provides 21 different maps for selection. The V group provides 11 ordinary
maps and the VV group provides 10 2D maps.