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Mindray DP-20 - Page 74

Mindray DP-20
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5-12 Image Optimization
Operation
Select the frequency value through the [Frequency] item in the image menu.
Values of frequency vary depending upon the probe types.
Select the frequency according to the detection depth and current tissue
characteristics.
Effects
The higher the frequency the better the near field resolution but the worse the
force of penetration.
Harmonic imaging enhances near field resolution and reduces low-frequency
and large amplitude noise, so as to improve small parts imaging.
Scale
Description
This function is used to adjust the speed range of the 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
Click the [Scale] on the image menu to adjust.
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.
iTouch
Description
To optimize image parameters as per the current tissue characteristics for a
better image effect.
Operations
Press <Gain/ iTouch> on the control panel to turn the function on.
Invert
Description
This function is used to set how the spectrum is displayed.
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.
Speed
Description
This function is used to set the scanning speed of PW mode imaging.
Operations
Click the [Speed] item on the image menu.
There are 6 levels of scan speed available: the smaller the value the faster the
speed.
Effects
Changing the speed makes it easier to identify the cardiac cycles and to
detect more details.

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