P11
Portable Digital Color Doppler Ultrasound System
7.3.2 Adjust DPI Sample Box
Follow the instructions below to adjust the sample box.
• Use the trackball to change the position of the sample box.
• Press the
SET
key. Use the trackball to change size of the sample box.
• Press the
SET
key again to re-adjust the position of the sample box.
7.3.3 Pulse Repetition Frequency
The Pulse Repetition Frequency sets the velocity range of the color flow display.
The range of the PRF depends on the probe and the application mode. Increasing
the PRF range also changes the velocity scale shown on color wedge.
Flip the
PRF
switch up/down to increase/decrease the PRF range.
Remarks:
• The current PRF value is display at the Color Image Info area (PRF).
•
The system automatically adjusts the Wall Filter setting upon changing
the PRF value.
7.3.4 Wall Filter
Wall Filter intends to eliminate the low frequency noise generated by movements
of blood vessel walls.
Flip the
FILTER
switch up/down to increase/decrease the Wall Filter value.
Remarks:
•
The current Wall Filter value is displayed at the Color Image Info area
(WF).
•
The Wall Filter is adjustable within a range which depends on the
current PRF value.
7.3.5 DPI Gain
Properly adjust the DPI gain to ensure that the color flow is continuous but no
color speckle is present.
Turn the
D GAIN
knob clockwise / counterclockwise to increase / decrease the
CDI gain.
Remarks:
•
The DPI gain value is displayed on the screen at the Color Image Info
area (GN).
•
It is possible to change the DPI Gain only when the DPI mode is active.
7-3
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