Image Optimization 5-17
Meaning Frequency Gain PRF Wall Filter SV Position Angle
îš„ During PW/CW mode imaging, menus of image optimizing for B mode and PW/CW
mode are displayed on the soft menu at the same time; if there is also Color mode
(Power mode) working, menus of certain modes will also be displayed synchronously,
and you can switch by clicking the left/right arrow.
îš„ When you adjust the depth of the B mode image, related changes will occur in
PW/CW mode image as well.
îš„ Most of the parameters are the same for the PW mode and CW mode, so
parameters of the both are combined together to be introduced here.
Only phased probes support CW mode.
5.6.3 PW/CW Doppler Mode Optimization
Gain
Description This function is intended to adjust the gain of spectrum map. The real-time
gain value is displayed in the image parameter area in the upper left
corner of the screen.
Operation Rotate the <PW> knob clockwise to increase the gain, and anticlockwise
to decrease.
Or adjust it in the image parameter area.
The adjusting range is 0-100.
Effects Increasing the gain will brighten the image and you can see more received
signals. However, noise may also be increased.
Frequency
Description Refers to the operating frequency in PW mode of the probe, the real-time
value of which is displayed in the image parameter area in the upper left
corner of the screen.
Operation Select the frequency value through the [Frequency] item in the soft menu.
Or adjust it in the image parameter area.
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 worse the axial resolution, and the better the
force of penetration.
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 will be
displayed in the image parameter area in the upper left corner of the
screen.
Operation Adjust the speed range through the [Scale] item in the soft menu.
The adjusting range varies by frequency, probe and depth; adjust
according to the actual situation.
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