Image Optimization 5-19
5.5.2 Power Mode Image Parameters
In Power mode scan, the image parameter area on the left side of the screen displays the real-time
parameter values as follows:
Meaning Frequency Color Gain Color Wall Filter Pulse Repetition Frequency PRF
During Power mode imaging, menus of image optimizing for B mode and Power mode are displayed on
the touch screen at the same time. You can switch between the 2 modes by tapping the mode tabs.
In Power mode, acoustic power is synchronous with that of B mode. Adjustment of the depth or zoom to
the B Mode image will lead to corresponding changes in Power mode image.
Because both are based on Doppler color imaging, the adjustments of Power mode are same with
these of Color mode’s. Hence, only the adjustments of Power mode are introduced.
5.5.3 Power Mode Image Optimization
Power Gain
Description
Refers to the overall sensitivity to flow signals, and this function is used to adjust the
gain in Power mode. The real-time gain value is displayed in the image parameter
area on the top of the screen.
Operation Rotate <C> knob clockwise to increase the gain, and anticlockwise to decrease.
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.
Color map
Description This feature indicates the display effect of power image. The maps in Power mode
image are grouped into two categories: Power maps and Directional Power maps.
Operation
Tap [Color Map] on the touch screen to complete the adjustment. The Power maps
provide information of blood flow, which are highly sensitive to the low-velocity flows.
The Directional Power maps provide information of flow direction.
Dynamic Range
Description This function is to adjust the transformation of echo intensity into color signal.
Operation Rotate the knob under [Dynamic Range] on the touch screen to adjust the
parameters.
Effects
Increasing dynamic range will lead to higher sensitivity to low-power signals, thus
enhances the range of signals to display.
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