5-18 Image Optimization
5.5
Power Mode Image Optimization
Power mode provides a non-directionally display of blood flow in the form of intensity as opposed to flow
velocity.
DirPower (Directional Power Mode) provides the additional information of flow direction towards or away
from the probe.
5.5.1
Power Mode Protocol
1. Select a premium image during B mode or B+ Color scan, and adjust to place the area of interest in
the center of the image.
2. Press <PD> to enter B+Power mode. Use the trackball and <Set> to change position and size of the
Region of Interest (ROI).
3. Adjust the image parameters to obtain optimized images.
4. Perform other operations (e.g. measurement and calculation) if necessary.
5.5.2
Power Mode Image Parameters
In Power mode scan, the image parameter area on the right side of the screen displays the real-time
parameter values as follows:
Items
F
G
WF
PRF
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 touchpad 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.
The adjusting range is 0-100 dB in increments of 2 dB.
Gray Map
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.
Tint 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.
