5-18 Image Optimization
5.5
Power Mode Image Optimization
Power mode provides a non-directional display of the blood flow in terms of intensity as
opposed to flow velocity.
DirPower (Directional Power mode) provides additional information of the flow direction
toward or away from the probe.
5.5.1
Basic Procedures for Power Mode Imaging
1. Select a high-quality image during B mode or B + Color scanning, and adjust to
position the area of interest in the center of the image.
2. Press <Power> to enter B + Power mode. Roll the trackball to change the position of
the Region of Interest (ROI) and press the <Set> key to set. Roll the trackball to
change the size and position of the ROI.
3. Adjust the image parameters during B + Power mode scanning 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 scanning, the image parameter area in the top-right corner of the
screen displays the real-time parameter values as follows:
Parameter F
G
PRF
WF
Meaning
Frequency Power Gain
Pulse Repetition
Frequency (PRF)
Power Wall Filter
During Power mode imaging, the image optimizing menus for B mode and Power
mode are displayed on the touch screen at the same time. You can switch between
the 2 modes by clicking the mode tabs.
In Power mode, the acoustic power is synchronous with that of B mode. Adjustment
of the depth to the B mode image will lead to corresponding changes in Power mode
image.
Parameters consistent with those in Color mode and B mode are not to be introduced.
See the relevant Color mode and B mode sections, while special items of the Power
mode are introduced in the following.
5.5.3
Power Mode Image Optimization
Power Gain
Description
Refers to the overall sensitivity to flow signals. This function is used to
adjust the gain in Power mode.
The real-time gain value is displayed in the image parameter area in the
top-right corner of the screen.
Operations
Rotate the <Color> knob clockwise to increase the gain, and counter-
clockwise to decrease it.
The adjusting range is 0-100 in increments of 2.
