Image Optimization 5-15
Power Map
This feature indicates the display effect of Power image.
The maps in the Power mode image are grouped into two categories: Power
maps and Directional Power maps.
To select among the maps, turn the knob under [Map] on the image menu.
There are 8 kinds of maps provided: P0-P3 belong to Power mode maps,
while dP0-dP3 belong to Directional Power mode maps.
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
This function is to adjust the transformation of echo intensity into color signal.
Click the [Dynamic Range] item on the image menu to adjust the dynamic
range.
Increasing dynamic range will lead to higher sensitivity to low-power signals,
thus enhances the range of signals to display.
5.8 PW/CW Doppler Mode
PW (Pulsed Wave Doppler) mode or CW (Continuous Wave Doppler) mode is used to provide
blood flow velocity and direction utilizing a real-time spectral display. The horizontal axis
represents time, while the vertical axis represents Doppler frequency shift.
PW mode provides a function to examine flow at one specific site for its velocity, direction and
features; while CW mode proves to be much more sensitive to high velocity flow display. Thus,
a combination of both modes will contribute to a much more accurate analysis.
Adjustment items, such as SV, steer, Duplex, Triplex and HPRF, are not available in the CW
mode.
NOTE: Only phased probes support CW mode.
5.8.1 Basic Procedures for PW / CW Mode Exam
1. Select a high-quality image during B mode or B + Color (Power) mode scanning, and
adjust to place the area of interest in the center of the image.
2. Press <PW> to adjust the sampling line,
Click [CW] item on the PW image menu to enter CW mode.
The sampling status will be displayed in the image parameter area in the upper right
corner of the screen as follows:
PW Sampling Line
Adjustment
SV
Angle
SVD
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