5-22 Image Optimization
5.6 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.
CW imaging is an option.
Adjustment items, such as SV, steer, Duplex, Triplex, iTouch and HPRF, are not available in the
CW mode.
5.6.1 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>/<CW> to adjust the sampling line,
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
CW Sampling Line
Adjustment
3. Set the position of the sample line by moving the trackball left and right, and set the SVD by
moving the trackball up and down, adjust the angle and SV size according to the actual
situation.
4. Press <PW>/ <CW> or <Update> again to enter PW/CW mode and perform the examination.
You can also adjust the SV size, angle and depth in real-time scanning.
5. Adjust the image parameters during PW/CW mode scanning to obtain optimized image.
6. Perform other operations (e.g. measurement and calculation) if necessary.
5.6.2 PW/CW Mode Image Parameters
In PW/CW mode scanning, the image parameter area in the upper right corner of the screen
displays the real-time parameter values as follows:
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