5-16 Image Optimization
Operation Adjust through the [Dyn Ra.] item in the soft menu.
Effects Increasing dynamic range will lead to higher sensitivity to low-power
signals, thus enhances the range of signals to display.
5.6 PW/CW Doppler Mode Optimization
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, iTouch and HPRF, are not available
in the CW mode.
5.6.1 PW / CW Mode Exam Protocol
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,
z The sampling status will be displayed in the image parameter area in the upper
left corner of the screen.
PW Sampling Line
Adjustment
SV
Angle
SVD
CW Sampling Line
Adjustment
Angle
CW Focus Depth
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> a
gai
n 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 left corner of the
screen displays the real-time parameter values as follows:
PW Parameter F G PRF WF SVD SV Angle
Meaning Frequency Gain PRF Wall Filter SV Position SV Size Angle
CW Parameter F G PRF WF SVD Angle
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