5-28 Image Optimization
HPRF
Description
HPRF mode is used when detected velocities exceed the processing
capabilities of the currently selected PW Doppler scale or when the
selected anatomical site is too deep for the selected PW Doppler scale.
Operation Turn on or off the function through the [HPRF] item in the soft menu or
menu.
Effects HPRF enhances the range of detecting high-velocity flow.
Baseline
Description
Refers to the area where the velocity is zero in the spectrum.
Operation Adjust through the [Baseline] item in the soft menu or menu.
Effects Adjust baseline according to the actual situation to change the range of
flow velocity to optimize the image.
Positive value means to enhance the signals above the baseline, and
negative value means to enhance the signals below the baseline.
Impacts The function is available in real-time imaging, freeze or cine review status.
Angle
Description
This function is used to adjust the angle between Doppler vector and flow
to make the velocity more accurate.
The real-time adjusting angle value is displayed on the right part of the
spectrum map.
Operation Adjust through the [Angle] item in the soft menu or menu.
The adjustable angle range is -80~80° in increments of 1°.
Impacts The function is available in real-time imaging, freeze or cine review status.
Quick Angle
Description
To adjust the angle faster in increments of 60°, an d the real-time value of
which is displayed on the right part of the spectrum map.
Operation Adjust through the [Quick Angle] item in the soft menu or menu.
There are 3 angles for quickly adjustment: -60°, 0° , and 60°.
Impacts The function is available in real-time imaging, freeze or cine review status.
Dynamic Range
Description
The dynamic range conveys the information being transformed from echo
intensity to gray scale.
Operation Adjust through the [Dyn Ra.] item in the soft menu or menu.
The adjusting range is 24-72dB in increments of 2dB.
Effects The more the dynamic range, the more specific the information, and the
lower the contrast with more noise.
Impacts The function is available in real-time imaging, freeze or cine review status.
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