Samsung SONOACE R3 Manual do Utilizador Página 126

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Operation Manual
5-4
Doppler Signal Adjustment
During velocity measurement, an error may occur depending on the cosine angle between the
blood ow and the ultrasound beam.
For Doppler velocity measurements, the most accurate results can be ensured when the ultrasound
beam is aligned in parallel with the blood ow.
If that is not possible, the angle between them should be adjusted by using the Angle option.
Aliasing
PW Spectral Doppler Mode uses a signal sampling technique to calculate the frequency (or velocity)
spectrum.
Adjust the baseline or the velocity scale to minimize aliasing. A lower frequency probe can also be
used to reduce aliasing.
Calculation Equation
Some of the calculation equations used for clinical purposes originate from hypotheses and approxi-
mation.
All calculation equations are based on medical reports and articles.
Human Error
Human error may occur due to inappropriate use or lack of experience.
This can be minimized through compliance with and thorough understanding of the manuals.
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