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