Samsung SONOACE R7 Manual do Utilizador descarregar pdf (Página 178)

5-4

Operation Manual

 Doppler Signal Adjustment

X During velocity measurement, an error may occur depending on the cosine angle between the blood

ow and the ultrasound beam.

X For Doppler velocity measurements, the most accurate results can be ensured when the ultrasound

beam is aligned in parallel with the blood ow.

X If that is not possible, the angle between them should be adjusted by using the

Angle

option.

 Aliasing

X PW Spectral Doppler Mode uses a signal sampling technique to calculate the frequency (or velocity)

spectrum.

X Adjust the baseline or the velocity scale to minimize aliasing. A lower frequency probe can also be

used to reduce aliasing.

X Aliasing is dramatically reduced in CW Spectral Doppler Mode.

 Calculation Equation

X Some of the calculation equations used for clinical purposes originate from hypotheses and

approximation.

X All calculation equations are based on medical reports and articles.

 Human Error

X Human error may occur due to inappropriate use or lack of experience.

X This can be minimized through compliance with and thorough understanding of the manuals.

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Samsung SONOACE R7 Manual do Utilizador Página 178