Samsung SONOACE R5 Manual do Utilizador descarregar pdf (Página 128)

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5-4

User Manual

Ultrasound Velocity

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The velocity of ultrasound used during measurement is usually 1,540 m/s on average.

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The velocity of ultrasound may vary depending on the cell type.

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The possible range of error is between approximately 2-5% depending on the structure of cells

(about 2% for typical cells and about 5% for fatty cells).

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

approximation.

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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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