Samsung PT60A User Manual Page 124

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User Manual
Ultrasound Velocity
X
The average velocity of ultrasound used for measurement is usually 1,540m/s.
X
The velocity of ultrasound may vary depending on the cell type.
X
The possible range of error is approximately 2-5% depending on the structure of cells (about
2% for typical cells and about 5% for fatty cells).
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.
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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