1,721,093 research outputs found
Application of a new aliasing-defeating method to pulsed Doppler flow imaging systems
No full textPlenum Press, New Yor
On the use of Doppler bandwidth for more accurate blood-flow estimation
No full textIf the range cell or measurement volume of a
Doppler flow measurement system is small enough so
that the flow through it is of uniform velocity, the
resulting Doppler spectrum will be relatively narrow,
with a mean frequency related to the velocity in the
range cell by the Doppler equation. If the range cell is
now enlarged so as to encompass a range of velocities.
the resulting Doppler spectrum will broaden correspondingly. It is shown theoretically and confirmed by experiment, that this broadening of the Doppler spectrum which accompanies an increase in length of the range cell, does not affect the maximum
frequency of the spectrum which remains constant,
being a function only of the maximum velocity passing
through the range cell. Applications of this phenomenon to blood flow estimation in narrow vessels is discussed
Effects of the simultaneous presence of geometrical and velocity broadening on the pulsed Doppler spectrum
No full textDependence of Doppler line-flow spectrum on range and beam-to-flow angles: an experimental approach
No full text
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