Hemodynamics
of
Large Arteries
141
electromagnetically measured flow.
Li et
al.
(1981)
measured the
propagation constant in arteries and found that the measured attenuation
coefficients and phase velocities differed greatly from those predicted by
linear theories.
To
explain the observed discrepancies, they evaluated
and compared the nonlinear and linear theories for the femoral artery.
For the nonlinear theory, the complete solution of the Navier-Stokes
equation, the geometric taper, and pressure-dependent wall compliance
were
incorporated.
Although
varied
nonlinearities
have
been
incorporated in some nonlinear theories,
in
general vascular branching
has not been included. Its effect
is
significant in pulse transmission.
This will be discussed in the following chapter.
