Biomedical Engineering Reference
In-Depth Information
Fig. 2.32.
The experimental setup to capture an echogram of capsules inside a
phantom
Fig. 2.33.
An echogram of a cross-section of a phantom
coe
cients
c
and
d
using an approximate logarithmic function as follows [46]:
B
=
c
ln
x
+
d.
(2.2)
Figure 2.34 is a result of brightness variation measurement. The measured
variation in the density of the capsules is classified and superimposed on the
original gray-scale echogram using color, to assist in the measurement of the
effect of ultrasound emission. By using this method, we could easily evaluate
not only the collapse phenomena of microcapsules, but also the optimum
