Biomedical Engineering Reference
In-Depth Information
Heating object
Auxiliary electrode
Ferrite core
A
C
S
N
S
N
B
D
Auxiliary electrode
(a)
(b)
FIGURE 4.21
(
a
) Heating principle. (
b
) Thermographic view of phantom after
heating.
in Figure 4.21
a
. The actual auxiliary electrode is made of silicon rubber con-
taining silver powder to make it conducting, while it can circulate cooling
water inside the electrode, as shown in Figure 4.22. Figure 4.23 shows a ther-
mographic view of an experimental result after heating an elliptic shaped
cylindrical phantom. The thick black area at the center of the figure is that of
highest temperature.
Other examples of how to control the eddy current, are the applicator
systems developed for breast hyperthermia. Figure 4.24 shows a system with
a pair of ferrite cores. The magnetic field couples mainly between a pair of
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