Biomedical Engineering Reference
In-Depth Information
1
E
= 0.5
E
=
0.25
a
v
TT
−
−
L
L
a
v
TT
0
N =
0.5,
n =
0
E
=
0
E
=
0.5
0.5
E
= 0.25
v
v
TT
TT
−
−
L
a
v
E
=
0
0
L
0
0
0.5
1
x
/
L
(a)
1
a
v
E
=
0.5
TT
−
−
L
L
E
=
0.25
a
v
TT
0
E
=
0.5
E
=
0
0.5
E
=
0.25
v
v
TT
TT
−
−
E
= 0
L
a
v
0
L
N =
1.0,
n =
0
0
0
0.5
1
x
/
L
(b)
FIGURE 1.7
Arterial and venous blood temperature profiles along the vessel axes for the
case of
n
= 0 (a)
N
=0
.
5,
n
= 0 and (b)
N
=1
.
0,
n
=0.
The total heat transfer from the artery to the vein is plotted against the
exponent
n
for various sets of
N
and
E
values in Figure 1.9. The total heat
transfer decreases as increasing
n
(i.e., worsening the blood circulation), while
it increases with
E
(i.e., increasing the perfusion rate).
1.7 Application of Bioheat Equation to Cryoablation
Therapy
1.7.1 Related Work
Cryotherapy is often preferred to more traditional kinds of surgical therapy
because of its minimal pain, scarring, and cost. The therapy has been gaining
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