Biomedical Engineering Reference
In-Depth Information
(a)
(b)
FIGURE 6.10 (a) Unoptimized and (b) optimized ultrasound phase array apertures for hyperthermia in the prostate. (After R. J. McGough,
M. L. Kessler, E. S. Ebbini, and C. A. Cain, IEEE Trans. Ultrason. Ferroelect. Freq. Contr. , 43, 6, 1996.)
Weight=1024
3
2.5
Weight=1
2
1.5
1
Weight= 1024
0.5
Weight=1024
50
1
2
3
Pareto front individuals
Neck (right)
Neck (left)
Neck (right and left)
FIGURE 7.6 Pareto front of optimized antenna settings for hyperthermia treatment of the head-and-neck area. Each point corresponds to an
optimized antenna setting, and which one is selected is decided based on the weighting of the different goals (heat the tumor, avoid exposing the
left side of the neck, avoid exposing the right side of the neck). Changing the weighting corresponds to gliding along the Pareto front and translates
into shifting the energy deposition.
Coronal
Sagittal
Axial
SAR 85 -SAR 75
SAR 95 -SAR 75
SAR 85 -SAR 75
SAR 95 -SAR 75
SAR 85 -SAR 75
SAR 95 -SAR 75
FIGURE 8.15 Comparison of the SAR distributions of 75 MHz to that of 85 and 95 MHz in the same patient. Changes in local SAR by >5 W/kg,
increase in red and decrease in blue are presented for an average patient with locally advanced cervical cancer.
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