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Dosimetric Kernel
BRT
BRT
0
2 4 6 8 10 12 14 16
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
Ir-192
Yb-169
100 keV
80 keV
60 keV
50 keV
40 keV
30 keV
20 keV
Radial Dose Fucntion g(r)
Radial Distance (cm)
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
100 keV
150 keV
200 keV
300 keV
400 keV
667 keV
20 keV
25 keV
30 keV
40 keV
50 keV
60 keV
70 keV
80 keV
90 keV
Dose Rate Normalized to 1.0 cm
Radial Distance (cm)
Modern Radiation Therapy
1/r
2
= 0.007
➔
0.7%
BRT
versus
ERT Similarities and Differences