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BT-GYN Teaching Course
D. Berger
Mathematical Description / Repair Function
External beam radiotherapy and HDR brachytherapy :
no repair during irradiation (min)
repair function
g = 1
LDR, MDR brachytherapy :
repair during irradiation (hours - days) is significant
(
)
−
− =
−
t
e
t
MDR
LDR g
t
µ
µ
µ
1 12
,
21
T
2ln
=µ
µ
… repair rate
T
1/2
… half time for repair
t … irradiation time
2
T
1/2
4
6
8 Time [h]
. . .
2
T
1/2
4
6
8 Time [h]