Advanced Physics for Brachytherapy 2018

Effective dose in EQD

(normalized to

2Gy

2Gy fx)

D

 ( x + a / b )

( xGy )

EQD

=

2 Gy

(2 + a / b )

a / b = 10( tumour ) a / b = 3( OAR ) d = 1.8 Gy n = 25

EBRT:

45

 (1.8 + 10)

(1.8 Gy )

EQD

= 44.3 Gy

=

tumour

2 Gy

(2 + 10)

45

 (1.8 + 3)

(1.8 Gy )

EQD

= 43.2 Gy

=

OAR

2 Gy

(2 + 3)