Advanced Physics for Brachytherapy 2018

TG-43 2D Formalism

G r

( , ) q

g r F r

( ) ( , ) q

D r

S = 

( , ) q

K

L

G r

0 0 ( , ) q

dose rate to water at point P(r, q)

( , ) D r q

S

air kerma strength

K

dose rate constant



( r , q )

geometry function ( line-source approximation )

G

L

g

( r )

radial dose function

L

F ( r , q )

2D anisotropy function

Rivard, et al., Med. Phys. 31, 633-674 (2004)