Advanced Physics for Brachytherapy 2018

Phantom correction

) ( ) ( , Q phant QwwD

phant p =

, wD

• Plastics fabricated for water equivalence in MV beams used as phantom material (solid water 457-Gamex, white water RW3-PTW, plastic water CIRS) • Williamson (1991) first noted the need for a p phant correction

Table from: Luxton, Med. Phys. 21(5), 631 (1994)