Advanced Physics for Brachytherapy 2018

Expected interfraction variations for cervix BT

Target should remain fixed relative to applicator

Radiother Oncol 107

Sigmoid

Rectum: may slightly change in location and fill with gas Bladder : use of bladder filling protocols

GTV

Rectum

Bladder

Sigmoid: often changes its location

0.1cc

1cc

Hellebust et al. R&O 60, 2002 Lang et al. R&O 107, 2013

2cc

Kirisits et al. R&O 2006 Nesvacil et al. R&O 2013 Tanderup et al. R&O 107, 2013 (and references therein)

ICRU 38 Ref. Points