Dose Course 2018_Flipping book

2D detectors [EPID]

4. Back-project to dose grid from transit images

❑ Measure open and transit EPID dose image

❑ Estimate and subtract EPID and patient/phantom scatter

❑ Back-project primary dose to multiple planes to form dose grid using CT data

dose calculation algorithm

❑ Total dose = primary (based on transmission)+ patient scatter

EPID

Louwe

Med Phys (30), 2003 Med. Phys. (33), 2006 Med. Phys.(36), 2009

Wendling

Olaciregui-Ruiz Phys. Med.Biol. (58), 2013 Ian M Hanson Phys. Med.Biol. (59), 2014