IMRT 2018

ESTRO Booklets on QA for NON-IMRT beams

Region

Homogenous, simple geometry

More complex geometries

Complex geometry

δ

Central beam axis data – high dose, low dose gradient

2%

3%

4%

1

δ

*

Build-up region of central axis beam, penumbra region of the profiles - high dose, high dose gradient Outside central beam axis region - high dose, low dose gradient

2 mm or 10%

3 mm or 15%

3 mm or 15%

2

δ

3%

3%

4%

3

4%-4mm

5%-5mm

δ

**

Outside beam edges – low dose, low dose gradient

3%-3mm

4

RW ***

Radiological – high dose, high dose gradient. width

2 mm or 1% 2 mm or 1%

2 mm or 1%

50

δ

Beam fringe

– high

2 mm

3 mm

3 mm

50-90

dose,

high dose

gradient