IMRT

ESTRO Booklets on QA for NON-IMRT beams

Region

Homogenous, simple geometry

More complex geometries

Complex geometry

δ 1

Central beam axis data – high dose, low dose gradient 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 Outside beam edges – low dose, low dose gradient Radiological width – high dose, high dose gradient. Beam fringe – high dose, high dose gradient

2%

3%

4%

δ 2

*

2 mm or 10%

3 mm or 15%

3 mm or 15%

δ 3

3%

3%

4%

4%-4mm

5%-5mm

δ 4

**

3%-3mm

RW 50 ***

2 mm or 1%

2 mm or 1%

2 mm or 1%

δ 50-90

2 mm

3 mm

3 mm