Dose 2016

20

Beam quality variations off axis

6 MV

10 MV

1.14

1.14

1.14

1.14

Calculation FF Calculation FFF

Calculation FF Calculation FFF

Calculation FF Calculation FFF

Calculation FF Calculation FFF

1.12

1.12

1.12

1.12

Georg et al (2010) FF Georg et al (2010) FFF Tailor et al (1998)

Georg et al (2010) FF Georg et al (2010) FFF Tailor et al (1998)

Georg et al (2010) FF Georg et al (2010) FFF Tailor et al (1998)

Georg et al (2010) FF Georg et al (2010) FFF Tailor et al (1998)

1.1

1.1

1.1

1.1

1.08 HVL/HVL( Θ ) 1.06

1.08 HVL/HVL( Θ ) 1.06

1.08 HVL/HVL( Θ ) 1.06

1.08 HVL/HVL( Θ ) 1.06

1.04

1.04

1.04

1.04

1.02

1.02

1.02

1.02

1

1

1

1

0

2

4

6

8

10

0

2

4

6

8

10

0

2

4

6

8

10

0

2

4

6

8

10

Off−axis angle ( Θ ) (a)

Off−axis angle ( Θ ) (b)

Off−axis angle ( Θ ) (a)

Off−axis angle ( Θ ) (b)

Courtesy Mårten Dalaryd

Utrecht 2016