IGRT 2016 Madrid

Delineation effect on dose

Delineation effect on dose

Dose to the target and distance from the OAR

Observer and technique effect on the irradiated volume Mean Planning Target Volume: 36.3 cm3

60

50

3D Conformal plans ( ▲ )

Observer 1 Observer 2 Mean

40

IMRT

135 cm3

115 cm3 195 cm3 155 cm3

125 cm3 218 cm3

30

3D Conformal 241 cm3

20

Mean

188 cm3

prescribed dose

10

vol% receiving < 95% of the

Mean observer effect: Mean technique effect:

33 cm3 93 cm3

0

0

0.5

1

1.5

2

2.5

3

3.5

4

minimum distance between the boost PTV and the chiasm (cm)

IMRT plans ( ■ )

•Rasch et al IJROBP 2002

•Rasch et al IJROBP 2002

Observer variation in the neck

Prevertebral Level 1-2

18 observers – MCA, AvL, VUMC, ARTI, RISO, MST, MCH, UMCG, RIF, MAASTRO, UMCN, DDHK, UMCU, Leuven, Middelheim, 1 patient Delineation according to guidelines as published by Gregoire et al – R&O 2003

Gregoire et al 2003 R&O

2 top

2 mid