Brain 17 Vienna

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Page Background

Areas at Risk

isocentre

tumour

Spinal canal

rotation of collimator

according to divergence

angle of upper spinal field

SSD : source to skin distance

SSD

100 cm

SSD

100 cm

1. Leptomeningeal space

(subclinical disease / „low risk“)

2. Posterior fossa

(subclinical disease

„high risk“ ?)

3. Tumour site

(residual tumour

R1-2)

Mmmoving junction

boostfield to

posterior fossa