2017_IGRT course book

Empty bladder

Margins respective of filling

CTV  PTV

Small

Intermediate

Large PTV

(cm)

PTV

PTV

If difference CTV1 and CTV3 is > 50 cc:

If difference CTV1 and CTV3 is < 50 cc:

Based on CT30

CT0

Anterior

0.5

1.5

1.5

2.0

Posterior

0.5

1.0

1.0

1.2

Lateral

0.5

0.5

0.5

0.75

Superior

0.5

1.5

1.5

2.5

Inferior

0.5

0.5

0.5

0.75