SBRT 2016

Brain SBRT: end-to-end accuracy at CZE • What is the total current accuracy? • Is the current margin appropriate?

GTV = 5 cm 3 PTV 1

= GTV + 3 mm=11.5 cm 3

PTV 2 =GTV + 2 mm=9.2 cm 3 With 1 mm smaller margin  20% reduction in irradiated brain volume

Blonigen IJROBP 77(4) 2010 p996