IGRT 2016 Madrid

Pulmonary SBRT

Do we need patient immobilization?

LR (mm)

SI (mm)

AP (mm)

Immobilization

Yes No Yes No

1.3 1.2 1.4 1.3

1.1 1.2 1.4 1.5

1.3 1.8 1.6 1.8

Σ σ

Guckenberger 2007 Sonke 2009

Intra-fractional changes of the tumor position seen in CB-CT images after treatment Assuming gross motion in 1% of the fractions:  Limited relevance in conventionally fractionation (blurring)