2017_IGRT course book

Pulmonary SBRT

Do we need patient immobilization?

LR (mm)

SI (mm)

AP (mm)

Immobilization

Yes

1.3

1.1

1.3

Σ

No

1.2

1.2

1.8

Yes

1.4

1.4

1.6

σ

No

1.3

1.5

1.8

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)