2017_IGRT course book

CNS: single fraction IGRT for brain metastasis

all in cm

systematic errors

randomerrors squared

squared

delineation organ motion setup error CBCT accuracy

0.13

0.0169

0

0

0

0

0.03 0.02

0.0009

0

0.0004

0

intrafraction motion

0.02

0.0004

total error

0.13

0.02

0.02

0.0004

times 2.5

times 0.7

error margin

0.34

0.01

total error margin

0.35

•Tightest margin achievable in EBRT ever due to very clear outline on MRI