2017_IGRT course book

Glioma delineation variation (Beijing 2008)

SD (mm)

SD (mm) outliers removed

Margin (mm)

Homework 3.6

2.3

5.8

Groups

1.3

1.3

3.2

Validation 2.6

2.3

5.8

•Delineation uncertainty is a systematic error that should be incorporated in the margin •Consistency is imperative to gather clinical evidence