ESTRO course on Image Guided Radiotherapy in Clinical Practice 2018

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