2017_SBRT_Course Book

Imaging for target and OAR definition

Dahele IJROBP 2011

CT

MRI T2

MRI T1

CT imaging: • Slice thickness 1- 2mm MRI imaging: • T1 with and w/o Gadolinium contrast • T2 • Slice thickness ≤ 3mm or volumetric image acquisition

ESTRO SBRT 2017 - Matthias Guckenberger

07.09.17

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Average differences between 5 institutions (mm) X-axis Y-axis Z-axis CT & MRI image registration

1.1

0.8

1.3

Average

Range between 5 institutions (mm)

2.4

1.8

3.0

Average

Toussaint Radiat Oncol 2016

• Rather large inter-observer variability Ø Automatic image registration between CT and MRI images not reliable Ø Manual adjustment / correction of image registration

ESTRO SBRT 2017 - Matthias Guckenberger

07.09.17

22

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