Framebased-Frameless_DV_2017_final.pptx

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/ ESTRO SBRT 2017 - Matthias Guckenberger 27
No consensus on planning organ at risk “spinal cord”:
• Spinal cord
• Spinal cord + 1-2mm
• Thecal sack (cord + 0.5 – 1.5mm)
• Spinal canal
Definition of the OAR spinal cord
Conventional CT CT Myelography T2 weigted MRI
Use a planning OARs with some margin
07.09.17
/ ESTRO SBRT 2017 - Matthias Guckenberger 28
Dose and fractionation
Lovelock IJROBP 2009 Yamada IJROBP 2008
1 x 15.1Gy 1 x 24Gy
ØDose effect relationship in single fraction SRS
07.09.17