Physics Bucharest 2017

Volume definition: Organs at risk (OAR)

• OAR

• Normal tissue whose radiation sensitivity may significantly influence treatment planning and/or prescribed dose

• Organisation/Functional Subunit Concept • Serial • Parallel • Serial-Parallel

Schultheiss TE et al., Models in radiotherapy: volume effects. Med Phys 1983, 10(4):410-415. Withers HR et al., Treatment volume and tissue tolerance. Int J Radiat Oncol Biol Phys 1988, 14(4):751-759.