Radiotherapy Planning Using Fluciclovine PET in Patients With Newly Diagnosed Glioblastoma

PET+MRI Based There is no GTV\_5400. The GTV\_6000 will be defined as the surgical cavity inclusive of any remaining tumor enhancement and the hypermetabolic volume. CTV\_5400 will include the GTV\_6000 plus a margin of 1.0 cm which may be reduced around natural barriers to tumor growth such as the skull, ventricles, falx, etc. CTV\_5400 must also include the entirety of the GTV\_6000. There is no CTV\_6000. PTV\_5400 is the CTV\_5400 plus a geometric 3 mm expansion in all dimensions; PTV\_6000 is GTV\_6000 plus a geometric 3 mm expansion in all dimensions. PTV may extend beyond bony margins and the skin surface. The PTV\_5400 must contain the PTV\_6000. In the setting of multi-focal disease, the primary target volumes will be defined as above, but for satellite lesions, the GTV\_6000 will be defined as any tumor enhancement and hypermetabolic volume. There will be no CTV\_6000. PTV\_6000 will be defined as GTV\_6000 plus a geometric 3 mm expansion in all dimensions.