Fig. 3.
Probability for inclusion of the complete FET-PET–positive volume as a function of distance from the GTV(MR), for all patients (left) and split for the groups of patients with grade III or IV disease (right). Most gliomas have some part of the PET-positive region outside the GTV(MR), but with a 20-mm margin from the GTV(MR), ∼90% of glioma PET-positive regions will be encompassed.