Fig. 4

a Patient with meningioma in the right frontal lobe. Axial MR and simultaneous PET/MR images through the lesion: T2-weighted MRI, ⁶⁸Ga-DOTATOC PET. b A 42-year-old man with a neurocytoma. PET/MR images were acquired simultaneously following injections of ¹¹C-methionine (left). Simultaneously acquired chemical shift imaging MRS provides a map of the choline to N-acetyl-aspartate ratio (centre). Simultaneous diffusion tensor imaging (DTI) shows the clear relationship with the adjacent optic radiation. Cases courtesy of Drs. Boss, Bisdas and Schwenzer (UH Tübingen, Department of Radiology)