F18-FET PET in pediatric brain tumors: integrative analysis of image derived parameters and clinico-pathological data.

Background: F18-FET PET has an established diagnostic role in adult brain gliomas. In this study we analyzed image derived static and dynamic parameters with available conventional MRI, histological, clinical and follow-up data in assessment of pediatric brain tumor patients at different stages of the disease.

Methods: Forty-four pediatric patients with median age 7 years, diagnosed with brain tumors and underwent forty-seven 18F-FET PET scans either initially (20 scans) or post-therapy (27 scans) were enrolled.

Radiosynthesis and modified quality control of O-(2-[F]fluoroethyl)-L-tyrosine ([F]FET) for brain tumor imaging.

O-(2-[F]fluoroethyl)-L-tyrosine ([F]FET) is the most promising radio-labeled amino acid tracer for brain tumor imaging due to the limitation of 2-deoxy-2-[F]fluoro-D-glucose ([F]FDG) and L-methyl-[C]methionine (C-MET). However, it has some limitations in radiosynthesis and related quality control that make it less frequently used in many PET centers, in this study, we report a new modification of [F]FET production using a commercially available fully automated GRP SCINTOMICS module overcoming some of the existing limitations along with a suggestion of a simplified quality control procedure with special focus placed on enantiomeric and radiochemical purity. ([F]FET) was produced in high radiochemical and enantiomeric purity more than 99% and non-decay corrected yield 25±5% in about 55min.