A PET-MRI Study of Serotoninergic Brainstem Pathway in Patients With Dravet Syndrome

"Patients will be seen during an first inclusion visit during which a review of eligibility criteria, medical history and a clinical examination will be done. Participants will be scheduled for a PET-MRI scan within 2 to 8 weeks. For all women of childbearing age a urine pregnancy test will be performed before the PET-MRI.~Anatomical MR imaging will be first acquired for anatomical co-registration and morphometry analyses (Neuromelanin sensitive images and 3D anatomical T1-weighted covering the whole brain volume with 1mm3 cubic voxels) After i.v. injection of a bolus of 180 MBq ± 10%, with a maximum of 198 MBq MBq, of \[18F\]-MPPF, a dynamic emission scan consisting of 35 frames of increasing duration (20s to 5min) will be acquired over 90-min post-injection"