Diagnostic Performance Of 4D Dynamic LAFOV FDG-PET Acquisition for Differentiation of Residual Disease and Post-radiation Inflammation in Head Neck SCC Treated by Radiotherapy.

This multicenter prospective observational study will evaluate the value of dynamic FDG-PET LAFOV imaging during the initial therapeutic assessment of a head and neck cancer 3 months after completion of curative radiotherapy.

Inclusion Criteria: * Adult patient ≥ 18 years of age * Presenting with head and neck squamous cell carcinoma * Completed curative treatment with external radiation therapy * Eligible for dynamic LAFOV FDG-PET scan for therapeutic evaluation at 3 months * Having given consent for the end-of-treatment consultation Exclusion Criteria: * Hypersensitivity to 18F-FDG or other excipients contained in the contrast agent * Pregnancy or breastfeeding * History of treated upper gastrointestinal tract cancer * Other histology * Incomplete RTE treatment regimen * Refusal to participate