To conduct a head-to-head comparison of the diagnostic ability 68Ga-DOTA-FAPI-04 (68Ga-FAPI) and 18F-FDG PET/MR in nasopharyngeal carcinoma (NPC) patients. Patients diagnosed with NPC were prospectively enrolled. All patients underwent head-and-neck 68Ga-FAPI within 1 week. Primary tumor, lymph node numbers, tracer uptake compared by SUVmax visual evaluation. The primary tumor volumes derived f...