HELP Study - Towards High Throughput and Efficient Long-axial PET With Oral [18F]FDG

Inclusion Criteria: * Age ≥19 years * Participants who have received a standard of care \[18F\]FDG PET/CT and are willing to undergo a study specific oral \[18F\]FDG PET/CT within 2 weeks. Exclusion Criteria: Participant Inclusion Criteria * Age ≥19 years * Participants who have received a standard of care \[18F\]FDG PET/CT and are willing to undergo a study specific oral \[18F\]FDG PET/CT within 2 weeks. Participant Exclusion Criteria * Pregnant or breast-feeding * Medically unstable (e.g., acute illness, unstable vital signs) * Urinary incontinence/catheter. * Immobile, frail or vulnerable patients who cannot leave the department and would require an uptake room in any case. * Patients whose fasting blood sugar at the SOC PET was \>11.0 mmol/l * Unable to swallow. * Patients with nasogastric tubes, percutaneous gastrostomy or other non-anatomical routes for nutrition. * Unable to lie flat for 1h (subset of participants - first 5 participants only). * Claustrophobia requiring medication. * Undergoing active treatment or assessment of an upper digestive tract tumor (stomach/esophagus) * Unable to provide written consent * Patients receiving biguanide anti-hyperglycemic agents (e.g. Metformin). * Insulin dependent diabetics.