RefleXion PET/CT Imaging Performance in Patients With Various Malignancies

PRIMARY OBJECTIVE: I. To assess imaging performance of the \[18F\]-FDG PET-CT subsystem on the X1 RMRS to detect lesions (primary and metastatic) in patients with various types of malignancies. SECONDARY OBJECTIVE: I. To determine the feasibility of generating a BgRT plan using X1 RMRS-acquired \[18F\]-FDG PET data derived from the imaging-only session at the studied dose level. OUTLINE: Patients receive \[18F\]-FDG injection and undergo SOC \[18F\]-FDG PET-CT on study. Patients with at least one PET avid lesion then undergo X1 RMRS PET-CT imaging-only session on study.