- Patients must not have a blood glucose of greater than or equal to 200mg/dL at the time of PET-MRI or if a patient is diabetic and glucose is not controlled. At the discretion of the PI and the authorized user and with their approval prior to 2-[18]fluoro-2-deoxy-D-glucose (FDG) injection, patients with blood glucose ≥ 200 mg/dL may participate in the study.