Biograph 16 hi rez pet ct scanner

All FDG-PET/CT examinations were performed on a Biograph 16 (Hi-Rez) PET/CT scanner (Siemens Medical Solutions) with an integrated PET and 16-MDCT scanner or a Discovery VCT PET/CT scanner (Siemens Medical Solutions) with an integrated PET and 64-MDCT scanner. All FDG-PET examinations were performed on a HR Plus PET scanner (Siemens Medical Solutions). Standard clinical protocol included: All patients fasted with hydration for at least 6 hours prior to PET/CT examinations. Patients had blood glucose levels <200 mg/dL prior to intravenous injection of 12.5 +/- 2.5 mCi of 18F-FDG was injected intravenously followed by a 10-mL normal saline flush. Patients rested for 60 +/- 15 minutes and voided before being positioned supine on the scanner table. CT examinations were performed after the injection of 150 mL of iohexol (Omnipaque 350, GE Healthcare) unless contraindicated due to allergy or renal impairment. CT images were reconstructed as contiguous 5-mm slices for the entire body and if there was a head and neck indication as a second set of contiguous 3-mm slices through the head and neck. No oral contrast media was administered. PET was performed immediately following CT, without patient repositioning. PET images were obtained at 7-10 bed positions per patient, with an acquisition time of 3 to 4 minutes per station, from the skull vertex through the mid thigh.