Gemini gxl 16

The CT scans were performed on various CT scanner models from multiple institutions, including GE LightSpeed Plus, GE Discovery ST, Toshiba Aquilion One, Toshiba Aquilion, Philips GeminiGXL 16, Philips Brilliance Big Bore, and TomoTherapy Incorporated Hi-Art. CT scans were diagnostic quality, using 120-140 kVp energy, slice thickness of 1-5 mm, and pixel spacing of 0.3-2.7 mm.

All patients were requested to fast for at least 6 h before tracer injection with a serum glucose level of <11.1 mmol/L. ¹⁸F-FDG (JYAMS PET Research and Development Limited, Nanjing, Jiangsu, China) was intravenously injected at a dose of 5.2 MBq (±10%) per kilogram of body weight. After sitting still for 50 to 90 min, the patients were instructed to drink 600 to 1000 mL of water to achieve gastric distension and were scanned in the supine position with breathing at rest.
The ¹⁸F-FDG PET/CT scans were performed using a 16-slice hybrid PET/CT scanner (Gemini GXL16, Philips Medical System, Cleveland, OH, USA). An unenhanced CT scan from the skull base to the upper thigh was performed for attenuation correction (CT scanning parameters: 50 mA, 120 kV, 5 mm section thickness, 5 mm increment, and a pitch of 0.813). A three-dimensional PET scan of the same region was subsequently acquired (8–9 fields of view, 70 s per field). Then, the PET images were reconstructed in a 144 × 144 matrix with a voxel size of 4 mm × 4 mm × 4 mm and a slice thickness of 4 mm by a line-of-response algorithm. CT images were reconstructed to a 512 × 512 matrix with a pixel size of 1.17 mm × 1.17 mm. The attenuation-corrected PET/CT fusion images on three orthogonal (transaxial, coronal, and sagittal) planes were reviewed.