Multi-detector Computed Tomography
The sleeve volume was assessed preoperatively and two years after surgery using multi-detector computed tomography (MDCT) virtual gastroscopy and 3D reconstruction. MDCT gastrography was performed using multi-detector (64 detectors) CT scanners (Siemens SOMATOM® Perspective, Siemens Medical Solutions, Malvern, PA, USA). Patients were instructed to fast for at least 4 h before examination and were given an intravenous injection of 40 mg butyl-scopolamine, then asked to swallow 2 to 4 packs of effervescent granules (sodium bicarbonate) as tolerated on the table with no water [