Study Of Post Processing Techniques Acquired With 16-detector Row Spiral CT In Diagnosis Of Biliary Obstruction

Objectives:To study the post processing techniques acquired with 16-detector row spiral CT in the diagnosis of patients with biliary obstruction and evaluate its diagnostic efficacy. Methods:198 cases with biliary obstruction underwent CT examination with Toshiba Aquillion 16-detector row spiral CT scanner. Scan volume ranged from the dome of the diaphragm to below the fourth portion of the duodenum. Reconstructions with the lowest practical slice thickness were done and post processing reconstructions (PPR) were acquired including Multi Planar Reconstruction ( MPR), volume rendering (VR), curved planar reformation (CPR) and minimum intensity projection (MinIP). Preoperative diagnoses were made with precontrast scan, postcontrast scan and PPR, and then compared with axial muti-slice spiral computer tomography (MSCT) alone, sonography, magnetic resonance cholangiopancreatography (MRCP) combined with magnetic resonance imaging (MRI). All cases were further confirmed by surgery or endoscopic retrograde cholangiopancreatography (ERCP). The diagnostic efficacy of 16-detector row spiral CT with PPR on the localizing diagnosis and qualitative diagnosis of biliary obstructive diseases was analyzed. Results:The causes of 198 biliary obstruction included 38 cases of pancreatic head carcinoma (19.2%), 18 cases of ampullary carcinoma (9%), 24 cases of cholangiocarcinoma (12.1%), 8 cases of carcinoma of gallbladder (4%), 3 cases of carcinoma of duodenum (1.5%), 8 cases of hilar metastatic lymph nodes (4%), 5 cases of metastasis...