A 50-year-old male presents to the emergency department with acute onset of severe epigastric pain radiating to the back, associated with nausea and vomiting. The pain began 8 hours ago, following a heavy meal and recent alcohol consumption. On examination, he is febrile (38°C) with epigastric tenderness. Laboratory investigations reveal elevated serum amylase and lipase levels, consistent with acute pancreatitis. Imaging is considered to confirm the diagnosis and assess for complications. What is the most commonly used imaging modality for the diagnosis of acute pancreatitis?
