A 52-year-old woman presents with acute right upper quadrant pain, fever (38.5°C), and positive Murphy's sign. Serum bilirubin is normal. Ultrasound shows a thickened gallbladder wall, pericholecystic fluid, and a single 1.8 cm stone impacted in the Hartmann's pouch. What is the investigation of choice to confirm acute cholecystitis and assess for complications?

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