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A 75 year old man presents with a two day history of constipation, colicky suprapubic abdominal pain, and faeculent vomiting. He has no other medical problems and has not previously undergone a laparotomy. Examination reveals a distended abdomen and no tenderness. Abdominal X-ray demonstrates dilated bowel loops in the peripheral part of the abdominal cavity. Renal function is normal. Which of the following is the most appropriate next investigation after stabilisation?