You are seeing an 80-year-old male in A & E who has presented with mild flank pain. His observations are: BP 120/80, HR 78, O2 saturation 99% on room air, temperature 37.2 degrees and RR 15. He had several risk factors for an AAA including COPD and a family history on his father’s side. You notice on examination that he has a large pulsatile mass in the centre of his abdomen when you completed your palpation. You requested an abdominal ultrasound scan and the results reported that this gentleman has an abdominal aorta diameter of >5.5cm. What is the next most appropriate imaging to request to obtain a more detailed image of this aneurysm?