Detection of gallbladder gallstone using Dual Energy CT compare to gallblader ultrasound (gold standard).~All patients who undergo dual-energy CT scans will undergo abdominal ultrasound for gallstones.~Performance of CT to conventionnal KeV will be compare to low Kev monoenergetic reconstruction, and Effective Z.~Expected duration of inclusion 3-6 months. No follow-up.
To assess diagnostic performance of Dual Energy CT fo gallblader gallstone detection.