Imaging Modalities of Urinary System (I)KUB(Kidney-ureter-bladder survey) a plain film of the kidneys and bladder. Useful for the diagnosis of calculi, soft-tissue calcifications and gas Should always be performed prior to contrast medium injectionImaging Modalities of Urinary System （Ⅰ） KUB (Kidney-ureter-bladder survey) • A plain film of the kidneys and bladder. • Useful for the diagnosis of calculi, soft-tissue calcifications and gas. • Should always be performed prior to contrast medium injection