Percutaneous nephrolithotomy ct urography 3d reconstruction objective to assess a modified technique of multidetector computed tomographic urography ctu which can reproducibly and accurately map the pelvicalyceal system pcs and complex renal calculi as such information is essential in choosing the. Ct urography ctu or ct ivu has now largely replaced traditional ivu in imaging the genitourinary tract it gives both anatomical and functional information albeit with a relatively higher dose of radiation the aim is to illustrate the collecting systems ureters and bladder with intravenous contrast albeit in a single acquisition as opposed to the multiple and more dynamic traditional ivu