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. Author manuscript; available in PMC: 2010 Jul 1.

Published in final edited form as: AJR Am J Roentgenol. 2009 Jul;193(1):47–54. doi: 10.2214/AJR.09.2592

Contrast-enhanced dual energy split-bolus CT urogram in a 68 year-old woman. (A) Axial contrast-enhanced image combining the high and low kVp data shows right nephrostomy tube and contrast in renal pelvis. (B) “Virtual unenhanced” image after iodine subtraction reveals a large stone in right renal pelvis. (C) “Iodine only” image in orange overlaid on the “virtual non-contrast” image shows a sepstation (arrow) within the right renal cyst, seen in retrospect on the contrast-enhanced image (A), indicating this is a Bosniak II cyst. (Courtesy, Dr. Robert Hartman, Mayo Clinic)

Contrast-enhanced dual energy split-bolus CT urogram in a 68 year-old woman. (A) Axial contrast-enhanced image combining the high and low kVp data shows right nephrostomy tube and contrast in renal pelvis. (B) “Virtual unenhanced” image after iodine subtraction reveals a large stone in right renal pelvis. (C) “Iodine only” image in orange overlaid on the “virtual non-contrast” image shows a sepstation (arrow) within the right renal cyst, seen in retrospect on the contrast-enhanced image (A), indicating this is a Bosniak II cyst. (Courtesy, Dr. Robert Hartman, Mayo Clinic)