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[[File:Corticomedullary phase CT in axial and coronal plane, and parenchymal phase, of renal cell carcinoma.jpg|thumb|Selected images from a renal mass specific protocol CT. Corticomedullary phase (axial 7a) demonstrates peripheral enhancement of the renal cortex with minimal opacification of the renal medulla. There is a large renal cell carcinoma in the right kidney which can be differentiated from the normal renal parenchyma by the heterogeneous and differential enhancement. The renal artery and vein are opacified in this phase as well. The collecting system is not opacified (coronal reformat 7b). In the parenchymal phase, the renal cortex and the medulla are enhancing. The renal cell carcinoma in the left kidney is not as well defined when compared to the corticomedullary phase images, but is actually slightly more conspicuous. There is some contrast noted within the collecting system during this phase (7c).<ref name=Guite2013/>]]
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*Initial '''noncontrast CT''', important for detecting calcium or fat in a lesion, and to provide baseline attenuation of any renal masses).<ref name=Guite2013>{{cite book|title=Selected Topics on Computed Tomography|author=Dongqing Wang|isbn=9789535111023|year=2013}} License: [https://creativecommons.org/licenses/by/3.0/ CC-BY-3.0]. Chapter 1: "[https://www.intechopen.com/books/selected-topics-on-computed-tomography/computed-tomography-in-abdominal-imaging-how-to-gain-maximum-diagnostic-information-at-the-lowest-ra Computed Tomography in Abdominal Imaging: How to Gain Maximum Diagnostic Information at the Lowest Radiation Dose]" by Kristie Guite, Louis Hinshaw and Fred Lee. DOI: 10.5772/55903</ref>
