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This is a contrast CAT scan; intravenous contrast was administered while the images were being obtained. Notice that the kidneys are slightly lighter grey than the adjacent muscle tissue near the vertebral body. This results from the kidney concentrating and excreting iodinated contrast. The renal parenchyma is relatively homogeneous. CAT scans are fairly sensitive indicators of kidney function. If a kidney were not functioning (from lack of perfusion, severe tubular dysfunction, etc.) then the kidneys wouldn't 'enhance' (appear lighter grey). The renal pelvis is white because iodinated contrast has filled the collecting system. |
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