Unenhanced Computed Tomography (CT) is the gold standard for detection of urinary
stones. An unenhanced phase is considered essential for a high-quality CT urogram.
“Virtual unenhanced” CT scans (ie, CT scans with contrast that are computationally
filtered to subtract out the contrast material) hold promise to reduce radiation exposure
and expedite imaging studies. However, the technique has been limited by low sensitivity
and poor ability to detect of small stones.
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References
- Dual-energy contrast-enhanced computed tomography for the detection of urinary stone disease.Invest Radiol. 2007; 42: 823-829
- Virtual unenhanced dual-energy CT images obtained with a multimaterial decomposition algorithm: diagnostic value for renal mass and urinary stone evaluation.Radiology. 2021; 298 (Epub 2021 Jan 19. PMID: 33464180): 611-619https://doi.org/10.1148/radiol.2021192448
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