Virtual noncontrast images yield high diagnostic performance (AUC 0

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Presentation transcript:

Virtual Unenhanced Images at Dual-energy CT: Influence on Renal Lesion Characterization Virtual noncontrast images yield high diagnostic performance (AUC 0.91; average error rate, 12%) for helping to differentiate contrast agent–enhanced from unenhanced renal lesions. Diagnostic performance is higher for unenhanced compared with virtual unenhanced images for differentiating contrast-enhanced from unenhanced renal lesions (AUC 0.91 vs 0.96, respectively; P < .001). Whereas a higher error rate may be acceptable in the setting of incidentally discovered renal lesions, this decrease may not be acceptable for dedicated imaging of indeterminate renal lesions. In a 61-year-old with hematuria, contrast-enhanced CT shows a hypodense renal lesion (red arrow) is hypodense on the virtual noncontrast image (green arrow) and isodense unenhanced image (blue arrow), mimicking false-positive enhancement. Meyer M et al. Published Online: Mar 12, 2019 https://doi.org/10.1148/radiol.2019181100