Fig. 10
From: Detector-based spectral CT with a novel dual-layer technology: principles and applications
Lesion characterisation. (a) 120-kVp routine-diagnostic (conventional) CT image through the upper abdomen shows a well-defined hypoattenuating lesion in the left kidney (arrow), which has a mean attenuation of 49.5 HU, which is too high for a simple cyst. This can either be a complicated cyst or enhancing solid lesion. (b) VNC reconstruction at the same level shows that the attenuation of the lesion (arrow) is 45.2 HU, indicating that the high attenuation was inherent in the scan and not due to contrast administration (c) Iodine map at the same level confirms the above, with an insignificant (0.2 mg/ml) iodine uptake in the lesion (arrow). This constellation of findings helps in diagnosing this as a complicated renal cyst than an enhancing solid mass