Fig. 11
From: Detector-based spectral CT with a novel dual-layer technology: principles and applications
Virtual non-contrast. (a) Axial 120-kVp routine diagnostic image at the level of kidneys shows a contrast-filled stent graft lumen within the proximal abdominal aorta. (b) Virtual non-contrast reconstruction at the same level has removed the pixels which contained iodine. (c) Compare this with the true non-contrast image obtained at the same level, which shows similar appearance and attenuation values as the virtual non-contrast. In multi-phasic studies, especially in vascular indications, the true non-contrast phase can be excluded, resulting in significant radiation dose savings