Fig. 3
From: Detector-based spectral CT with a novel dual-layer technology: principles and applications
Salvage of a suboptimal vascular study. (a) Coronal 120-kVp routine diagnostic CT image in a patient being evaluated for radiofrequency ablation of pulmonary veins, shows poor contrast opacification of the vascular structures, particularly the left atrium (arrow), due to contrast extravasation during the scanning. (b) 45-keV virtual monoenergetic image (VMI) at the same level shows significant improvement in the contrast attenuation, especially in the left atrium (arrow). This obviates the need for an additional scan with another contrast bolus, saving radiation and contrast dose