Onishi S, Fujioka C, Kaichi Y, et al - Investigators obtained dual-energy CT (DECT) and Perfusion CT (PCT) images in 24 individuals including histologically diagnosed meningioma in order to examine whether DECT parameters could prognosticate the vascularity of meningiomas. Contrast relative effective atomic number Z (rZ_eff) and iodine both were positively associated with relative blood volume (rBV) derived from PCT. The vascular density results validated positive correlations with rBV and contrast rZ_eff and a negative relationship with relative electron density. Thus, it was found that in comparison with PCT, DECT prognosticated vascular density with feebler radiation exposure. Moreover, PCT for estimating the vascularity of meningiomas could be possibly substituted by DECT.