Fig. 3From: Illegal intra-corporeal packets: can dual energy CT be used for the evaluation of cocaine concentration? A cross sectional studyScatter-plot of the effective atomic number Z(eff) versus ΔHU (r = 0.98). Z(eff) can be inferred from ∆HU using the equation of the curve: Z(eff) = 7.521 + ∆HU × 0.009275 − 0.000008 × ∆HU2Back to article page