Fig. 4From: Quantification of silver nanoparticle uptake and distribution within individual human macrophages by FIB/SEM slice and viewSimple model of the imaging process of silver NPs by SEM. Due to the escape depth of the electrons within the cell matrix, the detected silver NP volume appears elongated along the optical axis of the SEM. To correct for this effect, the escape depth of the electrons and the shape of the NP clusters needs to be taken into accountBack to article page