Figure 2From: In vitro methods for evaluating therapeutic ultrasound exposures: present-day models and future innovationsNanoparticle uptake in type I collagen gels. pFUS exposures in the gels were provided at a single location, after which the gels were immersed in a suspension of 100-nm diameter, fluorescently labeled, polystyrene NPs. In all three gels (a, b, and c), the NPs were initially taken up only in the region of treatment. Even at 24Â h later, the NPs were somewhat more diffuse but still found to be restricted to the treated region (VF, unpublished).Back to article page