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Cross section of films in B-mode, showing presence of an air layer within the native materials (left), and removal of the air layer with ultrasound treatment (right). When the air layer is present, the B-mode ultrasound pulses are completely reflected off the surface and the meshes are not visible in the images. When the air layer is removed (right), B-mode ultrasound pulses pass through the surface and the meshes become visible in the images.
