Slide 21/23

Upon ageing, fibrous structures in the dermis become thinner and move upward, as observed in optical imagingUS imaging (up to 75 MHz) lacks resolution to visualize these same fibersInstead, US imaging shows fibers which are located deeper in the dermis and have sizes near the resolution limit, which is higher for 75 MHz than for 22 MHz Papillary-reticular junction is not visualized in US imaging, but possibly in optical imaging

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