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HFUS skin scanning principles. 1. Piezoelectric probe, 2. Water in the applicator tip, 3. Direction of the ultrasound crystal movement, 4. Penetrating ultrasound wave, 5. Reflected ultrasound waves, 6. Membrane on the applicator tip, 7. Ultrasound contact gel, 8. Epidermis, 9. Dermis, 10. Subcutaneous fat
