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Ultrasound Treatments
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Ultrasound - being very high frequency vibrations - can be used to clean things. In fact, really dirty teeth can be cleaned superbly in this way. Really delicate mechanisms - such as in antique clocks and watches - can also be safely cleaned.
Its use in scanning goes far beyond pregnancies. Many other parts of the body are analysed using it (bladder gallstones, the heart, etc.) but it doesn't even stop there. Aeroplane wings can be checked for cracks that would be invisible on the surface.
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