Q:

Prior to an imaging examination using ultrasound, the skin surface is coated with a gel substance known as a “coupling agent”. What is the purpose of the gel?

waelhammad
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2022-10-21
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Prior to an imaging examination using ultrasound, the skin surface is coated with a gel substance known as a “coupling agent”. What is the purpose of the gel? 

  1. To reduce the friction between the skin and the ultrasound transducer.
  2. To eliminate air, which would reflect the ultrasound, from between the skin and transducer.
  3. Since ultrasound travels faster through denser materials, the time delay caused by travelling through air is avoided by using gel.
  4. To avoid an unpleasantly cold sensation that would otherwise be produced by the ultrasound transducer.
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waelhammad
2022-10-21
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B: The impedance difference between air and skin is large, so most of the ultrasound would reflect from the skin, rather than enter the body. Using gel avoids the ultrasound passing through air.

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