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Ultrasound gel is a vital part of the ultrasound process, acting as a coupling medium between the skin and transducer to allow ultrasound energy waves to travel freely. It works best in combination with a full bladder and comes in various types, including salt-free, water-soluble, and hypoallergenic.
One of the most exciting things about having a baby is seeing the baby’s image on the screen of an ultrasound machine for the first time. To get those priceless first glimpses, however, the mother-to-be must endure the slimy sensation of ultrasound gel squeezed all over her belly before the sonographer can begin. The gel is actually a vital part of the ultrasound process and it would be impossible to get clear pictures of the little guy to show loved ones without the stuff.
When applied directly to the skin, a thin layer of ultrasound gel acts as a coupling medium, or a bridge of sorts, allowing ultrasound energy waves to travel freely between the skin and the sound head of the transducer. A transducer is a portable wand that looks a lot like a small microphone. When the transducer is rubbed along the skin, an image of the inside of the body begins to emerge on the ultrasound monitor. The gel acts as both a lubricant and an energy conductor.
The ultrasound gel, or coupling agent, plays on a basic principle of physics: sound waves tend to travel very well through some form of aqueous medium. The gel works best in combination with a full bladder. The filled bladder also serves as an aqueous medium to acoustically return a clear image that a sonographer can view on a video screen during an exam.
There are several types of ultrasound gel and it is manufactured by many medical supply companies around the world. There are salt-free varieties, water-soluble brands, and hypoallergenic types. Some newer varieties also boast firming and revitalizing properties that are claimed to keep skin fresh and vibrant. Sonographers also often use gel heaters during exams to reduce patient discomfort and create a more pleasant ultrasound experience.
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