Why do they have to use the jelly to get a reading ? What’s the purpose ? Also bonus if you tell me what it is.
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You know how when you look down at a body of water, the image is distorted? That’s because light rays get bent when they pass between two different types of material. Sound does something similar. Ultrasound devices emit sound waves and listen for the “echo” it makes when it comes back. However, the instrument they use is flat and rigid, while bellies are usually round and squishy. So it’s hard to get the device perfectly placed against an abdomen without any air gaps between them. As a result, the sound waves get jumbled twice, once on the way in and once on the way out, which makes them harder to read. The jelly has a similar consistency to human tissue (at least from the point of view of how sound travels through it), so it lets the instrument make a better “seal” with the skin for a clearer picture.
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