Ringing artifact

When you take a picture or an image of something, sometimes you might see little lines or circles that weren't really there in real life. Those lines or circles are called ringing artifacts. They happen because when the image gets saved or processed, it sometimes makes things look a little different than they actually are. It's like when you color a picture with crayons and sometimes you go outside the lines a little bit. Ringing artifacts can be annoying if they make the image harder to see, but they can also help scientists and doctors learn more about things they are studying.