ELI5: What is Magnetic resonance imaging (MRI) and how it works?

Imagine you have a bowl of water filled with tiny, tiny spinning tops. These tops are like the water molecules in your body.

Now, let's say you want to see what's inside a toy without breaking it. That's what MRI helps doctors do with your body!

Here's how it works:

1. Big Magnet: Imagine a giant magnet, way stronger than the ones on your fridge. The MRI machine is that giant magnet. When you go into the MRI machine, this magnet makes all those tiny spinning tops (water molecules) line up in the same direction. They're all pointing the same way!

1. Radio Waves: Now, the machine sends out a radio wave – it's like giving the spinning tops a little nudge. This nudge makes some of the tops wobble.

1. Listening for the Wobble: When the radio wave stops, the tops wobble back to their original position. As they wobble, they send out tiny signals (like tiny echoes). The MRI machine is really good at listening for these tiny echoes.

1. Creating a Picture: The machine uses a computer to figure out where each echo came from and how strong it was. It uses this information to create a detailed picture of the inside of your body, showing your bones, muscles, and organs. It's like creating a map of all the wobbles.

• Different types of tissues (like bone, muscle, or brain) have different amounts of water and wobble differently.
• This is how the MRI machine can tell them apart and create a clear image.