Hook

Their other posts in the index, biggest breakout first.
There's a new way to see inside your body that could replace MRIs. And it only uses water and sound. A typical MRI uses magnets and radio waves to move protons in your body, creating signals the machine turns into images. But with this new machine, you step into a water bath and get slowly lowered at about 5 centimeters per second. Around you is a ring of tiny sensors, each the size of a grain of sand, that act as both speakers and microphones. They create tiny vibrations that build into one wave, traveling across the tank in 1/2,000th of a second. As the wave passes through your body, it changes shape depending on what it hits. The sensors fire one by one until they've encompassed your whole body, capturing a whopping 17 gigabytes of data per second. By reading how each wave shape changes, they build an image of a slice of your insides. And it does this again and again as you're lowered through the ring, imaging several hundred slices in just 60 seconds. Nearly 100 times faster than an MRI, which could mean way more people get access to scans like this.