Doctors have started using virtual reality to help kids overcome their fear of MRI scanners in hospitals.
These are massive tubes which use powerful magnets and radio waves to produce a images of inside the body.
Doctors use these images to find out if a person has any problems in their bones, blood vessels, heart or brain.
Although they aren't dangerous, some people find the scanners quite scary - they are very loud and some people don't like being in very small spaces.
So doctors at King's College Hospital in London have been using VR to let patients see what the experience is like, before going through the real thing.
Ricky went to see it in action...