In our most recent article, we detailed four very interesting facts about MRI scans. First we told you about the interesting technology they use that makes them work, and about how it uses no radiation. We also discussed how powerful they are, creating magnetic fields thousands of times that of what you’d normally experience standing on the surface of Earth. Finally, we discussed how MRI scans are just a diagnostic tool and do nothing to address any problems you might be having; magnets have no healing powers.
MRIs are so interesting that we thought we’d better come back with another blog detailing some more amazing facts about MRI scans.
You’re Surrounded By Cold
You might not be able to tell the temperature difference when you’re in the MRI scan, but there’s some very cold stuff nearby. The MRI magnets become more efficient when they’re cooked, and using liquid helium creates superconducting magnets.
The magnets are cooled to just above absolute zero. Absolute zero is the -459.67 degrees Fahrenheit, the coldest temperature possible before all molecular activity essentially stops. Typically the magnets are cooled to -454 degrees Fahrenheit, which is just a degree warmer than what you’d experience in the depths of space!
Don’t Take Guns In!
As you’re probably aware, you shouldn’t take anything metal with you into an MRI room. You’ll hear this information from the technician and will be asked about any jewelry or metal on your clothing. You’ll also be asked to confirm that you don’t have any internal metal such as cochlear implants or pacemakers.
Oh, and you also shouldn’t take guns in with you! An off-duty police officer in New York City found this out when a series of miscommunications let him into the MRI room while still carrying the firearm. It was ripped from his hand, where it stuck to the inside wall of the MRI machine and discharged, firing into a nearby wall. Thankfully no one was injured. If you’d like to read more about it and see pictures of the gun still stuck to the machine, click here..
What’s That Sound?
If people know one thing about MRIs it’s that you can’t wear any metal during the scan because of the magnetic fields. But the second thing that most people know about MRIs is that it can get very loud in the tube. Where does that sound come from?
The magnets in an MRI are surrounded by electromagnetic coils. When the current is turned on, it creates force and heat in the coils, which causes them to expand in an incredibly short amount of time. This expansion causes the popping, banging, or clicking sound. The enclosed area in which a subject is lying makes the sound that much louder.
Do You Need An MRI Scan?
We hope you’ve enjoyed learning a bit more about MRI scans and the machines that make diagnostic imaging so effective. If your doctor has ordered an MRI, we look forward to seeing you here at Fair Lawn Imaging!