Very low temperature Trivia:Magnetic Resonance Imaging

Liquid helium is a vital component for operating magnetic resonance imaging(MRI) scanners—the non-intrusive imaging technology that allows medical professionals…

Liquid helium is a vital component for operating magnetic resonance imaging(MRI) scanners—the non-intrusive imaging technology that allows medical professionals to see inside patients’ bodies. Coils of metal wire inside the scanner are doused repeatedly in the ultracold fluid to minimize their electrical resistance. These wires generate a strong magnetic field up to 40,000 times greater than the field of the Earth.

Very low temperature Trivia:Magnetic Resonance Imaging
Very low temperature Trivia:Magnetic Resonance Imaging

There is a problem with this current setup: We are running low on helium. The substance is in worryingly short supply with no known way to manufacture any more. The average scanner requires 1,700 liters (449 gal) of liquid helium to cool the magnetic coils to a chilling -269 degrees Celsius (-452 °F).

Nuclear magnetic resonance is a nuclear nucleus with a non-zero magnetic moment. The spin energy level undergoes Zeeman splitting under the action of an external magnetic field, and the resonance absorbs the physical process of radio frequency radiation of a certain frequency. Nuclear magnetic resonance spectroscopy is a branch of spectroscopy whose resonance frequency is in the radio frequency band, and the corresponding transition is the transition of the nuclear spin at the nuclear Zeeman level.


Nuclear magnetic resonance imaging: Magnetic resonance imaging (MRI) has become a common imaging method. As a new imaging technique, MRI does not affect human health, but it is not suitable for nuclear magnetic resonance in six groups. Check: people who have a pacemaker, people with or suspected metal foreign bodies in the eyeball, people with aneurysm silver clip ligation, people with metal foreign bodies remaining in the body or metal prosthesis, critically ill patients at risk, claustrophobia Phobia patients, etc. It is not possible to bring monitoring instruments, rescue equipment, etc. into the MRI laboratory. In addition, pregnant women who are less than 3 months pregnant, it is best not to do MRI.

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