Most of the MRI scanners today use superconducting magnets that need liquid helium to keep them cold enough for proper function. A malfunction may, however, cause the helium to convert to gas and rapidly escape the cryogenic chamber that effectively demagnetizes the main MRI magnet. When this happens, a MRI magnet is said to have "quenched". This not only incurs expensive repairs to the equipment but the rapidly escaping helium in the close confines of a MRI suite may also cause asphyxiation injury to any person present there. Fortunately this catastrophe is extremely rare and has been virtually eliminated in the newer equipment through improved design.
No, MRI scanners can 'see through' hair
Magnetic Resonance Imaging
MRI scanners have practically no adverse effects. MRI or magnetic resonance imaging works by noting difference of various images created by varying response of different body tissues.
mri scanners, x-rays, finger-print scanners, ect.
An MRI quench can be caused by a rapid loss of helium coolant due to a failure in the cryogenic system, such as a vacuum breach or mechanical failure. External factors like power outages, excessive heat, or improper handling during maintenance can also trigger a quench. Additionally, excessive pressure or temperature changes in the superconducting magnets can lead to instability, resulting in a quench event. Such incidents can compromise the MRI's functionality and pose safety risks.
Most of the MRI scanners today use superconducting magnets that need liquid helium to keep them cold enough for proper function. A malfunction may, however, cause the helium to convert to gas and rapidly escape the cryogenic chamber that effectively demagnetizes the main MRI magnet. When this happens, a MRI magnet is said to have "quenched". This not only incurs expensive repairs to the equipment but the rapidly escaping helium in the close confines of a MRI suite may also cause asphyxiation injury to any person present there. Fortunately this catastrophe is extremely rare and has been virtually eliminated in the newer equipment through improved design.
MRI scanners are easy to operate. However if you want to go to school to learn more details about scanners you can join a vocational school that lets you know information like that.
Liquid helium is used to cool the superconducting electromagnets.
The "body scanners" that use it are Magnetic Resonance Imaging, or MRI, machines. (The scanners at airports are akin to radar sets, and don't use liquid helium.) MRI machines contain a very large electromagnet. To keep the thing from requiring its own power plant, an MRI magnet is wound with superconducting wire - wire with, effectively, no resistance. Superconducting wire must be kept at the temperature of liquid helium if you want it to superconduct.
helium is used to cool superconducting magnets in mri scanners as helium is lighter then air airships use them as gasses
Yes, a magnetic resonance imaging scanner uses an RF pulse to excite nuclei in the body. Practically all medical MRI scanners are tuned to excite hydrogen nuclei. Other MRI scanners used in physics and chemistry labs are tuned to excite other nuclei -- see the links for a detailed list.
my MRI of my brain says there is dark fluid what does this mean