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5 Gauss Fringe Field
 
This line specifies the perimeter around a MR scanner within which the static magnetic fields are higher than five gauss. Five gauss and below are considered 'safe' levels of static magnetic field exposure for the general public.
Due to the physical properties of magnetic fields, the magnetic flux, which penetrates the useful volume of the magnet will return through the surroundings of the magnet to form closed field lines. Depending on the magnet construction, the returning flux will penetrate large open spaces (unshielded magnets) or will be confined largely to iron yokes or through secondary coils (shielded magnets).
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• View the DATABASE results for '5 Gauss Fringe Field' (4).Open this link in a new window

 
Further Reading:
  Basics:
How strong are magnets?
   by my.execpc.com    
  News & More:
Magnetic Field
   by hyperphysics.phy-astr.gsu.edu    
5 Gauss LimitMRI Resource Directory:
 - Safety -
 
The national regulatory boards decided to limit the threshold for access to MRI areas to 5 gauss.


MRI Safety Guidance
It is of special interest for the observer of bureaucratic procedures that the 5 gauss safety limit is ten times higher than the average earth magnetic field, but lower than the magnetic field in electric trains such as subways (up to 7 gauss). For example, the fields measured on the surface of the receiver of a telephone are 35 gauss and of an audio headset 100 gauss.
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• View the DATABASE results for '5 Gauss Limit' (3).Open this link in a new window

 
Further Reading:
  Basics:
Magnetic Sensitivity of MRI Systems to External Iron: The Design Process
   by www.integratedsoft.com    
  News & More:
A Primer on Medical Device Interactions with Magnetic Resonance Imaging Systems
   by govpulse.us    
Modern Implantable Heart Devices Safe For Use In MRI Scans
Wednesday, 16 March 2005   by www.sciencedaily.com    
MRI Resources 
Cochlear Implant - Chemistry - Fluorescence - Intraoperative MRI - Liver Imaging - Distributors
 
5 Gauss Line
 
This line specifies the perimeter around a MR scanner within which the static magnetic fields are higher than five gauss. Five gauss and below are considered 'safe' levels of static magnetic field exposure for the general public.
Portable devices requiring a separation distance between the device and the MR magnet, should not be considered 'MR Safe', 'MR Compatible', or intended for use in the MR environment. Typically the 5 gauss line is the only location where the static magnetic field strength is specified around a MR scanner. Therefore, labeling specifying a separation distance between the MR magnet and the device to ensure safe or proper operation of the device should be avoided.

See also the related poll result: 'In 2010 your scanner will probably work with a field strength of'
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• View the DATABASE results for '5 Gauss Line' (6).Open this link in a new window

 
Further Reading:
  News & More:
Boston Scientific and Biophan in MRI Collaboration
Friday, 21 November 2003   by www.medimaging.net    
MRI Resources 
Most Wanted - MRI Technician and Technologist Jobs - Spine MRI - Raman Spectroscopy - Stimulator pool - Spectroscopy
 
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In 2020 your scanner will probably work with a field strength of :
lower 
1T 
1.5T 
2T 
3T 
7T 
higher 

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