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Siemens AG Healthcare Sector 11/12 MR compatibility data sheet
4
Magnetic fringe field and control area
This table shows the effects of the magnetic fringe field on devices located in the vicinity
of the magnet and the safety distances required. Observe the minimum distances to be
maintained from the center of the x, y, and z axes of the magnet.
Magnetic flux
density Minimum distances
(x = y = radial, z = axial)
Examples: Devices affected
3 mT x = 2.1 m
z = 3.2 m Small motors, watches, cameras, credit
cards, magnetic media
1 mT x = 2.3 m
z = 4.0 m Oscilloscopes, computers, disk drives,
shielded color monitors
0.5 mT x = 2.60 m
z = 4.60 m B/W monitors, magnetic media, cardiac
pacemakers, insulin pumps
0.2 mT x = 3.1 m
z = 5.7 m Siemens CT systems
0.1 mT x = 3.9 m
z = 6.8 m Siemens linear accelerators
0.05 mT x = 4.9 m
z = 8.2 m X-ray I.I., gamma cameras, third party
linear accelerators