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12
Spatial gradient of the static magnetic field B
The rise of the magnetic field as a function of the distance to the magnet is expressed by
the spatial gradient of B
The magnetic attraction force on a magnetically saturated ferromagnetic object is propor-
tional to this quantity.
Please note: Sometimes this quantity is expressed in G/cm (1 T/m = 100 G/cm).
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
−
0.2
0
0.2
⊗
: At this location, the force on a magnetically saturated ferromagnetic object is greatest.
!
The iso-magnetic contour lines are accurate to a value better than 1%. There is very lit-
tle influence from the environment to the scanner. The graphic shows the cover in
nominal position. On a variety of scanners, the position can vary ±5 mm in the axial
direction. The maximum value therefore has a tolerance of ±10%, as small geometric
deviations can cause a significant change in the value.
Siemens AG Healthcare Sector
. The following figures show lines with the same gradient in T/m.
0
11 T/m
7 T/m
5 T/m
5 T/m
0.4
0.6
0.8
Z Axis (m)
0
10 T/m
1
1.2
1.4
11/12
Side view
Patient table
1.6
1.8
2
MR compatibility data sheet
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