Siemens MAGNETOM Skyra fit Operator's Manual page 36

2 Safety
Distortions/signal obliteration
along the edges
Localization errors due to
distortion
Potato chip artifact
36
 CAUTION
Spatial non-linearity of the gradient field and inhomogeneity of
the static magnetic field!
Pin-cushion and barrel-shaped distortions and/or loss of
signal in the margins of the MR image
◆ Go through a distortion correction.
◆ Position the region to be examined as close to the magnet
isocenter as possible.
◆ Use phantoms for the control measurements.
 CAUTION
Incorrect localization data due to spatial non-linearity of the
gradient field and inhomogeneity of the static magnetic field!
Incorrect stereotactic planning or breast biopsy
◆ Take localization errors into account while planning
stereotactic interventions or breast biopsies.
 CAUTION
Distorted slice edges in the margin due to spatial non-linearity of
the gradient field and inhomogeneity of the static magnetic
field!
Incorrect stereotactic planning
◆ When planning stereotactic interventions, take into account
slice distortion at the margins of the MR image. This applies in
particular to graphic slice positioning (GSP) as well as other
graphic slice displays and slice positioning data independent
of the possible use of distortion correction.
MR System | Operator Manual
Print No. M6-04401.621.02.02.02