Siemens MAGNETOM Avanto Operator's Manual page 35

Variations in signal and
Distortions/signal obliteration
along the edges
MAGNETOM Avanto, MAGNETOM Verio | syngo MR E11
Print No. MR-01501G.621.02.02.02
 CAUTION
Static and/or stationary brightness errors on the LCD monitor
due to aging!
Incorrect diagnosis
◆ Scroll through the images to ensure that the MR image does
not show differences in brightness, spots, or cloudiness and
check bright objects for afterglow.
◆ Keep your eyes always in central monitor position with a
vertical view angle towards the screen surface for best image
quality.
 CAUTION
contrast
Inhomogeneous RF field!
Asymmetry of contrast in the MR image
◆ Whenever possible, use a local coil with transmit
characteristics that are more suitable for the desired field of
view.
 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.
Safety 2
35