General precautions and warnings
45
• The exchange of the magnets with the Non-Magnetic Spacer and vice versa has been
tested for at least five repetitions.
• The above instructions should also be followed if areas of the body other than the head
are to be examined (e.g. knee, etc.). When lower extremities are to be examined, it is
recommended that the patient’s legs are positioned in the scanner first.
If the conditions for MRI safety and the Safety Guidelines are not followed, injury to the
patient and/or damage to the implant may result!
Fig. A Head bandage to support fi xation of the implant
Fig. B Image artefacts arising in a 1.5 T scanner. The left picture shows the artefacts obtained with
the implant magnet in place whereas the right picture illustrates the image artefacts when the implant
magnet is replaced with the Non-Magnetic Spacer.
