User Manual

6
3 T scans
• Surgically remove the implant magnet before
MR scans at 3 T. See OSI200 Implant Physician’s
Guide for additional information.
• Remove the sound processor before entering the
MRI scan room.
• The sound processor is MR Unsafe.
• Static magnetic eld of 3 T with the implant
magnet surgically removed.
• Maximum spatial eld gradient of 2000 gauss/cm
(20 T/m).
• When using a transmit/receive head coil, a
maximum MR system reported, head averaged
specic absorption rate (SAR) of 3.2 W/kg.
• When using a transmit body coil, a maximum MR
system reported, whole body averaged specic
absorption rate (SAR) of 2 W/kg.
• Scans must be performed in circular polarization
mode.
In non-clinical testing, the maximum image artefact
caused by the OSI200 Implant when imaged with
a gradient echo pulse sequence scan in the axial
plane (Table 3).
With non-magnetic
plug
Implant magnet
removed
4.6 cm (1.8 in) 4.0 cm (1.6 in)
Table 3: Maximum image artefact from centre at
3T (gradient echo sequence).
The image artefact may extend further in the
coronal or sagittal plane.
2
In non-clinical testing, the maximum image artefact
caused by the OSI200 Implant when imaged with
the SEMAC-VAT metal artefact reduction sequence
scan in the axial plane (Table 4).
With non-magnetic
plug
Implant magnet
removed
2.3 cm (0.9 in) 2.7 cm (1.1 in)
Table 4: Maximum image artefact from centre at
3T (SEMAC VAT).
The image artefact may extend further in the
coronal or sagittal plane.
2
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