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Laryngorhinootologie. 2009 Apr;88(4):236-40. doi: 10.1055/s-0028-1100389. Epub 2008 Dec 8.

[Behaviour of titanium middle ear implants at 1.5 and 3 Tesla field strength in magnetic resonance imaging].

[Article in German]

Author information

  • 1Abteilung Neuroradiologie, Institut für Radiologie, Charité Universitätsmedizin Berlin, Berlin. christian.bauknecht@charite.de

Abstract

BACKGROUND:

Investigations into the MRI compatibility of middle ear implants made from titanium alloys with 1.5 and 3.0 tesla MRI systems which are frequently used for imaging diagnostics.

METHOD:

17 different middle ear (ME) implants (ossicular replacement prosthesis (ORP) and ventilation tubes) made from titanium were tested in vitro. Potential warming was determined via an MRI-compatible fibre optic temperature sensor under the influence of sequences with high-level high frequency impulses. An assessment of the attractive force of the implants was carried out placed on a Petri dish under vibration and floating on rubber-sponge (RS) in a water bath.

RESULTS:

No significant warming of the implants was observed with any of the used sequences at either 3 or 1.5 Tesla field strength (TF). With 3 TF, all 17 implants changed their position on the surface of the water and moved at a slow speed (0.0004-0.0014 m/s) towards the magnetic field. With 1.5 TF, the tested ME implants moved at a maximum speed of 0.0002 m/s and in the case of the ventilation tubes at 0.0005 m/s.

CONCLUSION:

No warming occurred in any of the tested middle ear implants at either 1.5 or 3 TF. The attractive forces exerted through the static magnetic field were overall low at 1.5 and 3 TF, indicating that no dislocation is to be expected if intraoperative anchoring is correctly conducted. Nevertheless, the indication for examination at 3 TF should be carefully considered due to the anatomically sensitive region.

PMID:
19065496
[PubMed - indexed for MEDLINE]
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