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Review paper

The effect of the shape of a clip on the magnetic field during magnetic resonance imaging examinations

By
Samir Delibegović Orcid logo ,
Samir Delibegović
Contact Samir Delibegović

Clinic for Surgery, University Clinical Centre of Tuzla, Tuzla, Bosnia and Herzegovina

Mirza Batalović ,
Mirza Batalović

Faculty of Electrical Engineering, University of Sarajevo, Sarajevo, Bosnia and Herzegovina

Mirela Delibegović ,
Mirela Delibegović

Clinic for Radiology, University Clinical Centre Tuzla, Tuzla, Bosnia and Herzegovina

Tarik Bujaković
Tarik Bujaković

Clinic for Orthopaedics and Traumatology, University Clinical Centre Tuzla, Tuzla, Bosnia and Herzegovina

Abstract

Aim
Plastic clips are a diamagnetic material and produce fewer artefacts in the MR field than titanium clips, which are standard
in neurosurgery. However, alongside their physical properties, the shape of the clips, and their very geometry subtlety affects their behaviour in the magnetic field. Therefore, we performed a simulation in order to establish which clips cause less disturbance in the magnetic field from the point of view of the geometry of the body.
Methods
The simulation tool used for the research was the software package COMSOL Mph version 4.3. Since it was a question of
magnetics, the models were prepared in the AC/DC module within the option Magnetic Fields, No Currents (mfnc). Within this module we were able to analyse electro-magnetic fields for a specific geometrical structure, using the Finite Element Method in order to resolve the two-dimensional electromagnetic problems.
Results
The value of the magnetic field with titanium clips with their specific geometric reference lines reached the value of c.
(A/m). The simpler geometry of the plastic clips resulted in a less intensive magnetic field, amounting to c. (A/m), which is an entire order of magnitude less than the field with the titanium clips.
Conclusion
The simpler geometry of the plastic clips and the type of material from which they are made causes less disturbance to
the magnetic field, which was precisely confirmed with the simulation model. The use of plastic clips in neurosurgery and neuroradiology will facilitate the interpretation of MR images.

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