Artikel
Instrument induced artefacts in magnetic resonance imaging. An experimental study
Instrumentenbedingte Artefakte in der Kernspintomographie. Eine experimentelle Untersuchung
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Autoren
Veröffentlicht: | 23. April 2004 |
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Gliederung
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Objective
Working within the magnetic field of an intraoperative magnetic resonance (MR) scanner requires specially designed surgical instruments. Aim of the present study was to glean materials which could be localised with MR imaging without disturbance of the image acquisition.
Methods
In a phantom and cadaver study, different materials (metal/ceramic) of various geometries were analysed regarding their magnetic characteristics within an open MR scanner (Magnetom open; Siemens, Erlangen, Germany). Several MR sequences were tested regarding image quality and time of acquisition.
Results
Among the studied materials, nitinol provides the best characteristics. It can be easily visualized by MRI without disturbing artefacts. Pickling and electro polishing further improves image quality. MR artefacts are highly dependent on the orientation of the material within the magnetic field, while the geometry of the cone end is irrelevant. A turbo spin echo (TSE) sequence (tse17_21b65.uhc; Siemens, Erlangen, Germany) provides the best image quality with lowest possible time of acquisition (42 seconds).
Conclusions
The magnetic characteristics and material processing are essential to obtain optimal display by MRI. Based on our data, pickled and electro polished nitinol turned out to be the ideal material for MR-compatible instruments.