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KMID : 0352519920290010195
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Korea Univercity Medical Journal
1992 Volume.29 No. 1 p.195 ~ p.202
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Artifacts of Biomedical Implants on Magnetic Resonance Imaging
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Abstract
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Magnetic resonance imaging (MRI) has proved to be a valuable method for evaluation of head and neck. Unfortunately. metallic devices associated with certain dental fillings and applicances often cause variable artifacts in the oral region that
can
obscure normal anatomy or pathologic condition on MR and computed tomography.
In this work, we assessed the MR appearance of dental prosthetic materials in vitro and in vivo including precious alloys, nonprecious alloys resin amalgam and titanum alloy. For in vivo studies, these materials were placed in healthy volunteers
mouth
and then assessed image, analysed the appearance of shape and extent of artifact, and observed the influence of these artifacts on the image interpretation at 0.2 Tesla permanent type MR scanner.
Material used as temporary or permanent filling of crowns such as amalgam, precious alloy and microfilled resin did not cause artifact on the image.
The size of arufact produced by the nonprecious alloys is influenced by ferromagnetism of the object and the volume of prosthesis. and is related to the scanning sequence.
Nonprecious alloys produce minimal local signal distortions. whereas precious alloys. and dental resin had no effect on MR image in vivo.
These results are due mainly to low field strength MR scanner used in this study.
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