| Metal artifacts in MRI from non-magnetic dental alloy and its FEM analysis. | |
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MedLine Citation:
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PMID: 20448408 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Artifacts in MR(Magnetic Resonance) images of oral cavity produced from non-magnetic metal restorations was verified by measuring the image of index finger and a cylinder of fat test piece with a type 4 gold alloy ring using a compact MRI equipment. In the images of finger, portion around the ring disappeared. However, it was nearly restored with a cut ring. In the cylinder of fat test piece, obvious artifacts appeared when circumferential surface of the ring was placed perpendicular to RF(Radio Frequency) field of MRI equipment's excitation/detection coil. However, in other directions or with a cut ring, artifact disappeared. The cause was simulated with FEM(Finite Element Method) electromagnetic field analysis, and alternating magnetic field was shown to induce surface current on the continuous gold ring. Magnetic field produced by that current interfered with the field from excitation coil. This demonstrated the characteristics and cause of artifacts by non-magnetic dental metals. |
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Authors:
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Tomohide Taniyama; Taiji Sohmura; Takanori Etoh; Masaaki Aoki; Eiji Sugiyama; Junzo Takahashi |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-04-24 |
Journal Detail:
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Title: Dental materials journal Volume: 29 ISSN: 0287-4547 ISO Abbreviation: Dent Mater J Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-06-14 Completed Date: 2010-07-19 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8309299 Medline TA: Dent Mater J Country: Japan |
Other Details:
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Languages: eng Pagination: 297-302 Citation Subset: D |
Affiliation:
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Division of Oromaxillofacial Regeneration, Course for Integrated Oral Sciences and Stomatology, Osaka University Graduate School of Dentistry, Osaka, Japan. tom-tani-dental@occn.zaq.ne.jp |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adipose Tissue Artifacts* Dental Alloys* Electromagnetic Fields Finite Element Analysis Gold Alloys Humans Magnetic Resonance Imaging* Radio Waves |
| Chemical | |
Reg. No./Substance:
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0/Dental Alloys; 0/Gold Alloys |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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