Metal artifacts in MRI from non-magnetic dental alloy and its FEM analysis
スポンサーリンク
概要
- 論文の詳細を見る
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.
- 2010-05-01
著者
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AOKI Masaaki
NEOMAX CO., LTD.
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SOHMURA Taiji
Division of Oralmaxillofacial Regeneration, Osaka University Graduate School of Dentistry
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TANIYAMA Tomohide
Division of Oromaxillofacial Regeneration, Course for Integrated Oral Sciences and Stomatology, Osak
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ETOH Takanori
Department of Implantology, Osaka Dental University Hospital
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SUGIYAMA Eiji
NEOMAX Co., Ltd
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TAKAHASHI Junzo
IDS Co., Ltd
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Aoki Masaaki
Neomax Co. Ltd
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Etoh Takanori
Department Of Implantology Osaka Dental University Hospital
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Sohmura Taiji
Division Of Oromaxillofacial Regeneration Course For Integrated Oral Sciences And Stomatology Osaka
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Sohmura Taiji
Division Of Biomaterial Science Graduate School Of Dentistry Osaka University
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Sugiyama Eiji
Neomax Co. Ltd
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Taniyama Tomohide
Division Of Oromaxillofacial Regeneration Course For Integrated Oral Sciences And Stomatology Osaka
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Takahashi Junzo
Ids Co. Ltd
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