| Project/Area Number |
26893078
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Orthodontics/Pediatric dentistry
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| Research Institution | Tokyo Medical and Dental University |
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Principal Investigator |
IMAI HARUKI 東京医科歯科大学, 歯学部附属病院, 医員 (80735837)
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| Project Period (FY) |
2014-08-29 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | MRI / アーチファクト / 磁化率 / 反磁性 |
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| Outline of Final Research Achievements |
MRI diagnosis is often perturbed by susceptibility artifacts when metals are implanted or fixed in the human body. In this study, new method for reduction of artifacts in dental clinical situation was proposed. Covering metallic materials by diamagnetic substance may be an effective approach. Since the direction of magnetization for paramagnetic substance and diamagnetic substance are opposite, artifacts could be cancelled by each other. This covering method was simulated by a simple model; orthodontic metal brackets covered by diamagnetic substance. MR images of the model were taken by 3 Tesla MR scanner, and the artifacts were evaluated by 3D image analyzing method. The results were as follows. Artifacts were neutralized in shapes and the direction of magnetization, and the range and volume of artifacts were decreased. It was suggested that this technique was effective for the reduction of susceptibility artifacts.
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