Development of No Induction Stent That Visualizes in Stent Lumen in MR Imaging
| Project/Area Number |
19591418
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Radiation science
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| Research Institution | Okayama University |
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Principal Investigator |
KOTO Hirokazu Okayama University, 大学院・保健学研究科, 教授 (60127511)
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| Co-Investigator(Kenkyū-buntansha) |
KURODA Masahiro 岡山大学, 大学院・保健学研究科, 教授 (50225306)
KANAZAWA Susumu 岡山大学, 大学院・医歯薬学総合研究科, 教授 (20243511)
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2008: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2007: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | MRI / ステント / 可視化 / ステント内腔 / RF磁場 / 誘導磁場 / Stent / Artifact / Hot spot / Phantom |
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| Research Abstract |
In case that strictures are caused in the hollow viscera such as coronary artery, biliary tact, and esophagus, metallic cylinders consisting mesh pattern (called as stent) are inserted in the strictures in order to expand the narrowed portions. It is required to diagnose the presence of re-stricture in the stent after treatment, but we cannot diagnose the stent lumen using the MRI device.
We found out the causes of the above phenomenon in the MRI diagnosis using the simulation with the finite element method, as follows: The eddy currents are induced in the stent by the RF magnetic fields, B_1, applied for exciting the protons in the human body, and the eddy currents induce the associated magnetic fields. The induced magnetic fields arise so as to counterbalance the applied RF magnetic fields, B_1. As a result, the RF magnetic fields in the stent are decreased, and the flip angle of the protons becomes small.
This considerations led us to the valuable idea for visualizing the stent lumen, that is, the stent must be fabricated so as to have a solenoid-pattern structure, and the solenoidal stent must be placed in the MRI device so as to the central axis of the stent being perpendicular to the direction of the applied RF magnetic fields, B_1.
In the experiment, the lumen in the solenoidal stent was visualized by placing the central axis of the stent being perpendicular to the direction of the applied RF magnetic fields, B_1
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Report
(4 results)
Research Products
(41 results)
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[Presentation] 小型MRIにおける傾斜磁場の設計2008
Author(s)
大村祐一, 伊波智子, 福原誠之, 野原章洋, 池本裕亮, 吉富敬祐, 大野誠一郎, 播本隆, 加藤博和
Organizer
第16回日本放射線技師会中四国放射線技師学術大会 第49回日本放射線技術学会中国・四国部会学術大会
Place of Presentation
徳島
Year and Date
2008-12-07
Related Report
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[Presentation] MRIにおいてフーリェ逆変換を拡張した高画質化の試み2008
Author(s)
福原誠之, 大野誠一郎, 播本隆, 池本裕亮, 吉富敬祐, 伊波智子, 大村祐一, 野原章洋, 加藤博和
Organizer
第16回日本放射線技師会中四国放射線技師学術大会 第49回日本放射線技術学会中国・四国部会学術大会
Place of Presentation
徳島
Year and Date
2008-12-07
Related Report
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