| Item type |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2010-10-05 |
| タイトル |
|
|
タイトル |
Design and Construction Method of an Open-Type Magnetically Shielded Room for MRI Composed of Magnetic Square Cylinders |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Leakage flux |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
magnetic field analysis |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
magnetically shielded room |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
magnetic resonance imaging |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 著者 |
Hirosato, Shigetaka
Yamazaki, Keita
Haraguchi, Yu
Muramatsu, Kazuhiro
Haga, Akira
Kamata, Kiyotaka
Kobayashi, Koichiro
Matsuura, Atsuo
Sasaki, Hitomi
|
| 著者(機関) |
|
|
値 |
Research & Development Institute, Takenaka Corporation |
| 著者(機関) |
|
|
値 |
Research & Development Institute, Takenaka Corporation |
| 著者(機関) |
|
|
値 |
Department of Electrical and Electronic Engineering, Saga University |
| 著者(機関) |
|
|
値 |
Department of Electrical and Electronic Engineering, Saga University |
| 著者(機関) |
|
|
値 |
Department of Electrical Engineering & Information Technology, Tohoku Gakuin University |
| 著者(機関) |
|
|
値 |
Department of Electric Control Engineering, Kagoshima National College of Technology |
| 著者(機関) |
|
|
値 |
Faculty of Engineering, Iwate University |
| 著者(機関) |
|
|
値 |
Faculty of Engineering, Iwate University |
| 著者(機関) |
|
|
値 |
Faculty of Engineering, Iwate University |
| 登録日 |
|
|
日付 |
2010-10-05 |
| 書誌情報 |
IEEE TRANSACTIONS ON MAGNETICS
巻 45,
号 40,
p. 4636-4639,
発行日 2009-10-01
|
| ISSN |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
0018-9464 |
| Abstract |
|
|
内容記述タイプ |
Other |
|
内容記述 |
To shield the leakage flux densities of 3 T magnetic resonance imaging (MRI) higher than 1.5 T MRI and to reduce the degradation of magnetic properties during construction, the design of an open-type magnetically shielded room (MSR) combined with square cylinders made of magnetic and conductive materials should be improved. This paper reports on an optimal design for magnetic cylinders to improve the shielding effect, while also considering ease of construction with a view to practical use. Firstly, the structure of the magnetic cylinders, such as their opening width and the slit width were optimized using a 3D linear magnetic-field analysis. Using optimal magnetic cylinders, when the relative permeability (μ_r) of the magnetic material is larger than 10 000, the reluctance of gaps between the cylinders is the main contributor to the leakage flux. So, the required (μ_r) of the magnetic material is 10 000 and oriented silicon steel is adopted instead of the non-oriented type. Secondly, as an optimal construction method, it was determined by experiment that oriented silicon steel sheets, annealed after bending, should be laminated so that the effect of gaps on butt joints between steel sheets on the magnetic property of the cylinder becomes smaller. This enables the relative permeability of 10 000 when the maximum flux density of the material in the cylinder is less than 1.7 T. Finally, the minimum thickness of oriented silicon steel sheet of cylinders depending on the distance from a 3 T MRI is obtained using linear magnetic analysis under the condition that the maximum flux density of the material of the cylinder is less than 1.7 T. In the case of the thickness of 3.8 mm, the leakage flux density of 3 T MRI is decreased to less than a guideline (0.5 mT) when the distance between the cylinders and the center of MRI is larger than 2 750 mm. This indicates that the optimal design and construction method of an open-type MSR for 3 T MRI composed of magnetic square cylinders are realized. |
| 出版者 |
|
|
出版者 |
IEEE |
| 権利 |
|
|
権利情報 |
(c) 2009 IEEE |
| DOI |
|
|
関連タイプ |
isIdenticalTo |
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
10.1109/TMAG.2009.2025259 |
| 著者版フラグ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
itm-v45n10p4636-4639.pdf (554.9 kB)
