| Item type |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2023-03-17 |
| タイトル |
|
|
タイトル |
Evaluation of RF Heating on Humerus Implant in Phantoms during 1.5T MR Imaging and Comparisons with Electromagnetic Simulation |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
magnetic resonance imaging |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
metallic implant |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
RF heating |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
electromagnetic simulation |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
MRI safety |
| 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 |
村中, 博幸
堀口, 隆良
笛吹, 修治
上田, 善武
中村, 修
池田, 文昭
岩倉, 健
中谷, 儀一郎
|
| 著者（英） |
|
|
|
姓名 |
Muranaka, Hiroyuki |
|
|
言語 |
en |
| 著者（英） |
|
|
|
姓名 |
Horiguchi, Takayoshi |
|
|
言語 |
en |
| 著者（英） |
|
|
|
姓名 |
Usui, Shuji |
|
|
言語 |
en |
| 著者（英） |
|
|
|
姓名 |
Ueda, Yoshitake |
|
|
言語 |
en |
| 著者（英） |
|
|
|
姓名 |
Nakamura, Osamu |
|
|
言語 |
en |
| 著者（英） |
|
|
|
姓名 |
Ikeda, Fumiaki |
|
|
言語 |
en |
| 著者（英） |
|
|
|
姓名 |
Iwakura, Ken |
|
|
言語 |
en |
| 著者（英） |
|
|
|
姓名 |
Nakaya, Giichirou |
|
|
言語 |
en |
| 抄録 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
Purpose: To evaluate the effect of radiofrequency (RF) heating on a metallic implant during magnetic resonance imaging (MRI), temperatures at several positions of an implant were measured, and results are compared with electromagnetic simulations using a finite element method.Methods: A humerus nail implant made of stainless steel was embedded at various depths of tissue-equivalent gel-phantoms with loop (loop phantom) and partially cut loop (loop-cut phantom), and the phantoms were placed parallel to the static magnetic field of a 1.5T MRI device. Scans were conducted at maximum RF for 15 min, and temperatures were recorded with 2 RF-transparent fiberoptic sensors. Finally, electromagnetic-field analysis was performed.Results: Temperatures increased at both ends of the implants at various depths, and temperature increase was suppressed with increasing depth. The maximum temperature rise was 12.3°C at the tip of the implant and decreased for the loop-cut phantom. These tendencies resembled the results of electromagnetic simulations.Conclusion: RF heating was verified even in a nonmagnetizing metal implant in a case of excessive RF irradiation. Particularly, rapid temperature rise was observed at both ends of the implant having large curvatures. The difference in temperature increase by depth was found to reflect the skin-depth effect of RF intensity. Electromagnetic simulation was extremely useful for visualizing the eddy currents within the loop and loop-cut phantoms and for evaluating RF heating of a metallic implant for MRI safety. |
|
言語 |
en |
| 書誌情報 |
Magnetic resonance in medical sciences : MRMS
巻 5,
号 2,
p. 79-88,
発行日 2006
|
| 出版者 |
|
|
出版者 |
日本磁気共鳴医学会 |
| ISSN |
|
|
収録物識別子タイプ |
PISSN |
|
収録物識別子 |
1347-3182 |
| 書誌レコードID |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA11648770 |
| 権利 |
|
|
権利情報 |
本論文の著作権は日本磁気共鳴医学会に属する |
| 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 |
MRMS-5(2).pdf (2.7 MB)
