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ID 48559
JaLCDOI
フルテキストURL
Thumnail 66_3_203.pdf 4.67 MB
著者
Ohno, Seiichiro Department of Radiology, Okayama University Hospital
Harimoto, Takashi Graduate School of Health Sciences, Okayama University
Hirosue, Miyuki Murakami Neurosurgery Clinic
Miyai, Masahiro Department of Radiology, Shimane University Hospital
Hattori, Kengo Graduate School of Health Sciences, Okayama University
Kuroda, Masahiro Graduate School of Health Sciences, Okayama University Kaken ID researchmap
Kanazawa, Susumu Department of Radiology, Okayama University Graduate School of Medicine, Kaken ID
Inamura, Keiji Department of Radiology, Okayama University Hospital
Kato, Hirokazu Graduate School of Health Sciences, Okayama University
抄録
Magnetic resonance imaging (MRI) visualization of metallic stent lumens is possible if the stent structure counteracts eddy currents in the lumen induced by the radio frequency magnetic field, B1. To examine the effectiveness of various stent designs in counteracting eddy currents, we anchored eight copper stent models and 2 commercially available nickel-titanium alloy (Nitinol) stents in a gel phantom, perpendicular or parallel to the direction of B1. A mesh stent lumen showed hypointensity irrespective of its alignment relative to B1. A solenoid stent lumen showed hypointensity with the stent axis parallel to B1, but it had the same signal intensity as outside the lumen when perpendicular to B1. A Moebius stent lumen showed no signal reduction, irrespective of alignment relative to B1. Lumens of the commercially available stents showed hypointensity regardless of alignment relative to B1. Computer simulation revealed that the signal intensities of the stents corresponded to magnetic flux densities of B1 in the stents, which are modified by the structure of the stent. While in vivo MRI viewing of a Moebius stent lumen is likely possible regardless of axis alignment, inherent structural weakness may be problematic. As a more practical choice, the solenoid stent is easier to manufacture and generates no hypointensive signal when the axis is parallel to B0.
キーワード
MRI
visualization of stent lumen
solenoid pattern
Moebius pattern
direction of B1
Amo Type
Original Article
発行日
2012-06
出版物タイトル
Acta Medica Okayama
66巻
3号
出版者
Okayama University Medical School
開始ページ
203
終了ページ
211
ISSN
0386-300X
NCID
AA00508441
資料タイプ
学術雑誌論文
言語
English
著作権者
CopyrightⒸ 2012 by Okayama University Medical School
論文のバージョン
publisher
査読
有り
PubMed ID
Web of Science KeyUT
関連URL
http://ousar.lib.okayama-u.ac.jp/metadata/48542