Document Detail


Image distortion and artifacts caused by the use of a titanium aneurism clip in 1.5 tesla- and 3 tesla-magnetic resonance imaging: effect on (60)cobalt stereotactic radiosurgery treatment planning.
MedLine Citation:
PMID:  24953318     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
In gamma knife stereotactic radiosurgery (GKSRS) treatment planning, 1.5 tesla (T)-magnetic resonance imaging (MRI) is normally used to identify the target lesion. Image artifacts and distortion arise in MRI if a titanium clip is surgically implanted in the brain to treat cerebral aneurysm. 3-T MRI scanners, which are increasingly being adopted, provide imaging of anatomic structures with better clinical usefulness than 1.5-T MRI machines. We investigated signal defects and image distortions both close to and more distant from the titanium clip in 1.5-T and 3-T MRI. Two kinds of phantoms were scanned using 1.5-T and 3-T MRI. Acquisitions with and without the clip were performed under the same scan parameters. No difference was observed between 1.5 T and 3 T in local decrease of signal intensity; however, image distortion was observed at 20 mm from the clip in 3 T. Over the whole region, the distortions caused by the clip were less than 0.3 mm and 1.6 mm under 1.5-T and 3-T MRI, respectively. The geometric accuracy of 1.5-T MRI was better than 3-T MRI and thus better for GKSRS treatment planning. 3-T MRI, however, appears less suitable for use in treatment planning.
Authors:
Hisato Nakazawa; Osamu Yamamuro; Yukio Uchiyama; Masataka Komori
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nihon Hoshasen Gijutsu Gakkai zasshi     Volume:  70     ISSN:  0369-4305     ISO Abbreviation:  Nihon Hoshasen Gijutsu Gakkai Zasshi     Publication Date:  2014 Jun 
Date Detail:
Created Date:  2014-06-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7505722     Medline TA:  Nihon Hoshasen Gijutsu Gakkai Zasshi     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  534-41     Citation Subset:  IM    
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