{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,7]],"date-time":"2025-11-07T13:31:26Z","timestamp":1762522286759,"version":"3.40.5"},"reference-count":54,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2019,6,14]],"date-time":"2019-06-14T00:00:00Z","timestamp":1560470400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100011264","name":"FP7 People: Marie-Curie Actions","doi-asserted-by":"publisher","award":["238802"],"award-info":[{"award-number":["238802"]}],"id":[{"id":"10.13039\/100011264","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Magnetic Resonance in Med"],"published-print":{"date-parts":[[2019,11]]},"abstract":"<jats:sec><jats:title>Purpose<\/jats:title><jats:p>To evaluate radiofrequency (RF) induced tissue heating around aneurysm clips during a 7T head MR examination and to determine the decoupling distance between multiple implanted clips.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A total of 120 RF exposure scenarios of clinical relevance were studied using specific absorption rate and temperature simulations. Variations between scenarios included 2 clips (18.8 and 51.5 mm length), 2 MR\u2010operating modes, 2 head models, and 3 thermoregulation models. Furthermore, a conservative approach was developed to allow for safe scans of patients with aneurysm clips even if detailed information on the implanted clip is unknown. A dedicated simulation\u2010based approach was applied to determine the decoupling distance between multiple implanted clips.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>For all 60 clinical scenarios with the 18.8\u2010mm\u2010long clip, the absolute tissue temperature remained below regulatory limits. For 15 of 60 scenarios with the 51.5\u2010mm\u2010long clip, limits were slightly exceeded (less than 1\u00b0C). The conservative approach led to a maximum time\u2010averaged input power of the RF coil of 3.3W. The corresponding B<jats:sub>1<\/jats:sub><jats:sup>+<\/jats:sup> is 1.32 \u00b5T. A decoupling distance of 35 mm allows the aneurysm clips to be treated as uncoupled from one other.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Safe scanning conditions with respect to RF\u2010induced heating can be applied for single or decoupled aneurysm clips in a 7T ultra\u2010high field MRI setting. Multiple aneurysm clips separated by less than 35 mm need further investigations.<\/jats:p><\/jats:sec>","DOI":"10.1002\/mrm.27835","type":"journal-article","created":{"date-parts":[[2019,6,14]],"date-time":"2019-06-14T09:44:37Z","timestamp":1560505477000},"page":"1859-1875","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Radiofrequency induced heating around aneurysm clips using a generic birdcage head coil at 7 Tesla under consideration of the minimum distance to decouple multiple aneurysm clips"],"prefix":"10.1002","volume":"82","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0601-2489","authenticated-orcid":false,"given":"Yacine","family":"Noureddine","sequence":"first","affiliation":[{"name":"Erwin L. 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