{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,19]],"date-time":"2026-06-19T16:20:38Z","timestamp":1781886038042,"version":"3.54.5"},"reference-count":42,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2018,3,1]],"date-time":"2018-03-01T00:00:00Z","timestamp":1519862400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100003246","name":"Nederlandse Organisatie voor Wetenschappelijk Onderzoek","doi-asserted-by":"publisher","award":["STW Project 13375"],"award-info":[{"award-number":["STW Project 13375"]}],"id":[{"id":"10.13039\/501100003246","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":[[2018,10]]},"abstract":"<jats:sec><jats:title>Purpose<\/jats:title><jats:p>To demonstrate a simple head\u2010sized phantom for realistic static and RF field characterization in high field systems.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The head\u2010sized phantom was composed of an ellipsoidal compartment and a spherical cavity to mimic the nasal cavity. The phantom was filled with an aqueous solution of polyvinylpyrrolidone (PVP), to mimic the average dielectric properties of brain tissue. The static and RF field distributions were characterized on a 7T MRI system and compared to in vivo measurements and simulations. MR thermometry was performed, and the results were compared to thermal simulations for RF validation purposes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Accurate reproduction of both static and RF fields patterns observed in vivo was confirmed experimentally and was shown to be strongly affected by the inclusion of the spherical cavity. MR thermometry and transmit efficiency (\n<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mrm27153-math-0003.png\" xlink:title=\"urn:x-wiley:07403194:media:mrm27153:mrm27153-math-0003\"\/>) measurements were obtained in close agreement with simulations (peak values agreeing within 0.3 \u00b0C and 0.02\u2009\u03bcT\/\u221aW) as well as fiber optic thermal probes (RMSE\u2009&lt;\u20090.18 \u00b0C).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>A simple head\u2010sized phantom has been presented that produces B<jats:sub>0<\/jats:sub> and \n<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mrm27153-math-0004.png\" xlink:title=\"urn:x-wiley:07403194:media:mrm27153:mrm27153-math-0004\"\/> nonuniformities similar to those encountered in the human head and allows for accurate MR thermometry measurements, making this a suitable reference phantom for RF validation and methodological development in high field MRI.<\/jats:p><\/jats:sec>","DOI":"10.1002\/mrm.27153","type":"journal-article","created":{"date-parts":[[2018,3,2]],"date-time":"2018-03-02T04:56:52Z","timestamp":1519966612000},"page":"1738-1745","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["A simple head\u2010sized phantom for realistic static and radiofrequency characterization at high fields"],"prefix":"10.1002","volume":"80","author":[{"given":"Wyger M.","family":"Brink","sequence":"first","affiliation":[{"name":"C.J. 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