{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,10]],"date-time":"2026-07-10T23:34:11Z","timestamp":1783726451333,"version":"3.55.0"},"reference-count":29,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2021,3,23]],"date-time":"2021-03-23T00:00:00Z","timestamp":1616457600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Magnetic Resonance in Med"],"published-print":{"date-parts":[[2021,8]]},"abstract":"<jats:sec><jats:title>Purpose<\/jats:title><jats:p>To demonstrate that strategic use of materials with high electric permittivity along with integrated head\u2010sized coil arrays can improve SNR in the entire brain.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Numerical simulations were used to design a high\u2010permittivity material (HPM) helmet for enhancing SNR throughout the brain in receive arrays of 8 and 28 channels. Then, two 30\u2010channel head coils of identical geometry were constructed: one fitted with a prototype helmet\u2010shaped ceramic HPM helmet, and the second with a helmet\u2010shaped low\u2010permittivity shell, each 8\u2010mm thick. An eight\u2010channel dipole array was used for excitation. In vivo maps of excitation flip angle and SNR were acquired.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Simulation results showed improvement in transmit efficiency by up to 65% and in receive\u2010side SNR by up to 47% on average through the head with use of an HPM helmet. Experimental results showed that experimental transmit efficiency was improved by approximately 56% at the center of brain, and experimental receive\u2010side SNR (SNR normalized to flip angle) was improved by approximately 21% on average through orthogonal planes through the cerebrum, including at the center of the brain, with the HPM.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Although HPM is used increasingly to improve transmit efficiency locally in situations in which the transmit coil and imaging volume are much larger than the HPM, here we demonstrate that HPM can also be used to improve transmit efficiency and receive\u2010side SNR throughout the brain by improving performance of a head\u2010sized receive array. This includes the center of the brain, where it is difficult to improve SNR by other means.<\/jats:p><\/jats:sec>","DOI":"10.1002\/mrm.28780","type":"journal-article","created":{"date-parts":[[2021,3,23]],"date-time":"2021-03-23T10:38:39Z","timestamp":1616495919000},"page":"1167-1174","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["Improved whole\u2010brain SNR with an integrated high\u2010permittivity material in a head array at 7T"],"prefix":"10.1002","volume":"86","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0187-495X","authenticated-orcid":false,"given":"Karthik","family":"Lakshmanan","sequence":"first","affiliation":[{"name":"Bernard and Irene Schwartz Center for Biomedical Imaging Department of Radiology New York University School of Medicine New York New York USA"},{"name":"Center for Advanced Imaging Innovation and Research (CAI2R) Department of Radiology New York University School of Medicine New York New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giuseppe","family":"Carluccio","sequence":"additional","affiliation":[{"name":"Bernard and Irene Schwartz Center for Biomedical Imaging Department of Radiology New York University School of Medicine New York New York USA"},{"name":"Center for Advanced Imaging Innovation and Research (CAI2R) Department of Radiology New York University School of Medicine New York New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jerzy","family":"Walczyk","sequence":"additional","affiliation":[{"name":"Bernard and Irene Schwartz Center for Biomedical Imaging Department of Radiology New York University School of Medicine New York New York USA"},{"name":"Center for Advanced Imaging Innovation and Research (CAI2R) Department of Radiology New York University School of Medicine New York New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryan","family":"Brown","sequence":"additional","affiliation":[{"name":"Bernard and Irene Schwartz Center for Biomedical Imaging Department of Radiology New York University School of Medicine New York New York USA"},{"name":"Center for Advanced Imaging Innovation and Research (CAI2R) Department of Radiology New York University School of Medicine New York New York USA"},{"name":"The Sackler Institute of Graduate Biomedical Science New York New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sebastian","family":"Rupprecht","sequence":"additional","affiliation":[{"name":"HyQRS State College Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qing X.","family":"Yang","sequence":"additional","affiliation":[{"name":"HyQRS State College Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael T.","family":"Lanagan","sequence":"additional","affiliation":[{"name":"HyQRS State College Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4928-7503","authenticated-orcid":false,"given":"Christopher M.","family":"Collins","sequence":"additional","affiliation":[{"name":"Bernard and Irene Schwartz Center for Biomedical Imaging Department of Radiology New York University School of Medicine New York New York USA"},{"name":"Center for Advanced Imaging Innovation and Research (CAI2R) Department of Radiology New York University School of Medicine New York New York USA"},{"name":"The Sackler Institute of Graduate Biomedical Science New York New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,3,23]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/mrm.1910400107"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmri.20603"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jmr.2010.01.003"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/cmr.a.20219"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmri.24435"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-020-17598-3"},{"key":"e_1_2_8_8_1","unstructured":"LuoW YangQX CollinsCM.Improved surface coil performance at any depth in a lossy sphere with a dielectric disc. 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