{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T18:43:17Z","timestamp":1791398597862,"version":"4.3.3"},"reference-count":34,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2017,6,19]],"date-time":"2017-06-19T00:00:00Z","timestamp":1497830400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["P41 EB017183"],"award-info":[{"award-number":["P41 EB017183"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R01 EB002568"],"award-info":[{"award-number":["R01 EB002568"]}],"id":[{"id":"10.13039\/100000002","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":[[2018,3]]},"abstract":"<jats:sec><jats:title>Purpose<\/jats:title><jats:p>To describe a new bench measurement based on quality (<jats:italic>Q<\/jats:italic>) factors to estimate the coil noise relative to the sample noise of dipole antennas at 7\u2009T.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Placing a dipole antenna close to a highly conductive sample surrogate (HCSS) greatly reduces radiation loss, and using<jats:italic>Q<\/jats:italic><jats:sub>HCSS<\/jats:sub>gives a more accurate estimate of coil resistance than<jats:italic>Q<\/jats:italic><jats:sub>unloaded<\/jats:sub>. Instead of using the ratio of unloaded and sample\u2010loaded<jats:italic>Q<\/jats:italic>factors, the ratio of HCSS\u2010loaded and sample\u2010loaded<jats:italic>Q<\/jats:italic>factors should be used at ultra\u2010high fields. A series of simulations were carried out to analyze the power budget of sample\u2010loaded or HCSS\u2010loaded dipole antennas. Two prototype dipole antennas were also constructed for bench measurements to validate the simulations.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Simulations showed that radiation loss was suppressed when the dipole antenna was HCSS\u2010loaded, and coil loss was largely the same as when the dipole was loaded by the sample. Bench measurements also showed good alignment with simulations.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Using the ratio<jats:italic>Q<\/jats:italic><jats:sub>HCSS<\/jats:sub>\/<jats:italic>Q<\/jats:italic><jats:sub>loaded<\/jats:sub>gives a good estimate of the coil loss for dipole antennas at 7\u2009T, and provides a convenient bench measurement to predict the body noise dominance of dipole antenna designs. The new approach also applies to conventional surface loop coils at ultra\u2010high fields. Magn Reson Med 79:1773\u20131780, 2018. \u00a9 2017 International Society for Magnetic Resonance in Medicine.<\/jats:p><\/jats:sec>","DOI":"10.1002\/mrm.26777","type":"journal-article","created":{"date-parts":[[2017,6,20]],"date-time":"2017-06-20T03:38:14Z","timestamp":1497929894000},"page":"1773-1780","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["A method to assess the loss of a dipole antenna for ultra\u2010high\u2010field MRI"],"prefix":"10.1002","volume":"79","author":[{"given":"Gang","family":"Chen","sequence":"first","affiliation":[{"name":"Center for Advanced Imaging Innovation and Research (CAI2R) and Bernard and Irene Schwartz Center for Biomedical Imaging Department of Radiology, New York University School of Medicine New York New York USA"},{"name":"The Sackler Institute of Graduate Biomedical Sciences New York University School of Medicine New York New York USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher M.","family":"Collins","sequence":"additional","affiliation":[{"name":"Center for Advanced Imaging Innovation and Research (CAI2R) and Bernard and Irene Schwartz Center for Biomedical Imaging Department of Radiology, New York University School of Medicine New York New York USA"},{"name":"The Sackler Institute of Graduate Biomedical Sciences New York University School of Medicine New York New York USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel K.","family":"Sodickson","sequence":"additional","affiliation":[{"name":"Center for Advanced Imaging Innovation and Research (CAI2R) and Bernard and Irene Schwartz Center for Biomedical Imaging Department of Radiology, New York University School of Medicine New York New York USA"},{"name":"The Sackler Institute of Graduate Biomedical Sciences New York University School of Medicine New York New York USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Graham C.","family":"Wiggins","sequence":"additional","affiliation":[{"name":"Center for Advanced Imaging Innovation and Research (CAI2R) and Bernard and Irene Schwartz Center for Biomedical Imaging Department of Radiology, New York University School of Medicine New York New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2017,6,19]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1109\/TAP.1964.1138151"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/mrm.20925"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.595682"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/mrm.21948"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1109\/8.841903"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/mrm.23198"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/mrm.22886"},{"key":"e_1_2_8_9_1","unstructured":"SodicksonDK WigginsGC ChenG LakshmananK LattanziR.More than meets the eye: the mixed character of electric dipole coils and implications for high\u2010field performance. 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