{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,18]],"date-time":"2026-06-18T13:30:59Z","timestamp":1781789459369,"version":"3.54.5"},"reference-count":57,"publisher":"Public Library of Science (PLoS)","issue":"11","license":[{"start":{"date-parts":[[2018,11,27]],"date-time":"2018-11-27T00:00:00Z","timestamp":1543276800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R01MH111265"],"award-info":[{"award-number":["R01MH111265"]}],"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":["R01EB009848"],"award-info":[{"award-number":["R01EB009848"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"name":"CAPES Foundation","award":["13385\/13-5"],"award-info":[{"award-number":["13385\/13-5"]}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"DOI":"10.1371\/journal.pone.0206127","type":"journal-article","created":{"date-parts":[[2018,11,27]],"date-time":"2018-11-27T18:53:47Z","timestamp":1543344827000},"page":"e0206127","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":42,"title":["In-vivo and numerical analysis of the eigenmodes produced by a multi-level Tic-Tac-Toe head transmit array for 7 Tesla MRI"],"prefix":"10.1371","volume":"13","author":[{"given":"Tales","family":"Santini","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yujuan","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sossena","family":"Wood","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Narayanan","family":"Krishnamurthy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junghwan","family":"Kim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nadim","family":"Farhat","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Salem","family":"Alkhateeb","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tiago","family":"Martins","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minseok","family":"Koo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tiejun","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Howard J.","family":"Aizenstein","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5338-5635","authenticated-orcid":true,"given":"Tamer S.","family":"Ibrahim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2018,11,27]]},"reference":[{"issue":"1","key":"ref1","doi-asserted-by":"crossref","first-page":"12","DOI":"10.1016\/j.jmr.2003.11.003","article-title":"Image brightening in samples of high dielectric constant","volume":"167","author":"J. Tropp","year":"2004","journal-title":"J Magn Reson"},{"issue":"1","key":"ref2","doi-asserted-by":"crossref","first-page":"58","DOI":"10.1002\/nbm.1094","article-title":"In-depth study of the electromagnetics of ultrahigh-field MRI","volume":"20","author":"TS Ibrahim","year":"2007","journal-title":"Nmr Biomed"},{"issue":"1","key":"ref3","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1002\/mrm.1156","article-title":"7T vs. 4T: RF power, homogeneity, and signal-to-noise comparison in head images","volume":"46","author":"JT Vaughan","year":"2001","journal-title":"Magn Reson Med"},{"issue":"6","key":"ref4","doi-asserted-by":"crossref","first-page":"1235","DOI":"10.1002\/jmri.20919","article-title":"Insight into RF power requirements and B1 field homogeneity for human MRI via rigorous FDTD approach","volume":"25","author":"TS Ibrahim","year":"2007","journal-title":"J Magn Reson Imaging"},{"issue":"6","key":"ref5","doi-asserted-by":"crossref","first-page":"922","DOI":"10.1118\/1.595995","article-title":"Radiofrequency penetration and absorption in the human body: Limitations to high\u2010field whole\u2010body nuclear magnetic resonance imaging","volume":"14","author":"P. R\u00f6schmann","year":"1987","journal-title":"Medical physics"},{"issue":"1","key":"ref6","doi-asserted-by":"crossref","first-page":"244","DOI":"10.1002\/mrm.21751","article-title":"Whole\u2010body imaging at 7T: preliminary results","volume":"61","author":"JT Vaughan","year":"2009","journal-title":"Magnetic resonance in Medicine"},{"issue":"5","key":"ref7","doi-asserted-by":"crossref","first-page":"1468","DOI":"10.1002\/mrm.22927","article-title":"Local specific absorption rate control for parallel transmission by virtual observation points","volume":"66","author":"G Eichfelder","year":"2011","journal-title":"Magnetic resonance in medicine"},{"issue":"1","key":"ref8","doi-asserted-by":"crossref","first-page":"286","DOI":"10.1002\/mrm.23198","article-title":"Ideal current patterns yielding optimal signal\u2010to\u2010noise ratio and specific absorption rate in magnetic resonance imaging: Computational methods and physical insights","volume":"68","author":"R Lattanzi","year":"2012","journal-title":"Magnetic Resonance in Medicine"},{"key":"ref9","article-title":"20-To-8 Channel Tx Array with 32-Channel Adjustable Receive-Only Insert for 7T Head Imaging","author":"T Ibrahim","year":"2013"},{"key":"ref10","doi-asserted-by":"crossref","first-page":"122","DOI":"10.1016\/j.jmr.2014.04.001","article-title":"An eight-channel transmit\/receive array of TE 01 mode high permittivity ceramic resonators for human imaging at 7T","volume":"243","author":"S Aussenhofer","year":"2014","journal-title":"Journal of Magnetic Resonance"},{"key":"ref11","article-title":"Decoupling of a tight-fit transceiver phased array for human brain imaging at 9.4T: Loop overlapping rediscovered","author":"NI Avdievich","year":"2017","journal-title":"Magnetic resonance in medicine"},{"issue":"3","key":"ref12","doi-asserted-by":"crossref","first-page":"153","DOI":"10.1002\/cmr.b.20067","article-title":"Image uniformity improvement for birdcage\u2010like volume coils at 400 MHz using multichannel excitations","volume":"29","author":"V Taracila","year":"2006","journal-title":"Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering"},{"issue":"2","key":"ref13","doi-asserted-by":"crossref","first-page":"327","DOI":"10.1002\/mrm.22527","article-title":"RF Excitation Using Time Interleaved Acquisition of Modes (TIAMO) to Address B(1) Inhomogeneity in High-Field MRI","volume":"64","author":"S Orzada","year":"2010","journal-title":"Magnetic Resonance in Medicine"},{"issue":"1","key":"ref14","doi-asserted-by":"crossref","first-page":"42","DOI":"10.1002\/cmr.b.20054","article-title":"Eigenmode analysis for understanding phased array coils and their limits","volume":"29B","author":"SB King","year":"2006","journal-title":"Concept Magn Reson B"},{"issue":"5","key":"ref15","doi-asserted-by":"crossref","first-page":"1346","DOI":"10.1002\/mrm.22295","article-title":"Optimum SNR Data Compression in Hardware Using an Eigencoil Array","volume":"63","author":"SB King","year":"2010","journal-title":"Magnet Reson Med"},{"issue":"1","key":"ref16","doi-asserted-by":"crossref","first-page":"160","DOI":"10.1016\/j.jmr.2006.06.015","article-title":"Potential advantage of higher-order modes of birdcage coil for parallel imaging","volume":"182","author":"C Wang","year":"2006","journal-title":"J Magn Reson"},{"key":"ref17","article-title":"Tic Tac Toe: Highly-Coupled, Load Insensitive Tx\/Rx Array and a Quadrature Coil Without Lumped Capacitors","author":"TS Ibrahim","year":"2008","journal-title":"Intl Soc Mag Reson Med"},{"key":"ref18","article-title":"Towards Homogenous 7T Neuro Imaging: Findings and Comparisons between 7T TTT and NOVA RF Coil Systems","author":"ST Ibrahim T","year":"2017"},{"key":"ref19","article-title":"On the E-field construction\/deconstruction and B1+ Efficiency\/Homogeneity with Transmit Array Eigen Modes","author":"Y Zhao","year":"2014"},{"key":"ref20","article-title":"Development of a 7 T RF coil system for breast imaging","author":"J Kim","year":"2016","journal-title":"NMR in biomedicine"},{"key":"ref21","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1016\/j.jmr.2016.04.012","article-title":"Experimental and numerical analysis of B1+ field and SAR with a new transmit array design for 7T breast MRI","volume":"269","author":"J Kim","year":"2016","journal-title":"J Magn Reson"},{"key":"ref22","article-title":"Ibrahim, TS. In-vivo (8x4) 32-ch Tx-only Body Array for UHF MR","author":"S Raval","year":"2017"},{"key":"ref23","article-title":"A new RF coil for foot and ankle imaging at 7T MRI","author":"T Santini","year":"2017"},{"key":"ref24","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.mri.2017.09.005","article-title":"A new RF transmit coil for foot and ankle imaging at 7T MRI","volume":"45","author":"T Santini","year":"2018","journal-title":"Magn Reson Imaging"},{"key":"ref25","article-title":"Dual optimization method of radiofrequency and quasistatic field simulations for reduction of eddy currents generated on 7T radiofrequency coil shielding","author":"Y Zhao","year":"2014","journal-title":"Magnetic resonance in medicine"},{"issue":"9","key":"ref26","doi-asserted-by":"crossref","first-page":"927","DOI":"10.1002\/nbm.1406","article-title":"Understanding and manipulating the RF fields at high field MRI","volume":"22","author":"TS Ibrahim","year":"2009","journal-title":"Nmr Biomed"},{"key":"ref27","first-page":"1193","article-title":"A Complete Modeling System with Experimental Validation for Calculating the Transmit and Receive Fields, Total Power Deposition, Input Impedance, and Coupling between Coil Elements","author":"Y-K Hue","year":"2008"},{"issue":"1","key":"ref28","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1002\/cmr.b.20185","article-title":"Studies of RF Shimming Techniques with Minimization of RF Power Deposition and Their Associated Temperature Changes","volume":"39B","author":"L Tang","year":"2011","journal-title":"Concepts Magn Reson Part B Magn Reson Eng"},{"issue":"11","key":"ref29","doi-asserted-by":"crossref","first-page":"e77759","DOI":"10.1371\/journal.pone.0077759","article-title":"Studies in RF Power Communication, SAR, and Temperature Elevation in Wireless Implantable Neural Interfaces","volume":"8","author":"Y Zhao","year":"2013","journal-title":"PloS one"},{"issue":"7","key":"ref30","doi-asserted-by":"crossref","first-page":"e103945","DOI":"10.1371\/journal.pone.0103945","article-title":"Implanted miniaturized antenna for brain computer interface applications: analysis and design","volume":"9","author":"Y Zhao","year":"2014","journal-title":"PloS one"},{"issue":"12","key":"ref31","doi-asserted-by":"crossref","first-page":"1768","DOI":"10.1002\/nbm.3582","article-title":"Ultra-high-field RF coil development for evaluating upper extremity imaging applications","volume":"29","author":"SB Raval","year":"2016","journal-title":"NMR in biomedicine"},{"key":"ref32","article-title":"-vivo (8x4) 32-ch Tx-only Body Array for UHF MR","author":"S Raval","year":"2017"},{"issue":"2","key":"ref33","doi-asserted-by":"crossref","first-page":"N23","DOI":"10.1088\/0031-9155\/55\/2\/N01","article-title":"The Virtual Family\u2014development of surface-based anatomical models of two adults and two children for dosimetric simulations","volume":"55","author":"A Christ","year":"2010","journal-title":"Physics in medicine and biology"},{"key":"ref34","article-title":"Using a mode concept to reduce hardware needs for multichannel transmit array","author":"M Vester","year":"2006"},{"key":"ref35","article-title":"SAR Simulations &amp; Safety","author":"TM Fiedler","year":"2017","journal-title":"Neuroimage"},{"key":"ref36","first-page":"547","article-title":"Analysis of RF transmit performance for a 7T dual row multichannel MRI loop array","volume":"2011","author":"M Kozlov","year":"2011","journal-title":"Annual International Conference of the IEEE Engineering in Medicine and Biology Society IEEE Engineering in Medicine and Biology Society Annual Conference"},{"key":"ref37","article-title":"7T: Physics, safety, and potential clinical applications","author":"O Kraff","year":"2017","journal-title":"J Magn Reson Imaging"},{"key":"ref38","article-title":"A 7 Tesla Gradient Mode Birdcage Coil for Improved Temporal and Occipital Lobe SNR","author":"G. C. Wiggins OK","year":"2006"},{"issue":"4","key":"ref39","doi-asserted-by":"crossref","first-page":"1033","DOI":"10.1002\/mrm.23081","article-title":"Time-interleaved acquisition of modes: an analysis of SAR and image contrast implications","volume":"67","author":"S Orzada","year":"2012","journal-title":"Magnetic resonance in medicine"},{"key":"ref40","article-title":"Variable Power Combiner for a 7T Butler Matrix Coil Array","volume":"397","author":"P Yazdanbakhsh","year":"2009"},{"key":"ref41","article-title":"A Simplified 16-channel Butler Matrix for Parallel Excitation with the Birdcage Modes at 7T","volume":"16","author":"V Alagappan","year":"2008","journal-title":"Proc Intl Soc Mag Reson Med"},{"issue":"2","key":"ref42","doi-asserted-by":"crossref","first-page":"544","DOI":"10.1016\/j.jmr.2011.09.023","article-title":"A k-space analysis of small-tip-angle excitation","volume":"213","author":"J Pauly","year":"2011","journal-title":"Journal of magnetic resonance"},{"issue":"6","key":"ref43","doi-asserted-by":"crossref","first-page":"1422","DOI":"10.1002\/mrm.21739","article-title":"Slice-selective RF pulses for in vivo B1+ inhomogeneity mitigation at 7 tesla using parallel RF excitation with a 16-element coil","volume":"60","author":"K Setsompop","year":"2008","journal-title":"Magnetic resonance in medicine"},{"issue":"1","key":"ref44","doi-asserted-by":"crossref","first-page":"144","DOI":"10.1002\/mrm.10353","article-title":"Transmit SENSE","volume":"49","author":"U Katscher","year":"2003","journal-title":"Magnetic resonance in medicine"},{"issue":"7","key":"ref45","doi-asserted-by":"crossref","first-page":"815","DOI":"10.1002\/nbm.1627","article-title":"A radiofrequency coil to facilitate B-1(+) shimming and parallel imaging acceleration in three dimensions at 7 T","volume":"24","author":"KM Gilbert","year":"2011","journal-title":"NMR in biomedicine"},{"key":"ref46","article-title":"A 16-channel dual-row transmit array in combination with a 31-element receive array for human brain imaging at 9.4 T","author":"G Shajan","year":"2013","journal-title":"Magnetic resonance in medicine"},{"issue":"2\u20134","key":"ref47","doi-asserted-by":"crossref","first-page":"483","DOI":"10.1007\/s00723-011-0280-y","article-title":"Transceiver-Phased Arrays for Human Brain Studies at 7 T","volume":"41","author":"NI Avdievich","year":"2011","journal-title":"Applied Magnetic Resonance"},{"issue":"2","key":"ref48","doi-asserted-by":"crossref","first-page":"59","DOI":"10.1002\/cmr.b.20136","article-title":"A Rapidly Rotating RF Coil for MRI","volume":"35B","author":"A Trakic","year":"2009","journal-title":"Concept Magn Reson B"},{"issue":"4","key":"ref49","doi-asserted-by":"crossref","first-page":"1068","DOI":"10.1109\/TBME.2012.2182993","article-title":"Electromechanical Design and Construction of a Rotating Radio-Frequency Coil System for Applications in Magnetic Resonance","volume":"59","author":"A Trakic","year":"2012","journal-title":"Ieee Transactions on Biomedical Engineering"},{"issue":"1","key":"ref50","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1002\/mrm.1910400107","article-title":"Spiral volume coil for improved RF field homogeneity at high static magnetic field strength","volume":"40","author":"DC Alsop","year":"1998","journal-title":"Magnetic Resonance in Medicine"},{"key":"ref51","article-title":"Antennas and Propagation &amp; USNC\/URSI National Radio Science Meeting","author":"M. Kozlov","year":"2015"},{"issue":"6","key":"ref52","doi-asserted-by":"crossref","first-page":"847","DOI":"10.1002\/mrm.1910400610","article-title":"SAR and B1 field distributions in a heterogeneous human head model within a birdcage coil","volume":"40","author":"CM Collins","year":"1998","journal-title":"Magnetic Resonance in Medicine"},{"issue":"1","key":"ref53","doi-asserted-by":"crossref","first-page":"46","DOI":"10.1002\/1522-2586(200007)12:1<46::AID-JMRI6>3.0.CO;2-D","article-title":"Sensitivity and Power Deposition in a High-Field Imaging Experiment","volume":"12","author":"DI Hoult","year":"2000","journal-title":"J Magn Reson Imaging"},{"issue":"10","key":"ref54","doi-asserted-by":"crossref","first-page":"1339","DOI":"10.1016\/S0730-725X(01)00404-0","article-title":"Effect of RF coil excitation on field inhomogeneity at ultra high fields: A field optimized TEM resonator","volume":"19","author":"TS Ibrahim","year":"2001","journal-title":"Magnetic resonance imaging"},{"issue":"1","key":"ref55","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1002\/cmr.b.20185","article-title":"Studies of RF Shimming Techniques with Minimization of RF Power Deposition and Their Associated Temperature Changes","volume":"39B","author":"L Tang","year":"2011","journal-title":"Concept Magn Reson B"},{"issue":"17","key":"ref56","doi-asserted-by":"crossref","first-page":"5429","DOI":"10.1088\/0031-9155\/52\/17\/022","article-title":"7 T body MRI: B-1 shimming with simultaneous SAR reduction","volume":"52","author":"B van den Bergen","year":"2007","journal-title":"Physics in medicine and biology"},{"issue":"3","key":"ref57","doi-asserted-by":"crossref","first-page":"577","DOI":"10.1002\/mrm.21149","article-title":"Simultaneous B-1(+) homogenization and specific absorption rate hotspot suppression using a magnetic resonance phased array transmit coil","volume":"57","author":"CAT Van den Berg","year":"2007","journal-title":"Magnetic Resonance in Medicine"}],"container-title":["PLOS ONE"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/dx.plos.org\/10.1371\/journal.pone.0206127","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2020,11,16]],"date-time":"2020-11-16T03:28:26Z","timestamp":1605497306000},"score":1,"resource":{"primary":{"URL":"https:\/\/dx.plos.org\/10.1371\/journal.pone.0206127"}},"subtitle":[],"editor":[{"given":"Peter","family":"Lundberg","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"editor"}]}],"short-title":[],"issued":{"date-parts":[[2018,11,27]]},"references-count":57,"journal-issue":{"issue":"11","published-online":{"date-parts":[[2018,11,27]]}},"URL":"https:\/\/doi.org\/10.1371\/journal.pone.0206127","relation":{},"ISSN":["1932-6203"],"issn-type":[{"value":"1932-6203","type":"electronic"}],"subject":[],"published":{"date-parts":[[2018,11,27]]}}}