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This required the removal of the standard whole\u2010body gradient and radiofrequency coils. To achieve a coil efficiency ~4\u00d7 that of whole\u2010body gradients, a double\u2010layer primary coil design with asymmetric x\u2010y axes, and symmetric z\u2010axis was used. The use of all\u2010hollow conductor with direct fluid cooling of the gradient coil enabled \u226550 kW of total heat dissipation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      This design achieved a coil efficiency of 0.32 mT\/m\/A, allowing 200 mT\/m and 500 T\/m\/s for a 620 A\/1500 V driver. The gradient coil yielded substantially reduced echo spacing, and minimum repetition time and echo time. In high\n                      <jats:italic>b<\/jats:italic>\n                      = 10,000 s\/mm\n                      <jats:sup>2<\/jats:sup>\n                      diffusion, echo time\u00a0(TE) &lt; 50 ms was achieved (&gt;50% reduction compared with whole\u2010body gradients). The gradient coil passed the American College of Radiology tests for gradient linearity and distortion, and met acoustic requirements for nonsignificant risk operation.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Ultra\u2010high gradient coil performance was achieved for head imaging without substantial increases in gradient driver power in a whole\u2010body 3.0T magnet after removing the standard gradient coil. As such, any clinical whole\u2010body 3.0T MR system could be upgraded with 3\u20104\u00d7 improvement in gradient performance for brain imaging.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/mrm.28087","type":"journal-article","created":{"date-parts":[[2019,11,25]],"date-time":"2019-11-25T05:35:08Z","timestamp":1574660108000},"page":"2356-2369","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":136,"title":["Highly efficient head\u2010only magnetic field insert gradient coil for achieving simultaneous high gradient amplitude and slew rate at 3.0T (MAGNUS) for brain microstructure imaging"],"prefix":"10.1002","volume":"83","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9016-1005","authenticated-orcid":false,"given":"Thomas K. 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