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Transmit to receive isolation of 115\u2009dB is achieved over a 1\u2009MHz bandwidth, with 120\u2009dB of isolation at the Larmor frequency. This was crucial to suppress unblanked RFPA noise. SWIFT images of the human wrist with 1.5\u2009mm isotropic resolution were acquired in less than 5\u2009min to demonstrate the utility of sodium SWIFT imaging at ultra\u2010high field. SWIFT imaging signal\u2010to\u2010noise ratio in a reference phantom with heterogeneous sodium concentrations was comparable to ultra\u2010short echo time imaging, which provided assurance that hardware had achieved the necessary specifications.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The feasibility of sodium SWIFT imaging at ultra\u2010high field was established, and a musculoskeletal imaging application was demonstrated. The success of this work enables further development of SWIFT at high and ultra\u2010high fields for imaging of sodium, proton, and other nuclei.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/mrm.70461","type":"journal-article","created":{"date-parts":[[2026,6,9]],"date-time":"2026-06-09T03:40:11Z","timestamp":1780976411000},"page":"1991-2003","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Sub\u2010Microsecond Switch Enabling\n                    <scp>\n                      SWIFT\n                      <sup>23<\/sup>\n                      Na\n                    <\/scp>\n                    Imaging at 10.\n                    <scp>5\u2009T<\/scp>"],"prefix":"10.1002","volume":"96","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1950-1828","authenticated-orcid":false,"given":"Russell L.","family":"Lagore","sequence":"first","affiliation":[{"name":"Center for Magnetic Resonance Research (CMRR) 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