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Apart from radiofrequency transmit inhomogeneities in the body at this field strength, imaging of the upper abdomen faces additional challenges associated with motion\u2010induced ghosting artifacts. To address these challenges, the goal of this work was to develop a technique for high\u2010resolution free\u2010breathing upper abdominal MRI at 7\u2009T with a large field of view. Free\u2010breathing 3D gradient\u2010recalled echo (GRE) water\u2010excited radial stack\u2010of\u2010stars data were acquired in seven healthy volunteers (five males\/two females, body mass index: 19.6\u201324.8\u2009kg\/m<jats:sup>2<\/jats:sup>) at 7\u2009T using an eight\u2010channel transceive array coil. Two volunteers were also examined at 3\u2009T. In each volunteer, the liver and kidney regions were scanned in two separate acquisitions. To homogenize signal excitation, the time\u2010interleaved acquisition of modes (TIAMO) method was used with personalized pairs of B<jats:sub>1<\/jats:sub> shims, based on a 23\u2010s Cartesian fast low angle shot\u00a0(FLASH) acquisition. Utilizing free\u2010induction decay navigator signals, respiratory\u2010gated images were reconstructed at a spatial resolution of 0.8\u2009\u00d7\u20090.8\u2009\u00d7\u20091.0\u2009mm<jats:sup>3<\/jats:sup>. Two experienced radiologists rated the image quality and the impact of B<jats:sub>1<\/jats:sub> inhomogeneity and motion\u2010related artifacts on multipoint scales. The images of all volunteers showcased effective water excitation and were accurately corrected for respiratory motion. The impact of B<jats:sub>1<\/jats:sub> inhomogeneity on image quality was minimal, underscoring the efficacy of the multitransmit TIAMO shim. The high spatial resolution allowed excellent depiction of small structures such as the adrenal glands, the proximal ureter, the diaphragm, and small blood vessels, although some streaking artifacts persisted in liver image data. In direct comparisons with 3\u2009T performed for two volunteers, 7\u2010T acquisitions demonstrated increases in signal\u2010to\u2010noise ratio of 77% and 58%. Overall, this work demonstrates the feasibility of free\u2010breathing MRI in the upper abdomen at submillimeter spatial resolution at a magnetic field strength of 7\u2009T.<\/jats:p>","DOI":"10.1002\/nbm.5180","type":"journal-article","created":{"date-parts":[[2024,5,22]],"date-time":"2024-05-22T04:34:10Z","timestamp":1716352450000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Free\u2010breathing high\u2010resolution respiratory\u2010gated radial stack\u2010of\u2010stars magnetic resonance imaging of the upper abdomen at 7\u2009T"],"prefix":"10.1002","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9697-2351","authenticated-orcid":false,"given":"Ivo T.","family":"Maatman","sequence":"first","affiliation":[{"name":"Department of Medical Imaging Radboud University Medical Center  Nijmegen the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jenni","family":"Schulz","sequence":"additional","affiliation":[{"name":"Department of Medical Imaging Radboud University Medical Center  Nijmegen the Netherlands"},{"name":"Erwin L Hahn Institute for MR Imaging  Essen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sjoerd","family":"Ypma","sequence":"additional","affiliation":[{"name":"Department of Medical Imaging Radboud University Medical Center  Nijmegen the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kai Tobias","family":"Block","sequence":"additional","affiliation":[{"name":"Department of Radiology NYU Langone Health  New York New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4410-6790","authenticated-orcid":false,"given":"Sebastian","family":"Schmitter","sequence":"additional","affiliation":[{"name":"Physikalisch\u2010Technische Bundesanstalt (PTB), Braunschweig  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John J.","family":"Hermans","sequence":"additional","affiliation":[{"name":"Department of Medical Imaging Radboud University Medical Center  Nijmegen the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ewoud J.","family":"Smit","sequence":"additional","affiliation":[{"name":"Department of Medical Imaging Radboud University Medical Center  Nijmegen the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marnix C.","family":"Maas","sequence":"additional","affiliation":[{"name":"Department of Medical Imaging Radboud University Medical Center  Nijmegen the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tom W. 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