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Contemporary mid\u2010field systems (0.1 T\u20131.0\u2009T) show tremendous potential for imaging near metal implants. However, the limited parallel\u2010imaging options necessitate alternative methods for scan time reduction.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>We apply retrospective hexagonal undersampling to current state\u2010of\u2010the\u2010art SEMAC with 2\u2010fold generalized autocalibrating partially parallel acquisitions\u2013based parallel imaging at 0.55\u2009T. The hexagonal sampling approach results in an additional 50% scan time reduction. Feasibility is evaluated with phantom experiments involving spinal fixation and total hip arthroplasty hardware, and in vivo experiments involving patients with spinal fusions with varying compositions and 1 volunteer with a total hip arthroplasty.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Hexagonal sampling provides an additional 50% scan time reduction with compatible image quality. The two tradeoffs are (i) a small increase in signal void due to the loss of signal from one SEMAC spectral bin during post\u2010acquisition filtering and (ii) position\u2010dependent signal\u2010to\u2010noise\u2010ratio reduction at locations close to the edge of the field of view in the phase\u2010encoding direction.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>We demonstrate that hexagonal sampling can provide 50% scan time reduction in addition to generalized autocalibrating partially parallel acquisitions\/parallel imaging for SEMAC at 0.55\u2009T without introducing substantial artifacts. This may be a valuable mechanism for reducing scan time at 0.55\u2009T and other midfield strengths, where parallel\u2010imaging acceleration is limited.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/mrm.70077","type":"journal-article","created":{"date-parts":[[2025,10,3]],"date-time":"2025-10-03T06:52:58Z","timestamp":1759474378000},"page":"1098-1109","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Acceleration of slice encoding for metal artifact correction at 0.\n                    <scp>55\u2009T<\/scp>\n                    using hexagonal sampling"],"prefix":"10.1002","volume":"95","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6963-9644","authenticated-orcid":false,"given":"Bahad\u0131r Alp","family":"Barlas","sequence":"first","affiliation":[{"name":"Ming Hsieh Department of Electrical and Computer Engineering University of Southern California  Los Angeles California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4571-2813","authenticated-orcid":false,"given":"K\u00fcbra","family":"Keskin","sequence":"additional","affiliation":[{"name":"Ming Hsieh Department of Electrical and Computer Engineering University of Southern California  Los Angeles California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5267-9129","authenticated-orcid":false,"given":"Bochao","family":"Li","sequence":"additional","affiliation":[{"name":"Alfred E. Mann Department of Biomedical Engineering University of Southern California  Los Angeles California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian A.","family":"Hargreaves","sequence":"additional","affiliation":[{"name":"Electrical Engineering Stanford University  Stanford California USA"},{"name":"Radiology Stanford University  Stanford California USA"},{"name":"Bioengineering Stanford University  Stanford California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5735-3550","authenticated-orcid":false,"given":"Krishna S.","family":"Nayak","sequence":"additional","affiliation":[{"name":"Ming Hsieh Department of Electrical and Computer Engineering University of Southern California  Los Angeles California USA"},{"name":"Alfred E. Mann Department of Biomedical Engineering University of Southern California  Los Angeles California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,10,2]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.2106\/JBJS.OA.18.00007"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10067\u2010019\u201004811\u2010y"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.2106\/JBJS.17.01617"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.3899\/jrheum.170990"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.21037\/jss\u201020\u2010492"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1148\/rg.344140010"},{"key":"e_1_2_9_8_1","unstructured":"U.S. Food and Drug Administration.Information about soft tissue imaging and metal ion testing.https:\/\/www.fda.gov\/medical\u2010devices\/metal\u2010metal\u2010hip\u2010implants\/information\u2010about\u2010soft\u2010tissue\u2010imaging\u2010and\u2010metal\u2010ion\u2010testing. 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