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The heels of twenty\u2010six\u00a0PsA patients (age 59\u2009\u00b1\u200915\u2009years, 41% female) and twenty\u2010seven asymptomatic volunteers (age 33\u2009\u00b1\u200911\u2009years, 47% female) were scanned in the sagittal plane with UTE\u2010T1 and UTE\u2010MT modeling sequences on a 3\u2010T clinical scanner. UTE\u2010T1 and macromolecular proton fraction (MMF; the main outcome of MT modeling) were calculated in the tensile portions of the Achilles tendon and at the enthesis (close to the calcaneus bone). Mann\u2013Whitney\u2010U tests were used to examine statistically significant differences between the two cohorts. UTE\u2010T1 in the entheses was significantly higher for the PsA group compared with the asymptomatic group (967\u2009\u00b1\u2009145 vs. 872\u2009\u00b1\u2009133\u2009ms, <jats:italic>p<\/jats:italic>\u00a0&lt;\u20090.01). UTE\u2010T1 in the tendons was also significantly higher for the PsA group (950\u2009\u00b1\u2009145 vs. 850\u2009\u00b1\u2009138\u2009ms, <jats:italic>p<\/jats:italic>\u00a0&lt;\u20090.01). MMF in the entheses was significantly lower in the PsA group compared with the asymptomatic group (15%\u2009\u00b1\u20093% vs. 18%\u2009\u00b1\u20093%, <jats:italic>p<\/jats:italic>\u00a0&lt;\u20090.01). MMF in the tendons was also significantly lower in the PsA group compared with the asymptomatic group (17%\u2009\u00b1\u20094% vs. 20%\u2009\u00b1\u20095%, <jats:italic>p<\/jats:italic>\u00a0&lt;\u20090.01). Percentage differences in MMF between the asymptomatic and PsA groups (\u221216.6% and \u221215.0% for the enthesis and tendon, respectively) were higher than the T1 differences (10.8% and 11.7% for the enthesis and tendon, respectively). The results suggest higher T1 and lower MMF in the Achilles tendons and entheses in PsA patients compared with the asymptomatic group. This study highlights the potential of UTE\u2010T1 and UTE\u2010MT modeling for quantitative evaluation of entheses and tendons in PsA patients.<\/jats:p>","DOI":"10.1002\/nbm.5040","type":"journal-article","created":{"date-parts":[[2023,9,23]],"date-time":"2023-09-23T03:29:26Z","timestamp":1695439766000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Achilles tendon and enthesis assessment using ultrashort echo time magnetic resonance imaging (UTE\u2010MRI) T1 and magnetization transfer (MT) modeling in psoriatic arthritis"],"prefix":"10.1002","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8815-4535","authenticated-orcid":false,"given":"Dina","family":"Moazamian","sequence":"first","affiliation":[{"name":"Department of Radiology University of California  San Diego California 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