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Six HS (25\u201331\u2009years) and five AT patients (32\u201347\u2009years) participated. The study evaluates the clinical utility of the STFL sequence to generate T<jats:sub>1\u03c1<\/jats:sub> maps using mono\u2010exponential (ME) and bi\u2010exponential (BE) fitting models. In a phantom experiment, ME\u2010T<jats:sub>1\u03c1<\/jats:sub> values and SNR estimated from the STFL sequence are compared with those of the Cartesian turbo FLASH (CTFL) sequence. In human subjects, we evaluate differences in estimated ME (ME\u2010T<jats:sub>1\u03c1<\/jats:sub>) and BE parameters (short T<jats:sub>1\u03c1<\/jats:sub>, long T<jats:sub>1\u03c1<\/jats:sub>, and short fraction) between AT and HS groups along with repeatability of STFL. The agarose phantom demonstrates biases of 2.89% (3% agarose), \u22121.88% (5%), and \u22120.92% (7%) between ME\u2010T<jats:sub>1\u03c1<\/jats:sub> values from STFL and CTFL. In the bovine Achilles tendon, STFL shows a large bias of \u221258.6%, with a lower median ME\u2010T<jats:sub>1\u03c1<\/jats:sub> (2.9\u2009ms) than CTFL (4.6\u2009ms). SNR is higher in STFL (77.05\u201380.72 for 3%\u20137% agarose; 24.43 for bovine tendon) than CTFL (66.73\u201358.97 for agarose; 3.21 for bovine tendon). ME and BE parameters were averaged over the entire Achilles tendon, and none showed significant group differences (<jats:italic>p<\/jats:italic>\u2009&gt;\u20090.05; effect size\u2009=\u20090.05\u20130.22). Subregional analysis showed that in the mid\u2010Achilles tendon, short and long BE\u2010T<jats:sub>1\u03c1<\/jats:sub> components were 26% and 37% lower in AT than HS, though not statistically significant. The LDA\u2010combined BE parameter showed significant group separation in the midtendon region (<jats:italic>p<\/jats:italic>\u2009=\u20090.016; effect size\u2009=\u20091.53). In HS, the long BE\u2010T<jats:sub>1\u03c1<\/jats:sub> component showed subregional variation (<jats:italic>p<\/jats:italic>\u2009=\u20090.006), increasing 58% from calcaneal to midtendon, and then decreasing 23% toward the intramuscular region. ME and BE fitting showed high repeatability with scan\u2010rescan variations of 2.64% (T<jats:sub>1\u03c1<\/jats:sub>), 3.38% (short T<jats:sub>1\u03c1<\/jats:sub>), 3.0% (long T<jats:sub>1\u03c1<\/jats:sub>), and 0.21% (short fraction). We demonstrated the feasibility of using STFL for T<jats:sub>1\u03c1<\/jats:sub> quantification in the Achilles tendon.<\/jats:p>","DOI":"10.1002\/nbm.70149","type":"journal-article","created":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T07:52:31Z","timestamp":1759996351000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Feasibility of a UTE Stack\u2010of\u2010Spirals Sequence for T<sub>1\u03c1<\/sub> Mapping of Achilles Tendinopathy"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-5248-3126","authenticated-orcid":false,"given":"Anmol","family":"Monga","sequence":"first","affiliation":[{"name":"Department of Radiology New York University Grossman School of Medicine  New York New York USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6620-9814","authenticated-orcid":false,"given":"Hector\u00a0L.","family":"de 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