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Segmentation of knee cartilage was carried out on T<jats:sub>1\u03c1<\/jats:sub> images. We used intraclass correlation coefficient to study the repeatability of segmentation in a subset of five children. We used the juvenile arthritis MRI scoring system to discriminate inflamed from non-inflamed knees. The Mann-Whitney <jats:italic>U<\/jats:italic> and Spearman correlation compared T<jats:sub>1\u03c1<\/jats:sub> between children with and without arthritis on MRI and correlated T<jats:sub>1\u03c1<\/jats:sub> with the juvenile arthritis MRI score.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>All children successfully completed the MRI examination. No images were excluded because of poor quality. Repeatability of T<jats:sub>1\u03c1<\/jats:sub> measurement had an intraclass correlation coefficient (ICC) of 0.99 (<jats:italic>P<\/jats:italic>&lt;0.001). We observed no structural cartilage damage and found no differences in T<jats:sub>1\u03c1<\/jats:sub> between children with (<jats:italic>n<\/jats:italic>=7) and without (<jats:italic>n<\/jats:italic>=6) inflamed knees (37.8\u00a0ms vs. 31.7\u00a0ms, <jats:italic>P<\/jats:italic>=0.20). However, we observed a moderate correlation between T<jats:sub>1\u03c1<\/jats:sub> values and the juvenile arthritis MRI synovitis score (r=0.59, <jats:italic>P<\/jats:italic>=0.04).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>This pilot study suggests that T<jats:sub>1\u03c1<\/jats:sub> is a feasible and repeatable quantitative imaging technique in children. T<jats:sub>1\u03c1<\/jats:sub> values were associated with the juvenile arthritis MRI synovitis score.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00247-019-04557-4","type":"journal-article","created":{"date-parts":[[2019,11,9]],"date-time":"2019-11-09T06:03:20Z","timestamp":1573279400000},"page":"371-379","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["T1\u03c1-mapping for assessing knee joint cartilage in children with juvenile idiopathic arthritis \u2014 feasibility and repeatability"],"prefix":"10.1007","volume":"50","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0123-8462","authenticated-orcid":false,"given":"Anouk M.","family":"Barendregt","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valentina","family":"Mazzoli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. 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