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The images were processed with iterative decomposition of water and fat with echo asymmetry and least\u2010squares estimation to estimate the B<jats:sub>0<\/jats:sub> field map in the presence of fat. Then, the projection onto dipole field (PDF) algorithm was applied to acquire a local field map generated by tissues, followed by application of the morphology\u2010enabled dipole inversion (MEDI) algorithm to estimate a final susceptibility map. Three healthy volunteers and three hemophilic patients were recruited to evaluate the UTE\u2010QSM technique\u2019s ability to assess hemosiderin in the knee or ankle joint at 3T. One patient subsequently underwent total knee arthroplasty after the MR scan. The synovial tissues harvested from the knee joint during surgery were processed for histological analysis to confirm iron deposition.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>UTE\u2010QSM successfully yielded tissue susceptibility maps of joints in both volunteers and patients. Multiple regions with high susceptibility over 1 ppm were detected in the affected joints of hemophilic patients, while no localized regions with high susceptibility were detected in asymptomatic healthy volunteers. Histology confirmed the presence of iron in regions where high susceptibility was detected by UTE\u2010QSM.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The UTE\u2010QSM technique can detect hemosiderin deposition in the joint, and provides a potential sensitive biomarker for the diagnosis and prognosis of hemophilic arthropathy.<\/jats:p><\/jats:sec>","DOI":"10.1002\/mrm.28388","type":"journal-article","created":{"date-parts":[[2020,7,14]],"date-time":"2020-07-14T16:29:22Z","timestamp":1594744162000},"page":"3246-3255","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["Ultrashort echo time quantitative susceptibility mapping (UTE\u2010QSM) for detection of hemosiderin deposition in hemophilic arthropathy: A feasibility 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