{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,21]],"date-time":"2025-10-21T15:06:28Z","timestamp":1761059188987,"version":"3.37.3"},"reference-count":34,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2011,2,24]],"date-time":"2011-02-24T00:00:00Z","timestamp":1298505600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"crossref","award":["U01 AR-06-006"],"award-info":[{"award-number":["U01 AR-06-006"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Magnetic Resonance in Med"],"published-print":{"date-parts":[[2011,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Magnetic resonance imaging analysis of knee cartilage properties at corresponding anatomic locations could be a valuable tool in studies of knee osteoarthritis by enabling accurate comparisons at practically any region. A technique of this kind is presented in this study. The proposed technique is based on gray\u2010level bone matching using affine transformations and free\u2010form deformations thus eliminating the need of bone segmentations and landmark matching. Sixteen subjects of the osteoarthritis initiative with knee osteoarthritis (10 from baseline; 6 from 24\u2010month follow\u2010up) were included in this study. Baseline subjects were used to create a gray\u2010level atlas of the patella with its corresponding mean cartilage thickness and <jats:italic>T<\/jats:italic><jats:sub>2<\/jats:sub> maps. Follow\u2010up subjects were used to validate atlas\u2010based point\u2010to\u2010point cartilage comparisons. All registrations were qualitatively evaluated with fused gray\u2010level images of registered patellas. Quantitative evaluation was performed based on mean values of minimum Euclidean distances between matched bone\u2010cartilage interfaces. A mean distance of 0.554 mm was obtained between the subjects used to build the atlas, and a mean distance of 0.633 mm was found between the atlas and validation subjects. The technique can be applied to other anatomical regions and with other cartilage measures. Qualitative and quantitative results demonstrate the accuracy of the technique and warrant its application in larger cross\u2010sectional and longitudinal studies of osteoarthritis. 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