{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T14:55:09Z","timestamp":1791298509721,"version":"4.1.0"},"reference-count":28,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T00:00:00Z","timestamp":1789689600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T00:00:00Z","timestamp":1789689600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2023YFB3811400"],"award-info":[{"award-number":["2023YFB3811400"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["82371926"],"award-info":[{"award-number":["82371926"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Magnetic Resonance Imaging"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Knee MRI image quality depends largely on the radiofrequency coil; metasurfaces offer a new approach to improving coil performance.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>To evaluate the imaging performance and diagnostic capability of a metasurface coil for knee MRI.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Study Type<\/jats:title>\n                    <jats:p>Prospective.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Phantom\/Population<\/jats:title>\n                    <jats:p>A cylindrical phantom, 60 healthy volunteers (36 females; median age, 33), and 52 patients with knee injuries (28 females; median age, 47).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Field Strength\/Sequences<\/jats:title>\n                    <jats:p>T1 Weighted Spin Echo (T1W SE), Fat\u2010Saturated Proton Density\u2010Weighted Fast Spin\u2010Echo (FS PDW FSE), T1\u2010Weighted Gradient Recalled Echo (T1W GRE) at 1.5\u2009T.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Assessment<\/jats:title>\n                    <jats:p>All subjects underwent paired scanning with a wireless metasurface coil (plus built\u2010in spine array) and a commercial 12\u2010channel knee coil. Phantom metrics included signal\u2010to\u2010noise ratio (SNR), percent image uniformity (PIU), ghost\u2010to\u2010signal ratio, and B1 mapping. Volunteers were scored for image quality (5\u2010point), SNR, contrast\u2010to\u2010noise ratio (CNR), and handling convenience. Patients were assessed for ACL, meniscal, and cartilage injuries against arthroscopy.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Statistical Tests<\/jats:title>\n                    <jats:p>\n                      <jats:italic>T<\/jats:italic>\n                      \u2010test and Wilcoxon signed\u2010rank test for quantitative and semi\u2010quantitative data; McNemar test for diagnostic efficacy. Kendall's coefficient of concordance and kappa, with\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05 considered significant.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      In the phantom, SNR was 196.14 versus 183.34, PIU 92.47% versus 71.30%, and ghost\u2010to\u2010signal ratio 0.0093 versus 0.0145 (metasurface vs. commercial coil). Measured flip angle was 44.7\u00b0\u2009\u00b1\u20091.31\u00b0 (0.67% deviation from nominal 45\u00b0); B1 field uniformity was 91.14%. In volunteers, subjective image quality scores were slightly higher for the 12\u2010channel coil on FS PDW FSE (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05), whereas scores were comparable on T1W SE and 3D FS T1W GRE (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.06, 0.38). Convenience was markedly better for the metasurface (5.0 vs. 4.0,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05). In patients, diagnostic sensitivity (72.7%\u201383.3% vs. 72.7%\u201381.5%), specificity (86.7%\u201396.4% vs. 85.6%\u201396.4%), and accuracy (82.1%\u201390.4% vs. 81.4%\u201388.5%) were comparable between coils, inter\u2010coil kappa was 0.884\u20131.000.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>\u201cData\u201d Conclusion<\/jats:title>\n                    <jats:p>The wireless metasurface coil was more convenient and provided image quality and diagnostic performance comparable to the 12\u2010channel commercial knee coil at 1.5\u2009T.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Evidence Level<\/jats:title>\n                    <jats:p>2.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Technical Efficacy<\/jats:title>\n                    <jats:p>Stage 3.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/jmri.70551","type":"journal-article","created":{"date-parts":[[2026,9,19]],"date-time":"2026-09-19T06:45:51Z","timestamp":1789800351000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Diagnostic Performance of a Metasurface Coil Compared With a Commercial 12\u2010Channel Coil for Knee\n                    <scp>MRI<\/scp>\n                    at 1.\n                    <scp>5\u2009T<\/scp>"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-0945-7866","authenticated-orcid":false,"given":"Jie","family":"Gao","sequence":"first","affiliation":[{"name":"Department of Radiology, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine Tsinghua University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinxin","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, State Key Laboratory of 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