AUTHOR=Canales-Rodríguez Erick J. , Tax Chantal M. W. , Fischi-Gomez Elda , Jones Derek K. , Thiran Jean-Philippe , Rafael-Patiño Jonathan TITLE=A diffusion MRI model for random walks confined on cylindrical surfaces: towards non-invasive quantification of myelin sheath radius JOURNAL=Frontiers in Physics VOLUME=13 YEAR=2025 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2025.1516630 DOI=10.3389/fphy.2025.1516630 ISSN=2296-424X