Abstract #1613

Fat Fraction and R2* as Measures of Bone Marrow Composition and Structure: Validation in Fat-Water-Bone Phantoms

Timothy JP Bray^1,2, Alan Bainbridge³, Shonit Punwani¹, Yiannis Ioannou², and Margaret A Hall-Craggs¹

¹Centre for Medical Imaging, University College London, London, United Kingdom, ²Centre for Adolescent Rheumatology, University College London, London, United Kingdom, ³Medical Physics, University College London Hospitals

MRI is becoming central to clinical decision-making in diseases involving the bone marrow, including spondyloarthritis and multiple myeloma. Both diseases cause alterations in marrow composition and structure, but there is currently no reliable method for quantifying these changes. Here, we describe a series of fat-water-bone phantoms enabling validation of proton density fat-fraction (PDFF) and R2* as measures of marrow composition and trabecular bone mineral density (BMD) respectively. Our data suggest that PDFF measurements can be achieved with excellent accuracy. Furthermore, there was a strong relationship between R2* and BMD, suggesting that R2* could be used to monitor BMD in vivo.

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