Keywords: Quantitative Imaging, Quantitative ImagingUltrashort echo time (uTE) T2* mapping of articular cartilage is sensitive to changes in components of cartilage with short T2* such as water bound to proteoglycans and collagen. T2* mapping requires acquiring multiple echoes and fitting the signal intensities to a monoexponential decay model to estimate a single T2*. We propose a ratio based proxy for T2*, the Free Water Index (FWI). Our exploratory study showed high correlations between the index and T2* in vivo, supporting the potential for our index to reduce scan time while retaining information from T2*.
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