An investigation into the minimum b-value necessary to characterize the fiber orientation density function (fODF) with fiber ball imaging (FBI) for white matter fiber tractography (WMFT) is presented. Using high angular resolution diffusion imaging (HARDI) data, we assessed the angular difference between principal directions across b-values using a high b-value benchmark, as well as the number of fiber crossings based on fODF peak detection. WMFT was performed using the reconstructed fODFs and was viewed qualitatively. Overall, the results indicated convergence near b = 4000 s/mm2 suggesting this to be the minimum b-value needed for FBI-WMFT.
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