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Purpose: To evaluate the feasibility of a 3-minute b-tensor encoding protocolfor diffusion MRI-based assessment of the microscopic anisotropy and tissueheterogeneity in a wide range of intracranial tumors. Methods: B-tensorencoding was performed in 42 patients with intracranial tumors (gliomas,meningiomas, adenomas, metastases). Microscopic anisotropy and tissueheterogeneity were evaluated by estimating the anisotropic kurtosis ($MK_A$)and isotropic kurtosis ($MK_I$), respectively. An extensive imaging protocolwas compared with a faster 3-minute protocol. Results: The fast imagingprotocol yielded parameters with characteristics in terms of bias and precisionsimilar to the full protocol. Glioblastomas had lower microscopic anisotropythan meningiomas $(MK_A = 0.29 \pm 0.06$ versus $0.45\pm0.08, p = 0.003)$.Metastases had higher tissue heterogeneity $(MK_I = 0.57\pm0.07)$ than both theglioblastomas $(0.44\pm0.06, p < 0.001)$ and meningiomas $(0.46\pm0.06, p =0.03)$. Conclusion: Evaluation of the microscopic anisotropy and tissueheterogeneity in intracranial tumor patients is feasible in clinically relevanttimes frames.

Tensor-valued diffusion MRI in under 3 minutes: An initial survey of microscopic anisotropy and tissue heterogeneity in intracranial tumors