Low b-value DTI (Low-b DTI) has been recently proposed for investigating the CSF pseudorandom flow. High repeatability of Low-b DTI is essential for the investigation; however, an efficient index evaluating repeatability of both shape and orientation of DT has not been presented. In this study, a new index, angular tensor-correlation-coefficient (ATCC), was proposed and was demonstrated to have good features in understanding the degree of repeatability by Monte Carlo simulation. ATCC was used to evaluate the repeatability of an experiment about Low-b DTI of CSF and showed high repeatability of this experiment.
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