1. A non-transitory computer-accessible medium for determining an orientation distribution function, the computer-accessible medium including instructions thereon, wherein, when a computing arrangement executes the instructions, the computing arrangement is configured to perform procedures comprising: receiving data relating to at least one diffusion weighted image; determining a measure of a diffusional kurtosis as a function of the received data using a closed form solution procedure; and determining at least one orientation distribution function based on the measure of the diffusional kurtosis.