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The functional dependence of the variance of Rician and non-central chi (nc-χ) distributed random variables M in terms of noise-free amplitude signal AT. Variance of nc-χ random variable additionally depends on the number of receiver coils L and underlying noise standard deviation which is fixed to σ = 1 in all cases. The symbol 1F1 indicates the confluent hypergeometric function of the first kind while Γ is the gamma function.
