1. A method of processing magnetic resonance imaging signals from a plurality of magnetic resonance imaging coils, comprising:determining a noise covariance matrix, N, of a plurality of magnetic resonance imaging coils; receiving a corresponding plurality of signals, s&equals;(s 1, s 2, s 3,..., s n ) from the plurality of coils, wherein the plurality of signals represent a corresponding plurality of pixel values for a location; calculating a composite pixel value for the location, {square root}{square root over (&Scirc;)} t ·&Scirc; where &Scirc; t &equals;(K t −1 s) t, &Scirc;&equals;(K t −1 s) and N&equals;K t K.