Estimation of the noise in magnitude MR images.

@article{Sijbers1998EstimationOT,
  title={Estimation of the noise in magnitude MR images.},
  author={Jan Sijbers and Arnold J. den Dekker and Johan Van Audekerke and Marleen Verhoye and Dries Van Dyck},
  journal={Magnetic resonance imaging},
  year={1998},
  volume={16 1},
  pages={87-90}
}
Magnitude magnetic resonance data are Rician distributed. In this note a new method is proposed to estimate the image noise variance for this type of data distribution. The method is based on a double image acquisition, thereby exploiting the knowledge of the Rice distribution moments. 

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