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. Author manuscript; available in PMC: 2009 Oct 5.
Published in final edited form as: IEEE Trans Med Imaging. 2008 Oct;27(10):1389–1403. doi: 10.1109/TMI.2008.920609

Fig. 2.

Fig. 2

Experiment with synthetic noise. MRI from Brainweb (Detail). (a) Original Image. (b) Image with Rician noise with σn = 10. (c) Gaussian filtered. (d) Conventional approach. (e) ML estimator. (f) EM method. (g) Koay’s method. (h) LMMSE estimator. (i) Recursive LMMSE (eight iterations). The LMMSE filters with correct noise estimation show the best performance, as confirmed by the numerical results in Table II.