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Title:
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Wavelet-based Rician noise removal for magnetic resonance imaging |
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Author:
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Nowak, Robert David
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Type:
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Journal Paper |
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Keywords:
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MRI; multiresolution; denoising |
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Citation:
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R. D. Nowak, "Wavelet-based Rician noise removal for magnetic resonance imaging," IEEE Transactions on Image Processing, vol. 8, no. 10, pp. 1408-1419, 1999. |
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Abstract:
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It is well-known that the noise in magnetic resonance magnitude images obeys a Rician distribution. Unlike additive Gaussian noise, Rician noise is signal-dependent and consequently spearating signal from noise is a difficult task. Rician noise is especially problematic in low signal-to-noise ration (SNR) regimes where it not only causes random fluctations, but also introduces a signal-dependent bias to the data that reduces image contrast. This paper studies wavelet-domain filtering methods for Rician noise removal. We derive a novel wavelet-domain filter that adapts to variations in both the signal and the noise. The new wavelet-domain filter reduces Rician noise contamination in both high and low SNR regimes. |
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Date Published:
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1999-10-20 |
