Automatically assigned DDC number: 6160754

Manually assigned DDC number: 0066

Number of references: 8

Title: Wavelet-Based Rician Noise Removal for Magnetic Resonance Imaging

Author:

Subject: Robert D. Nowak Wavelet-Based Rician Noise Removal for Magnetic Resonance Imaging

Description: 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 separating signal from noise is a difficult task. Rician noise is especially problematic in low signal-to-noise ratio (SNR) regimes where it not only causes random fluctuations, 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. I. Introduction In magnetic resonance imaging (MRI), there is an intrinsic trade-off between the signal-to-noise ratio (SNR), spatial resolution, and acquisition time required by the intended clinical/research application [1]. Therefore, given physiological or research paradig...

Contributor: The Pennsylvania State University CiteSeer Archives

Publisher: unknown

Date: 1998-03-04

Pubyear: 1998

Format: ps

Identifier: http://citeseer.ist.psu.edu/190838.html

Source: http://www.egr.msu.edu/~nowak/mri.ps.Z

Language: en

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Rights: unrestricted

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