A simple and fast adaptive nonlocal multispectral filtering algorithm for efficient noise reduction in magnetic resonance imaging

Magnetic Resonance Imaging
Mustapha BouhraraRichard G Spencer

Abstract

We recently introduced a multispectral (MS) nonlocal (NL) filter based on maximum likelihood estimation (MLE) of voxel intensities, termed MS-NLML. While MS-NLML provides excellent noise reduction and improved image feature preservation as compared to other NL or MS filters, it requires considerable processing time, limiting its application in routine analyses. In this work, we introduced a fast, simple, and robust filter, termed nonlocal estimation of multispectral magnitudes (NESMA), for noise reduction in multispectral (MS) magnetic resonance imaging (MRI). Through extensive simulation and in-vivo analyses, we compared the performance of NESMA and MS-NLML in terms of noise reduction and processing efficiency. Further, we introduce two simple adaptive methods that permit spatial variation of similar voxels, R, used in the filtering. The first method is semi-adaptive and permits variation of R across the image by using a relative Euclidean distance (RED) similarity threshold. The second method is fully adaptive and filters the raw data with several RED similarity thresholds to spatially determine the optimal threshold value using an unbiased criterion. NESMA shows very similar filtering performance as compared to MS-NLML, howe...Continue Reading

Citations

Aug 14, 2019·Journal of Neuroimaging : Official Journal of the American Society of Neuroimaging·Hanwen LiuCornelia Laule
Jan 14, 2022·Journal of Neuroimaging : Official Journal of the American Society of Neuroimaging·Ryan P BellNan-Kuei Chen

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