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The proposed processing was also applied on in vivo data and was demonstrated to improve visualization of flow data while preserving quantifications of flow data. ... In this work, we present a novel noise reduction processing for 4D flow MRI data using divergence-free wavelet transform. ... CONCLUSION Divergence-free wavelet denoising was shown to enhance the visual quality of 4D flow data and improve quantification of flow at aorta and pulmonary trunk. ...doi:10.1109/isbi.2013.6556692 dblp:conf/isbi/OngUTHAVL13 fatcat:acfxvj7g3zgifhp7jgbm3nbfn4