HARDI data denoising using vectorial total variation and logarithmic barrier

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May 2010, 4(2): 273-310. doi: 10.3934/ipi.2010.4.273

HARDI data denoising using vectorial total variation and logarithmic barrier

Yunho Kim ^1, , Paul M. Thompson ^2, and Luminita A. Vese ^3,

1.	Department of Mathematics, University of California, Irvine, Irvine, CA 92697-3875, United States
2.	Laboratory of Neuro Imaging and Department of Neurology, UCLA School of Medicine, Los Angeles, CA 90095-7334, United States
3.	Department of Mathematics, University of California, Los Angeles, Los Angeles, CA 90095-1555, United States

Received March 2009 Revised November 2009 Published May 2010

Abstract
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In this work, we wish to denoise HARDI (High Angular Resolution Diffusion Imaging) data arising in medical brain imaging. Diffusion imaging is a relatively new and powerful method to measure the three-dimensional profile of water diffusion at each point in the brain. These images can be used to reconstruct fiber directions and pathways in the living brain, providing detailed maps of fiber integrity and connectivity. HARDI data is a powerful new extension of diffusion imaging, which goes beyond the diffusion tensor imaging (DTI) model: mathematically, intensity data is given at every voxel and at any direction on the sphere. Unfortunately, HARDI data is usually highly contaminated with noise, depending on the b-value which is a tuning parameter pre-selected to collect the data. Larger b-values help to collect more accurate information in terms of measuring diffusivity, but more noise is generated by many factors as well. So large b-values are preferred, if we can satisfactorily reduce the noise without losing the data structure. Here we propose two variational methods to denoise HARDI data. The first one directly denoises the collected data $S$, while the second one denoises the so-called sADC (spherical Apparent Diffusion Coefficient), a field of radial functions derived from the data. These two quantities are related by an equation of the form $S = S_0\exp(-b\cdot sADC)$ (in the noise-free case). By applying these two different models, we will be able to determine which quantity will most accurately preserve data structure after denoising. The theoretical analysis of the proposed models is presented, together with experimental results and comparisons for denoising synthetic and real HARDI data.

Keywords: bounded variation, log barrier method., High angular resolution diffusion imaging, variational models, image restoration.

Mathematics Subject Classification: 35A15, 35J50, 35K10, 35Q92, 35Q93, 35R30, 49J40, 49J45, 49N45, 65K10, 65M06, 65M32, 68U1.

Citation: Yunho Kim, Paul M. Thompson, Luminita A. Vese. HARDI data denoising using vectorial total variation and logarithmic barrier. Inverse Problems & Imaging, 2010, 4 (2) : 273-310. doi: 10.3934/ipi.2010.4.273

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