title: lop-DWI: A Novel Scheme for Pre-Processing of Diffusion-Weighted Images in the Gradient Direction Domain.
abstract: We describe and evaluate a pre-processing method based on a periodic spiral sampling of diffusion-gradient directions for high angular resolution diffusion magnetic resonance imaging. Our pre-processing method incorporates prior knowledge about the acquired diffusion-weighted signal, facilitating noise reduction. Periodic spiral sampling of gradient direction encodings results in an acquired signal in each voxel that is pseudo-periodic with characteristics that allow separation of low-frequency signal from high frequency noise. Consequently, it enhances local reconstruction of the orientation distribution function used to define fiber tracks in the brain. Denoising with periodic spiral sampling was tested using synthetic data and in vivo human brain images. The level of improvement in signal-to-noise ratio and in the accuracy of local reconstruction of fiber tracks was significantly improved using our method.
authors: Centre for Advanced Imaging, The University of Queensland , Brisbane, QLD , Australia ; Queensland Brain Institute, The University of Queensland , Brisbane, QLD , Australia.
authors: Farshid
authors: F
authors: Sepehrband
authors: Centre for Advanced Imaging, The University of Queensland , Brisbane, QLD , Australia ; Queensland Brain Institute, The University of Queensland , Brisbane, QLD , Australia.
authors: Jeiran
authors: J
authors: Choupan
authors: Section of Biomedical Image Analysis, Department of Radiology, University of Pennsylvania , Philadelphia, PA , USA.
authors: Emmanuel
authors: E
authors: Caruyer
authors: Centre for Advanced Imaging, The University of Queensland , Brisbane, QLD , Australia.
authors: Nyoman D
authors: ND
authors: Kurniawan
authors: School of Information Technology and Electrical Engineering, The University of Queensland , Brisbane, QLD , Australia.
authors: Yaniv
authors: Y
authors: Gal
authors: Centre for Advanced Imaging, The University of Queensland , Brisbane, QLD , Australia.
authors: Quang M
authors: QM
authors: Tieng
authors: Centre for Advanced Imaging, The University of Queensland , Brisbane, QLD , Australia.
authors: Katie L
authors: KL
authors: McMahon
authors: Centre for Advanced Imaging, The University of Queensland , Brisbane, QLD , Australia.
authors: Viktor
authors: V
authors: Vegh
authors: Centre for Advanced Imaging, The University of Queensland , Brisbane, QLD , Australia.
authors: David C
authors: DC
authors: Reutens
authors: Centre for Advanced Imaging, The University of Queensland , Brisbane, QLD , Australia ; School of Information Technology and Electrical Engineering, The University of Queensland , Brisbane, QLD , Australia.
authors: Zhengyi
authors: Z
authors: Yang
keywords: HARDI; diffusion-weighted imaging; gradient direction domain; local reconstruction; pre-processing; spiral sampling
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