Search Results for author: Peter J. Basser

Found 3 papers, 1 papers with code

A single-shot measurement of time-dependent diffusion over sub-millisecond timescales using static field gradient NMR

1 code implementation23 Dec 2020 Teddy X. Cai, Nathan H. Williamson, Velencia J. Witherspoon, Rea Ravin, Peter J. Basser

The method extends the Carr-Purcell-Meiboom-Gill (CPMG) cycle under a static field gradient by discretely incrementing the $\pi$-pulse spacings to simultaneously avoid off-resonance effects and probe a range of timescales ($50 - 500$ microseconds).

Director Field Analysis (DFA): Exploring Local White Matter Geometric Structure in diffusion MRI

no code implementations6 Jun 2017 Jian Cheng, Peter J. Basser

2) We propose Orientational Order (OO) and Orientational Dispersion (OD) indices to describe the degree of alignment and dispersion of a spherical function in a single voxel or in a region, respectively; 3) We also show how to construct a local orthogonal coordinate frame in each voxel exhibiting anisotropic diffusion; 4) Finally, we define three indices to describe three types of orientational distortion (splay, bend, and twist) in a local spatial neighborhood, and a total distortion index to describe distortions of all three types.

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