Fiber Orientation Mapping Using Gradient Echo MRI: R2* Mapping Vs Frequency Difference Mapping

Keywords

addition adult amplification amplitude amplitudes angular animals anisotropy application approximately around astronomy axis brain brains carry coded coefficients comparing content correlated correlation correspondence create created creating curves dashed deconvolution dependence dependencies dependency developed development diameter diffusion displaying distortions echoes eddy empirical error evaluated evaluation example exhibit explaining exploiting expressed extracted fiber fibers field filtering find finding fits fitted fitting fixed forming fractional frequency future gradient hemispheres hours identified indicates inhomogeneity isotropic larger length like limitations linear linearly linked local locally long magnitude mapping maps measure nature noise occurs offsets orientation orientations originating parallel part periods perpendicular perspex phantom physics placed plots plotting pooling posed post predominantly previously problem produced projected quality rapid read recent reduced registered related relatively resolution respectively rotations sample samples scale scaled school sensitive sensitivity significantly sophisticated spherical spoiled strongly suffer sufficient suggests susceptibility tensor tissue uncertainty uncorrelated unit valuable variation varies vectors versus water yield yielded zero