Additionally, we acquired t2-weighted sagittal-oblique images (3.0, 0.9 mm gap) and t1-weighted transversal images (5, 1.0 mm gap).
Functional data were acquired with a single-shot gradient echo planar imaging sequence (matrix size: 64 × 64; resolution: 3.3 × 3.3 × 5 mm; 16 oblique transversal-coronal slices; slice thickness: 6 mm; slice gap: 1 mm; echo time TE: 35 ms; repetition time TR: 1500 ms; flip angle: 70°; receiver bandwidth: 2000 Hz/Px).
The smaller penetration for the narrower gap results in weaker ion focusing in the transversal directions, i.e., a wider area around the center that can be occupied by ions.
To provide an anatomical framework for analysis of the fMRI images, we obtained high-resolution anatomical images using a gradient-echo EPI imaging sequence (TR = 3000 ms; TE = 50 ms; matrix: 64 × 64), which created transversal whole-brain acquisitions (26 slices, 4 mm slice thickness, 0 mm interslice gap).
Alternatively, geometries with smaller interboard gaps produce a single, nonsplit ion packet extended in the transversal direction.
18 transversal slices were positioned along the AC-PC line (thickness 5 mm, 1.5 mm gap).
Slice thickness of t2-weighted images was 3.0 mm with a gap of 0.3 mm in sagittal orientation and 3 mm with 0.6 mm gap in transversal and coronal orientation.
fMRI images were acquired with an EPI pulse sequence using BOLD contrast: TR = 1.95 s, TE = 25 ms, α = 80°, 34 transversal slices in descending order, orientated axially parallel to the ac-pc line, thickness 3 mm (1 mm gap), FOV = 220 mm, voxel size 3.44×3.44×4 mm3.44×3.44×4
Each subject in Group 2 participated in a DTI measurement (1.8×1.8×2.2 mm voxels, no gap, TR = 6.8 sec, TE = 93 ms, FoV = 1782*1840, Flip Angle = 90°, 50 transversal slices, 64 diffusion directions, two averages, b-value = 1000 s/mm2) with the FoV comprising the full cerebrum and parts of the rostral cerebellum.
Given the above gaps in our understanding of these processes, here we reinvestigate the process of accretion by analyzing transversal cross sections of aggregates.
It should be multi-polar, with far more transversal transport – too much is still radial.
