based on GRE field maps. Preprocessed Nifti scans were prepared for 
tractography using DSI Studio via singularity container version Chen-
2022-07-31 (ref. 74). Diffusion images were converted to source code 
files using the DSI Studio command line ‘--action=src’ and a custom 
script to convert all images. The diffusion data were reconstructed in 
MNI space using q-space diffeomorphic reconstruction75 with a diffu-
sion sampling of 1.25 and output resolution of 1.8 mm isotropic. The 
following output metrics were specified to be included in the output 
FIB file: QA and mean diffusivity (MD). The quality and integrity of 
reconstructed images were assessed using ‘QC1: SRC Files Quality Con-
trol’ . First, the consistency of image dimension, resolution, DWI count 
and shell count was checked for each image. Second, each image was 
assessed for the ‘neighboring DWI correlation’ which calculates the 
correlation coefficient of low b DWI volumes that have similar gradi-
ent direction. Lower correlation values may indicate issues with the 
diffusion signal due to artifacts or head motion. Finally, DSI Studio