Optic tract -single shell b =1000 and 64 directions

[Smith]

Dear Frank and other Experts,

In this group. let me know if anyone is doing visual tracts. Please suggest some relevant articles and connect with me. I am doubting whether there is any problem with my acquisition protocol. please see the protocol

TR=8643, TE=103.1, Flip angle =90, No of Averages=1, Slice thickness =2, slice spacing =3, voxel size=1x1, image rows and columns = 256x256, No of volumes :65, No of slices =42 and number of files = 2730

 I have done a single shell DTI with b=0 and 1000 and along 64 directions. I am not able to get the left and right optic tracts while selecting these regions' seeds. Initially, in the tracts column of the left optic tract, there were 172 tracts; after that, it went to the deleted column(see attached picture). Please provide some suggestions to rectify it.

[Frank Yeh]

The 3mm large slice spacing is not good for mapping optic pathways.

The ideal setting is to have 2mm isotropic resolution.

You may resample it to 2mm at Step T2 to see if it may help a bit.

Best

Frank

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