Hello,
I am looking for the diffusion gradient vector table used to do DTI in ADNI-GO and ADNI2. Could you tell me where to find it or provide me with the list of diffusion encoding directions. As I understand there must be 41 vectors.
Many thanks.
Thank you for your question to the ADNI MRI Core.
DTI Directions Gradient Table listed below for both 59 and 41
59
1.000000 0.000000 0.000000
0.326000 0.945000 0.000000
-0.174000 0.660000 0.730000
0.828000 -0.561000 -0.011000
-0.257000 -0.672000 0.695000
-0.816000 -0.202000 0.542000
0.673000 0.095000 0.733000
-0.197000 0.934000 0.297000
0.897000 -0.121000 0.424000
0.035000 -0.997000 -0.065000
-0.197000 -0.923000 -0.329000
0.373000 -0.785000 -0.494000
-0.502000 -0.433000 0.748000
-0.724000 0.575000 0.381000
-0.445000 0.096000 -0.890000
-0.742000 -0.663000 -0.099000
0.505000 -0.240000 -0.829000
0.270000 -0.381000 -0.885000
-0.395000 -0.721000 -0.569000
-0.638000 0.760000 -0.126000
0.523000 0.806000 0.276000
-0.711000 0.218000 -0.669000
0.951000 -0.280000 0.134000
0.353000 0.515000 0.782000
-0.066000 -0.230000 -0.971000
0.407000 -0.913000 -0.033000
0.732000 -0.366000 -0.575000
0.068000 -0.099000 0.993000
-0.016000 0.831000 -0.555000
0.921000 0.366000 0.133000
-0.285000 0.356000 -0.890000
-0.232000 0.015000 0.972000
-0.346000 -0.260000 -0.901000
-0.454000 -0.161000 0.876000
-0.928000 0.306000 0.213000
-0.952000 -0.066000 0.300000
0.589000 -0.689000 0.422000
-0.587000 0.776000 0.231000
0.897000 0.188000 0.400000
-0.671000 -0.004000 0.742000
0.915000 0.352000 -0.199000
0.346000 -0.810000 0.473000
-0.490000 0.552000 0.675000
0.031000 0.815000 0.578000
0.811000 -0.437000 0.389000
-0.192000 -0.358000 0.914000
-0.758000 -0.608000 0.237000
0.849000 -0.130000 -0.512000
0.555000 -0.478000 0.682000
-0.276000 0.623000 -0.732000
-0.541000 -0.824000 0.167000
0.436000 0.775000 -0.457000
0.745000 0.529000 0.407000
-0.030000 -0.526000 -0.850000
0.644000 0.387000 0.660000
0.170000 -0.959000 0.229000
-0.682000 -0.509000 0.525000
0.161000 0.949000 -0.272000
-0.012000 0.542000 -0.840000
41
1.000000 0.000000 0.000000
0.798000 0.603000 0.000000
-0.264000 0.553000 0.790000
0.930000 -0.353000 -0.099000
-0.159000 -0.779000 0.607000
-0.565000 -0.099000 0.819000
0.537000 0.448000 0.715000
-0.545000 0.818000 -0.183000
0.755000 -0.240000 0.610000
-0.168000 -0.985000 0.040000
0.226000 -0.958000 -0.178000
0.112000 -0.829000 -0.548000
-0.503000 -0.495000 0.709000
-0.491000 0.767000 0.414000
-0.717000 -0.126000 -0.685000
-0.527000 -0.848000 -0.058000
0.746000 -0.475000 -0.467000
0.587000 -0.289000 -0.756000
-0.223000 -0.916000 -0.334000
-0.827000 0.494000 -0.270000
0.599000 0.683000 0.418000
-0.477000 0.337000 -0.812000
0.934000 -0.046000 0.354000
0.229000 0.703000 0.673000
-0.150000 0.298000 -0.943000
0.151000 -0.970000 0.192000
0.888000 -0.109000 -0.448000
0.104000 0.425000 0.899000
-0.237000 0.830000 -0.504000
0.690000 0.611000 -0.388000
-0.105000 0.609000 -0.786000
-0.002000 0.002000 1.000000
-0.394000 -0.108000 -0.913000
-0.251000 -0.327000 0.911000
-0.807000 -0.245000 0.537000
-0.931000 -0.322000 0.171000
0.561000 -0.624000 0.544000
-0.711000 0.693000 0.120000
0.871000 0.365000 0.329000
-0.274000 0.186000 0.944000
0.398000 0.851000 -0.342000