Question

Question Posted 11/05/15:
We downloaded the diffusion MRI data, specifically the preprocessed images. However, we have doubts about how to find the information about the diffusion gradients directions. We would like to reconstruct the diffusion tensor, for each subject, in order to perform fiber tractography reconstructions. That is why such information is relevant for us. We will really appreciate if you could provide us with that information.
Response posted 11/05/15 by ADNI MRI Core:
Thank you for your question to the ADNI MRI core.

This question has been asked and answered several times in the MRI Core Experts Knowledge based questions.



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

Thank you ADNI MRI