Question

Question Posted 11/18/14:
I'm trying to get detailed information about the DTI scan parameters for the Effects of TBI & PTSD on Alzheimer's Disease in Vietnam Vets (ADNIDOD) Data, to which I've been granted access, but my repeated inquiries are only met with someone sending me a link to a page that does not contain the detailed information. Can someone please send me the full details of the scans? (scanner, b-values, diffusion directions, order of collection, etc, etc,...) Thanks.
Response posted 11/24/14 by ADNI MRI Core:
Thank you for your question to the ADNI MRI Core.

We apologize for the difficulty you are experiencing.


A good portion of the information you are inquiring about can be extracted from the DICOM headers of the images themselves. (Such as which scanner is used, the order of the images, b-values, etc. etc,...)

We have also provided some of this DTI scan information under previous user questions submitted to this board as well.

Below is the information on the DTI sequence itself that can also be found here: http://adni.loni.usc.edu/wp-content/uploads/2010/05/ADNI2_GE_3T_22.0_T2.pdf


SERIES 7. Axial DTI
Patient (RF)Coil: 8HRBRAIN
Scan Timing
TE: Minimum
TR: 9050.0
Imaging Scan plane: AXIAL
Mode: 2D
Pulse sequence: Spin Echo
Imaging Options: EPI, DIFF, Asset
Additional Parameters
User CVs
CV5: 1.00
CV9 :0.00
CV18: 0.00
Acquisition Timing Frequency
128: Phase: 128
phase field of view: 0.66
phase correct: Yes
swap phase & frequency: R/L
autoshim: Auto
Range / Prescription
field of view: 35.0
slice thickness:2.7
slice spacing: 0.0
number of slices: 59
ChemSAT = FAT
ASSET acceleration factor = 2
userCV5: Recon type = 1.00
userCV9: Shim volume mode = 0.00
userCV18: Enhanced fat suppression = 0.00
DWI Screen:
Diffusion direction = TENSOR
# of Diffusion directions = 41
# of T2 images = 5
Recon ALL images = checked ON
Optimized TE = checked ON
b-value = 1000
NEX = 1
Comments: Please do not oblique. Please do not reduce the number of slices.


DTI Directions Gradient Table listed below for both 59 and 41 directions.
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


We hope that this help address the issues you are having.


Thanks

ADNI MRI Core