Dear all,
After checking raw Diffusion-Tensor Imaging (DTI) data from some pilots, I noticed how systematically the first two directions show a b = 2150 in place of 2200.
Has it ever happened to any of you? If yes, do you have advice on how to solve it?
Thank you very much!
Edoardo
You don't mention which company your scanner is from. I don't know about other vendors, but with Siemens at least, the b-values saved in the DICOM files take into account the contributions from other gradients such as crushers, slice-selection, etc. So you see a distribution around the nominal b-value, depending on the direction of the diffusion weighting gradients. The b-value for your b=0 volumes, is probably something other than 0, as well.
Dear R. Allen Waggoner , thank you for your reply.
In my case, the scanner is Siemens. So, since I'm quite new with DTI analysis, what do you suggest to do/check?
Thank you very much
Is DTI definitely the model you are trying to fit to the diffusion images? I ask because typically DTI is fit to b-values closer to 1000. Many models/methods will be able to handle a difference of 50 in bvals without much extra consideration.
My issue seems to be solved thanks to the help of the MR physicist.
Thank you both guys for your replies.
Cheers!
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