[Neuroimaging] [DIPY] Comparing DIPY tensor fitting and other tools

[Tony Jiang]

Dear All,
A quick question about the fa maps created by DIPY (tensor model). I have a 64 direction DWI dataset and I processed this data using Diffusion Toolkit(DTK), FSL Diffusion toolbox (FDT) and DIPY. I used same gradient information and same masks for each tool. FDT and DTIK give me identical maps (except slight difference when these two apply the mask. I see some voxels having FA>1 on FDT result). DIPY gives a map very similar FA map compared to the other two FA maps I have.  Shouldn’t I get an exactly same map (within rounding error maybe). Anyone has similar experience? I have attached the screenshot showing the values read from 3 different FA maps.
The three maps do seem similar overall.
Any inputs?
Thanks,
Tony
[cid:894C9E85-3899-4E1F-BC75-380F4EB56A4B]

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