Fiber Data hub and MD value

[Tipakorn Tumnark]

Dear Prof. Frank,

I am using the NTU-90 dataset from the Fiber Data Hub, but I am unable to obtain the MD (Mean Diffusivity) values in DSI Studio. I assume this is because there is no DWI data available in the dataset. Am I correct in this assumption?

If so, do you have any suggestions on how I might obtain the MD data?

Thank you very much for your guidance.

Best regards,
Tipakorn

[Frank Yeh]

Hi Tipakorn,

The Fiber Data Hub .fz files may not include MD by default. This does not mean that MD cannot be obtained. You can use the corresponding .sz file to reconstruct a new .fz file and specify MD as an additional output.

For example, on the command line:

dsi_studio --action=rec --source=NTU90.sz --method=4 --other_output=md

This will generate a new .fz file that includes the MD map. After that, you can export MD from the .fz file:

dsi_studio --action=exp --source=NTU90.fz --export=md

The exported file will be saved as something like:

NTU90.fz.md.nii.gz

In short, please start from the .sz file, reconstruct the .fz while asking DSI Studio to output md, and then export the MD map from the newly generated .fz file.

Best,
Frank

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[tipakorn tumnark]

Dear Professor,

Thank you for the clear explanation. I appreciate your help and support
I’ll proceed it shortly.

Best regards,
Tipakorn