NITRC: PANDA: a pipeline tool for diffusion MRI: open-discussion

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Dimension problem

Dear，

I would like to know something about dimension of data.My raw data is 256*256*35.After some processes,we get a file named data.nii.gz,and the dimension is 151*173*41.So,could you give me some explanation?

RE: Dimension problem

Dear,

There are many non-brain voxel in the raw image.

To save the computer memory cost, we crop the image.

We acquire an image containing the brain exactly from the original image.

So the dimension of the image will be changed.

Best

Zaixu

RE: Dimension problem

Hello
Thanks for your reply.
I have two other questions.

First,'ProbabilisticMatrix.mat' should be symmetrical in theory,but what I got is unsymmetrical.Why?

Second, I want to read the .trk file to see the data structure?What should I do?

xuemei

RE: Dimension problem

Dear Xuemei,

The probabilisticMatrix.mat is indeed unsymmetrical,because the probability from ROI1 to ROI2 is not exectly the same as the probability from ROI2 to ROI1.

If you want to see the data structure of the .trk file, the following link is just for reference.
http://www.trackvis.org/docs/?subsect=fileformat

Best Regards,

Suyu

RE: Dimension problem

Dear suyu，

Thanks a lot！

xuemei