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Forum Diffusion Toolkit Usage Newbie question

Newbie question
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UserPost

10:32 am
July 27, 2010


Ish

New Member

posts 1
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1

First I commend you for your software, I have been looking for a tractography tool and I find it very user friendly. I have couple of question thought.

1. Is this a probabilistic or deterministic algorithm?

2. I tried changing the parameter" Orientation patch, Mask threshold,Angle thershold" put my tracks still look very wrong. 

3. I usually get my gradient table from converting my dicom to niftii using dcm2nii. Do I have to modify this file for DTK?

Thanks for the response 

Ish

1:21 pm
July 28, 2010


Ruopeng

Admin

posts 114
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Hi Ish,

To answer your questions one by one:

1. The alogrithm used in Diffusion Toolkits are all deterministic.

2. Can you post a screen shot and/or log text from DTK?

3. The bvec table pulled out of dicom header are localized vectors, while DTK takes the vectors in scanner coordinates. I just played a little bit with dcm2nii. If I use the bvec table it created, I had to apply 'invert z' to make tracks look right. Not sure why. I might investigate it further when I have time later on. Also you should uncheck 'oblique correction' even if your data is Siemens because the bvecs are the corrected ones.

Best,

Ruopeng

 
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