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Forum Diffusion Toolkit Usage Change of preset DSI matrices?

Change of preset DSI matrices?
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UserPost

1:45 am
May 8, 2010


Han

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posts 8
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Hi,

 

First, thanks for the nice application!

 

I am handling DSI data and I found that our data had different number of images from the number of images defined in those preset matrix. Is there any recent updates on selecting other matrices? Or, can we replace the matrix to others?

 

Anyway, I tried to open the matrix and it cannot be read from any texteditor.. Can I look at the matrix itself?

 

Thank you in advance!

 

 

 

12:04 pm
May 10, 2010


Ruopeng

Admin

posts 353
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Hi,

At this point, we will have to limit DSI reconstruction to our pre-defined gradient tables. The recon matrices are saved as binary file in float, if you want to look at it.

Here is the 514 DSI gradient table we use: dsi514.txt. I can upload 257 and 124 ones if you're interested.

Best,

Ruopeng

1:38 am
May 11, 2010


Han

Member

posts 8
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Thanks Ruopeng,

 

I thought if I can see the predefined matrix, I could use part of preset matrices (as shown in documentation..) However, it is totally different from what I have as a gradient table.

 

I think I can read those matrices and possibly save my table in a same format.

 

If I replace the preset table with mine, do you think odf_recon works with it?

 

If it does not work, what should I do?

 

 

Best,

Han

3:09 pm
May 11, 2010


Ruopeng

Admin

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I think you might have mixed up recon matrix and gradient table there. recon matrix was pre-calculated for a certain gradient table so the recon program would only need to do a simple and fast matrix multiplication from raw->odf. Assume you have N vectors (including b0) in your gradient table, the recon matrix should be a 181 x N matrix, which is saved in the recon matrix file. If you are able to come up with your own reconstruction matrix, you can save it in the same binary format and use it.

Ruopeng

1:26 am
May 12, 2010


Han

Member

posts 8
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Thanks for clarification.

 

Yes, I think I mixed with recon matrix and gradient table. Odf_recon is used for both HARDI and DSI and you provided hardi_mat for reconstruction method for HARDI. Can I use that program for DSI gradient table? Or could you tell me a paper which elaborate the method you generated preset DSI reconstruction matrix from a gradient table?

 

Thank you so much!

 

 

 

Best

Han

12:59 pm
May 14, 2010


Ruopeng

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6:49 pm
May 16, 2010


Han

Member

posts 8
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Thank you so much!

 

Best

Han
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