Post edited 9:43 am – June 15, 2011 by Koene Van Dijk

Let's see if I can wake up this thread:

Hi Ruopeng,

I'm having the same problem as the original poster but I have 124 direction DSI data and not 514.

1. Would you have the gradient table for a 124 direction DSI scan? 

2. You mentioned above "reconstruct your DSI data as DTI". Do you mean I should choose DTI in the gui? And what b0 value should I choose?

3. You said above: "Make sure to check 'multiple high b values' when you do that". Is that an option in the gui? I cannot find it.

Thanks,

Koene

PS: I'm using trackvis-0.4.4/bin/dtk on a linux box

Ruopeng:

thanks for the quick reply!

ah: I've updated the software and indeed now see the options you mentioned. It seems to work: I'm getting the "DTI" ouput files, such as FA map.

One thing: you said "set the b value which will be treated as the maximum b value in this case". To what should I set the b value? Default was 1000. Is that OK for this DSI_BCC124 protocol?

-Koene

forgive me my ignorance but I don't know what "the maximum b value for the DSI scan" is. Where can I find that?

-koene

Post edited 2:02 pm – June 17, 2011 by Koene Van Dijk

ah… Well, I do have the protocol from the Siemens scanner and it says this among others:

- – – – – – – – – – – – – – – – -

Diffusion mode MDDW

Diff. weightings 2

b-value 1 0 s/mm²

b-value 2 7000 s/mm²

Mosaic On

Noise level 20

Diff. directions 124

- – – – – – – – – – – – – – – – –

So I guess the answer to my questions is: 7000 ?

thanks!