Thanks for the update!
I have a couple of questions. The 1st question is about the DSI sequence that we are considering. To recap, this is the sequence with 101 directions and a bval with multiple b value with a random-like distribution. Our physicist claims that this even distribution of b values avoids an 'overheating' effect (I am not sure this is the proper term, but that's what I understood) and this might make the sequence 'more stable'..? My major concerns are: 1. Will I be able to use REKINDLE (I read the paper which looks great.... Looking forward to tray it) with this sequence? 2. Thinking ahead, will this sequence allow me to employ CSD in a DKI framework in the future?
The 2nd question is about the network analysis. I was hoping to find some hints for these analyses in this new release. So, is there any other source that I could consider?
Thank you very much, Amelia
PS: Hope you had a great time at the conference! The program looked very interesting.
Thanks, Sjoerd !! This helps a lot, but I still need some inputs.
Is there a way to derive ‘optimized’ gradient tables for DTI/DKI sequences? Let’s say that I want to acquire a 3-shell sequence (b=1000, 2000 and 3000) with about 100 directions in a Siemens machine.
Many Thanks, Amelia
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Thank you so much!! Amelia
From: E_...@googlegroups.com [mailto:E_...@googlegroups.com]
On Behalf Of Alexander Leemans
Sent: Monday, June 02, 2014 6:45 PM
To: E_...@googlegroups.com
Subject: [E_DTI] Re: new sequence
Hi Amelia,
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Thank you so much, Chantal and Sjoerd !!
Actually I tried both tools and none of the two is generating what I was hoping.
The first tool (http://massive-data.org/methods/gradient-directions.html) actually gets closer to what I am looking for. It generates a 3 shell b-vector table, but it does not allow for more then 60 directions in each shell. Is there a physical reason why I cannot acquire more than 60 directions with multi-shell sequences?
The second tool (http://www.emmanuelcaruyer.com/q-space-sampling.php) generates a bvector table that looks more like a DSI table to me. Here is what I get:
#shell |
u_x |
u_y |
u_z |
3 |
0.652 |
-0.715 |
-0.254 |
2 |
-0.371 |
-0.008 |
-0.928 |
3 |
0.659 |
0.699 |
-0.277 |
3 |
0.427 |
0.205 |
0.881 |
2 |
0.928 |
-0.009 |
-0.371 |
3 |
0.235 |
-0.705 |
0.669 |
3 |
-0.565 |
0.077 |
0.822 |
1 |
-0.166 |
-0.936 |
-0.311 |
3 |
-0.971 |
-0.037 |
-0.234 |
2 |
-0.015 |
0.999 |
-0.046 |
3 |
0.147 |
0.872 |
0.467 |
3 |
-0.232 |
-0.414 |
0.88 |
2 |
0.74 |
0.597 |
0.312 |
3 |
-0.765 |
0.536 |
-0.356 |
3 |
-0.105 |
-0.986 |
0.131 |
2 |
0.389 |
-0.555 |
-0.735 |
3 |
0.149 |
-0.506 |
-0.85 |
3 |
-0.935 |
-0.142 |
0.326 |
2 |
0.19 |
0.628 |
-0.755 |
3 |
-0.702 |
-0.549 |
-0.453 |
3 |
-0.52 |
0.275 |
-0.809 |
1 |
0.966 |
-0.255 |
0.045 |
3 |
-0.372 |
0.927 |
-0.054 |
2 |
-0.782 |
0.584 |
-0.216 |
3 |
0.829 |
-0.325 |
-0.456 |
3 |
-0.331 |
-0.751 |
0.572 |
2 |
-0.234 |
-0.696 |
-0.679 |
3 |
0.025 |
-0.038 |
-0.999 |
3 |
-0.546 |
-0.821 |
-0.163 |
2 |
0.704 |
0.571 |
-0.422 |
3 |
0.319 |
-0.781 |
-0.537 |
3 |
0.798 |
0.047 |
0.6 |
2 |
0.873 |
-0.088 |
0.481 |
3 |
0.687 |
0.343 |
-0.64 |
3 |
-0.93 |
0.367 |
0.006 |
1 |
0.038 |
0.267 |
-0.963 |
3 |
0.323 |
0.589 |
0.741 |
2 |
0.356 |
0.031 |
-0.934 |
3 |
0.895 |
0.446 |
0.019 |
3 |
0.439 |
-0.803 |
0.403 |
2 |
-0.351 |
0.758 |
-0.549 |
3 |
-0.15 |
0.34 |
-0.928 |
3 |
-0.538 |
0.459 |
0.707 |
2 |
0.51 |
-0.816 |
-0.273 |
3 |
-0.081 |
0.977 |
0.197 |
3 |
-0.026 |
-0.88 |
0.474 |
2 |
-0.48 |
-0.876 |
0.043 |
3 |
-0.821 |
0.265 |
-0.507 |
3 |
-0.369 |
-0.133 |
0.92 |
1 |
-0.807 |
-0.52 |
0.279 |
3 |
0.993 |
-0.048 |
-0.106 |
2 |
-0.984 |
-0.166 |
-0.068 |
3 |
-0.431 |
-0.89 |
0.15 |
3 |
0.132 |
0.351 |
0.927 |
2 |
-0.009 |
-0.297 |
-0.955 |
3 |
0.699 |
-0.712 |
0.06 |
3 |
-0.659 |
-0.346 |
-0.668 |
2 |
0.816 |
-0.453 |
-0.36 |
3 |
-0.8 |
-0.008 |
0.6 |
3 |
0.436 |
0.776 |
0.455 |
2 |
0.335 |
-0.426 |
0.841 |
3 |
0.516 |
-0.544 |
0.662 |
3 |
-0.818 |
-0.455 |
0.351 |
1 |
-0.522 |
0.61 |
0.597 |
3 |
-0.054 |
0.737 |
0.673 |
2 |
0.011 |
-0.92 |
-0.393 |
3 |
-0.069 |
-0.636 |
0.769 |
3 |
0.894 |
0.324 |
0.308 |
2 |
0.663 |
0.222 |
-0.715 |
3 |
0.399 |
-0.88 |
-0.257 |
3 |
0.298 |
-0.235 |
-0.925 |
2 |
-0.674 |
-0.269 |
-0.688 |
3 |
-0.321 |
0.076 |
-0.944 |
3 |
0.51 |
0.558 |
-0.655 |
2 |
-0.168 |
-0.888 |
0.427 |
3 |
0.84 |
-0.488 |
-0.236 |
3 |
0.25 |
0.957 |
0.146 |
1 |
0.637 |
0.067 |
0.768 |
3 |
0.186 |
-0.942 |
0.28 |
2 |
0.476 |
-0.866 |
0.154 |
3 |
0.749 |
0.66 |
0.065 |
3 |
0.935 |
-0.253 |
0.25 |
2 |
0.658 |
-0.235 |
-0.715 |
3 |
0.611 |
-0.6 |
-0.517 |
3 |
0.616 |
-0.015 |
0.788 |
2 |
0.684 |
-0.381 |
0.622 |
3 |
0.099 |
0.204 |
-0.974 |
3 |
-0.974 |
-0.219 |
0.06 |
2 |
0.839 |
0.541 |
-0.061 |
3 |
0.292 |
0.886 |
-0.361 |
Is there something that I am doing wrong or that I am not considering?
Thanks again!! Amelia
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Thank you so much!!
Amelia
On Jun 4, 2014, at 9:10 AM, "Sjoerd Vos" <sjoer...@gmail.com<mailto:sjoer...@gmail.com>> wrote:
The gradient table you showed still has to be modified for the b-value. I know on GE and Philips this is impractical, not sure about Siemens.
The limit in the first tool to 60 gradient directions is probably an arbitrary one, likely based on excessive scantime when multiple shells are acquired with 60+ directions. The author (of the first tool) is a colleague of ours, so I'll ask and see if he can modify it to increase the upper limit. Will keep you updated.
Sjoerd
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Dear ExploreDTI experts,
I am having some issues when I create the .mat file with the new sequences that we are testing.
The DWIs look ok; however, the .mat file looks incomplete. I tried masking and w/o masking the dwi images, but I got the same results ( attached is the ‘fuse CV (I used DWIs) with FEFA’). Have you seen this before? Am I doing something wrong?
Not really relevant, but please note that I had the same issue with three sequences (all with 200 gradients+ 11 b0s) ran all on the same subject:
The 1st one with bmax=2500 (represented in the attachment), the 2nd one with b=3000 and the 3rd one with b=4000. (We were testing the effect of different b values).
Thanks a lot,
To view this discussion on the web visit https://groups.google.com/d/msgid/E_DTI/EC3487F5706D514EADE4F0995BD9AF472526DE92%40msxmbxnsprd17.acct.upmchs.net.
...
3
-0.331
-0.751
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