Dear Thomas -
I think we are all ok in fmrib - thanks.
If you zoom in on a part of the maze, do the arrows line up
well?
T
On Fri, 8 Jul 2005, Thomas L. Arnow wrote:
> Hello,
> I hope all your collegues are safe after the attck in London. I have been
> running dtifit and get strange results with the eigenvectors, V1, V2, and
> V3. When first opening with fslview, the images appear speckled, black and
> white and gray. Changing to lines view, there is a very tight maze, all red.
> I am sure there is a problem with the data but I don't know how to debug it.
> I have attached bvectors and vals below.
>
> Thank you very much,
>
> Thomas L. Arnow
> Research Imaging Center,
>
> San Antonio, TX, USA
>
>
> dtifit -k datafixed.nii.gz -m nodif_brain_mask.nii -o dtiout -r bvecs87 -b
> bvals -V
>
>
> cat bvals
> 0 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700
> 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700
> 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700
> 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700 700
> 700 700 700 700 700 700 700 700 700 700 700
>
> bvecs =
>
> Columns 1 through 11
>
> 1.0000 0.0948 0.7748 -0.6567 0.0591 -0.5812 0.9225
> -0.7120 0.0245 -0.7993 -0.5334
> 0 0.5942 0.5537 0.7406 -0.1337 -0.8095 -0.0068
> 0.2392 -0.9348 -0.5331 0.6561
> 0 0.7987 -0.3051 0.1424 0.9893 -0.0837 0.3861
> -0.6601 0.3544 -0.2773 0.5339
>
> Columns 12 through 22
>
> 0.0422 -0.9827 -0.8213 -0.2360 -0.8696 0.1484 -0.7540
> -0.7640 0.4489 -0.8491 -0.5558
> 0.9747 0.1488 0.4311 -0.7813 0.4927 0.8254 0.5209
> -0.3935 -0.2976 -0.1208 0.7977
> 0.2196 0.1099 0.3735 0.5779 -0.0339 -0.5447 -0.4003
> 0.5114 -0.8425 -0.5142 -0.2340
>
> Columns 23 through 33
>
> 0.9310 -0.6273 -0.5690 0.6028 0.4068 0.7136 -0.8647
> 0.3949 0.8238 0.7254 0.1904
> -0.3600 0.3016 -0.0902 0.6302 0.0489 0.1989 0.0547
> -0.8591 -0.3701 0.6812 -0.7265
> 0.0594 0.7180 -0.8174 0.4893 0.9122 0.6717 0.4994
> 0.3256 0.4293 0.0990 0.6603
>
> Columns 34 through 44
>
> 0.1406 0.7376 0.2669 0.9122 -0.0581 -0.1177 0.3369
> -0.5724 -0.8190 0.4143 0.8559
> 0.9734 -0.0636 0.8070 0.1611 -0.5200 -0.7526 -0.3791
> -0.7360 -0.5619 0.8937 0.3741
> -0.1808 -0.6722 0.5268 -0.3767 0.8522 -0.6479 0.8619
> 0.3615 0.1162 0.1719 0.3571
>
> Columns 45 through 55
>
> -0.4734 -0.2255 0.5507 -0.2342 0.0906 -0.9669 0.4362
> 0.0031 -0.4703 -0.2298 -0.1422
> -0.7403 -0.0918 -0.5873 0.9671 -0.9957 -0.2067 0.4357
> 0.2679 0.6011 -0.9398 0.8108
> -0.4773 -0.9699 0.5931 -0.0990 -0.0169 -0.1494 0.7873
> -0.9634 -0.6461 -0.2528 0.5677
>
> Columns 56 through 66
>
> -0.3176 -0.6578 0.4606 -0.9483 0.2831 -0.2875 -0.6353
> 0.9324 -0.2256 0.7089 0.9118
> 0.1456 -0.4315 -0.8855 -0.2177 -0.6437 0.5087 -0.1044
> 0.3611 0.8538 -0.6777 -0.2359
> 0.9370 -0.6173 -0.0608 0.2309 -0.7109 0.8115 0.7652
> -0.0146 -0.4691 0.1951 -0.3360
>
> Columns 67 through 77
>
> 0.4944 0.6619 -0.3469 0.4499 0.6812 0.7712 -0.9397
> 0.1616 -0.3074 0.6794 -0.1009
> -0.7614 -0.1877 0.9018 0.1398 0.3405 -0.6051 0.1800
> -0.0826 -0.2320 -0.4542 0.6108
> -0.4193 0.7257 0.2576 -0.8821 -0.6481 -0.1977 -0.2908
> -0.9834 0.9229 -0.5762 -0.7853
>
> Columns 78 through 87
>
> 0.0623 -0.4712 0.1382 0.4917 0.0290 -0.3792 -0.3054
> 0.4975 -0.3413 0.2851
> 0.2546 -0.5162 -0.9066 0.6707 -0.4376 0.2878 -0.9397
> 0.8418 -0.4640 0.4949
> 0.9650 0.7152 -0.3987 -0.5554 -0.8987 -0.8794 0.1540
> -0.2096 -0.8175 -0.8208
>
> >>
>
--
-------------------------------------------------------------------------------
Tim Behrens
Centre for Functional MRI of the Brain
The John Radcliffe Hospital
Headley Way Oxford OX3 9DU
Oxford University
Work 01865 222782
Mobile 07980 884537
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