Rotation of b vecs values

diffusion
dicom

(Cécile Muller) #1

Operating system: MacOS
Slicer version: 4.10

Hello!

I have a problem with a probable rotation of the bvec of a diffusion image.

The tractography of the spine shows transversal fibers instead of vertical fibers.

Here is the anonymized DICOM, and the bval and bvec list.

Would you have an idea/a tool to be sure of the abnormal rotation, of the angle (only90° or not?) and how to put it right?

Thank you very much!

0 0 -1 -0.848999994794926 0.108000005569824 -0.884000003401043 0.00299999274444239 0.867999997653773 -0.798999996352505 0.162000009729939 -0.866000001271694 0.211999990772823 -0.0680000087934205 -0.550000005362803 0.434999995839884 0.599000007689314 0.525000000295743 0.599999993217631 -0.653000000591486 -0.207000000749215 0.412999993109192 0.436000008103354 -0.461999991384025 0.50300000481075 -0.82400000522479 -0.296999996559525 0.040000003134874

-0 -0 -9.85809433737272e-09 0.527999991630478 0.565000001064674 -0.345000008714555 -0.735999999970426 -0.237999991443174 0.369999992123383 0.987000001597011 -0.12900000853711 -0.935999997910084 -0.89200000067035 -0.544000005421952 -0.421999995711729 0.780000005904999 0.0300000051754994 -0.687999994085143 -0.0600000064373357 -0.0760000020406257 -0.698999995928607 0.822000004298129 0.87399999544556 0.488000004958621 -0.53000000812307 0.348999997072146 0.318000000394324

0 0 -3.03576608295941e-18 8.32667268468867e-17 -0.818 0.315 -0.677 -0.436 -0.475 1.38777878078145e-16 -0.483 -0.281 0.446 0.634 -0.795 -0.182 0.851 -0.409 0.755 0.975 0.584 0.366 -0.148 0.713 -0.202 -0.889 0.947

0 0 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600

Link for DICOM images: https://www.dropbox.com/sh/2gl7e5zd791bb9k/AAD7bJUZN8saARKKOQd8BHR2a?dl=0

Thanks a lot for your help!