Hello Peter, I'm using the binaries in Ubuntu 14.04. The acquisition
parameters are the default ones:
Signal Scale: 100
TE: 100
Line Readout Time: 0.84
Time homogeneity relaxation: 50
Fiber Radious: 3
Values range are very limited (only one value between fiber voxels and
nonfiber voxels) in B0 and non B0 images. For each the ranges are:
*B0*
Nonfiber voxel: 189
Fiber Voxel: 190
*Non B0*
Nonfiber voxel: 70
Fiber Voxel: 71
Do I have to compile from source?
Thanks,
Patricio
2017-01-23 6:21 GMT-03:00 Neher, Peter <[email protected]>:
> Hi Patricio,
>
>
>
> you are talking about b0 intensities, right? 70 seems pretty low in
> general. What is your signal scale parameter? Maybe you set that to a value
> one order of magnitude higher.
>
>
>
> Your model parameters seem fine. In general, the shorter the echo time,
> the lower the contrast because there is not enough time for the signal to
> decay. How long is your echo time?
>
>
>
> Are you using the MITK Diffusion installer or did you build it yourself?
>
>
>
> Cheers,
>
> Peter
>
>
>
> *Von:* Patricio Donnelly Kehoe [mailto:[email protected]]
> *Gesendet:* Freitag, 20. Januar 2017 20:48
> *An:* [email protected]
> *Betreff:* [mitk-users] [Fiberfox] Low range of values in generated Nifti
> using Fiberfox
>
>
>
> Hello, I'm using Fiberfox to generate very simple fiber geometries and I
> keep getting Nifti files with very low range of intensities between fiber
> and non fiber voxels. I want to know if I'm doing anything wrong or if this
> behavior is expected.
>
> I have been playing around with the model values, but I can't get a big
> range of intensity values. For example, the difference between fiber and
> non fiber voxels is only one unit of intensity values (71 and 70).
>
> Maybe I'm configuring badly the parameters in the model configuration
> between intra-axonal, extra-axonal and extra-axonal compartments.
>
> *Intra-axonal values are:*
>
> T2-relaxation: 110 ; FA: 0.97
>
> *Inter-axonal values: *
>
> T2-relaxation: 110 ; FA: 0.97
>
> *Extra-axonal values (Ball-model): *
>
> T2-relaxation: 80
>
> If needed I can provide more information.
>
> Thanks,
>
>
> --
>
> Bioengineer Patricio Donnelly Kehoe
>
> PhD Student at CIFASIS - CONICET
>
> Multimedia Signal Processing Group - Neuroimage Division
>
> http://www.cifasis-conicet.gov.ar/
>
> Contact Number: +5493412164799
>
>
>
--
Bioing. Patricio Donnelly Kehoe
PhD Student at CIFASIS - CONICET
Multimedia Signal Processing Group - Neuroimage Division
http://www.cifasis-conicet.gov.ar/
Contact Number: +5493412164799
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