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:patricio.donne...@gmail.com]
Gesendet: Freitag, 20. Januar 2017 20:48
An: mitk-users@lists.sourceforge.net
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
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