[Mristudio-users] fiber tracking after updating in Landmarker

[susumu]

Hi Julie,

When you got "white lines against black background", it's most likely a
wrong image matrix. Please make sure that you load the data as a "vector"
file. Also, after the normalization to ICBM-MNI, all image should be
181x217x181. So, if you got the vector file transformed correctly, you
should get this matrix size after you select "vector" as the file format.

There is one important issue, though. We don't recommend any transformation
of vector files. This is because vector transformation is very unstable. If
you want to do tracking after DTI image transformation, I strongly suggest
to use "tensor transformation", not FA and vector transformation.

This is simple. You need to open a tensor file using the "open .d" button.
Then you can apply the AIR transformation matrix.

Once your tensor is normalized to ICBM, your can read the transformed tensor
file to DtiStudio and recalculate all the FA, ADC, vector things.

Please let me know if you have further question.

Susumu

-----Original Message-----
From: mristudio-users-bounces at mristudio.org
[mailto:mristudio-users-bounces at mristudio.org] On Behalf Of JULIE E MCENTEE
Sent: Thursday, April 03, 2008 5:06 PM
To: mristudio-users at mristudio.org
Subject: [Mristudio-users] fiber tracking after updating in Landmarker

I normalised my Air.fa image to the ICBM-MNI-FA template using Landmarker. I
am now trying to do fiber tracking (whole brain) using the Updated_Air.fa
image in DtiStudio. The only way I was able to get DtiStudio to do the fiber
tracking was to normalise the eigenvectors (0, 1, 2) to the ICBM-MNI-FA
template in Landmarker, but then I am only able to load one 'updated'
eigenvector as the Principle Vector in DtiStudio. The result is some white
lines against black background.

What should I be doing here?

Thank you for your help!

Julie E. McEntee, M.A., C.C.R.P.
Senior Research Program Coordinator
Department of Psychiatry- Neuroimaging
Johns Hopkins University School of Medicine
600 N. Wolfe St./ Phipps 300
Baltimore, MD 21287
Phone: 410-502-0468
Fax: 410-614-3676
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