[Mristudio-users] Fiber Tracking Saving Data Question

[susumu]

Hi Jason,

 

It seems that you had a common problem of Radiology-Neurology display
difference, which becomes an issue when you mix raw and Analyze formats.

 

As you can see, the axial image of "reloaded" is inverted. This happens when
you try to read images in the Neurology convention (left is left) to
DtiStudio that follows the Radiology convention (left is right). As long as
you stay with "raw" format within DtiStudio, this problem should not happen.
However, if you try to load and save Analyze format, it may happen because
the Analyze default is the Neurology convention. If you save image data by
the Analyze format through DtiStudio, make sure to reload the image (not the
fiber), by Analyze format so that DtiStudio knows what is happening and
correct it to Radiology. The fiber information in *.dat is always the
Radiology convention. 

 

So, first thing you have to do is to figure out the way to load your image
upright in axial slice.

 

Susumu

 

  _____  

From: mristudio-users-bounces at mristudio.org
[mailto:mristudio-users-bounces at mristudio.org] On Behalf Of Jason Stein
Sent: Wednesday, May 21, 2008 12:25 PM
To: DTI Studio, ROI Editor, Landmarker Questions/Support
Cc: Ilya Eckstein
Subject: [Mristudio-users] Fiber Tracking Saving Data Question

 

Hello,

I ran some fibertracking on a DTI set and am trying to get the corticospinal
tract.  As per "Automated Fibertracking of Human Brain White Matter Using
Diffusion Tensor Imaging", I placed seeds as follows, an cerebral peduncle
AND motor cortex NOT contralateral hemisphere NOT cerebellum.  After that I
got a bundle which corresponds very well to the corticospinal tract.  

Now, I saved this dataset in both the Amira's format and the .dat format.
When I reload the dataset into DTIstudio or using other code, it shows up in
the wrong place (a few voxels off from where it originally started).  I
attached a screenshot of this problem where you can see that in
OriginalFiberTract.jpg, the tract originates in the cerebral peduncle and in
the ReloadedFiberTract.jpg, the tract originates in a place slightly
posterior to the peduncle.  

Do you know why this happens and/or how we could fix it?

Thanks in advance for any help!
Jason

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