2 Problems for Help.

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Nomad
Posts: 17
Joined: Tue Apr 01, 2008 3:56 am

2 Problems for Help.

Post by Nomad »

Hi experts of BV:
I have 2 big problems for help

1. As shown in the picture, how to deal with the poor sulci on the occipital and temporal lobes? (I have tried SPM for the RF correction, but it didnot work)
2. When "spatial normalized" into the Talairach Space, is there any warp (shape change) of the images?

These problems puzzled me for a long time:cry: .Thank you very much for the help!

Nomed
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Jean-Francois Mangin
Posts: 337
Joined: Mon Mar 01, 2004 10:24 am
Location: Neurospin, CEA, France
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Re: 2 Problems for Help.

Post by Jean-Francois Mangin »

Here is a trick that could improve your rendering, if the sulci are extracted correctly.
Basically, it will remove the sulci from the voronoi. Then you have to trigger again the
triangulation of the hemisphere.

VipSingleThreshold -i Lskeleton_subject -t 19 -c b -o Lskel
VipSingleThreshold -i Rskeleton_subject -t 19 -c b -o Rskel
VipExtEdge -i Lskel -m 3Da -o Lskele
VipExtEdge -i Rskel -m 3Da -o Rskele
VipMerge -i Lskel -o Lskel -m Lskele -v 0
VipMerge -i Rskel -o Rskel -m Rskele -v 0
VipMerge -i voronoi_subject -m Lskel -v 0 -o voronoi_mm36
VipMerge -i voronoi_subject -m Rskel -v 0 -o voronoi_mm36
rm Lskel.*
rm Rskel.*
rm Lskele.*
rm Rskele.*

Of course I wonder why your results are so bad, but this is another story...
Nomad
Posts: 17
Joined: Tue Apr 01, 2008 3:56 am

Re: 2 Problems for Help.

Post by Nomad »

Hi Mangin
Thank you for your reply very much. The reason maybe is a short TR/TE time (6.6/4.8). And there is a poor contrast between GM and WM. :shock:

And what the second question? Is there any warp or shape change of the image when normalized to the Tarailach Space?
:?:
Nomad
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Jean-Francois Mangin
Posts: 337
Joined: Mon Mar 01, 2004 10:24 am
Location: Neurospin, CEA, France
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Re: 2 Problems for Help.

Post by Jean-Francois Mangin »

Did you get better rendering?

The Talairach transformation in Anatomist is rigid body + 3 scale parameters in Talairach axes.
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