Hi - it is very important to visualize the activations for each
subject overlaid on that subject's structural (or at least that
subject's acitvation overlaid on standard space) if you have any
doubts about the reported coordinates (or even if you don't!). All
of these coordinates look probably reasonable to me as lying close to
visual areas.
Cheers, Steve.
On 31 Jul 2007, at 04:44, Gonzalo Rojas wrote:
> Hi:
>
> I have some fMRI visual studies (color circle paradigm)... I
> processed it and convert to the Standard Space (using "normal
> search" and 12 DOF options)... The coordinates of the Z-max of the
> main cluster of some of that studies is very different between each
> other: why ?...
>
> First control woman:
> Z-MAX | Z-MAX X | Z-MAX Y | Z-MAX Z | Z-COG X | Z-COG Y | Z-COG Z
> 8.84 | 2.15 | -95.3 | 3.81 | -0.119 | -80.3 | 1.14
>
> Second control woman:
> Z-MAX | Z-MAX X | Z-MAX Y | Z-MAX Z | Z-COG X | Z-COG Y | Z-COG Z
> 8.35 | -4.42 | -106 | -13.5 | 9.8 | -81.3 | -14.3
>
> Third control man:
> Z-MAX | Z-MAX X | Z-MAX Y | Z-MAX Z | Z-COG X | Z-COG Y | Z-COG Z
> 8.26 | -27.5 | -86.9 | -7.04 | 6.75 | -71.8 | 3.46
>
> I think that the coordinates of that voxels must be similar
> between each other because that voxels shows V1-V2 visual areas...
> Am I ok ?...
>
> I need an urgent answer, please....
>
> Sincerely
>
>
> Gonzalo Rojas Costa
> Laboratory of Medical Image Processing
> Department of Neuroradiology
> Institute of Neurosurgery Dr. Asenjo
> Jose Manuel Infante 553, Providencia, Santiago, Chile.
> Tel/Fax: 56-2-2003290
> Cel: 56-9-7771785
> www.neurorradiologia.cl
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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