Using the following snippet of code:
load MIP
imagesc((mip96+spm_project([2 2 2],[-67 -100 -42 ; 67 72 82; 0 0 0]',dims))');
axis image xy
I have just had a look, and get values of:
X:[-67, 67] or [-68, 68]
Y:[-100, 72]
Z:[-42,82]
I did realise there was something slightly wrong, in that the grids for the
transverse projection are not quite compatible with those for the coronal.
On further inspection, I noticed that I made a tiny error in the grid
separations in the left-right direction. On the transverse projection, the
grids are at positions: [22 39 56 73 90 107 123 140 157], whereas on the
coronal, they are at: [240 257 274 291 308 325 341 358 375]
In both of these, the grids are separated by 17mm, except one grid pair.
Best regards,
-John
On Thursday 12 July 2001 22:45, Robert Welsh wrote:
> Hi,
> I was wondering what the spatial limits were on the bounds of the boxes
> defining the glass brains (mm would be fine). I have tried to get out by
> draggin cursor about and looking at reported position I get something like
>
> X : [-66, 69]
> Y : [-100,72]
> Z : [-43 , 81]
>
> Now I believe the Y and Z, maybe I shouldn't, but I do note that X seems to
> be asymmetric (error maybe in the code?). I have done this by feeding
> spm_mip_ui a fake list of activations in an "image" that is 1mm on each
> side of the voxel. An error in the graphical stuff in some sense is
> tolerable, but I would appreciate the right answer as I am trying to put
> together a 3-d roi builder for the spm toolbox....
--
Dr John Ashburner.
Wellcome Department of Cognitive Neurology.
12 Queen Square, London WC1N 3BG, UK.
tel: +44 (0)20 78337491 or +44 (0)20 78373611 x4381
fax: +44 (0)20 78131420
http://www.fil.ion.ucl.ac.uk/~john
mail: [log in to unmask]
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