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Another alternative would be OrthoView
(http://nmr.mgh.harvard.edu/harvardagingbrain/People/AaronSchultz/OrthoView.html).
It can apply several different thresholds and has the ability to save
thresholded images.

Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Postdoctoral Research Fellow, GRECC, Bedford VA
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Website: http://www.martinos.org/~mclaren
Office: (773) 406-2464
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On Mon, Apr 16, 2012 at 12:07 PM, Franziska Korb
<[log in to unmask]> wrote:
> Hi Gao,
>
> in case Marko's solution doesn't work for you, here's another
> workaround... ;-) :
> You could use the xjview toolbox (http://www.alivelearn.net/xjview8/) to
> threshold the T-maps (or whatever maps you have) and then save the
> thresholded image which you can display in MRIcron. You might have to
> convert it from *.img to *.nii, but that's a quick step (in case you are
> not familiar with it), especially if you use the batch editor.
>
> Good luck,
> Franziska
>
>
> On 4/16/2012 11:51 AM, Marko Wilke wrote:
>>
>>  Hi Gao,
>>
>>  I only saw this today myself, so don't know how well it works, but you
>>  can try Draw, Advanced, Apply Cluster Threshold. You may then have to
>>  load the background image as an overlay, but hey ;) Otherwise, you can
>>  of course manipulate your image using spm_bwlabel and then use that
>>  "cleaned" result for overlays.
>>
>>  Cheers,
>>  Marko
>>
>>
>>  Gao wrote:
>>>
>>>  Sorry if this is not very relevant to SPM.
>>>  But anyone here know if it's possible to set a minimum cluster size
>>>  (# of
>>>  voxels) for overlays in MRIcron?
>>>  This was possible in MRIcro, yet I can't seem to find a similarly
>>>  functioning button (or command line reference) for it in MRIcron.
>>>  Thanks in Advance!
>>>  Gao
>>>
>>
>
> --
> Franziska M. Korb, Ph.D.
>
> Postdoctoral Associate (Egner Lab)
>
> Center for Cognitive Neuroscience
> LSRC Building, Room C03D, Research Dr
> Box 90999
> Duke University
> Durham, NC 27708
>
> phone: ++1-919-684.1034
>
> http://sites.google.com/site/egnerlab/