I've done .5mm^3 in macaques, but that only had 700,000 voxels, which
is less than a human processed at 1.5mm.

Human data (assuming LR is 160mm, SI is 149mm, APis 193mm) yield ~1.2
million voxels @1.5mm or ~4.6million voxels @1mm isotropic resolution.

I'm not sure what the time trade off is for the higher resolution.

On Wed, Apr 22, 2009 at 6:17 PM, Jeff Browndyke <[log in to unmask]> wrote:
> I would add to Philipp's cogent response below that the simple
> calculation is complicated by the default voxel dimensions preferred by
> Dartel and most computers (i.e., 1.5 mm3).  This prompts me to ask...has
> anyone successfully run Dartel at 1mm3 voxel size output?
>
> Jeff
>
>
>
> ________________________________
>
> Jeffrey N. Browndyke, Ph.D.
> Duke University Medical Center
> 2200 West Main St., Suite A-200
> Durham, NC.  27705
> _________________________________
>
>
> -----Original Message-----
> From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]]
> On Behalf Of Saemann Philipp
> Sent: Wednesday, April 22, 2009 1:11 PM
> To: [log in to unmask]
> Subject: Re: [SPM] Relationship between probability maps and volume
>
> Hello,
>
> what you suggested as answer is basically true for the modulated GM
> images
> (i. e. images that have been produced by the segmentation algorithm or
> DARTEL
> with the modulation step switched on).
>
> Only the modulation step garantues the transition of the probability
> value
> to a volume value.
> Then, the resulting value of the voxel is - in practical terms -
> directly
> equivalent to a volume. A value of 1 in a voxel of
> 1x1x1 mm3 would (theoretically) be equivalent to 1 microliter.
>
> As lit. you could cite basic papers e. g. of John Ashburner on voxel
> based
> morphometry in general,
> or Unified Segmentation, or the diffeomorphic algorithm of DARTEL -
> depends, on what you did.
>
> All links to the literature you find on the SPM homepage & the
> respective
> sections.
>
> Hope this helps,
> Philipp
>
> Max Planck Institute of Psychiatry
> NMR Research Group
> Kraepelinstr. 2-10
> 80804 Munich
> Mail: [log in to unmask]
> Phone: 0049-89-30622-413
>

--
Best Regards, Donald McLaren
=====================
D.G. McLaren
University of Wisconsin - Madison
Neuroscience Training Program
Office: (608) 265-9672
Lab: (608) 256-1901 ext 12914
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