[MINC-users] average_305_headmask.mnc -- what is this?

[D. Louis Collins]

Christopher,

the headmask image is simply a mask of the target head skin surface.  
It is use in one of the intermediate steps of the non-linear fitting to 
define the tightest bounding box possible for the non-linear 
deformation.  The goal was to save computational time (and space) by 
not having an unneeded huge deformation field.

you can either
	1- use the standard headmask in the mni_autoreg model
	2- segment the head/skin of your target brain, resample it like your 
target image and that should do.

-Louis


On Apr 23, 2004, at 12:16 PM, Christopher wrote:

> Dear MINC-users
>
>   mritotal uses an image, "average_305_headmask.mnc" to normalize 
> scans to a (pseudo-) Talairach space -- could anyone tell me what that 
> is?  The other images, the blurred, the masked, those are clear, but 
> what is a "headmask" image?  Thanks.
>
> - cheers,
>       Christopher
>
> -- 
> ____________________________________ Christopher Currie
> Research Assistant/Programmer Department of Psychology, Neuroimaging 
> fMRI lab Columbia University 1190 Amsterdam Ave. New York, NY 10027
> Lab phone (temp): 212-854-1860 Email: 
> ccurrie@paradox.psych.columbia.edu
>
>
>
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