Re: [Freesurfer] scanner to RAS reslicing artifact?

I think it is true for FreeView, but Ruopeng would know for sure. As for the 12 channel, it might be that the data are acquired differently (slightly oblique to the scanner coordinates). doug

On 09/10/2012 11:32 AM, Andrew R. Dykstra wrote:

Thanks Doug. Is the same true of Freeview? And is it just coincidence that I haven't seen this with the 12-channel coil?

Andy

On Sep 10, 2012 5:16 PM, "Douglas N Greve" <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu> wrote:

This is just a display issue in tkmedit. tkmedit does not display an
image slice. Instead, it reslices the image so that the slices are
aligned with the scanner coordinates. This can lead to the lines you
see. They are nothing to worry about.
doug



On 09/10/2012 10:54 AM, Andrew R. Dykstra wrote:
> Hi all,
>
> I've sometimes noticed a strange reslicing artifact with MPRAGE data
> collected from a Tim Trio using the 32-channel coil.  The volume
looks
> normal in Freeview before applying the RAS resampling, and I've
never
> noticed it with data collected using the 12-channel coil.  Has
anyone
> else seen this?
>
> Thanks,
> Andy
>
> --
> Andrew R. Dykstra, PhD
> Auditory Cognition Lab
> Neurologie und Poliklinik
> Universitätsklinikum Heidelberg
> Im Neuenheimer Feld 400
> 69120 Heidelberg
>
> "How small the cosmos.  How paltry and puny compared to human
> consciousness . . . to a single individual recollection." - Vladimir
> Nabokov
>
>
>
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--
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
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