[Mrtrix-discussion] voxel editing

[Kerstin Pannek]

Hi Donald

unfortunately that didn't work.
Attached is a screenshot that might explain the problem we are having a 
bit better. Basically we can edit in about 3/4 of the brain, and then it 
just ends...

I tried using fslview for drawing ROIs, but it does some funny flipping 
when it saves the ROI

Cheers
Kerstin


Donald Tournier wrote:
> Hi Kerstin,
>
> Yes, mrview is not great for drawing ROIs. A better version is on my
> to-do list...
>
> There are often subtle alignment issues between the original image and
> the overlaid ROI. The problem is that the software tries to fill in
> the voxel at the current focus (crosshairs), and sometimes the
> crosshairs are right on the border between two voxels, causing some
> voxels to update and other not according to round-off. This can be
> very hard to spot, since the focus is a point in 3D space, so
> mis-alignment can happen through-plane. Try this:
> - turn off interpolation (View->Interpolate)
> - display the image in a different plane (i.e. go from axial to sagittal, etc)
> - make sure the crosshairs are in the middle of a voxel
> -  go back to the projection you were drawing on, and try to fill in
> those voxels you were having trouble with.
>
> Let me know if that doesn't help...
> Cheers,
>
> Donald.
>
>
> On Tue, Nov 3, 2009 at 9:18 AM, Kerstin Pannek <k.pannek1 at uq.edu.au> wrote:
>   
>> sorry if you received this email twice...
>>
>> --------
>>
>> Hi all
>>
>> we are having some trouble drawing ROIs on a mouse brains here. That is,
>> mrview allows us to only fill in or delete voxels in about 2 thirds of the
>> imaging volume, with a sharp line between editable and uneditable voxels in
>> the left-right direction.
>> We tried on 64 bit Ubuntu Hardy and 32 bit Ubuntu Jaunty.
>>
>> Any help on this would be greatly appreciated.
>>
>> Cheers
>> Kerstin
>> _______________________________________________
>> Mrtrix-discussion mailing list
>> Mrtrix-discussion at www.nitrc.org
>> http://www.nitrc.org/mailman/listinfo/mrtrix-discussion
>>
>>     
>
>
>
>   

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