I will edit the wiki page - I believe it is wrong. You cannot erase a
segmentation by using the 3rd mouse button. In order to erase, you
actually have to re-draw what the underlying segmentation was originally.
If you are working on the aseg.mgz and plan to save your edits as
aseg.mgz, to "erase" something you adding in error you right click on the
Edit Segmentation button and the Segmentation Brush Info window will pop
up. From the list of structures, choose the one that the area you edited
was originally. For example, if you were adding thalamus on top of Left
Cerebral White Matter and what to delete the thalamus label, choose Left
Cerebral White Matter and use the 2nd mouse button to draw over the
thalamus voxels you want to remove.
If you are creating a segmentation and not saving it as aseg.mgz,
you probably want to choose "0 Unknown" from the Segmentation Brush Info list
to "erase" segmentation you have added.
Allison
--
On Fri, 20 Feb 2009, Bruce Fischl wrote:
> when you erase them they probably show the underlying gray-scale of whatever
> volume you are showing
> On Fri, 20 Feb 2009, Silvia biopanda wrote:
>
>> Thanks Sita for your anwser, but, i'm sure that i'm using the correct
>> tool, the thing is that i can erase the wrong voxels, but, when i
>> erase them, they get coloured with a diferent contrast, i have tried
>> to change the volume tool configuration and still appears with
>> different contrast (a grey colour)
>>
>> thanks Silvia
>>
>> 2009/2/19 Sita Kakunoori
sita@nmr.mgh.harvard.edu:
>>>
>>> Make sure you are selecting the 'Edit segmentation tool' on the tkmedit
>>> tools window. You can also press the 'g' key to select the tool.
>>>
>>> Sita.
>>>
>>>
>>>
>>> On Thu, 19 Feb 2009, Silvia biopanda wrote:
>>>
>>>> Hi,
>>>> we are making changes in the aseg.mgz and we need to know how to erase
>>>> a wrong pixels. we read in the tutorial that the button three erases,
>>>> but it doesn't work.how can we do?
>>>> cheers,
>>>> SK
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>>>>
>>>
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