[vtkusers] Pick a pixel in DICOM series

[Manuel Corrales]

Thanks Dean! Will try it.


On Mon, Jun 24, 2013 at 3:04 PM, Dean Inglis <inglis.dl at gmail.com> wrote:

> Hi Manuel,
>
> the example code in
> Wiki/VTK/Examples/Cxx/Images/PickingAPixel
> provides the world coordinates of the picked location.  If you want image
> i,j,k
>  indices, you have to convert those coordinates yourself using the image
> data's
> origin and spacing information.
> double* o = image->GetOrigin();
> double* s = image->GetSpacing();
> int x = static_cast<int>( ( x_world_pos - o[0] ) / s[0] + 0.5 );
>
> do similar calcs for y and z.
>
> regards,
> Dean
>
>
>
>
> On Thu, Jun 20, 2013 at 6:39 PM, Manuel Corrales <manuelcorrales at gmail.com
> > wrote:
>
>> Hello,
>>
>> I am displaying a DICOM series using vtk and "navigating" through the
>> slices using mouse interaction. I need to pick a pixel from the displayed
>> image, and I expected to get something like an array of coordinates e.g:
>> (142, 342, 13) assuming I can use this to actually fetch the data from the
>> vtkImageData structure.
>>
>> I tried to use the PickPixel and PickPixel examples from the wiki, but I
>> get coordinates with negative numbers
>>
>> (Location: ( -49.3894, 37.2297, -97.2094 ))
>>
>> and don't know what to do with that. My goal is to be able to pick a
>> pixel, get a coordinate and being able to use that coordinate to fetch the
>> pixel color from the vtkImageData.
>>
>> Any hints?
>>
>> Regards,
>> Manuel.
>>
>>
>>
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