[vtkusers] Pick a pixel in DICOM series

[Bill Lorensen]

How did you read the DICOM images.

The code looks OK.

Print o, s, xPos,yPos,zPos, and indices.



On Sun, Jul 14, 2013 at 11:36 AM, Manuel Corrales
<manuelcorrales at gmail.com>wrote:

> I am trying with this but getting strange values (negative values for z
> index for instance):
>
> double* o = image->GetOrigin();
> double* s = image->GetSpacing();
> indices[0] = static_cast<int>( ( xPos - o[0] ) / s[0] + 0.5 );
> indices[1] = static_cast<int>( ( yPos - o[1] ) / s[1] + 0.5 );
> indices[2] = static_cast<int>( ( zPos - o[2] ) / s[2] + 0.5 );
> return indices;
>
> I am mixing the coordinate somehow? Can you help me?
>
>
> On Mon, Jun 24, 2013 at 3:41 PM, Manuel Corrales <manuelcorrales at gmail.com
> > wrote:
>
>> 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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>>
>
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