[vtkusers] How get DICOM image intensity?

[Jim Peterson]

Hi Italo,

I am not an ITKSnap user myself, you are suggesting ITKSnap reports the 
same value for the entire tooth? I think you would have to iterate over 
the points in the tooth to find the maximum value in vtk to duplicate 
that if it is true. Can you display the point coordinates that have that 
value in ITKSnap? Then see if vtk has the same value at that point? I 
have trouble believing vtk has incorrect pixel data by point for imaging 
content.

Jim

Italo Ribeiro wrote:
> Hi Jim,
>
> I have dicom image with teeth, i am looking intensity values of 2 
> front teeth.
>
> But some happen very strange, the tooth the left have greater 
> intensity in ITKsnap 2518 and my code -1024. The tooth the right side 
> have in ITKsnap 2402 and in my code 41. I do not know why the values 
> are different.
>
> In my code i get 255 points of heigh and width, but when i get 
> dimension the image, vtk show 512 x 512, same dimesion show in 
> ITKsnap. ITKsnap get dimension of voxels, so i must get information 
> the intensity value voxel of volume and no pixel the image?
>
> thanks.
>
> 2010/9/11 Jim Peterson <jimcp at cox.net <mailto:jimcp at cox.net>>
>
>     Personally, I am sorry, but there is not enough information in
>     your description of the problem to be sure you have a legitimate
>     complaint. does your dicom data consist of only one point? how are
>     you certain you have selected the exact same location?
>
>     in my mainframe programming life we have a saying:
>
>     "when expected results do not match observed results, check the
>     library concatenation"
>
>     .... in my opinion, chances are you are looking at different points.
>
>     sorry, Hoping to be helpful not critical.
>     Jim
>
>     Italo Ribeiro wrote:
>
>         No more ideas?
>
>         2010/9/10 Italo Ribeiro <italo.ribeiro at gmail.com
>         <mailto:italo.ribeiro at gmail.com>
>         <mailto:italo.ribeiro at gmail.com
>         <mailto:italo.ribeiro at gmail.com>>>
>
>
>            I am expecting MIP of image point. In my program the value
>         for one
>            point is 1023 and ITKsnap show 2210.
>
>            Why the value is different?
>
>            2010/9/10 John Drescher <drescherjm at gmail.com
>         <mailto:drescherjm at gmail.com>
>            <mailto:drescherjm at gmail.com <mailto:drescherjm at gmail.com>>>
>
>
>                > Using GetScalarType the type returned is short, i was
>         using
>                int. But the
>                > value maximum showed is 1024 and i see the maximum short
>                value is 32767 and
>                > the intensity value is not corret.
>                >
>
>                Depending on how you read the dicom file the value
>         should be in
>                hounsfield units. I am confused on whether you mean you
>         were
>                expecting
>                32767 or hounsfield.
>
>                John
>
>
>
>
>            --     Ítalo Mendes
>            ogre.irados.org <http://ogre.irados.org>
>         <http://ogre.irados.org>
>
>
>
>
>         -- 
>         Ítalo Mendes
>
>         ogre.irados.org <http://ogre.irados.org> <http://ogre.irados.org>
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> Ítalo Mendes
> ogre.irados.org <http://ogre.irados.org>