[vtkusers] How get DICOM image intensity?

[Italo Ribeiro]

Hi Jim,

The value not is same the entire tooth, the diferents values are the same
point. In point (226, 100, 1) the values are:

ITKsnap : 2130
Mycode: 993

2010/9/12 Jim Peterson <jimcp at cox.net>

> 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>
>>
>
>


-- 
Ítalo Mendes
ogre.irados.org
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