[Insight-users] Thresholding Windowing

[Mathieu Malaterre]

Prabhat ,

  Rescale Slope/Intercept are automatically applied internally when
reading a DICOM file (even for MR Image Storage) so should *not* re
apply a shift/scale filter to the output of the itk-reader. Simply
instanciate a GDCMImageIO for reading the file, or let the
ImageIOFacgtory do it for you.

HTH
-Mathieu


On Sat, Jun 7, 2008 at 5:44 AM, prabhat246 <prabhat246 at yahoo.com> wrote:
>
> I have a knee bone dataset in DICOM format. One image is attached with this
> email.
> If I take the int datatype then the intensity of pixel is between -3024 to
> +768(approx).
>
> Can anyone tell me what is the correct method of doing
> windowing/thresholding??
> (I have read that all the pixel has to be multiplied by Rescale Slope and
> then added by Intercept.
> Rescale slope is 1 and rescale intercept is -1024.)
>
> and what should be the isovalue for bone to run vtkMarchingCubes.
> (I am reading Dicomfiles with itk and then using vtkMarchingCubes.)
>
> Thanks a lot.
> Prabhat http://www.nabble.com/file/p17704995/IM53 IM53
> --
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>
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-- 
Mathieu