[vtkusers] Know the value of skin while reading DICOM files

[Bill Lorensen]

-800 HU is probably a good guess with CT. ITK's dicom reader applies
the dicom slope/intercept fileds to the data and the result is
Hounsfiled Units: http://en.wikipedia.org/wiki/Hounsfield_scale

Typically, the slope is 1 and the intercept is -1024. If a reader does
not apply the slope/intercept, then -800 HU will typically be -800 +
1024 = 224. An intensity of 500 would be 1024 - 500 = -524 HU.

On Wed, Jun 16, 2010 at 11:22 PM, Nizam <nizam.abreu at gmail.com> wrote:
>
> Dear all,
>
>   I think my question is really stupid. Anyway, why all the codes that I
> read about showing the skin uses the value 500 for contour filter and in my
> dicom file it works only when I am using -800. Do I need to convert to
> unsigned char? How do I know the correct value if am I always using dicoms
> of the head?
>
> Thanks in advance,
> Nizam
> --
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