[Insight-users] CT range and Volume Rendering

[Andreas Schuh]

How can a unsigned short value be negative?!?

CT images are scaled at Hounsfield units (HU) which is a normalized  
scale ranging from -1024 to 3072. The value 0 corresponds to water.  
The values for different tissues aren't different among different  
datasets. That's the good thing of CT images.

--
regards
Andreas

Am 14.02.2009 um 14:23 schrieb prabhat246 <prabhat246 at yahoo.com>:

>
> Hi..
> I tried to get maximum and minimum values in my  image data using
> MinimumMaximumImageCalculator. I keep pixel type Unsigned short int.
> I get min = -3024 and max = 3072.
>
> Is it reasonable??? Does the intensity for bone and skin changes from
> Dataset to Dataset???
> Is there any inbuilt class to perform windowing for differnt thing  
> e.g.
> bone, lungs etc??
>
>
> The other thing I want to know is in Volume rendering. How can I  
> assign
> opacity to each pixel by checking its intensity value??
> -- 
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