[Insight-users] CT range and Volume Rendering

[prabhat246]

http://www.nabble.com/file/p22021173/IM400 IM400 Hi
Sorry the pixel type is signed short. 
When I analyzed the histogram of dataset. I see that histogram is fairly in
range of -1024 to 3072. But there is a special value of -3024 representing
black pixels. 

My other query remains unanswered...
> The other thing I want to know is in Volume rendering. How can I  
> assign
> opacity to each pixel by checking its intensity value??

It would be great you could explain a little about 
AddPoint and AddSegments of PieceWiseFunction.

Thanks for reply.
Regards,
Prabhat Kumar Gupta



Andreas Schuh-2 wrote:
> 
> 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??
>> -- 
>> View this message in context:
>> http://www.nabble.com/CT-range-and-Volume-Rendering-tp22012615p22012615.html
>> Sent from the ITK - Users mailing list archive at Nabble.com.
>>
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