[Insight-users] Problem to create RGB images

[Dan Mueller]

Hi Alfonso,

One option (which would preserve the HU) would be to create separate 
label images associated with each CT series to mark the nodules. These 
label images could then be displayed on top of the CT (with transparency 
if you desire). The CT series could then retain their pixel type and the 
labels take on any pixel type you desire (eg. unsigned char). ITK-SNAP ( 
http://www.itksnap.org ) does something similar to display the contour 
extracted from a level-set.

HTH

Cheers, Dan

Alfonso Castro Martinez wrote:
> We are using ITK 3.0.2 in linux to manipulate CTs in DICOM of lung 
> nodules from LIDC. In this database each CT serie has associated a XML 
> file with information about the position of the nodules and other 
> information about them.
>
> We are developing an application to read each XML file and it shows 
> the nodules in each CT in different colours depending about 
> information of the nodule. We are trying to create RGB images using 
> the itk::RGBPixel.
>
> The problem is we want to conserve the Hounsfield units in the CT, 
> however we can't be able to make it because the values of the pixels 
> must be unsigned char or unsigned short int.
>
> Are there some method in ITK to create a RGB image with the Hounsfield 
> units?
>
> Thanks.
>
> Alfonso Castro Martinez
> Faculty of Computer Science
> University of A Coruna
> Spain
>
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