[Insight-users] a query regarding image processing

[Luis Ibanez]

Hi Shahina,


1) The total number of pixels in your image can be found
     with the following call:

    ImageType::RegionType region = image->GetBufferedRegion();
    unsigned int numberOfPixels = region.GetNumberOfPixels();

    Note that ITK images have also the concept of the "largest
    possible region" which applies if you are streaming images
    into memory.

    In that case you could call

    region = image->GetLargestPossibleRegion();
    unsigned int numberOfPixels = region.GetNumberOfPixels();

    Both of these methods will give you values that are independent
    of the actual image content.


2)   You can get the voxel size by:

      ImageType::SpacingType spacing = image->GetSpacing();

      //      spacing[0]       voxel size across X
      //      spacing[1]       voxel size across Y
      //      spacing[2]       voxel size across Z


3)  You should read the "Data Representation" chapter
     of the ITK Software Guide.

         http://www.itk.org/ItkSoftwareGuide.pdf



Note that, if you what you need is the volume of specific
objects contained in the image (a brain, a liver...) then
there are other classes that you will need to use.



    Regards,


         Luis


----------------------------------------------------------------------------
On Sat, Mar 6, 2010 at 12:41 PM, shahina ismail <shainaismail at gmail.com> wrote:
> hi...
>
>    i am in need of counting the voxels in an image to calculate its volume
> using Matlab....its a 3D MR image of the brain..i am trying to multiply the
> voxel size with the number of voxels to get the volume...and i have
> calculated the voxel size....i would appreciate any help regarding the
> same....
>
>
>
> thanks and regards
> shahina.i
>
>
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