[Insight-users] copy slice into volume

[Luis Ibanez]

Hi Mark,

ImageIterators are probably the best choice for
inserting a 3D image as a slice of a 4D image.
(or a 2D image as slice of a 3D image).

There is a filter for the reverse operation though:
http://www.itk.org/Insight/Doxygen/html/classitk_1_1ExtractImageFilter.html#_details
It could extract a 3D image from a 4D, or  a 2D
image from a 3D image.

You may use code similar to the following:

typedef itk::Image< chat, 3 >  Image3DType;
typedef itk::Image< chat, 4 >  Image4DType;

Image3DType::Pointer image3D = GetImage3DSomeHow();
Image3DType::Pointer image4D = GetImage4DSomeHow();

typedef itk::ImageRegionIterator<Image3DType>  Iterator3D;
typedef itk::ImageRegionIterator<Image4DType>  Iterator4D;

Image3DType::RegionType region3D;
region3D =  image3D->GetBufferedRegion()

Iterator3D it3( image3D, region3D );

Image4DType::RegionType region4D;

// ... figure out how the region of the 3D image
// should be placed in the corresponding region
// of the 4D image....
// Fill region4D with this information

Iterator3D it4( image4D, region4D  );

it3D.GoToBegin();
it4D.GoToBegin();
while( !it3D.IsAtEnd() )
   {
   it4D.Set(  it3D.Get() ); // copy a pixel
   ++it3D;
   ++it4D;
   }



Please let us know if you find any problem with
these iterators.

Thanks,

Luis


=======================================


Mark Hastenteufel wrote:
> Hello!
> 
> My problem is the following:
> 
> I want to copy a 2D (3D) Image into a slice of a 3D (4D) image.
> 
> What is the best way to do this? Should I use ImageIterators or is there
> something else.
> 
> Many Thanks,
> 
> Mark
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