[Insight-users] Geodesic Active Contours Segmentation with Shape Guidance

[Zachary Pincus]

Could you explain your question in a bit more detail? I presume you  
have read the Leventon et al. paper, which describes what the PCA  
shape modes are and how they contribute to shape guidance. (If not,  
it will be difficult to get the filter working properly.) The quoted  
code just reads in a "PCA shape model" that has been pre-computed  
earlier. Is your question about how to compute such a shape model in  
ITK?

Also, the geodesic active contour with shape guidance filter should  
work naturally in three dimensions (provided an appropriate transform  
for the shape model that works in 3D and a PCA model computed over 3D  
input images).

Zach


On Feb 3, 2006, at 4:06 AM, Steffi Meyer wrote:

> Hi everyone,
>
> I have a question about the geodesic active contours segmentation  
> with shape guidance. I want to
> expand it to the 3D case. I have problems with the following code  
> snippet:
>
>   ReaderType::Pointer meanShapeReader = ReaderType::New();
>   meanShapeReader->SetFileName( argv[13] );
>   meanShapeReader->Update();
>
>   std::vector<InternalImageType::Pointer> shapeModeImages 
> ( numberOfPCAModes );
>
>   itk::NumericSeriesFileNames::Pointer fileNamesCreator =
>           itk::NumericSeriesFileNames::New();
>
>   fileNamesCreator->SetStartIndex( 0 );
>   fileNamesCreator->SetEndIndex( numberOfPCAModes - 1 );
>   fileNamesCreator->SetSeriesFormat( argv[15] );
>   const std::vector<std::string> & shapeModeFileNames =
>           fileNamesCreator->GetFileNames();
>
>   for ( unsigned int k = 0; k < numberOfPCAModes; k++ )
>     {
>     ReaderType::Pointer shapeModeReader = ReaderType::New();
>     shapeModeReader->SetFileName( shapeModeFileNames[k].c_str() );
>     shapeModeReader->Update();
>     shapeModeImages[k] = shapeModeReader->GetOutput();
>     }
>
> Can someone explain this lines?
>
> Thanks very much!
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