[vtkusers] correction of spacing

[Dominik Szczerba]

Haha! - see my recent posts.
Try updating the pipeline with the correct spacing.

Dominik

Bartosz Wiklak wrote:
> Hello,
> 
> I'm using GDCM  ( vtkGDCMImageReader ) to read some MR data.
> I switched  SetComputeZSpacing on, set SetZSpacingTolerance to 1e-2
> and used IPPSorter.
> This is my code:
> 
>   vtkGDCMImageReader *reader = vtkGDCMImageReader::New();
> 
> 
> 
> 	std::vector<std::string> filenames;
> 
> 
> 
> 	gdcm::Directory d;
> 
> 
> 
> 	d.Load( "/home/basiek/Dokumenty/dcms/testGLOWA/1", false );
> 
> 
> 
> 	filenames = d.GetFilenames();
> 
> 	gdcm::IPPSorter s;
> 
> 	s.SetComputeZSpacing( true );
> 
> 	s.SetZSpacingTolerance( 1e-2 );
> 
> 	bool b = s.Sort( filenames );
> 
> 	if( !b )
> 
> 		{
> 
> 		std::cerr << "Failed to sort:" << "s" << std::endl;
> 
> 		return 1;
> 
> 		}
> 
> 
> 
> 	std::cout << "Sorting succeeded:" << s.GetZSpacing() << std::endl;
> 
> 	//s.Print( std::cout );
> 
> 
> 
> 	const std::vector<std::string> & sorted = s.GetFilenames();
> 
> 
> 
> 	vtkStringArray *files = vtkStringArray::New();
> 
> 	std::vector< std::string >::const_iterator it = sorted.begin();
> 
> 	for( ; it != sorted.end(); ++it)
> 
> 	{
> 
> 	const std::string &f = *it;
> 
> 	files->InsertNextValue( f.c_str() );
> 
> 	}
> 
> 	reader->SetFileNames( files );
> 
> 	reader->Update();
> 
> I'm getting zspacing 1.5 whitch is ok, but in the
> reader->GetOutput()->GetSpacing(spacing) I'm getiing spacing[2]==1.0 !
> 
> What am I doing wrong?
> I tried to set pixelspacing manually but after
> reader->GetOutput()->UpdateInformation() I'm with old, wrong value
> again.
> 
> When I make reslice in coronal I have eyes shaped like ellipses. I
> tired to set pixelspacing for vtkImageReslice:
> reslice->SetOutputSpacing( spacing[0], spacing[1], 1.5 );
> 
> but this also makes no difference regardless
> reslice->GetOutput()->UpdateInformation().
> 
> Can someone point me in the right direction?
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-- 
Dominik Szczerba, PhD
Computational Physics Group
IT'IS Foundation
http://www.itis.ethz.ch