[Rtk-users] FDK reconstruction error

[Akshara P K]

Hi all,

  We're currently engaged in CBCT reconstruction and have successfully
developed a Python-based code for the task, which functions without issue.
However, encountering an error during the conversion process to C++,
specifically at the stage of FDK reconstruction filter implementation, has
prompted our inquiry. The error message reads as follows:

itk::ExceptionObject (000000EBA52FDC68)
Location: "unknown"
File:
C:\ITK\src\Modules\Filtering\FFT\include\itkRealToHalfHermitianForwardFFTImageFilter.h
Line: 85
Description: ITK ERROR: Object factory failed to instantiate class
itk::RealToHalfHermitianForwardFFTImageFilter<class
itk::Image<float,3>,class itk::Image<class std::complex<float>,3> >

  Our FDK implementation in C++ is as follows:

using FDKGPUType = rtk::CudaFDKConeBeamReconstructionFilter;

// Creating the FDK reconstruction filter
FDKGPUType::Pointer feldkamp = FDKGPUType::New();

// Setting input images for the FDK reconstruction filter
feldkamp->SetInput(0, constantImageSource2->GetOutput());
feldkamp->SetInput(1, ParkerFilter->GetOutput()); // This is the projection
stack from rtkProjectionsReader

// Setting geometry for the FDK reconstruction filter
feldkamp->SetGeometry(geometry);

// Setting ramp filter parameters
feldkamp->GetRampFilter()->SetTruncationCorrection(0.0);
feldkamp->GetRampFilter()->SetHannCutFrequency(0.0);

// Executing the reconstruction filter
try {
    feldkamp->Update();
}

ChatGPT

We're currently engaged in CBCT reconstruction and have successfully
developed a Python-based code for the task, which functions without issue.
However, encountering an error during the conversion process to C++,
specifically at the stage of FDK reconstruction filter implementation, has
prompted our inquiry. The error message reads as follows:

vbnet
Copy code
itk::ExceptionObject (000000EBA52FDC68)Location: "unknown"File:
C:\ITK\src\Modules\Filtering\FFT\include\itkRealToHalfHermitianForwardFFTImageFilter.hLine:
85Description: ITK ERROR: Object factory failed to instantiate class
itk::RealToHalfHermitianForwardFFTImageFilter<class
itk::Image<float,3>,class itk::Image<class std::complex<float>,3> >

Our FDK implementation in C++ is as follows:

cpp
Copy code
using FDKGPUType = rtk::CudaFDKConeBeamReconstructionFilter;
// Creating the FDK reconstruction filter
FDKGPUType::Pointer feldkamp = FDKGPUType::New();
// Setting input images for the FDK reconstruction filter
feldkamp->SetInput(0, constantImageSource2->GetOutput());
feldkamp->SetInput(1, ParkerFilter->GetOutput()); // This is the
projection stack from rtkProjectionsReader
// Setting geometry for the FDK reconstruction filter
feldkamp->SetGeometry(geometry);
// Setting ramp filter parameters
feldkamp->GetRampFilter()->SetTruncationCorrection(0.0);
feldkamp->GetRampFilter()->SetHannCutFrequency(0.0);
// Executing the reconstruction filtertry {
    feldkamp->Update();
}

We're employing ITK version 5.3 for this implementation. Any insights into
the cause of this error would be greatly appreciated.

Regards,
Akshara
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