[vtkusers] Volume Rendering of 3D CT Scan similar to 2D X Ray image

[Bill Lorensen]

I have some code we wrote years ago. It used
typedef itk::ExpNegativeImageFilter<InputImageType,InternalImageType>
      ExpNegativeType;
    ExpNegativeType::Pointer expNegative = ExpNegativeType::New();
    expNegative->SetInput( thresh->GetOutput());
    expNegative->SetFactor( -.0011 );

followed by
   // grab a row for the 'DRR'
    typedef itk::AccumulateImageFilter<InternalImageType,InternalImageType>
AccumulateType;
    AccumulateType::Pointer APAccumulate = AccumulateType::New();
    AccumulateType::Pointer lateralAccumulate = AccumulateType::New();

    APAccumulate->SetAverage(false);
    lateralAccumulate->SetAverage(false);
    APAccumulate->SetAccumulateDimension(1);
    lateralAccumulate->SetAccumulateDimension(0);

    APAccumulate->SetInput ( expNegative->GetOutput() );
    lateralAccumulate->SetInput ( expNegative->GetOutput() );
    APAccumulate->Update();
    lateralAccumulate->Update();

I'll be happy to share the code with the caveat that it has lots of
application specific code in it.

There is also the ITK Example:
Examples/Filtering/DigitallyReconstructedRadiograph1.cxx

Bill

On Fri, Jan 24, 2014 at 10:23 AM, Arnaud Gelas <arnaudgelas at gmail.com> wrote:
> Hi all,
>
> I would like to render as realistic as possible 1 3D CT Scan, as if it was 2D X Ray Image.
>
> I have tried Average Intensity Projection, but results are much smoother than what it should look like.
>
> Has anyone any experience on the question? Any advice appreciated?
>
> Do I need to generate a specific transfer function for this CT? Could I apply the same transfer function to another one?
> Has anyone got such a transfer function that could be shared?
>
> Thanks in advance,
>
> Best regards
> Arnaud Gelas
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