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

[Arnaud Gelas]

Bill,

Thanks for the quick reply!!

I'll start playing with the ITK examples and the filters you mentioned.
Then depending on the output, I guess I'll have to dig in your code to get something better.

Let's see!

Cheers,
Arnaud

On Jan 24, 2014, at 4:33 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:

> 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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> Unpaid intern in BillsBasement at noware dot com