[vtkusers] (dcmtk -> vtkImageData) for Volume rendering

[Cory Quammen]

Mallikarjun,

Could you clarify for me whether the first image at all looks like a human
head? Is the issue that the color/opacity maps do not appear to be applied
correctly, or that the data is just completely strange when reading from
dcmtk?

If it is the latter, I have a couple guesses:

- maybe your dimensions are off from what dcmtk tells you
- maybe dcmtk's conventions for voxel order are different from VTK

Cory

On Wed, Feb 10, 2016 at 2:40 AM, Mallikarjun K <mallikarjun49 at gmail.com>
wrote:

> Hello Cory Quammen,
>
> Thanks for the response and suggestions.We are kind of established in
> using dcmtk in our project,So couldn't use vtk-dicom for time being.
>
> Below is the code snippet which I used to get dcmtk data to vtk:
>
>
> vtkDataArray* scalars = 0;
>
>
>
> switch (dicomDataType)
> {
> case TYPE_U32Data:
> scalars = vtkUnsignedIntArray::New();
> ((vtkUnsignedIntArray*)(scalars))->SetArray((unsigned int*)dicomData,
> dicomDataSize, 1);//dicomData is the data from dcmtk
> break;
> case TYPE_U8Data:
> scalars = vtkUnsignedCharArray::New();
> ((vtkUnsignedCharArray*)(scalars))->SetArray((unsigned char*)dicomData,
> dicomDataSize, 1);
> break;
> case TYPE_U16Data:
> scalars = vtkUnsignedShortArray::New();
> ((vtkUnsignedShortArray*)(scalars))->SetArray((unsigned short*)dicomData,
> dicomDataSize, 1);
> break;
> case TYPE_S16Data:
> scalars = vtkShortArray::New();
> ((vtkShortArray*)(scalars))->SetArray((short*)dicomData, dicomDataSize, 1);
> break;
> }
> scalars->SetNumberOfComponents(1);
> double range[2];
> scalars->GetRange(range);
> m_imageData = vtkImageData::New();
> m_imageData->SetDimensions(dimensions);
> m_imageData->SetSpacing(spacing);
> m_imageData->GetPointData()->SetScalars(scalars);
> scalars->Delete();
> m_imageData->GetPointData()->GetScalars()->SetName("VR Cuboid");
>
>
> Thanks&Regards,
> Mallikarjun
>
>
>
> On Tue, Feb 9, 2016 at 8:47 PM, Cory Quammen <cory.quammen at kitware.com>
> wrote:
>
>> How are you getting the data from dcmtk to VTK? Code would be helpful.
>>
>> As an aside, you may be interested in David Gobbi's excellent DICOM
>> reader for VTK.
>>
>> https://github.com/dgobbi/vtk-dicom
>>
>> I believe you can build this within VTK by enabling the Module_vtkDICOM
>> option.
>>
>> Best,
>> Cory
>>
>> On Tue, Feb 9, 2016 at 8:25 AM, Mallikarjun K <mallikarjun49 at gmail.com>
>> wrote:
>>
>>> Hello All,
>>> I used dcmtk to read dicom raw data and applied Modality LUT and created
>>> a vtkImageData. When I used this data for Volume
>>> Rendering(vtkGPUVolumeRayCastMapper), I am getting the following output.
>>>
>>>
>>> [image: Inline image 2]
>>>
>>>
>>> When I used vtkDicomImageReader's output for Volume rendering ,I am
>>> getting the following output.
>>>
>>> [image: Inline image 1]
>>>
>>> Can anyone give some pointers why this is happening?
>>>
>>> Thanks in advance..
>>> --
>>> *With Kind Regards:*
>>> Mallikarjun
>>>
>>>
>>>
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>>
>>
>> --
>> Cory Quammen
>> R&D Engineer
>> Kitware, Inc.
>>
>
>
>
> --
> *With Kind Regards:*
> Mallikarjuna K,
> 07795531103/09908238861.
>
>


-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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