[Insight-users] about extracting the surface from 3D MRI

[Luis Ibanez]

Hi Yixun,

Yes, the method that you suggest is certainly
feasible.  You can convert vtkPolyData into
an itk::Mesh. For that purpose you may find
useful to look at the examples in the directory

   InsightApplications/Auxiliary/vtk/

in particular to the files

           vtkPolyDataToITKMesh.cxx
           vtk2itk.cxx
           vtk2itkDouble.cxx


The first example was added recently, so you
may have to update your CVS checkout in order
to get the file.



   Regards,


      Luis



---------------------
Yixun Liu wrote:
> Thank your help! Following  your advice, I think, it is better to use the VTK to extract the surface. However, the extracted surface is represented by the Mesh data object. Because I need to regiser this surface to another surface represented by the Pointset, I intend to take the mesh as the Pointset and use the itkPointtoPointMetric and the BSpline transform to non-regid register the two surface. Is this method feasible?
> 
> regards,
> 
> Yixun Liu
> ----- Original Message ----- 
> From: "Luis Ibanez" <luis.ibanez at kitware.com>
> To: "Yixun Liu" <yxliu at fudan.edu.cn>
> Cc: <insight-users at itk.org>
> Sent: Wednesday, July 14, 2004 11:45 PM
> Subject: Re: [Insight-users] about extracting the surface from 3D MRI
> 
> 
> 
>>Hi Yixun,
>>
>>You can use the BinaryMask3DMeshSource class
>>http://www.itk.org/Insight/Doxygen/html/classitk_1_1BinaryMask3DMeshSource.html
>>
>>Note that this is an implementation of the Marching Cubes
>>algorithm which is still covered by a Patent. You may have
>>to be careful with the conditions imposed by the use of
>>patented code. Contrary to the widespread belief, Universities
>>are not allowed to use patented material, not even for research
>>purposes, without first acquiring a license.
>>
>>http://www.sciencemag.org/cgi/content/full/300/5626/1635a
>>
>>That is the reason why we discourage the introduction of
>>any patented algorithms into ITK.
>>
>>
>>Another option is to convert your image to a VTK image
>>and use any of the several non-patented methods available
>>in VTK for extracting contours.
>>
>>
>>Note also that before you extract a surface from an anatomical
>>structure in an MRI image, you should perform some sort of
>>image segmentation on that image.  The simple extraction of
>>iso-surfaces directly from the image is unlikely to produce
>>an enclosed surface around an anatomical structure. You will
>>find a description of the segmentation methods available in
>>ITK in the Tutorial sessions
>>
>>   http://www.itk.org/HTML/Tutorials.htm
>>
>>in particular in
>>
>>http://www.itk.org/CourseWare/Training/SegmentationMethodsOverview.pdf
>>
>>and in the Segmentation chapter of the ITK Software Guide
>>
>>
>>   http://www.itk.org/ItkSoftwareGuide.pdf
>>
>>
>>
>> Regards,
>>
>>
>>     Luis
>>
>>
>>
>>------------------
>>Yixun Liu wrote:
>>
>>
>>>Hi ITKusers,
>>> 
>>>I want to extract the specific surface from the 3D MRI. Could anybody 
>>>tell me if the ITK supprot this operation?
>>> 
>>>Thans a lot!
>>> 
>>>Regards,
>>> 
>>>Yixun Liu
>>>
>>>
>>>------------------------------------------------------------------------
>>>
>>>_______________________________________________
>>>Insight-users mailing list
>>>Insight-users at itk.org
>>>http://www.itk.org/mailman/listinfo/insight-users
>>
>>
>>
>>
>