[Insight-users] question about image and mesh interaction

[Alexander Taghva]

Thank you for your reply.  What I mean by getting the connection of points
in the mesh is that each vertex will be part of multiple triangle faces in
the mesh.  For example, you may have one triangle face made up of points
numbered 1, 2, 3 and another made of points 1, 4, 5.  Therefore, point 1 is
connected to 2, 3, 4, 5.  I guess I am trying to figure out if there is a
built-in way to get all edges associated with a vertex in a mesh as well as
all faces in the mesh containing a particular vertex.

On Sat, Mar 5, 2011 at 6:03 PM, wanlin <wanlinzhu at gmail.com> wrote:

>
> Hi, Alexander,
>
> On Sun, Mar 6, 2011 at 2:22 AM, Alexander Taghva <alextaghva at gmail.com>wrote:
>
>> Hello,
>> I am relatively new to ITK so I apologize if this is a basic question.  I
>> am working on implementing an algorithm to extract the brain from non-brain
>> on an MRI.  In order to do this, I am using a deformable mesh model.
>> Specifically, I am using RegularSphereMeshSource and expanding it to match
>> the image.  There are a few things I am trying to figure out how to do
>> efficiently:
>>
>
> 1. Calculate statistics (e.g. median intensity) for all image points inside
>> the mesh.
>>
> You can use itk::TriangleMeshToBinaryImageFilter to get binary image of
> your mesh, then perform statistics operation using
>  itk::StatisticsLabelMapFilter. (Not sure the performance, i guest you
> will do it in each iteration).
>
>>
>> 2. Iterate through the mesh to figure out all points connected to any
>> given vertex (when I implemented the algorithm in Matlab/C++ mex files, I
>> built an adjacency list for each vertex).
>>
>> What is your given vertex, is it a voxel? what is the meaning of
> connection of points to vertex (if for voxel, is it all points inside a
> voxel cube)?
>
>
>> 3. Extract the final brain image (specifically, label all points outside
>> the mesh 0) after deformation.
>>
>>  itk::TriangleMeshToBinaryImageFilter and itk::MaskImageFilter
>
> Sorry for the length of this post.  Thanks for your help.
>>
>>
>>
>
> wanlin
>
>


-- 
Alexander Taghva, MD
Department of Neurological Surgery
Keck School of Medicine, University of Southern California
Fellow, Functional Neurosurgery at Ohio State University
614-366-2420
alextaghva at gmail.com
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