[Insight-users] Need advice on LV MRI segmentation

[Luis Ibanez]

Hi Barry,

Could you please post screenshots of your images to a public web site ?

In particular, the original tagged MRI image, and the segmentation that
you are obtaining so far.

If we can see the images, it will be a lot easier to advise you on the
potential segmentation methods that you may want to try.

     Regards,


            Luis


--------------------
On Sun, Nov 8, 2009 at 9:36 PM, Barry Branham <bhb at branham.ws> wrote:
> Hi all,
>
> I'm working on a project to segment left ventricular walls from 2D MRI
> images and would like to get advice on how to proceed with the epicardial
> walls.
>
> My project is to segment left ventricular walls (the round ones) from 2D MRI
> images.  I'm using 2D because the main application uses Tagged MRI images
> for determining tissue displacements for input into an FEA application for
> determining wall stress/strains.  And the Imaging sequence requires long
> patient breath holds so apparently they are limited in the number of slices
> output so my slice spacing is about 8mm.  Fortunately they have recently
> also acquired non-tagged images that I can use for segmentation.  I have had
> good luck segmenting the endocardial walls using IntensityWindow ->
> CurvatureFlow -> ConfidenceConnected, then
> DeformableMesh2DFilter which I converted from DeformableMesh3DFilter.
>
> The epicardial walls are harder because of the lack of large gradients on
> part of the outside (non-septal) wall.  My current plan is to use a
> deformable model generated by getting the major axis from the endo wall and
> generating a slightly larger oriented ellipse from that.  I need a good way
> to enlarge it to fit the epicardial wall.
>
> Thanks for any suggestions,
> Barry Branham
> Cardiothoracic Surgery Research
> Washington University School of Medicine
> St. Louis, MO
>
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