[Insight-users] Volview Adds more contours than needed

Thu, 27 Nov 2003 22:45:58 -0800

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Hi Luis,

Thank you for your response.

Does it mean that the marchingCubes alone is insufficient for generating
surface representation of objects in a labelled image.  Can you also explain
the difference between a labelled and a segmented image in ITKs context?

Attached are a few slices from my labelled image.

Yasser
----- Original Message ----- 
From: "Luis Ibanez" <luis . ibanez at kitware . com>
To: "ITK Stanford" <itk_at_stanford at yahoo . com>
Cc: <insight-users at itk . org>
Sent: Thursday, November 27, 2003 8:42 PM
Subject: Re: [Insight-users] Volview Adds more contours than needed

>
> Hi ITK-Stanford
>
> There is something strange in your description of the
> problem.  Adding contours in VolView should only generate
> iso-level at a particular value. It will not select a
> region that has an assigned value.
>
> If what you did was to *label* the segmented images and
> you assigned a label value of 182 to the aorta, and a
> label value of 0 to the trachea then spurious contours may
> appear around the trachea if the trachea has bordering
> labels that are at values > 182.
>
> Keep in mind that when you ask for an iso-contours at level
> 182 what you are computing is a surface with values < 182
> in one side and values > 182 on the other side. You are not
> asking for the surface surrounding a region whose value is 182.
>
>
>
> Here is a simple solution for your problem:
>
>                      Use the ITK plugins in VolView.
>
> Simply load your stack of images, then go to the menu
>
>                     "View" -> "Filter"
>
> and select the group
>
>                  "Segmentation - Region Growing"
>
> Then the filter
>
>                  "Confidence Connected (ITK)"
>
> Set
>
> the number of iterations to 2
> the multiplier to 1.0
> the output value to 255
>
> Then go to the menu
>
>                   "View" -> "Markers"
>
> enable "Display 3D cursor" and "Display 3D markers"
>
> Add a 3D marker inside the structure that you want to
> contour.
>
> Then go back to the filters menu (there should be a
> tab for it now) and click in "Apply Filter" the
> segmentation result will be a binary image of your
> label (eg. the region at label value 182 if that's
> where you put the 3D marker).  Once there, you can
> enable a contour at value level 128.
>
> You will also find useful to run the AntiAlias image
> filter available in the group " Surface Generation"
> it will smooth the iso-surface of your binary segmenation
> by reducing the staircase effects of the typical binary
> images.
>
>
> Please let us know if you find any problems,
>
>
> Thanks
>
>
>     Luis
>
>
> --------------------------------------------------------
> ITK Stanford wrote:
>
> >
> > Hi,
> >
> > I have a stack of .pgm files containing a segmented volume of the
> > heart.  I can open and view the intensity values of pixels in
> volview.
> > However, adding a contour at a certain intensity value, adds contours
> > for that value and all values lower than it.  For example the
> intensity
> > value of the descending aorta is 182 and the intensity value of
> trachea
> > is 0.  However adding a contour at value 182 also adds a contour at
> value 0.
> >
> > Any idea why this is happening and how can it be fixed??
> >
> > All help will be appreciated
> > --
> >
>
>
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk . org
> http://www . itk . org/mailman/listinfo/insight-users

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