[Insight-users] Cerebral aneurysm Angiogram REGISTRATION DOUBT!

[Gaurav Sharda]

Hi Luis,

Hey I asked you earlier about the biplane image registration of 2D cerebral
angiograms.
In that one option you suggested was to project the 2D images into a 3D
volume and then track the minimum
values of that 3D volume.

Could you elaborate on this. How do I project the 2D angiograms into 3D
volume in ITK?

Here the image set I have are two orthogonal views ( lateral and AP view) of
cerebral angiograms. I need to get a 3D volume of the aneurysm specifically
from both these 2D views. Means kinda register the two 2D views and align
them perpendicularly. I hope this makes sense.


Eagerly awaiting your reply.

Anyone having ideas, would appreciate your help.

Thanks,
Gaurav.

On Sat, Feb 13, 2010 at 3:50 PM, Luis Ibanez <luis.ibanez at kitware.com>wrote:

> Hi Gaurav,
>

This is a very interesting subject, that unfortunately
> doesn't have a straight-forward solution.
>
> Typically this is done by:
>
>
> A) Extracting centerlines from each
>     one of the 2D projections.
>
> B) Finding bifurcation points (or in general critical
>     points) on each view.
>
> C) Matching bifurcation (and/or critical points)
>     between the views.
>
>
> The nature of the problem is such that you can't
> solve for all possible cases.
>
> Are the images acquired with a bi-plane Fluoroscopy
> system ?
>
> If so, at least you can build geometrical assumptions
> based on the fact that the images will be aligned in
> the circle of rotation of the Fluoroscopy machine.
>
> --
>
> You may want to take a look at the application:
>
>               Curves2DExtractor
>
> in InsightApplications
>
> http://www.itk.org/ITK/applications/Curve2DExtraction.html
>
> This application was developed to detect centerlines
> in 3D Angiograms, in a context related to brain aneurysms.
>
> You could use the resulting centerline points as the input
> for a process that finds geometrical correspondences.
>
>
> ---
>
> Another independent approach, is to project both of the
> 2D images into a 3D volume, and then track the minimum
> values of that 3D volume. This of course is far from being
> free of ambiguities, but at least it should give you an easy
> initialization for correspondences between the thick vessels
> at the base of the skull.
>
>
>
>       Regards,
>
>
>            Luis
>
>
> ---------------------------------------------------------------------
> On Fri, Feb 12, 2010 at 10:21 PM, Gaurav Sharda
> <gaurav.sharda.uiowa at gmail.com> wrote:
> > Hi there!
> >
> > I am Gaurav Sharda, a graduate student in University of Iowa,US.
> >
> > I am going to start my work on cerebral aneurysm Angiogram Registration.
> > I am going to have 2D angiograms of side view and top view of brain.
> Could
> > you suggest some registration techniques to find the co inciding
> portions?
> > The images are roughly orthogonal.
> > Please see if you could suggest some techniques and give me some useful
> > links.
> > Thanks a lot..
> >
> > Gaurav
> >
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