[Insight-users] Cerebral aneurysm Angiogram REGISTRATION DOUBT! ( PLEASE HELP URGENTLY)

[Luis Ibanez]

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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