Thread Subject:

Medical image registration

I am trying to register two CT images from the same patient.
Here are the images.

http://s1192.photobucket.com/albums/aa325/privatemeet/CT%20images/

Actually, I would like to register them somehow, maybe according spine bone or some other object.

Did anybody worked on this before?

Yes. Lots of people. Their papers are all listed here:

http://iris.usc.edu/Vision-Notes/bibliography/contentsmatch-pl.html#Registration,%20Matching%20and%20Recognition%20Using%20Points,%20Lines,%20Regions,%20Areas,%20Surfaces

and here:

http://iris.usc.edu/Vision-Notes/bibliography/contentsmedical.html#Medical%20Applications,%20CAT,%20MRI,%20Ultrasound,%20Heart%20Models,%20Brain%20Models

with so many methods I can't really tell you which is best for your
application. You'll have to figure that out on your own.

Thanks ImageAnalyst....I read a lot of papers on it, and I just cannot figure out how to do it...
I'll read more....

"privatemeet none" <privatemeet@yahoo.com> wrote in message <ic2qhg$9al$1@fred.mathworks.com>...
> I am trying to register two CT images from the same patient.
> Here are the images.
>
> http://s1192.photobucket.com/albums/aa325/privatemeet/CT%20images/
>
> Actually, I would like to register them somehow, maybe according spine bone or some other object.
>
> Did anybody worked on this before?

Have you looked at papers on digital volume correlation? I assume, you have 3D volumes since these are CT scans. Do you have significant rotations? This would severely impact your choice of algorithm and implementation

For just translational registration you want to minimize the normalized cross correlation coefficient (the equation for that can be found easily). However, since that's rather computationally expensive you can get away with minimizing the absolute differences.

You can also look into a phase correlation method which is very easy to implement and can account for rotational effects (and scaling, but that shouldn't be an issue).

I will check the phase correlation, this might be the issue...Do you have nay links where I can find some paers?

"privatemeet none" <privatemeet@yahoo.com> wrote in message <ic3hef$2gs$1@fred.mathworks.com>...
> I will check the phase correlation, this might be the issue...Do you have nay links where I can find some paers?

http://en.wikipedia.org/wiki/Phase_correlation
and corresponding references

Or search this newsreader for it.

ImageAnalyst <imageanalyst@mailinator.com> wrote in message <a6d49e29-8756-45f5-98b7-3ae17c5d790e@32g2000yqz.googlegroups.com>...
> Yes. Lots of people. Their papers are all listed here:
>
> http://iris.usc.edu/Vision-Notes/bibliography/contentsmatch-pl.html#Registration,%20Matching%20and%20Recognition%20Using%20Points,%20Lines,%20Regions,%20Areas,%20Surfaces
>
> and here:
>
> http://iris.usc.edu/Vision-Notes/bibliography/contentsmedical.html#Medical%20Applications,%20CAT,%20MRI,%20Ultrasound,%20Heart%20Models,%20Brain%20Models
>
> with so many methods I can't really tell you which is best for your
> application. You'll have to figure that out on your own.

How can I remove a signal interference i my Noise Power Spectrum in CT dicom images?
Do you know any literature for NPS analysis in dicom images???