[Insight-users] Kideny Segmentation

[Emiliano Beronich]

Thanks for your answer, Luis. I've posted some images.

http://www.veccsa.com/images/thumbs.png

This one presents intensity irregularities inside the kidneys,
http://www.veccsa.com/images/0001602.png

The irregularities inside the kidney change the gradient and add a 
potential edge difficult to discriminate without other considerations.

Diffuse edges,
http://www.veccsa.com/images/0002201.png

Different intensities between left and right kidney,
http://www.veccsa.com/images/0003101.png

The final target is to get a contour of the kidney. I hope this images 
allows you to get a better idea of the problem. I'm reading about Model 
based registration.

Regards,
Emiliano



Luis Ibanez escribió:
> 
> Hi Emiliano,
> 
> Can you post in a web site a couple of screen shots of your images ?
> 
> That will help a lot to figure out the degree of irregularities
> in your images.
> 
> If you are having to deal simultaneously with:
> 
>   1) Different intensities between left and right kidney
>   2) Intensity irregularities inside the kidneys
>   3) Diffuse edges
> 
> 
> Then you probably may want to use model-based segmentation.
> 
> In this approach you create a geometrical model of a kidney
> (e.g. by segmenting a typical kidney from another modality
> such as CT or MR where the kidney anatomy will be better
> defined).  Then you register this geometrical model against
> the gamma camera image that you have.
> 
> You will find a description of this method at the end of the
> Image Registration chapter of the ITK Software Guide:
> 
>        http://www.itk.org/ItkSoftwareGuide.pdf
> 
> 
> As any other segmentation method, this approach has some
> advantages and disadvantages, but, given the constrains
> that you listed in your email, it seems to be more appropriate
> than methods such as level sets, watersheds and region growing.
> 
> 
> 
> That being said...
> We should first take a look at your images. Maybe the factors
> that you describe are not as accentuated as we are assuming
> here.
> 
> 
> 
>     Regards,
> 
> 
> 
>         Luis
> 
> 
> ------------------------
> Emiliano Beronich wrote:
> 
>> Hello,
>>
>> I write in regard to a technical problem with segmenting kidneys from 
>> gamma cammera images. I am basically trying to segment a kidney and I 
>> am facing problems such as different intensity regions between right 
>> and left kidney, irregularities inside the kidney region and diffuse 
>> edge of the region by a slow trasition.
>> I would like to know which strategy is recommended to deal with these 
>> issues and which algorithm you consider better for this application.
>>
>>
>> Regards,
>>
>>     Emiliano
>> _______________________________________________
>> Insight-users mailing list
>> Insight-users at itk.org
>> http://www.itk.org/mailman/listinfo/insight-users
>>
>>
> 
>