[Insight-users] Registration Problem

[Fischer, Sven]

Hi Dan,

thank you for your answer. 
I did as you said and found that the registration works when I change fixed and moving image. It seems like it works when the moving image is the image where I have less 'information'. But it would be nice when it would work in both directions. And I'm afraid that it will not work again when in both images is a relative big amount of information. It seems like the choice of the optimizer settings, like Min and Max Step Length, Relaxation Factor and Gradient Magnitude Tolerance, and also other settings have a big influence on the registration. So is there some rule for setting them? I already read somewhere in the Mailing List that the Max Step Length should be 10 times the largest image spacing and Min Step Length half the smallest, but also this gives not always a good solution.

Regards
Sven


________________________________________
Von: Dan Mueller [dan.muel at gmail.com]
Gesendet: Dienstag, 23. Juni 2009 15:09
An: Fischer, Sven
Cc: insight-users at itk.org
Betreff: Re: [Insight-users] Registration Problem

Hi Sven,

As you say, the issue could be in numerous places. I suggest you start
simple, and build your application slowly from the ground up, using
components which are known to work.

For example, you might start with a command line application which
uses ITK to read the input DICOM images, perform the registration, and
write the registered output image. You can then use your favourite
image viewer to check the results. The next step could be to convert
the output image to VTK and display it. The final step would be the
whole application as you describe in your email.