[Insight-users] Question about 3D MI registration

[Karthik Krishnan]

Smriti,

No, the images are not resampled to the same resolution prior to 
registration.

Please read the "Registration" chapter of the software Guide.

Registration is done in physical space (world co-ordinates), not in 
pixel space. The images are not required to have the same resolution (in 
pixels) prior to registration.  The transform that the registration must 
compute is in physical co-ordinates.

-karthik

Smriti Raghunathan wrote:

> Hi,
> This might be a stupid question but I am using the
> "ImageRegistration8.cxx" program for 3D registration but I am using
> the Mutual Information metric instead of the Mean Squares Metric. I
> just wanted to know if the program actually resamples the images first
> to make them the same resolution before starting the registration
> process or if resampling is only done at the end after the
> registration is over.
>
> Thanks
>
> Smriti
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