[Insight-users] fixed and moving image

[Markus Neuner]

Hi Calvin,

In general the goal of registration is to find the transform that will 
bring a moving image into alignment with a fixed image based on the used 
registration criteria (maximize/minimize).
The transform maps points from the fixed image space to the moving image 
space.

Fixed image:
One or more fixed images are the reference of registration. It remains 
unchanged. The moving image is registered to match the fixed image.

Moving image:
The moving image is re-sampled to match the fixed image. Interpolation is 
performed in the moving image.

Which image is used as fixed and moving image heavily depends on the 
application. What images do you register (Size, Spacing, ...), and what 
is the desired goal of your registration?
If you change the two images you could obtain different results, 
especially when the spacings/sizes of th e images differ.


Best Regards,
Markus




kevin cavin wrote:
> Hello,
>
> I am working with ITK at this moment. I have one question regarding 
> the selection of fixed and moving images. Does it matter that which 
> one is fixed and which one is moving. Are there any rules for that? I 
> noticed normally the moving image will be interpolated. Thanks !
>
>
> sincerely
>
> calvin
>
>
>