[Insight-users] fixed and moving image

[Robert Tamburo]

Chapter 8 of the ITK Software Guide describes the registration  
framework in great detail (diagrams included!): http://www.itk.org/ItkSoftwareGuide.pdf

On Sep 29, 2009, at 9:00 AM, kevin cavin wrote:

> Hi, Markus:
>
>       Thanks for your reply.  what your explanation is clear.  
> Actually the reason I ask this question is just because I found that  
> If I change the two images ( fixed and moving ) I could obtain  
> different results. Therefore I come up the question.
>
>       It seems for me that if you want register one image with  
> another one, and  if you do not want the orginal one is modified ,  
> the you should set that one as fixed since the moving image will be  
> resampled and interpolated. But sometime it seems that  setting the  
> orginal image as fixed image can not get registeration result as  
> good as it has been set as moving image.
>
>      Maybe  you have some extra thought about that.
>
>
> Kind regards
>
> calvin
>
>
>
>
> --- On Tue, 9/29/09, Markus Neuner <neuner.markus at gmx.net> wrote:
>
> From: Markus Neuner <neuner.markus at gmx.net>
> Subject: Re: [Insight-users] fixed and moving image
> To: "kevin cavin" <beibeiwen2003 at yahoo.com>
> Cc: insight-users at itk.org
> Date: Tuesday, September 29, 2009, 8:13 PM
>
> 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
> >
> >
> >
>
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