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ANTsX / ANTsR

R interface to the ANTs biomedical image processing library
https://antsx.github.io/ANTsR
Apache License 2.0
127 stars 35 forks source link

Iterative Update of Registration #256

Closed suppechasper closed 5 years ago

suppechasper commented 5 years ago

Hi,

Very nice to have ANTs in R.

Is it possible in antsRegistration to update the transforms in an iterative fashion? I.e:

  1. Register X to Y1
  2. Register X to Y2 starting form the previous transforms, and updating the previous transforms.

Thanks Sam

muratmaga commented 5 years ago

You can do something like this

reg1 = antsRegistration(X, Y1, typeofTransform='SyN') reg2 = antsRegistration(X, Y2, initialTransform = reg1$fwdtransforms, typeofTransform='SyN')

I am not sure how meaningful this would be if Y1 and Y2 are different images.

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From: Samuel Gerber notifications@github.com Sent: Saturday, January 12, 2019 9:52:19 AM To: ANTsX/ANTsR Cc: Subscribed Subject: [ANTsX/ANTsR] Iterative Update of Registration (#256)

Hi,

Very nice to have ANTs in R.

Is it possible in antsRegistration to update the transforms in an iterative fashion? I.e:

  1. Register X to Y1
  2. Register X to Y2 starting form the previous transforms, and updating the previous transforms.

Thanks Sam

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suppechasper commented 5 years ago

I think this is not quite what I want. I believe this concatenated two transformations. I'd like to update the original transforms and avoid finding an indirect path of transforms and also less regularized final transform. Of course I can just compute a new transform to Y2 from X but Y2 is an update of Y1 and the hope is that it would converge quicker when starting from the previous transform.

muschellij2 commented 5 years ago

What about using initialTransform: transforms to prepend, in antsRegistration?