[Insight-users] Sparse or multislice registration

[Karthik Krishnan]

Laura:

The refactoring should consists of a Rectilinear image class that should
help address some of these concerns, but that's far from completion. I'm not
sure if there is anything for non-parallel acquisitions at all.

Hacks would be either :

(A) Use spatial obejcts to delineate the regions in your sparse image. You
can set a spatial object to confine the computation of metric values to, on
the fixed or the moving image. Construct a spatial object that returns
Inside values of true for the segments where data is acquired within your
sparse image.

OR

(B) Represent your spase image as a regular image and Write your own
interpolator class that when interpolating values from the moving image
(assuming this is the sparse image) does the magic. The registration
methods, resample filters all allow you to set a custom interpolator

--
karthik

On Wed, Feb 2, 2011 at 2:33 PM, Laura Lara <laura.lara at alma3d.com> wrote:

> Hi Dan,
>
> Thank you very much. I'll check it as soon as possible (the web pages are
> no available right now).
>
> Cheers,
>
>
> On Tue, Feb 1, 2011 at 11:48 AM, Dan Mueller <dan.muel at gmail.com> wrote:
>
>> Hi Laura,
>>
>> The following links may be useful:
>>
>> http://www.itk.org/Wiki/ITK_Release_4/Image_Class_Hierarchy_Refactoring
>>    (Requires developer access)
>>
>> http://www.itk.org/mailman/private/insight-developers/2010-October/thread.html
>>
>> These links detail a refactor of the image class hierarchy which would
>> support multi-slice images. Note that this is not yet implemented; I
>> believe the implementation is part of the ITKv4 activities. This
>> refactor would solve your issues, because a multi-slice image could
>> then be treated as a "normal" image and simply registered with the
>> existing registration framework.
>>
>> Cheers, Dan
>>
>> On 1 February 2011 11:07, Laura Lara <laura.lara at alma3d.com> wrote:
>> >
>> > Dear all,
>> > I've reviewed the 20 examples from
>> http://www.itk.org/Wiki/ITK/Examples/Included/Registration trying to
>> figure out how to perform registrations between 2D and 3D images, or, in
>> more general terms, registrations between a set of nonparallel 2D images and
>> a 3D image, and even registration between a sparse 3D image (few slices
>> quite separated) and a "full" (dense) 3D image. Maybe I'm wrong, but it
>> looks like that the examples aren't suitable to solve my problems (all
>> registrations seem to be between "similar" images).
>> > A particular case I'm interested in is the registration of two liver
>> scans (of the same subject):
>> >
>> > A "dense" 3D image, and
>> > a multi-slice 3D image, where the slices are non uniformly separated and
>> the spacing between them is very high.
>> >
>> > I would like to know if there is any example or application for this
>> kind of registration problem in ITK (sparse or multislice registration), or
>> hints on how to tackle this problem using ITK.
>> > Any suggestion/hint will be greatly appreciated.
>> > Thank you very much in advance.
>> >
>> > --
>> >
>> > Laura Lara Rodríguez
>> >
>> >
>> >
>> >  Alma IT Systems
>> >
>> >  C/ Vilana, 4B, 4º 1ª
>> >
>> >  08022 Barcelona
>> >
>> >  T. (+34) 932 380 592
>> >
>> >  www.alma3d.com
>> >
>> >
>> >
>> > --
>> >
>> > Laura Lara Rodríguez
>> >
>> >
>> >
>> >  Alma IT Systems
>> >
>> >  C/ Vilana, 4B, 4º 1ª
>> >
>> >  08022 Barcelona
>> >
>> >  T. (+34) 932 380 592
>> >
>> >  www.alma3d.com
>>
>
>
>
> --
>
> *Laura Lara Rodríguez*
>
> * *
>
> *[image: logo-firma_peq]*
>
> * **Alma IT Systems*
>
> * *C/ Vilana, 4B, 4º 1ª
>
>  08022 Barcelona
>
>  T. (+34) 932 380 592
>
>  www.alma3d.com
>
>
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