[Insight-users] Extract an oblique 2D slice from a 3D volume

[Gheorghe Postelnicu]

Hi Luis,

Thanks for the suggestion. My prototype solution will indeed use the
aproach you suggest. However, it is obviously inefficient, as it will
resample the entire volume, when I will only need one slice.
Additionally, it presents the disadvantage of increasing the number of
necessary interpolations: to get the pixel value at a position, 2
interpolations (instead of one) will be necessary.

That is why I was thinking that an image wrapper class would be great.
If you can suggest an example or a skeleton of the methods that I
would need to write to make this happen, I would be more than happy to
contribute the code resulting.

Thanks,

On 5/7/07, Luis Ibanez <luis.ibanez at kitware.com> wrote:
>
>
> Hi Gheorghe
>
>
> You may want to use the
>
>              ResampleImageFilter
>
>
> You will have to provide the Transform that defines the resampling
> plane, and the parameters of the image grid that you want to use
> for the 2D image.
>
> Please read the ITK Software Guide
>
>
>       http://www.itk.org/ItkSoftwareGuide.pdf
>
>
> in particular the section on "Geometric Transformations".
>
> This section describes how you can set the parameters of a
> resampling problem.
>
>
>
>      Regards,
>
>
>        Luis
>
>
>
> ---------------------------
> Gheorghe Postelnicu wrote:
> > Hi,
> >
> > I am looking into ways to extract an oblique 2D slice from a 3D
> > volume. This is to be part of an iterative algorithm, so it would be
> > great to be able to setup an image wrapper that would emulate a 2D
> > image only sampling pixels when necessary. It would actually be great
> > if I were able to call a registration filter on one of these image
> > objects.
> >
> > The closest filter I found was ExtractImageFilter, but I don't think
> > it fulfills the requirements I have tried to expose above.
> >
> > It would be great if someone could provide some guidance on the
> > methods I would need to overwrite when writing a wrapper for a class
> > that would emulate a 2D oblique slice of a 3D volume or any other
> > method that would efficiently achieve this.
> >
> > Thanks,
>


-- 
Gheorghe Postelnicu, PhD
MGH, Harvard Medical School