[Insight-users] [ITK Community] Upsampling and Interpolators

[Luis Ibanez]

Hi Jose,

Yes, your intuition is correct in this case.

If you keep the images as a 4D image, the interpolator will
indeed blend values across time points. Since after all, they
are just seen as another spatial dimension.


You may want to do the 3D resampling within the original
3D images, before you compose them into a 4D image.


Note that since ITK 4.0 there is a set of classes in ITK
for managing ND+Time.


You will find them under

                /ITK/Modules/Video/Core/include


In particular,
you may find interesting the class

                         itkVideoStream.h


where you could put 3D images into a time sequence.


    Thanks

         Luis




On Tue, Feb 18, 2014 at 4:40 PM, Jose Ignacio Prieto <
joseignacio.prieto at gmail.com> wrote:

> Hi all, I am trying to upsample an image using this example as base
> http://www.itk.org/Doxygen/html/Filtering_2ResampleVolumesToBeIsotropic_8cxx-example.html#_a5
> I have MRI cine data with spacing like 1:1:8. I mounted all time frames
> into a 4D image and I would like to upsample on Z axis to get 1:1:1. I was
> wondering if I should better divide the 4D image  into a vector of 3D
> images so the interpolator wouldn't mix different times frames or it
> doesn't matter. ( also because I am interested in performance). Is it ok to
> use the linear interpolator for MRI? Or I should use BSPline? If so, is it
> faster to work on 3D  for the splines??
>
> Thank you very much
>
> Ignacio Prieto
>
> Software Developer
> Biomedical Imaging Center
> Pontificia Universidad Católica de Chile
>
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