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

[Jose Ignacio Prieto]

Thanks a lot Luis,
And does anybody know if you can upsample to a non integer multiplier of
the previous resolution. If so, does it have a performance penalty over an
integer multiplier?

Thanks


On Wed, Feb 19, 2014 at 2:37 AM, Luis Ibanez <luis.ibanez at kitware.com>wrote:

> 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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-- 
José Ignacio Prieto
celular(nuevo): 94348182
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