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List: insight-users
Subject: Re: [Insight-users] [ITK Community] Upsampling and Interpolators
From: Jose Ignacio Prieto <joseignacio.prieto () gmail ! com>
Date: 2014-02-21 14:33:57
Message-ID: CANkppu61aM480Wv6jw4B0d9pGTYvbRgY-AjEiSDpsP8nK5=itA () mail ! gmail ! com
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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@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@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
>>
>> _____________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Kitware offers ITK Training Courses, for more information visit:
>> http://www.kitware.com/products/protraining.php
>>
>> Please keep messages on-topic and check the ITK FAQ at:
>> http://www.itk.org/Wiki/ITK_FAQ
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.itk.org/mailman/listinfo/insight-users
>>
>> _______________________________________________
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>> http://public.kitware.com/cgi-bin/mailman/listinfo/community
>>
>>
>
--
José Ignacio Prieto
celular(nuevo): 94348182
[Attachment #5 (text/html)]
<div dir="ltr">Thanks a lot Luis, <div>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?<div><br></div><div> Thanks</div></div></div><div \
class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Feb 19, 2014 at 2:37 AM, \
Luis Ibanez <span dir="ltr"><<a href="mailto:luis.ibanez@kitware.com" \
target="_blank">luis.ibanez@kitware.com</a>></span> wrote:<br> <blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr">Hi Jose,<div><br></div><div>Yes, your \
intuition is correct in this case.</div><div><br></div><div>If you keep the images as \
a 4D image, the interpolator will</div> <div>indeed blend values across time points. \
Since after all, they</div> <div>are just seen as another spatial \
dimension.</div><div><br></div><div><br></div><div>You may want to do the 3D \
resampling within the original</div><div>3D images, before you compose them into a 4D \
image.</div><div><br>
</div><div><br></div><div>Note that since ITK 4.0 there is a set of classes in \
ITK</div><div>for managing ND+Time.</div><div><br></div><div><br></div><div>You will \
find them under</div><div><br></div><div> \
/ITK/Modules/Video/Core/include<br>
</div><div><br></div><div><br></div><div>In particular,</div><div>you may find \
interesting the class</div><div><br></div><div> \
itkVideoStream.h<br></div><div><br></div><div><br></div><div>where you could put 3D \
images into a time sequence.</div>
<div><br></div><div><br></div><div> Thanks</div><div><br></div><div> \
Luis</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><br><div \
class="gmail_quote"><div><div class="h5">On Tue, Feb 18, 2014 at 4:40 PM, Jose \
Ignacio Prieto <span dir="ltr"><<a href="mailto:joseignacio.prieto@gmail.com" \
target="_blank">joseignacio.prieto@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px \
#ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">Hi all, I am trying \
to upsample an image using this example as base <a \
href="http://www.itk.org/Doxygen/html/Filtering_2ResampleVolumesToBeIsotropic_8cxx-example.html#_a5" \
target="_blank">http://www.itk.org/Doxygen/html/Filtering_2ResampleVolumesToBeIsotropic_8cxx-example.html#_a5</a><div>
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?? </div>
<div><br></div><div>Thank you very much</div><div><br></div><div>Ignacio \
Prieto</div><div><br></div><div>Software Developer</div><div>Biomedical Imaging \
Center</div><div>Pontificia Universidad Católica de Chile</div></div>
<br></div></div>_____________________________________<br>
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Kitware offers ITK Training Courses, for more information visit:<br>
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Please keep messages on-topic and check the ITK FAQ at:<br>
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<br></blockquote></div><br></div> </blockquote></div><br><br \
clear="all"><div><br></div>-- <br>José Ignacio Prieto<br>celular(nuevo): 94348182 \
</div>
_____________________________________
Powered by www.kitware.com
Visit other Kitware open-source projects at
http://www.kitware.com/opensource/opensource.html
Kitware offers ITK Training Courses, for more information visit:
http://www.kitware.com/products/protraining.php
Please keep messages on-topic and check the ITK FAQ at:
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Follow this link to subscribe/unsubscribe:
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