Dear Jaime,<br>for sure it is possible.<br><br>A solution may be downsampling the image by a factor of two in the Z axis. Chapter 8.12 in the ITK software guide has some information about it.<br><br>Another one may be iterating over the whole volume by means of the image iterators provided by ITK and then keep the desired slice only, building up a volume with half the number of slices the original volume had.<br>
<br>The voxel size may be changed by a resampling operation over an image. The ResampleImageFilter does this (downsampling, upsampling or resizing):<br><br><a href="http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/ResampleImageFilter">http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/ResampleImageFilter</a><br>
<br>I guess any of the two should do the trick.<br><br>Regards,<br>JON HAITZ<br><br><br><div class="gmail_quote">On 30 May 2012 19:26, Jaime Tarjuelo <span dir="ltr"><<a href="mailto:jtarjuelo@gbt.tfo.upm.es" target="_blank">jtarjuelo@gbt.tfo.upm.es</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
I am working with a volume (.mhd image) of 38 slices and 1x1x3 voxel size. I want to convert it to a volume of 19 slices and 1x1x6 voxel size. I am trying to extract non consecutive slices (1,3,5,7,...) and construct the desired volume. I have tried to use ExtractImageFilter but I have not been able to select non consecutive slices. I can extract a 3D region setting the region, the start slice and the size, but of consecutive slices.<br>
<br>
I also have thought about performing a resample on the image, but in my opinion it would suposse a higher information loss than selecting non consecutive slices. Maybe I am wrong at this point.<br>
<br>
So question are, is it possible to extract non consecutive slices in order to build another image? And may the voxel size of this new image change?<br>
<br>
Thank you very much for your help.<br>
<br>
Jaime Tarjuelo.<br>
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