[Insight-users] ITK and VTK

[Luis Ibanez]

HI Pietro,

It depends where in your application you are extracting the region.

If you are doing it in the code that deals with visualization and the
resulting region is only going to be used for display, then the VTK
filter will do just fine.

On the other hand, if you are doing this in the middle of a pipeline
and the extracted region is going to be used for subsequent
processing, you probably should prefer the ITK Region of Interest
filter:

http://www.itk.org/Doxygen/html/classitk_1_1RegionOfInterestImageFilter.html


since it preserves the orientation (direction cosines) of the image,
and properly sets the origin in physical coordinates of the output
image region.  This are very important attributes if you are using
the resulting image in registration, or if you plan to correlate it
spatially to the input image.

    Hope this helps,

         Luis


------------------------------------
On Wed, May 23, 2012 at 12:08 PM, Pietro Nardelli <pie.nardelli at gmail.com>wrote:

> Sorry guys,
>
> I have another question: I'm using the class Region of interest to
> crop a volume of a DICOM dataset, but I found out that in VTK there is
> the class Extract ROI which seems very similar. Does anyone know what
> the difference between the 2 classes? Which is the best one?
>
> Thank you,
>
> Pietro
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