[ITK-users] Getting different labels slice by slice

[Sarah Basti]

I tried to do the following:

typedef itk::PhysicalPointImageSource<OutputImageType> physicalPointImageType;

physicalPointImageType::Pointer physicalImage = physicalPointImageType::New();
        physicalImage->SetSize(reader->GetOutput()->GetLargestPossibleRegion().GetSize());


physicalImage->Update();


I get this error though:

In file included from /home/Support/Slicer-SuperBuild-Release/ITKv4/Modules/Filtering/ImageSources/include/itkPhysicalPointImageSource.h:81:0,                 from /home/acorvo/Desktop/SlicerModules/Cross-Section-Location/Source/CrossSectionLocation.cxx:18:/home/Support/Slicer-SuperBuild-Release/ITKv4/Modules/Filtering/ImageSources/include/itkPhysicalPointImageSource.hxx: In member function ‘void itk::PhysicalPointImageSource<TOutputImage>::ThreadedGenerateData(const RegionType&, itk::ThreadIdType) [with TOutputImage = itk::Image<short unsigned int, 3u>, itk::PhysicalPointImageSource<TOutputImage>::RegionType = itk::ImageRegion<3u>, itk::ThreadIdType = unsigned int]’:/home/Desktop/SlicerModules/Cross-Section-Location/Source/CrossSectionLocation.cxx:238:1:   instantiated from here/home/Support/Slicer-SuperBuild-Release/ITKv4/Modules/Filtering/ImageSources/include/itkPhysicalPointImageSource.hxx:71:7: error: subscripted value is neither array nor pointermake[2]: *** [CMakeFiles/CrossSectionLocation.dir/CrossSectionLocation.cxx.o] Error 1make[1]: *** [CMakeFiles/CrossSectionLocation.dir/all] Error 2make: *** [all] Error 2
Do you know what that might mean? Any idea?
Thank you,SarahFrom: ahalabasti at hotmail.com
To: blowekamp at mail.nih.gov
Date: Fri, 23 May 2014 13:17:13 +0000
CC: insight-users at itk.org
Subject: Re: [ITK-users] Getting different labels slice by slice




Hi Brad,
thank you very much, I really appreciate your help!! It is indeed a great idea what you are proposing, thanks!! Only one question: is the PhysicalPointImageSource used as if it was a normal image (but having the slice number on it)? Sorry for that, but I haven't found any example and I'm quite new with ITK. 

Thank you very much!!Sarah
Subject: Re: [ITK-users] Getting different labels slice by slice
From: blowekamp at mail.nih.gov
Date: Fri, 23 May 2014 07:48:19 -0400
CC: insight-users at itk.org
To: ahalabasti at hotmail.com

Hello Sarah,
Here is an idea. Create an image where each slice contains the slice number, then add that to you original label image, and do a little binary logic. The goal here would be to give each slice sequentially higher numbers. Then you can runs a statistics image filter in 3D. You can use the a component from the PhysicalPointImageSource[1] as the image with the slice number.
Good luck,Brad
[1] http://www.itk.org/Doxygen/html/classitk_1_1PhysicalPointImageSource.html
On May 23, 2014, at 6:50 AM, Sarah Basti <ahalabasti at hotmail.com> wrote:Hello guys,
I'm quite new with ITK and I really need your help. I was able to extract/segment 3D objects from an image using the binary threshold image filter. However I'm stuck here, because I need to analyze the mean intensities of these objects in the original image, but I need to to this analysis in 2D, because I need the intensities for each slice. As suggested in some other post I tried using the slice by slice filter, converting the binary image into a label map and then into labels. And my idea was to then use the label statistics image filter on the output of the slice by slice filter to extract the mean values. However, it turned out that although the conversion is made slice by slice, many times on adjacent slices the same label is assigned to the same object (I guess that it makes sense!), so when I use the label statistics, is like having 3D labels again, instead of a set of 2D labels. Therefore, I was wondering if there is some option to have different labels for each slice, or there is any other way to evaluate the 2D mean intensity of 3D objects!
I thank you all in advance!!
Sarah_____________________________________
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