[Insight-users] [Insight-developers] Curves2DExtractor itk::ParametricSpaceToImageSpaceMeshFilter

[Luis Ibanez]

Hi Satish,

This looks like one of intermediate filters in the pipeline of the
Curves2DExtractor is not carrying along the information about image
spacing.

I'm now running a test with a non-unit spacing image to try to
replicate your report.


    Thanks

      Luis


On Tue, Feb 8, 2011 at 12:53 AM, Satish Kumar B.G <satish at compusol.in> wrote:
> Hi Luis,
>
>
>
> We're trying to extract 2D curves from a fluoroscopic image (2D, single
> slice, single frame DICOM file *.dcm).
>
> When I run the extractor, everything goes well and the curves are extracted
> as expected.
>
> But there's a problem when they are overlaid in the o/p i.e. saved file
>
> - if the i/p image is of size 512x512x1 pixels and
> pixel-spacing=1.000000\1.000000 then the extracted curves are properly
> overlaid
>
> - if the i/p image is of size 1000x1000x1 pixels and
> pixel-spacing=0.200000\0.200000, then the extracted curves seem to be
> overlaid to the top-left corner in the saved o/p file
>
>
>
> I guess the pixel-spacing is having an impact and I'm not sure where to look
> for to ensure the curves are overlaid correctly in all image sizes, as we
> need the curves pixels exact positions for the next stage of processing in
> our algo. I have attached two o/p images with the curves overlaid, 2D Curves
> Human (512x512x1 and pixel-spacing=1.000000\1.000000) and 2D Curves Phantom
> (1000x1000x1 and pixel-spacing=0.200000\0.200000).
>
> I have also attached the DICOM values for both the i/p images.
>
>
>
> Regards
>
> - Satish
>
>
>
> -----Original Message-----
> From: insight-developers-bounces at itk.org
> [mailto:insight-developers-bounces at itk.org] On Behalf Of Luis Ibanez
> Sent: Tuesday, February 08, 2011 2:12 AM
> To: Satish
> Cc: insight-developers at itk.org
> Subject: Re: [Insight-developers] Curves2DExtractor
> itk::ParametricSpaceToImageSpaceMeshFilter
>
>
>
> Hi Satish,
>
>
>
> Could you please clarify your question ?
>
>
>
> Maybe explain what you are trying to do,
>
> and what is exactly the problem that you are running into ?
>
>
>
> a screenshot may be useful here...
>
>
>
>
>
>      Thanks
>
>
>
>
>
>           Luis
>
>
>
> -----------------------------
>
> On Thu, Feb 3, 2011 at 8:38 AM, Satish <Satish at compusol.in> wrote:
>
>> Any help on the Curves2DExtractor when it overlays the extracted pixes in
>
>> 1000x1000x1 image, it is at the top left corner.
>
>>
>
>> Something to do with the itk::ParametricSpaceToImageSpaceMeshFilter ?
>
>>
>
>>
>
>>
>
>> Regards,
>
>>
>
>> Satish Kumar B.G
>
>>
>
>>
>
>>
>
>> Technical Architect
>
>>
>
>> COMPUSOL
>
>>
>
>>
>
>>
>
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>
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