[Insight-users] ring artifacts in CT
Mario Ceresa
mrceresa at gmail.com
Wed Apr 28 03:52:55 EDT 2010
Hello Somi,
rings artefacts happen in a CT scan if one of the detectors is faulty
or out of calibration. The detector then gives the same erroneous
reading at each angle and the result is a visible circle in the image.
You can read about some methods to reduce them here:
http://www.iop.org/EJ/article/0031-9155/54/12/018/pmb9_12_018.pdf
I'm sorry but I'm not aware of any "pluggable" solution, and the
scanner will probably need a repair/recalibration.
Hope this helps,
Mario
On 28 April 2010 09:27, Sergio Vera <sergio.vera at alma3d.com> wrote:
> It seems to me,
> after seeing that image, my first thought is that some filtering based on
> fourier analysis might help.
> At least when dealing with 2D images.
>
> Regards
>
> On Tue, Apr 27, 2010 at 9:27 PM, somi <seesomi at gmail.com> wrote:
>>
>> Hi,
>> I have some CT images which are severely degraded by ring artifacts during
>> acquisition .
>> The ring artifact looks something like :
>> http://www.upstate.edu/radiology/rsna/ct/images/artifact4.jpg (not my image)
>> , its more severe in my images.
>>
>> Has anybody encountered similar artifacts ? Is there is any out of the box
>> way to remove them ?
>>
>> Regards,
>> Somi
>>
>> _____________________________________
>> 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.html
>>
>> 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
>>
>
>
>
> --
> Sergio Vera
>
> Alma IT Systems
> C/ Vilana, 4B, 4º 1ª
> 08022 Barcelona
> T. (+34) 932 380 592
> www.alma3d.com
>
> _____________________________________
> 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.html
>
> 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
>
>
More information about the Insight-users
mailing list