[Rtk-users] Convex Hull

[Simon Rit]

Hi,
No, there isn't a way to estimate the convex hull. VTK probably offers
something like that but I haven't used it. Note that from x-ray
projections, you can threshold projections between air and object,
backproject and threshold the volume to have an approximation of the convex
hull.
Best regards,
Simon

On Mon, Jan 13, 2020 at 2:17 PM Andreas Andersen <andreasga22 at gmail.com>
wrote:

> Hi Stephanie,
> It depends on what you intend to compute more exactly:
>
> If it's to remove values outside the scanners field of view, then the
> filter "rtk::FieldOfViewImageFilter" does exactly this. ( It uses the
> lpsolve library to do this:
> https://github.com/SimonRit/RTK/blob/master/include/rtkFieldOfViewImageFilter.hxx#L41
>  )
>
> If it has anything to do with structures/delineations from DICOM, then
> wouldn't they already be the convex set?
>
> ITK uses three formats for structures: labelmaps, mesh and polyline. But
> VTK has much better classes for this IMO, and may have what you need.
> I don't think RTK has any direct use of any of the structure classes(?)
>
> Best Regards
> Andreas
>
> __________________________________
>
> Andreas Gravgaard Andersen
>
> Danish Center for Particle Therapy,
>
> Aarhus University Hospital
>
> Palle Juul-Jensens Blvd. 99,
>
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>
> Mail:     agravgaard at protonmail.com
>
> Cell:      +45 3165 8140
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>
> On Mon, 13 Jan 2020 at 09:46, Kaser, Stefanie <Stefanie.Kaser at oeaw.ac.at>
> wrote:
>
>> Hello everyone,
>>
>>
>> I just wanted to bring up another question since I haven't found anything
>> recent on the topic yet. Is it possible to calculate the convex hull of an
>> object with ITK/RTK? If so, which are the crucial modules to use?
>>
>>
>> Best regards,
>>
>> Stefanie
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