[Rtk-users] {Spam?} Reconstruction problems

[Arvid Piehl Lauritsen Böttiger]

Hey Cyril

I just wrote another e-mail about how I generated the geometry file (it's
just simulated). But just in case I'll attach it here:

best

Arvid

On Mon, Oct 12, 2015 at 11:59 AM, Cyril Mory <cyril.mory at uclouvain.be>
wrote:

> Hi Arvid,
>
> Well, you're on the right track :-)
> Your Shepp Logan reconstruction looks fine, I guess it is just a
> visualization problem: you can use vv
> http://www.creatis.insa-lyon.fr/rio/vv
> to open it and you will be able to change the "window" and "level"
> settings in visualization.
>
> Regarding the cylinder, can you send your geometry file too ?
>
> Regards
> Cyril
>
> Le 12/10/2015 11:42, Arvid Piehl Lauritsen Böttiger a écrit :
>
> Hi there
>
> I hope someone can help me me get started with RTK.
>
> First of all I should mention that I have compiled RTK on Windows 7
> using Visual Studio 2013. Everything seems to compile and run just
> fine.
>
> Secondly: I tried to reproduce this example:http://wiki.openrtk.org/index.php/RTK/Scripts/FDK
>
> This was somewhat successful - I think. I could generate some
> projections, and reconstruct them. However, it just looks like an egg
> and not like a Shepp Logan phantom. See attachment.
>
> However, I'm unsure if this is expected or not. I took some homemade
> projections (of a small cylinder) and converted them into a MHA file
> (using rtkprojections.exe). The file looks correct in ImageJ. The
> dimensions are 370 pixels * 195 pixels * 361 projections
>
> You can get the file here:https://www.dropbox.com/s/p8tsgsh5xxb468f/cylinder.mha?dl=0
>
> The problem is that the reconstruction is wrong (see cylinder_recon).
> It looks like the dimensions are not read correctly, but I am unsure
> how I fix that? The rtkfdk.exe has a single --dimension parameter, but
> I am unsure which dimension that is suppose to be, but neither 195,
> 370 or any other value I could think of works for me.
>
> I hope someone can help me in the right direction.
>
> best
>
> Arvid
>
>
>
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