Re: [ITK-users] TwoProjectionRegistration

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Hi Gabriele,

we have migrated away from this mailing list and to the forum
<https://discourse.itk.org/>. Please repost your question there.

Regards,
D=C5=BEenan

On Mon, Jun 17, 2019 at 9:01 AM Gabriele Belotti <
[email protected]> wrote:

> Dear all,
>
> I=E2=80=99m testing this particular module to evaluate a 2D/3D registrati=
on
> context.
> I was able to obtain DRRs using Siddon-Jacobs ray tracing method (startin=
g
> point is an FDK of POPI model) and as a proof of concept I fed two of the=
se
> resulting projections (first at the correct angles and centering, then at
> small tilted angles with added displacement to the CT volume center).
> What I noticed is that the computation of a single step in the
> registration is incredibly slow even in the case where the initial
> transform is already at the correct position (around 60=E2=80=9D).
> I think the long computation times are possibly caused by metric
> calculation on the 2 Projections vs the DRRs generated from the volume by
> the interpolators (Siddon-Jacobs), but I cannot verify this assumption
> since I can only observe a full registration step.
>
> Is there a way to speed up the process? Unfortunately the custom classes
> that were implemented in this module do not come with many useful tools
> such as a Sampling Strategy.
>
> Thanks to anyone contributing
> The ITK community is transitioning from this mailing list to
> discourse.itk.org. Please join us there!
> ________________________________
> 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.php
>
> Please keep messages on-topic and check the ITK FAQ at:
> http://www.itk.org/Wiki/ITK_FAQ
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:verdana,=
sans-serif;font-size:small">Hi Gabriele,</div><div class=3D"gmail_default" =
style=3D"font-family:verdana,sans-serif;font-size:small"><br></div><div cla=
ss=3D"gmail_default" style=3D"font-family:verdana,sans-serif;font-size:smal=
l">we have migrated away from this mailing list and to the <a href=3D"https=
://discourse.itk.org/">forum</a>. Please repost your question there.</div><=
div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;font-si=
ze:small"><br></div><div class=3D"gmail_default" style=3D"font-family:verda=
na,sans-serif;font-size:small">Regards,</div><div class=3D"gmail_default" s=
tyle=3D"font-family:verdana,sans-serif;font-size:small">D=C5=BEenan</div></=
div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On=
 Mon, Jun 17, 2019 at 9:01 AM Gabriele Belotti &lt;<a href=3D"mailto:gabrie=
[email protected]">[email protected]</a>&gt; wrote:<b=
r></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"IT">
<div class=3D"gmail-m_-834556562704775084WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Dear all,<br>
<br>
I=E2=80=99m testing this particular module to evaluate a 2D/3D registration=
 context.<br>
I was able to obtain DRRs using Siddon-Jacobs ray tracing method (starting =
point is an FDK of POPI model) and as a proof of concept I fed two of these=
 resulting projections (first at the correct angles and centering, then at =
small tilted angles with added displacement
 to the CT volume center).<br>
What I noticed is that the computation of a single step in the registration=
 is incredibly slow even in the case where the initial transform is already=
 at the correct position (around 60=E2=80=9D).<br>
I think the long computation times are possibly caused by metric calculatio=
n on the 2 Projections vs the DRRs generated from the volume by the interpo=
lators (Siddon-Jacobs), but I cannot verify this assumption since I can onl=
y observe a full registration step.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Is there a way to speed up the =
process? Unfortunately the custom classes that were implemented in this mod=
ule do not come with many useful tools such as a Sampling Strategy.<br>
<br>
Thanks to anyone contributing<u></u><u></u></span></p>
</div>
</div>

The ITK community is transitioning from this mailing list to <a href=3D"htt=
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Kitware offers ITK Training Courses, for more information visit:<br>
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<br>
Please keep messages on-topic and check the ITK FAQ at:<br>
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Follow this link to subscribe/unsubscribe:<br>
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</blockquote></div>

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The ITK community is transitioning from this mailing list to discourse.itk.org. Please join us there!
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Kitware offers ITK Training Courses, for more information visit:
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