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<div class="moz-cite-prefix">Dear Milan,<br>
<br>
Yes, in the new future version, it would be possible, but not for
the moment. And it could solve your problem.<br>
<br>
I think about another solution for you that you could readily
implement with the current version of CASToR.<br>
First, you define your rotation step of the detector, then for
each step, you compute the position of your crystals and you write
them in a custom LUT file for PET scanner descriptions. Finally,
for each of your event, you associate it with the index of the
crystal at the associated rotation step.<br>
In other words, you build a kind of pseudo-cylindrical PET scanner
for a given rotation step.<br>
<br>
Best<br>
Simon<br>
<br>
Le 28/06/2018 à 08:23, Milan Zvolsky a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:7e194bf3-1bc3-658d-1d09-26e753b5c66c@imt.uni-luebeck.de">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<p>Dear Simon,</p>
<p>thank you for your quick reply.</p>
<p>Actually, discrete movement management would be totally fine
for me, I can always adapt my measurement procedure (or make the
discrete time steps as small as my computing power allows).</p>
<p>In this case, if I I understand your answer correctly, I could
have a static detector and a moving phantom (discrete rotation
and translation steps).</p>
<p>Is this realisable within CASToR now or in the new future, or
which modifications would I need to perform?</p>
<p>Thanks for your support.</p>
<p>Milan<br>
</p>
<br>
<div class="moz-cite-prefix">Am 27.06.2018 um 11:54 schrieb Simon
Stute:<br>
</div>
<blockquote type="cite"
cite="mid:6f2454be-5a3e-c9b3-3709-87a9d5cedcb6@cea.fr">
<div class="moz-cite-prefix">Hi Milan,<br>
<br>
Thanks for your interest into CASToR !<br>
<br>
The next release will not contain detector movements, only
movements of the patient.<br>
<br>
Anyway, whatever the movement we are talking about, it is
always considered in a discrete sense (opposite to
continuous).<br>
<br>
There are no solutions yet in the iterative reconstruction
world to implement a reconstruction with continuous time
management, because everything is algebraic and is by
definition discrete. In your case, you may consider the image
as unique over the whole revolution of your detectors, but you
will need the sensitivity image as a continuous function of
the time, which is hardly computable.<br>
<br>
However, this is a very interesting question that remains to
be solved and would make an interesting area of research, but
it is a stand-alone research project on its own, to my
opinion.<br>
<br>
Even Siemens with their continuous PET bed motion does not
implement a continuous reconstruction and cut the acquisition
into "chuncks" which roughly correspond to discrete bed
positions.<br>
<br>
All the best !<br>
Simon<br>
<br>
<br>
Le 27/06/2018 à 11:35, Milan Zvolsky a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:9D16B4C1-29C2-4E09-A3D0-AA2A6773596E@imt.uni-luebeck.de">
Dear CASToR developers & users,
<div class=""><br class="">
</div>
<div class="">I just started using CASToR very recently, so
maybe my questions are ignorant.<br class="">
<div class=""><br class="">
</div>
<div class="">I am simulating a PET system with GATE,
consisting of two opposite modules on a cylindricalPET
geometry. Now, I want to rotate the two modules during the
acquisition, both continuous rotation as well as distinct
rotation steps, and move them in z (or move the phantom
along z).</div>
<div class="">I want to reconstruct the data using MLEM
(either list-mode or histogram).</div>
<div class=""><br class="">
</div>
<div class="">There will also be an experimental realisation
of this setup, whose data I would like to reconstruct with
CASToR.</div>
<div class=""><br class="">
</div>
<div class="">
<div class="">In your 2.0 release notes, you already refer
to a future release including dynamic aspects, incl
motion management.</div>
</div>
<div class=""><br class="">
</div>
<div class="">Does this comprise detector movement?</div>
<div class="">Obviously, I could also translate the detector
movement into a phantom movement and static detectors, if
this helps.</div>
<div class=""><br class="">
</div>
<div class="">If yes, could you give a rough estimate when
this release can be expected? Or would it be possible to
get any non-released code (sth like a development branch)?</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Or are there other possibilities already now,
how to incorporate detector movement?</div>
<div class="">Ideally, I would like to give CASToR a
tracking file which defines the position of the modules
(or of each crystal) for different time stamps.</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Best regards, and thanks for your support,</div>
<div class=""><br class="">
</div>
<div class="">Milan</div>
</div>
<div class=""><br class="">
</div>
<div class="">
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<pre class="moz-signature" cols="72">--
Dr. Milan Zvolský
Universität zu Lübeck
Institut für Medizintechnik
Tel +49 451 3101 5466
<a class="moz-txt-link-abbreviated" href="http://www.imt.uni-luebeck.de" moz-do-not-send="true">www.imt.uni-luebeck.de</a>
Bld. 64, R. 1.24
Ratzeburger Allee 160
23562 Lübeck </pre>
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