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<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">
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<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">www.imt.uni-luebeck.de</a>
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Ratzeburger Allee 160
23562 Lübeck </pre>
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