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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">
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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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