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<div class="moz-cite-prefix">Le 15/05/2019 à 15:14, Ferrer Ludovic a
écrit :<br>
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<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB">Hi
Simon,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB">Thank
you for your response.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB">So,
cdf file format doesn’t need to be time sorted ?</span></p>
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<br>
In histogram mode, no, because all events (histogram bins) have the
same time flag.<br>
In your case, projections are histogrammed counts.<br>
<br>
<blockquote type="cite"
cite="mid:851698bf1ffd4ce0b8c016cf2418b932@ico.unicancer.fr">
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<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB">That
means that I can treat each projection sequentially and fill
the binary cdf file according to the format provided in the
documentation, doesn’it ?</span></p>
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</blockquote>
<br>
Yes absolutely.<br>
<br>
<blockquote type="cite"
cite="mid:851698bf1ffd4ce0b8c016cf2418b932@ico.unicancer.fr">
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<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB">I
am not sure what ‘un-normalised scatter intensity’ is about
and how to compute this value. This relates to the question
: “how do we deal with projections centered in scatter
windows ?”.
</span></p>
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</blockquote>
<br>
If you have projections of a scatter window, then you can use them
to correct for scatter.<br>
This means that you can include them as the 'un-normalised scatter
rate', so for histogram data, you just divide the estimated scatters
by the time of the acquisition.<br>
'Un-normalised' means subject to the same intrinsic sensitivity of
the detectors.<br>
It is more related to PET where the scatters are usually obtained
from a method that does not take non-uniformity of sensitivity into
account.<br>
<br>
<blockquote type="cite"
cite="mid:851698bf1ffd4ce0b8c016cf2418b932@ico.unicancer.fr">
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<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB">I
guess also that the normalization factor embedded in 4<sup>th</sup>
position is a way of calibrating images in terms of what
suits your need. But just a bet.</span></p>
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</blockquote>
<br>
Again, it is more related to PET, or to pixelated SPECT detectors,
but not to standard monolythic SPECT detectors.<br>
<br>
<blockquote type="cite"
cite="mid:851698bf1ffd4ce0b8c016cf2418b932@ico.unicancer.fr">
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<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB">Ludovic<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-GB"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span
style="color:windowtext;mso-fareast-language:FR">De :</span></b><span
style="color:windowtext;mso-fareast-language:FR">
Castor-users
<a class="moz-txt-link-rfc2396E" href="mailto:castor-users-bounces@lists.castor-project.org"><castor-users-bounces@lists.castor-project.org></a>
<b>De la part de</b> Simon Stute<br>
<b>Envoyé :</b> mercredi 15 mai 2019 10:39<br>
<b>À :</b> <a class="moz-txt-link-abbreviated" href="mailto:castor-users@lists.castor-project.org">castor-users@lists.castor-project.org</a><br>
<b>Objet :</b> Re: [Castor-users] SPECT reconstruction<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Hi Ludovic,<br>
<br>
This datafile converter from CASToR is indeed related to
ROOT and is adapted to GATE simulated data only.<br>
<br>
So you will have to build your own converter.<br>
<br>
To do so, you will have to decode the format of the original
SPECT data. It is usually DICOM, so easy to do, but you have
to search through the many DICOM header entries to get all
you need.<br>
Then, all relevant information about the SPECT castor
datafile format is included in the documentation, for both
binary cdf and ascii header cdh files.<br>
You will have to create a program to do the reading,
convertion and writing.<br>
<br>
Cheers<br>
Simon<br>
<br>
Le 14/05/2019 à 23:12, Ferrer Ludovic a écrit :<span
style="font-size:12.0pt;mso-fareast-language:FR"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB">Dear castors,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">I would like to use
castor to reconstruct SPECT images.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">I understand from the
documentation that you should provide a cdh file along
with a bunch of options. But, how this cdh file is related
to my acquired SPECT images is not clear.
</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Is this cdf file
created by castor-DataFileConverter ? If yes, this
application is absent from the binary distribution I got
from internet (windows x64 version). I also compiled from
sources but it was also absent as a binary file. Is it
related to the fact that I don’t have ROOT installed in my
system (windows 10) ?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Could you shed lights
on this please ?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Cheers</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Ludovic</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-fareast-language:FR"><br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Castor-users mailing list<o:p></o:p></pre>
<pre><a href="mailto:Castor-users@lists.castor-project.org" moz-do-not-send="true">Castor-users@lists.castor-project.org</a><o:p></o:p></pre>
<pre><a href="https://smex12-5-en-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=http%3a%2f%2flists.castor%2dproject.org%2flistinfo%2fcastor%2dusers&umid=9f95c945-b8c1-4b5d-a0c0-ac9a42a15b4c&auth=5e43a6c06f9b1310984b164e6a5e1f834764f5a0-7117dbebff5bbbc7deaf473692f83a7e86369b21" moz-do-not-send="true">http://lists.castor-project.org/listinfo/castor-users</a><o:p></o:p></pre>
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