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<p class="MsoNormal">Dear Didier<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you for your explanation. I think it will not be a major problem to implement. For SPECT reconstructions, does the Time value be clearly defined?
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Another related question regards the files for the system. I wonder if it would be possible to allow castor-recon program to first look in the local folder for a geometry file before looking in the standard SYSTEM location? If I implement
direct writing to the caster format in the simind program, I can foresee that the SYSTEM folder can be quickly filled with files. Alternatively, is it possible to add a path to the system name in the cdh file?<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">Hälsningar / Best regards<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">Michael<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">Castor-users <castor-users-bounces@lists.castor-project.org> on behalf of Didier Benoit <didier.benoit@inserm.fr><br>
<b>Date: </b>Tuesday, 18 April 2017 at 14:52<br>
<b>To: </b>"castor-users@lists.castor-project.org" <castor-users@lists.castor-project.org><br>
<b>Subject: </b>Re: [Castor-users] SPECT reading Interfile</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Times New Roman""><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Dear Michael,<span style="color:#222222"><br>
<br>
Thanks for your interest. Interfile format is only used as input/output format for image (not projection data). As you have seen, input data for SPECT (and also for PET) is composed of 2 files: a header file (*.Cdh) and a binary file (*.Cdf) storing the data
from a machine or a Monte Carlo simulation. Here is some information about this Cdf file. This file is not a pure histogram (a successive number of counts by bin). The Data should (must) be arrange as described in the “CASToR general documentation” page 30.</span><br>
<br>
For instance, in the case of a 64x64 float matrix for 64 angles (and I consider you don't have both normalization and scatter informations), your Cdf file should contain 262 144 events (64x64x64) with the following format:<br>
<br>
EVENT 0:<br>
time: 0 (uint32_t)<br>
data: 32 (float/double) it's your data for a specific bin<br>
projection ID: 0 (uint32_t) it's the angle ID between 0 and 63 in this example<br>
binID: 0 (uint32_t) it's the bin ID between 0 and (64x64 – 1) in this example<br>
<br>
We don't provide a SPECT/PET data converter, but the easiest way to create a correct Cdf file (I consider you are using C/C++) is to create a struct like this:<br>
<br>
struct SPECT_CASTOR_EVENT_FORMAT {<br>
uint32_t time;<br>
float data;<br>
uint32_t projectionID;<br>
uint32_t binID;<br>
};<br>
<br>
and store each bin from your data in the CASToR event format.<br>
<br>
Kind Regards,<br>
Didier Benoit<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal">On 04/14/2017 05:34 PM, Michael Ljungberg wrote:<o:p></o:p></p>
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<p class="MsoNormal">Dear Castor developers<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I ran into this release a week ago and it is really a nice contribution you have made. I have been working with Monte Carlo simulations for many years developing the program simind and often I get this question of supplying reconstruction
software since simind only produce projections. So being able to direct to your webpage would be natural.
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">However, I dont understand how to read data into castor-recon. I also use Interfile and float values so when reading in the manual at you are using interfile for both input data and output gave me confidence for a smooth connection. But
I dont see how to actual do this. I checked the spect benchmark file but the cdh format is different. So my question is how I can read in for example a 64x64 float matrices for 64 angles stored in a data file and with an associated interfile header file.<o:p></o:p></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">Hälsningar / Best regards</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">Michael Ljungberg</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">Lund University</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">Sweden</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";mso-fareast-language:EN-GB"><br>
<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">Castor-users@lists.castor-project.org</a><o:p></o:p></pre>
<pre><a href="http://lists.castor-project.org/listinfo/castor-users">http://lists.castor-project.org/listinfo/castor-users</a><o:p></o:p></pre>
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<p class="MsoNormal"><span style="font-family:"Times New Roman";mso-fareast-language:EN-GB"><br>
<br>
<o:p></o:p></span></p>
<pre>-- <o:p></o:p></pre>
<pre>-------------------------------------------------------------------------------<o:p></o:p></pre>
<pre>Didier BENOIT, PhD,<o:p></o:p></pre>
<pre>Laboratoire de Traitement de l'Information Médicale (LaTIM - INSERM UMR 1101)<o:p></o:p></pre>
<pre>CHRU Morvan, bâtiment 1, étage 1<o:p></o:p></pre>
<pre>5 Avenue Foch<o:p></o:p></pre>
<pre>29609 Brest<o:p></o:p></pre>
<pre>FRANCE<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>E-mail:<o:p></o:p></pre>
<pre><a href="mailto:didier.benoit@univ-brest.fr">didier.benoit@univ-brest.fr</a><o:p></o:p></pre>
<pre><a href="mailto:didier.benoit@inserm.fr">didier.benoit@inserm.fr</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Tél: +33 (0)2 98 01 81 96<o:p></o:p></pre>
<pre>-------------------------------------------------------------------------------<o:p></o:p></pre>
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