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<p>Hi,</p>
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<p>I cannot track back an answer to your questions.</p>
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<p>You definitely have to look at the definition of Michelogram which will allow you to go from a 2D sinogram index to the list of ring pairs that contribute to this sinogram (due to axial compression = "span" in Siemens language) that you will need for castor
conversion.<br>
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<p>Each item of the Z elements represents what is called a segment, which is associated to a certain copolar angle or a range of ring differences.</p>
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<p>If you have access to e7 tools, you should have documentation about that.</p>
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<p>Michelogram definition can be found in many books or educational papers.<br>
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<p>Second question: yes one sinogram is for prompt events in the standard coincidence window and the other one is for delayed coincidences from the delayed window (an estimation of randoms, not randoms themselves).</p>
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<p>Best</p>
<p>Simon<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>De :</b> Castor-users <castor-users-bounces@lists.castor-project.org> de la part de Li, Shenpeng (H&B, Parkville) <Shenpeng.Li@csiro.au><br>
<b>Envoyé :</b> mercredi 4 novembre 2020 06:35<br>
<b>À :</b> castor-users@lists.castor-project.org<br>
<b>Objet :</b> [Castor-users] Data conversion of Sinograms from Siemens mMR</font>
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Dear castor users,</div>
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I am working on the conversion of Siemens mMR data to castor format. I have used e7tools to derive sinograms. The data looks like a 2 volumes 3D sinograms. In each volume, I can see a stack of 3D sinograms on z-axis. Here is the example of the header.</div>
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<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">!INTERFILE</span><br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<div>name of data file := emis_00.s</div>
<div>image data byte order := LITTLEENDIAN</div>
<div>number of dimensions := 3</div>
<div>matrix size [1] := 344</div>
<div>matrix size [2] := 252</div>
<div>matrix size [3] := 837</div>
<div>number of z elements := 127 230 186 142 98 54 127 230 186 142 98 54 </div>
<div>number format := float</div>
<div>number of bytes per pixel := 4</div>
<div>data offset in bytes := 0</div>
<div>scaling factor (mm/pixel) [1] := 2.0445</div>
<div>scaling factor (mm/pixel) [2] := 1.0</div>
scaling factor (mm/pixel) [3] := 2.03125<br>
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<span style="background-color:rgb(255,255,255); display:inline!important">Each item in "<span style="background-color:rgb(255,255,255); display:inline!important">number of z elements"<span> [</span></span>127 230 186 142 98 54<span>] actually represents one
or two (even number) 3D sinograms. It looks like the sinograms generated by different rings. My questions are:</span></span><br>
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<ol>
<li><span style="background-color:rgb(255,255,255); display:inline!important"><span>How can I combine these sinograms into a single 3D sinograms? Then, I can convert it to castor format.</span></span></li><li><span style="background-color:rgb(255,255,255); display:inline!important"><span>The second volume of the data are sinograms of the object. The first one looks like a sinogram of random events. Am I right?</span></span></li></ol>
<div>I appreciate your help.</div>
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<b>Best Regards,</b></div>
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<b>Shenpeng Li</b></div>
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