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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=FR link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dear Michael,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>radial : <i>I</i><o:p></o:p></span></p><p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>axial : <i>J</i><o:p></o:p></span></p><p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>azimuthal : <i>K</i><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:red'>You should not store </span><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>your projection data as it is usually done :<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> for (k=0 ;k<K ;k++) for (j=0 ;j<J ;j++) for (i=0 ;i<I ;i++) fwrite(Mat(i,j,k));<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>and then perform an OSEM reconstruction. In CASToR, there is no assumption at all about the organization of the data. The code will read sequentially the data : if there are N subsets, first subset will contain Mat(i=0,j=0,k=0), Mat(i=N,j=0,k=0), Mat (i=2*N,j=0,k=0), … and the resulting subsets will not be well balanced.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You can rather write your matrix as : <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> for (j=0 ;j<J ;j++) for (i=0 ;i<I ;i++) for (k=0 ;k<K ;k++) fwrite(Mat(i,j,k)) ;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Then, first subset will contain Mat(i=0,j=0,k=0), Mat(i=0,j=0,k=N), Mat(i=0,j=0,k=2*N), … and the resulting subsets will be better balanced.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I did not get your figure 9.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Best,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Claude<o:p></o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-GB style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De :</span></b><span lang=EN-GB style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Michael Ljungberg [<a href="mailto:michael.ljungberg@med.lu.se">mailto:michael.ljungberg@med.lu.se</a>] <br><b>Envoyé :</b> mardi 25 avril 2017 08:18<br><b>À :</b> COMTAT Claude<br><b>Objet :</b> Re: [Castor-users] SPECT reading Interfile<o:p></o:p></span></p></div></div><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>Hi Claude<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>Sorry but I am still puzzle about this. You mentioning I should write the histogram events with the inner loop over the radial or axial coordinate. Radial – what does this mean? Next sentences mention the azimuthal coordinate. What does this mean relative to the previous question? <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>I have a float matrix Mat(I,J,K) where I,J is the projections bins for a specific SPECT camera position (projection ID ) K. The index I goes from left to right and J goes axially from the patient head and down. <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>From Figure 9 it looks like I need to flip the axial orientation because you start from the legs and goes to head (lower left corner to upper left corner for the axial rows. <o:p></o:p></span></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>Any clarification about how to write the dafa file based on the above would be very helpful because the osem if of course of interest to be able to use.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>Hälsningar / Best regards<o:p></o:p></span></p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>Michael<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p> </o:p></span></p></div></div></body></html>