<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=GB2312" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> Hi Guifen, the sinogram you sent me is not correct and shows the horseshoe shape. It does not correspond to the sinogram I obtained when I ran your macro. In the macro you sent me, the source was NOT at the center !!! and the shape was a regular sinus curve. Claude Guifen Lin wrote: <blockquote cite="mid655033.95288.qm@web15706.mail.cnb.yahoo.com" type="cite"> <div>Hi,Claude</div> <div>Sorry I am bothering you again. For a point source at (0,0,0),does you produce some 2D sinograms with  a straight line in the centra of  the sinogram and without shifted to the left and right? Does your reconstructing image is a point without showing horseshoe shape ?I send you my sinograms data to you ,and you tell me whether it is correct. I should vertify that me gate system is correct.</div> <div>Thinks for your help!</div> <div>guifen Claude Comtat <a class="moz-txt-link-rfc2396E" href="mailto:claude.comtat@cea.fr"><claude.comtat@cea.fr></a> 写道：</div> <blockquote class="replbq" style="border-left: 2px solid rgb(16, 16, 255); padding-left: 5px; margin-left: 5px;">No, I did not use ifheaders_for_ecat7. I used an ecat7 dedicated software developped by the University of Louvain-la-Neuve, Belgium, (iv_volumetool) to display directly the ecat7 sinogram file generated by GATE. As far as GATE is concerned, there is no problem with your macro and the ecat7 sinogram file is correct. Claude Guifen Lin wrote: > Hi,Claude > > Does you you do as my steps?I means using "ifheaders_for_ecat7" > and than display the sinogram. > guifen > > Claude Comtat <CLAUDE.COMTAT @cea.fr="">写道： > > Hi Guifen, > > I just run your macro. First, your point source is not at the center > (x=0,y=0): > > /gate/source/F18LineSource/gps/centre 10.0 0.0 0.0 cm > > Anyhow, the resulting sinogram (MySinogramFile.S) just looks fine. > I do not see any particular problem. Maybe your problem is related to > the way you display the sinogram. > > All the best, > > Claude > </CLAUDE.COMTAT></blockquote> <hr size="1"><a href="http://cn.mail.yahoo.com" target="blank">抢注雅虎免费邮箱-3.5G容量，20M附件！</a> </blockquote> </body> </html>