<!doctype html public "-//W3C//DTD W3 HTML//EN"> <html><head><style type="text/css"></style><title>Re: [Gate-users] investigating the spatial resolution</title></head><body> <div>Dear Martin,</div> <div><br></div> <blockquote type="cite" cite>let me first thank the developers for this very nice tool which allowed me to define a complete PET detecter in just a couple of days! Starting from scratch with GEANT4 would have been much more time consuming.<br> </blockquote> <blockquote type="cite" cite>I want to determine the spatial resolution of my system. How would you approach this problem and what are the figures of merit to quote which can be used for comparisons to other systems? So far I looked at the FWHM of a point source. Are there standard phantoms or sources defined which can be used for this purpose?</blockquote> <div><br></div> <div>You should use the NEMA NU2-2007 standard : <font face="Lucida Grande" size="+2" color="#000000"> http://www.nema.org/stds/nu2.cfm</font></div> <div><br></div> <blockquote type="cite" cite>I would like to ask you if you know of any comprehensive software tool which allows me to reconstruct images from a sinogram. I read a few articles and wrote an own reconstruction but surely there a quite sophisticated methods and algorithms on the market. I found a package called ASPIRE. Do you have experiences with that package</blockquote> <blockquote type="cite" cite><br></blockquote> <div><br></div> <div>You might be willing to use the STIR library :<font face="Lucida Grande" size="+2" color="#000000"> http://sourceforge.net/projects/stir/</font></div> <div><br></div> <div>Good luck,</div> <div><br></div> <div>Irene</div> <x-sigsep><pre>-- </pre></x-sigsep> <div>-------------------------------<br> Irene Buvat, PhD<br> Equipe "Imagerie in vivo de la perfusion et des échanges moléculaires"<br> http://www.guillemet.org/irene/equipe4<br> U678 INSERM<br> CHU Pitie-Salpetriere<br> 91 Boulevard de l'Hopital<br> 75 634 Paris Cedex 13<br> France<br> <br> Tel : (33) (0)1 53 82 84 19<br> Fax : (33) (0)1 53 82 84 48<br> e-mail : buvat@imed.jussieu.fr<br> http://www.guillemet.org/irene</div> </body> </html>