<HTML dir=ltr><HEAD> <META http-equiv=Content-Type content="text/html; charset=unicode"> <META content="MSHTML 6.00.6000.16587" name=GENERATOR></HEAD> <BODY> <DIV id=idOWAReplyText7292 dir=ltr> <DIV dir=ltr><FONT face="Times New Roman" color=#0000ff size=3> <DIV dir=ltr><FONT face="Times New Roman" color=#0000ff size=3>Hello Gilberto,</FONT></DIV> <DIV dir=ltr><FONT color=#0000ff></FONT> </DIV> <DIV dir=ltr><FONT color=#0000ff>I have not tried pinhole but I think it is possible by making one hole as cone shape. You can refer to creating volume section in GATE user guide, there is a table explaining cone shape.</FONT></DIV> <DIV dir=ltr><FONT color=#0000ff></FONT> </DIV> <DIV dir=ltr><FONT color=#0000ff>Good luck</FONT></DIV></FONT></DIV> <DIV dir=ltr><FONT face="Times New Roman" color=#0000ff size=3></FONT> </DIV></DIV> <DIV id=idSignature78218 dir=ltr> <DIV class=MsoNormal RE><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">---------------------------------------------------------------</SPAN></DIV> <DIV class=MsoNormal RE><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Khalid Alzimami</SPAN></DIV> <DIV class=MsoNormal RE><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial"></SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Department of Physics </SPAN></DIV> <DIV class=MsoNormal RE><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial"></SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">School of Electronics & Physical Sciences</SPAN></DIV> <DIV class=MsoNormal RE><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial"></SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">University</SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial"> of </SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Surrey</SPAN></DIV> <DIV class=MsoNormal RE><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial"></SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Guildford</SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">, </SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-STYLE: italic; FONT-FAMILY: Arial"><BR></SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">GU2 7XH</SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial"> </SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-STYLE: italic; FONT-FAMILY: Arial"><BR></SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">UK</SPAN></DIV> <DIV class=MsoNormal RE><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial"></SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">tel. <EM>+44-1483-689423</EM></SPAN></DIV> <DIV class=MsoNormal RE> <DIV class=MsoNormal RE> <DIV RE> <DIV class=MsoNormal RE> <DIV RE> <DIV class=MsoNormal RE> <DIV RE> <DIV class=MsoNormal RE> <DIV RE> <DIV RE> <DIV RE> <DIV RE> <DIV class=MsoNormal RE><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial"></SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-STYLE: italic; FONT-FAMILY: Arial"><SPAN style="FONT-FAMILY: Arial">fax. +44-1483-682724</SPAN></SPAN> </DIV> <DIV class=MsoNormal RE> <DIV RE> <DIV RE> <DIV RE> <DIV RE><PRE></PRE></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV> <DIV dir=ltr><BR> <HR tabIndex=-1> <FONT face=Tahoma size=2><B>From:</B> gate-users-bounces@lists.healthgrid.org on behalf of Gilberto Almeida<BR><B>Sent:</B> Fri 08/02/2008 14:10<BR><B>To:</B> gate-users@lists.healthgrid.org<BR><B>Subject:</B> [Gate-users] pinhole collimator<BR></FONT><BR></DIV> <DIV><BR> <DIV class=gmail_quote> <DIV>Hello gate users,</DIV> <DIV> </DIV> <DIV>I'm a newcomer with GATE, and my first big problem is how to parameterize a pinhole collimator in SPECT Head... I've searched everywhere but haven't found anything... </DIV> <DIV> </DIV> <DIV> I want to parametrize a pinhole with 0.1cm of height, 0.1cm of radius and 30 degrees of acceptance angle. </DIV> <DIV> </DIV> <DIV> I'm using version 3.1.2 of GATE.</DIV> <DIV> </DIV> <DIV> Thank you for your help</DIV><FONT color=#888888> <DIV> </DIV> <DIV>Gilberto Almeida</DIV> <DIV>Instituto de Biofísica e Engenharia Biomédica<BR>Faculdade de Ciências da Universidade de Lisboa<BR>Campo Grande<BR>1749-016 Lisboa, Portugal</DIV></FONT></DIV><BR></DIV></BODY></HTML>