<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7036.0"> <TITLE>Positron annihilation distance</TITLE> </HEAD> <BODY>  <P ALIGN=LEFT><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">Hi,</FONT></SPAN></P> <P ALIGN=LEFT><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">I have trouble to understand</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">the</FONT> <FONT SIZE=4 FACE="Arial">positron</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">-</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">range results</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">generated</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">with</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial"> G</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">ATE</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">.</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">M</FONT><FONT SIZE=4 FACE="Arial">aybe</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial"> someone here</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">can give me some</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">advices</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">.</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial"> </FONT></SPAN></P> <P ALIGN=LEFT><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">For F18,</FONT> <FONT SIZE=4 FACE="Arial">t</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">he positron range distribution</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">(see attached</FONT> <FONT SIZE=4 FACE="Arial">gif figure</FONT><FONT SIZE=4 FACE="Arial">)</FONT> <FONT SIZE=4 FACE="Arial">show</FONT><FONT SIZE=4 FACE="Arial">s a</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">n unexpected</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial"> peak</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">between 1 and 2</FONT><FONT SIZE=4 FACE="Arial"></FONT> <FONT SIZE=4 FACE="Arial">mm</FONT><FONT SIZE=4 FACE="Arial">, which is not present in published literature</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial"> (Levin and Hoffman</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">,</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">Craig S Levin and Edward J Hoffman 1999 Phys. Med. Biol. *44* 781-799</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">;</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> </SPAN><A NAME=""><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">Laforest R, Rowland DJ, Welch MJ. 2002. MicroPET imaging with nonconventional isotopes.</FONT> <FONT SIZE=4 FACE="Arial">IEEE Trans Nucl Sc</FONT><FONT SIZE=4 FACE="Arial">i</FONT><FONT SIZE=4 FACE="Arial"></FONT> <FONT SIZE=4 FACE="Arial">4</FONT><FONT SIZE=4 FACE="Arial">9</FONT></SPAN></A><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">, 2119-2126).</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial"> The figure can be easily reproduced by</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">running</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">benchmarkPET scripts</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">,</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial"></FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">just</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">remov</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">e</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial"> the Oxygen15</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">parts in</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">the</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">source</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">s</FONT><FONT SIZE=4 FACE="Arial">.</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">mac</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">.</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial"></FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial"></FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">We saw</FONT> <FONT SIZE=4 FACE="Arial">s</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">imilar results</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">with</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial"> O</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">xygen</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">15.</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> </SPAN></P> <P ALIGN=LEFT><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">T</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">he</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial"></FONT> <FONT SIZE=4 FACE="Arial">GATE version we are using</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">is v1.0.</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial"></FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">I don</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">’</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">t see</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">this issue mentioned</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">in the</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">later version</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">’</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">s</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=4 FACE="Arial">releaseNotes</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">.</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial"></FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> </SPAN></P> <P ALIGN=LEFT><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">T</FONT><FONT SIZE=4 FACE="Arial">hanks in advance</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=4 FACE="Arial">!</FONT></SPAN></P> <BR> <P ALIGN=LEFT><SPAN LANG="en-us"></SPAN><A NAME=""><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Rutao</FONT></SPAN></A><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=2 FACE="Arial">Ya</FONT><FONT SIZE=2 FACE="Arial">o, Ph.D.</FONT></SPAN></P> <P ALIGN=LEFT><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">University at Buffalo</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN></P> <P ALIGN=LEFT><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Arial" SIZE=2 COLOR="#000000"> 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