<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Niklas,<div><br></div><div>I actually don't want to suppress the low energy photons and delta rays since I am trying to study some things for CT (X-ray production). I just want to be sure about what Gate is exactly simulatiing, i.e. which energy cuts are really applied.</div><div><br></div><div>Cheers,</div><div><br></div><div>Peter</div><div><br></div><div><br><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Date: Wed, 08 Oct 2008 14:15:40 +0200<br>From: "Niklas Rehfeld" <<a href="mailto:rehfeld@imnc.in2p3.fr">rehfeld@imnc.in2p3.fr</a>><br>Subject: Re: [Gate-users] Energy cuts in v4.0<br>To: <a href="mailto:gate-users@lists.healthgrid.org">gate-users@lists.healthgrid.org</a><br>Message-ID: <op.uipgceosbii9a1@milka><br>Content-Type: text/plain; format=flowed; delsp=yes; charset=utf-8<br><br>Dear Peter,<br><br>Apparently there are indeed problems (but I did not test it myself, so I <br>cannot comment on that).<br><br>In the following special configuration you can definitely suppress low <br>energy photons (but only in the phantom!):<br><br>- voxelized phantom<br>- fictitious tracking (see 7.3.4 in the user's guide)<br>- using the command "setGammaDiscardEnergy"<br><br>This tracking works however not with all processes. Since this cut is not <br>implemented in Geant4, in this special case the Geant4 output might be <br>misleading (i.e. not showing this cut).<br><br>Cheers,<br><br>Niklas<br><br><br><br>On Wed, 08 Oct 2008 13:37:26 +0200, Peter Bruyndonckx <<a href="mailto:pbruynd@vub.ac.be">pbruynd@vub.ac.be</a>> <br>wrote:<br><br><blockquote type="cite">Dear All,<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Last month Guilem mentioned a problem with setting the energy (or range) <br></blockquote><blockquote type="cite">cuts on X-rays in version 3.1.2. Has this been fixed in version 4.0 ? <br></blockquote><blockquote type="cite">When I run version 4.0, it always seems to be set at 0 fm or 990 eV. <br></blockquote><blockquote type="cite">This is what I see on the output :<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Index : 3 used in the geometry : Yes recalculation needed : No<br></blockquote><blockquote type="cite">Material : Lead<br></blockquote><blockquote type="cite">Range cuts : gamma 0 fm e- 10 cm e+ 1 mm<br></blockquote><blockquote type="cite">Energy thresholds : gamma 990 eV e- 437.915 MeV e+ 1.28002 MeV<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">The displayed energy threshold does not change when I change the setting <br></blockquote><blockquote type="cite">in the .mac file.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">The cuts on the electrons and positrons seem to work. I am not sure <br></blockquote><blockquote type="cite">about delta-rays.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Anybody else has some experience with this ?<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Regards,<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Peter<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote></div></div></span></div></span> </div><br></div></body></html>