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Just wanted to mention that Michaela is absolutely correct. In fact, I think different scanner manufacturers use different ratio of Lutetium to Yttrium (for patent reasons), so unless you know exactly the composition of your crystal, you'll have to do a bit
of guessing.
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<div>For what it's worth, here's what I use for LYSO:</div>
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<div>LYSO: d=7.36 g/cm3; n=4 ; state=Solid</div>
<div> +el: name=Lutetium ; f=0.714467891</div>
<div> +el: name=Yttrium ; f=0.04033805</div>
<div> +el: name=Silicon; f=0.063714272</div>
<div> +el: name=Oxygen; f=0.181479788</div>
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<div>Of course, you may want to adjust those numbers to fit your own needs.</div>
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<div>Marc</div>
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<div>__________________________</div>
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<div>Marc Chamberland, MSc</div>
PhD candidate<br>
Department of Physics<br>
Carleton University<br>
Ottawa (ON)</div>
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<div>On Nov 29, 2013, at 4:03, Michaela Gaens <<a href="mailto:m.gaens@fz-juelich.de">m.gaens@fz-juelich.de</a>> wrote:</div>
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<div class="moz-cite-prefix">Hello,<br>
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you're right, I have also made the experience that the LYSO definition in the GATE database does not match the properties of the scanner's crystals. However, this does not affect the density alone, it is actually a matter of the ratio of Lutetium to Yttrium
atoms. As far as I remember the mass fractions in the GATE definition correspond to a ratio of 30:70 in the number of Lutetium to Yttrium atoms, while actually a ratio of 90:10 seems to be more common for LYSO (taking these numbers from my head now, so don't
rely on them ;))<br>
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If you want to adapt the values to your situation, you should make sure to change the ratio accordingly as well.<br>
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Hope this helps.<br>
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Michaela<br>
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On 11/29/2013 09:41 AM, 신한백 wrote:<br>
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<div dir="ltr">Dear gate users
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<div>I have a question about the gatematerial.db in the gate v6.2 directory. </div>
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<div>I know that the density of LYSO is the 7.3. But the density in the gatematerial.db is the 5.37. The density of BGO and LSO is 7.13, 7.4 as you know. </div>
<div>Is the density of LYSO correct or the modify the this property. </div>
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<div>I am highly appreciated if anyone can help me! </div>
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-- <br>
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<div><font color="#666666">Han Baek Shin, M.S. Candidate</font></div>
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<div><font color="#666666">MiRe (Molecular Imaging Research & Education) Lab. </font></div>
<div><font color="#666666">Department of Electronic Engineering,<br>
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1, Shinsu-Dong, Mapo-Gu, Seoul, South Korea 121-742 <br>
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Mobile : +82-10-9096-6795</font></div>
<div><font color="#666666">e-mail : <a href="mailto:somni0728@gmail.com" target="_blank">
somni0728@gmail.com</a> </font></div>
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