[Gate-users] GateMaterials.db

[Marc Chamberland]

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.

For what it's worth, here's what I use for LYSO:

LYSO:   d=7.36 g/cm3; n=4 ; state=Solid
        +el: name=Lutetium ; f=0.714467891
        +el: name=Yttrium ; f=0.04033805
        +el: name=Silicon; f=0.063714272
        +el: name=Oxygen; f=0.181479788


Of course, you may want to adjust those numbers to fit your own needs.

Marc



__________________________

Marc Chamberland, MSc
PhD candidate
Department of Physics
Carleton University
Ottawa (ON)

On Nov 29, 2013, at 4:03, Michaela Gaens <m.gaens at fz-juelich.de<mailto:m.gaens at fz-juelich.de>> wrote:

Hello,

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 ;))

If you want to adapt the values to your situation, you should make sure to change the ratio accordingly as well.

Hope this helps.

Michaela

On 11/29/2013 09:41 AM, 신한백 wrote:
Dear gate users

I have a question about the gatematerial.db in the gate v6.2 directory.

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.
Is the density of LYSO correct or the modify the this property.

I am highly appreciated if anyone can help me!



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Han Baek Shin, M.S. Candidate

MiRe (Molecular Imaging Research & Education) Lab.
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