[Gate-users] Gate-users Digest, Vol 33, Issue 15

José Ramos joserm84 at gmail.com
Sat Feb 21 23:34:51 CET 2009

Hi Peter

The sensitivity varies by the phantom form, if you used a cylindrical
phantom, the result will varies with respect to a spherical phantom
(remember the geometrical efficiency)
In a complete Gate simulation, is preferable to disable the optical option
because the time of the simulation is so longer, so the information about
the optical properties is no needed unless you will simulate the optical
Gate take in count the hits (energy, position, time, ...) only in the
crystalSD, so the optical fiber only is used like a dispersion volume (if
you design it). Check the user's guide for more information, but I hope that
the information given before will help you.

Best regards

2009/2/21 <gate-users-request at lists.healthgrid.org>

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> Today's Topics:
>   1. Simulation of a MicroPET II (Peter Stenk)
> ----------------------------------------------------------------------
> Message: 1
> Date: Fri, 20 Feb 2009 21:58:22 +0100
> From: "Peter Stenk" <tigerspost at gmx.de>
> Subject: [Gate-users] Simulation of a MicroPET II
> To: gate-users at lists.healthgrid.org
> Message-ID: <20090220205822.14370 at gmx.net>
> Content-Type: text/plain; charset="iso-8859-1"
> Hello!
> I'm very new to Gate and I have solved quite some problems on my own. I
> think geant4.9.1 and gate_v4.0.0 is installed properly by now and I try to
> simulate a MicroPET II scanner.
> I got some information about the geometry of this scanner so I think I
> built it correct. (30 rsectors, 3 submodules per rsector, 14x14 crystals
> with a diameter of 160mm and axial length of 49mm. The recursive_test says,
> no overlapping, everything fine)...
> The problem is, I did some tests and I got a sensitivity of less than 1% in
> the center of the scanner. But as far as my information tells, it should be
> around 2.26%
> I still did not find out, how to program the following part of the scanners
> description: "A barium sulphate reflector material was used between LSO
> elements leading to a detector pitch of 1.15 mm in both axial and transverse
> directions. Fused optical fibre bundles were made from 90 ?m diameter glass
> fibres with a numerical aperture of 0.56." Would this make such a great
> difference? How do I get the material information of the barium sulphate
> reflector material?
> Is there anyone who already did manage to simulate the MicroPET II?
> Thanks for your help.
> Peter
> P.S.: Here is an abstract that contains some information on the MicroPET
> II: http://www.iop.org/EJ/abstract/0031-9155/48/11/303
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> End of Gate-users Digest, Vol 33, Issue 15
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