[Gate-users] quarter-sphere PET scanner (Amir Ghabrial)

Bryan McIntosh mcintoshster at gmail.com
Wed Dec 20 15:37:14 CET 2017

Hi Amir,

Thinking briefly and without doing any testing, there are two approaches I
can think of that would probably work.

The first and easiest is to simulate the entire sphere, then discard any
data from the rest of the sphere that is in the regions that would not be
physically present. This would be relatively easy to do in your data
analysis since you would just exclude detector data if the rsector (or
equivalent) number is not within a certain range. The tradeoff to this is
that your simulation would take longer than it would for simply a
quarter-sphere, since it's calculating interactions for parts of the system
that you will be discarding. The final data file size will be a great deal
larger as well.

The second approach would be to use the generic "scanner" architecture and
place the detector segments in the world manually. This would require some
very careful planning and use of the visualization system to verify that
you've placed the segments properly in your quarter-sphere arrangement, but
the simulations themselves would run more quickly.

I hope this is helpful!


On Wed, Dec 20, 2017 at 5:00 AM, <
gate-users-request at lists.opengatecollaboration.org> wrote:

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> Date: Tue, 19 Dec 2017 15:48:47 +0000
> From: Amir Ghabrial <eng_amir_shawky at hotmail.com>
> To: "gate-users at lists.opengatecollaboration.org"
>         <gate-users at lists.opengatecollaboration.org>
> Subject: [Gate-users] quarter-sphere PET scanner
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> Content-Type: text/plain; charset="iso-8859-1"
> Dear all
> I just want to add a block detectors on a quarter-sphere scanner so how I
> can do that while there are only linear and ring repeaters.
> I tried the sphere repeater but it doesn't work and give me an error, as
> it only repeats the whole sphere and I want to simulate just a quarter of a
> sphere.
> Thank you all for your time and Considerations
> Kind regards,
> Amir Ghabrial
> PhD Research Student
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