[Gate-users] What is the meaning of "volumeID" ?

[George Gerganov]

Hi Assen,

Reading the Gate Reference Manual I've figured out that volumeID is an array
of numbers given to each volume in the simulation. Using these numbers one
can tell where the current hit
occured. For example for a PET scanner, volumeID[1] holds the ID of
the rsector for the current hit, volumeID[2] holds the ID of the
module for the current hit and so on.


See this document for more information:
http://opengatecollaboration.healthgrid.org/GATEusers/documentation/REFERENCE_MANUAL/html_v1.0/classGateVSystem.html


The problem is that when this array is written to the .root
file, some kind of compression is applied to it (i suppose) and the numbers
change their
values. And that's why reading the ROOT file, those numbers seemed
meaningless to me. Does
anyone know if there is a way to decompress those values so I can get the
real volumeID information for the hits? Maybe there is a function in ROOT
that does the work.

All the best,
Georgi

On 4/15/07, kirova at mskcc.org < kirova at mskcc.org> wrote:
>
> Hi Georgi,
>
> As far as I remember volumeID is a  number given to each of the volumes
> simulated in the
> phantom or scanner. I think it should be one number per volume. Not sure
> why you see
> 10.  Probably there are 10 volumes total in your geometry, but someone
> else from the list
> may help more.
>
> All the best,
> Assen
>
>
> -----Original Message-----
> From: gate-users-bounces at lists.healthgrid.org on behalf of George Gerganov
>
> Sent: Sat 4/14/2007 2:43 PM
> To: gate-users at lists.healthgrid.org
> Subject: [Gate-users] What is the meaning of "volumeID" ?
>
> Hello everyone,
>
> The Hits tree in the ROOT-output files generated by GATE contains a branch
> called "volumeID". Each leaf is an array of 10 integers. Does anyone know
> what is the meaning of each of these integers?
>
> Thanks in advance,
> Georgi
>
>
>
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