[gate-users] pinhole SPECT question

[Schmidtlein, Ross/Medical Physics]

Hi Christopher,

Assuming I understand your problem correctly, one way you could get the
results you want is to use the root output.  To do this define the
collimator volume as phantomSD and look in root at the flags for the
various types of scatter.  Any scattered event will have its interaction
flags updated.  To ensure you are counting only particles that pass
through the collimator use sourcePos and globalPos to get the positions
of the birth and death of the particle.  

Hope that helps,

ross

-----Original Message-----
From: gate-users-bounces at lphe1pet1.epfl.ch
[mailto:gate-users-bounces at lphe1pet1.epfl.ch] On Behalf Of Heath,
Christopher Charles
Sent: Thursday, June 10, 2004 5:33 PM
To: gate-users at lphe1pet1.epfl.ch
Subject: [gate-users] pinhole SPECT question



Hello all,
   I am attempting to do some simulations to look at pinhole penetration
and have come across a problem.  Is there any way to set a flag so that
particles passing through a volume but not depositing energy are
recorded i.e. photons that pass through the collimator without
scattering or attenuating?

Thanks,
Christopher

-----------------------------------------------------------------
Heath, Christopher Charles
Vanderbilt University
Email: christopher.c.heath at Vanderbilt.Edu
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