[Gate-users] projection output from GATE

[Park MinJae]

Dear Kathy, 

This means the total rotation is 360 degrees, each head viewing 180 degrees
-> correct

but, 360/3 = 120 projections per each detector
so, 120 * 2(dual head) = 240 projection is correct

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-----Original Message-----
From: gate-users-bounces at lists.healthgrid.org
[mailto:gate-users-bounces at lists.healthgrid.org] On Behalf Of
kathy at physics.usyd.edu.au
Sent: Friday, October 05, 2007 10:50 AM
To: Hannes Hofmann
Cc: gate users
Subject: [Gate-users] projection output from GATE

Hello all,

I'm wondering if someone can clear up a few questions I have re the
projection output from GATE.

I'm working with a double headed SPECT model with the following parameters
for run-time:

speed = 0.5 deg/sec
time slice = 3 sec
total run time = 360 sec

This means the total rotation is 360 degrees, each head viewing 180 degrees.
I would have thought that this would produce 120 projections, however I am
getting 240. It also appears in the header that the info is written
separately for each head. Has anyone had some experience with this that can
help? It seems that any info in the hdr is contradictory in that the time
per projection multiplied with the number per projection will not give the
run time. Or else I am (very possibly) mis-understanding.

Thanks so much for any help,

Kathy

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