[Gate-users] SetTimeStop vs Dose(mGy)

[Emmanuel Marfo]

Dear Sir,

Thanks for the information. Please, I was using the  acquisition protocol

:
/gate/application/setTimeStart  0. s
/gate/application/setTimeSlice  1  s
/gate/application/setTimeStop   10. s
/gate/application/start
For dosimetry in CT where I have employed helical scanning in my simulation. Because I wanted to measure dose for different Timestop say 10 s, 30 s or 50 s at fixed TimeSlice to verify how the setTimeStop has an influence on the dose. That made me had the same results.  I will use your first suggested option and report the feedback later. However, I am not sure which of the option is ideal for my case.
First

/gate/application/setTimeStart  0. s
/gate/application/setTimeSlice  1  s
/gate/application/setTimeStop   10. s
/gate/application/startDAQ
Thanks.

Best regards,
Emmanuel Marfo
________________________________
From: David Sarrut <David.Sarrut at creatis.insa-lyon.fr>
Sent: Tuesday, 22 August 2017 7:11:46 p.m.
To: Emmanuel Marfo
Cc: gate-users at lists.opengatecollaboration.org
Subject: Re: [Gate-users] SetTimeStop vs Dose(mGy)

Hello,

there are two ways to start a simulation:

First:
/gate/application/setTimeStart  0. s
/gate/application/setTimeSlice  1  s
/gate/application/setTimeStop   10. s
/gate/application/startDAQ

Will create 10 runs of 1 sec. The number of generated primary particules will depend on the source activity (for example 1MBq, will launch 1M particles every run).

Second :
/gate/application/setTotalNumberOfPrimaries 10000
/gate/application/start

In that case, 10000 particles will be generated, time is not explicit. Under the hood, Gate create a "fake" time structure of a single slice, starting at 0, ending at 1 sec, every particle being timestamp at 1/10000 sec.

HTH,
David



On Mon, Aug 21, 2017 at 11:41 AM, Emmanuel Marfo <emmanuel.marfo at postgrad.otago.ac.nz<mailto:emmanuel.marfo at postgrad.otago.ac.nz>> wrote:

Hi GATE users,

Please, can someone help me to understand how the acquisition parameters such as Timeslice, TimeStart and TimeStop in GATE actually work? I learnt is equivalent to real time experiment. Currently, at constant Timeslice say 0.26 s, I vary the TimeStop say 30 60, 90 s etc. I expected my dose(mGy) values to increase but the dose(mGy) actually remain the same. Is it a bug in my simulation making me to get the same results or I am wrongly implementing the acquisition parameters. Thanks.


Best regards,

Emmanuel Marfo

Student

University of Otago

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CREATIS, UMR CNRS 5220, Inserm U1206
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