[Gate-users] How to define illumination time in laser definition

[Somayeh Asadi]

Dear Gate user
I found this paragraph in the gate manual :


During light illumination of a tissue, the thermal heat produced by the optical photons deposited energy does not accumulate locally in the tissue; it diffuses
in biological tissues during illumination. This dynamic effect has been taken into account in the GATE code. The n seconds light illumination simulation is
sampled into p time frame 3D images by setting the simulation parameter setNumberOfTimeFrames to p. Each of the p sample images is diffused for a
duration of [1, 2, ..., p-1] x n/p seconds. The final image illustrating the heat distribution in the tissues at the end of the illumination time is obtained by
adding all diffused images to the last n/p seconds illumination image. This thermal energy (or heat) map will continue to diffuse after illumination by setting
the parameter setDiffusionTime to the value of interest. At a certain point in time after the initial temperature boost induced by nanoparticles, the
temperature of the tissues will go back to its initial value due to diffusion. This boundary condition is taken into account in a post-processing-step of the
GATE simulation.


But I got confused. Does any person know how to define the duration of beam irradiation?
Does "setDiffusionTime" shows the n second of illumination or shows the time after finishing the illumination?
I would be thankful if somebody could help me.

Best


Somayeh Asadi (PhD)
Postdoctoral Researcher
Department of Mechanical Engineering
Politecnico di Milano, Italy

Via Giuseppe La Masa,1
20156 - Milano - Italy
phone: +39 0223998572

somayeh.asadi at polimi.it

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