[gate-users] sensitivity problem GAMMA CAMERA DSX

[Galluccio Ludovic]

Hi,
I try to modelize a DSX gamma camera with a parallel
collimator. I think i've done it and the recursive
test of the geometry doesn't specify an overlap.

I try to study the sensitivity of my system for
different distances between the collimator and the
source (activity 536900 bq, time = 20s). My
sensitivity is always the same even if i change the
blurring (SetResolution 0.15 ; energy of reference 140
keV).
When I've done a simulation with an activity of 53.69
Mbq, my sensitivity was 43.7 whereas with a smaller
activity it's about 62.5.
I don't understand why and maybe my configuration is
wrong.
I put the macros in attachment.

I know that my problem is not really well explained.

Best regards,

GALLUCCIO Ludovic
Faculté de médecine de Nice
Unité TIRO (Transporteurs Imagerie et Radiotherapie en Oncologie)


	

	
		
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