[Gate-users] Intrinsic spatial resolution of a SPECT system

[Cristian C]

Dear all,

I've simulated a CsI crystal and I'm trying to obtain its intrinsic spatial resolution. For a circular source of 0.5 mm diameter the FWHM of the Gaussian spatial distribution is around 0.42 mm, which disagrees with the experimental value for a CsI(Na) crystal. I've tried to change the intrinsic resolution of my detector through the following lines:

/gate/digitizer/Singles/insert spblurring
/gate/digitizer/Singles/spblurring/setSpresolution 2.0 mm

However, even if I use 1 cm for the spatial resolution, I get the same result (0.42 mm). My questions is: can I change the intrinsic spatial resolution of my detector or is it fixed for a given composition of the crystal? If possible, how can I do it?

In advance, thank you very much.
Cristian.