[Castor-users] Random factor query

[Alberto Sánchez-Pastor Gomis]

Dear all,

I would like to apologize for not being able to figure this out but, how do
the random corrections work in CASToR?

I've seen that there is the option of providing a file containing the
"randoms correction factors" and that the PET data formats can include the
random intensity rates but is this based around the calculation from the
singles' rates or is this applicable to the delayed window method? And what
do "randoms correction factors" represent? Is it the fraction of counts in
an LOR that you expect to be random counts?

Additionally I would like to mention that I believe that there is a bug in
the sensitivity calculation when using the "min angle difference" other
than 0. I was attempting to implement a scanner using 8 rectors and a min
angle difference of 90 but it just meant that the sensitivity dropped in an
angular section of 90 deg of the FOV leaving it asymmetrical.

Regards,
Alberto Sanchez
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