[Castor-users] Random factor query

[niccolo camarlinghi]

Dear Alberto Sanchez,

I think that the issue you are facing with the sensitivity is the same bug
I was experiencing and that was solved one week ago by Thibaut in the
latest castor version (1.12).
If you received the previous messages of the mailing list you should be
able to find it.

Best regards

Niccolo'


2017-07-04 12:05 GMT+02:00 Alberto Sánchez-Pastor Gomis <
asanchezpastorgomis at gmail.com>:

> 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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>
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