[Gate-users] Gate-users Digest, Vol 171, Issue 3

[Milad Fard]

Dear Zahra,

In general, the greater activity used in a study, the higher the ratio of
Random-to-True coincidence rates.
This is because the random coincidence rate increases as the *square of the
amount of activity* present, whereas the true coincidence rate increases
only *linearly *with the amount
of activity administered.
In addition, the ratio of Random-to-True coincidence decreases in
proportion to the *width *of the coincidence timing window.
Therefore, I think it is normal

Milad Fard,


On Mon, Aug 3, 2020 at 3:32 PM <
gate-users-request at lists.opengatecollaboration.org> wrote:

> Send Gate-users mailing list submissions to
>         gate-users at lists.opengatecollaboration.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
>         http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
> or, via email, send a message with subject or body 'help' to
>         gate-users-request at lists.opengatecollaboration.org
>
> You can reach the person managing the list at
>         gate-users-owner at lists.opengatecollaboration.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Gate-users digest..."
>
>
> Today's Topics:
>
>    1. Re: N E C R (Xinjie Cao)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 2 Aug 2020 10:46:49 -0400
> From: Xinjie Cao <xinjie.cao at stonybrook.edu>
> To: Zahra Fathihossienabadi <zahrafathi71 at ph.iut.ac.ir>
> Cc: gate-users at lists.opengatecollaboration.org
> Subject: Re: [Gate-users] N E C R
> Message-ID:
>         <CADNPNDmJXhiv=
> RvKOvHqDQJrM78MYEjGW3tWmBkXKq7Rvrk4Ew at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Zahra,
>
> I think it is normal, my NEMA test is similar. You could also find the
> similar situation in some PET simulation papers.
>
> Best,
> Xinjie
>
> On Sun, Aug 2, 2020 at 1:51 AM Zahra Fathihossienabadi <
> zahrafathi71 at ph.iut.ac.ir> wrote:
>
> > Hi dear users
> > I want to get the scatter fraction and true and random rate so that I can
> > calculate parameter NECR.
> > I putted the phantom similar to the NEMA.
> > for example When I want to calculated NECR for 10 kBq/ml, the true rate
> is
> > much lower than the random rate.
> > Is this normal or is there something wrong with my simulation?
> >
> > Thanks in advance for any answers.
> > _______________________________________________
> > Gate-users mailing list
> > Gate-users at lists.opengatecollaboration.org
> > http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>
>
>
> --
> *....................................................*
> *Xinjie Cao*
> *M.E. / Ph.D. student*
> *Research Project Assistant*
> *Department of Electrical and Computer Engineering & Radiology *
> *Novel Medical Imaging Technologies Lab*
> *Health Science Center Level 8*
> *Stony Brook, NY 11794-8460 *
> *Tel: +1 (631)202-9445*
> you.stonybrook.edu/goldan/people/
> *email: **xinjie.cao at stonybroo*k.edu <xinjie.cao at stonybrook.edu>
>
>
> *....................................................*
> It is prohibited to distribute or publish the files attached to any other
> people unless you get permission from the writer himself. All rights
> reserved.
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> http://lists.opengatecollaboration.org/pipermail/gate-users/attachments/20200802/7999afbb/attachment-0001.html
> >
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>
> ------------------------------
>
> End of Gate-users Digest, Vol 171, Issue 3
> ******************************************
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opengatecollaboration.org/pipermail/gate-users/attachments/20200803/bfae1e3d/attachment.html>