[Gate-users] SPECT with I-123 and In-111

Wed Jan 14 17:47:06 CET 2015

Hi Debora,

in the GATE manual it written like this:

In the case of ions, the kinetic energy must be 0 since the ions are at rest:
/gate/source/NAME/gps/monoenergy 0. ev

i.e., this is the energy of the ion!!

Concerning the half-life, you should use the proper value for the particular
isotope. In my example, with the intention to show the energy spectra, the
half-life is not relevant and the value I used was the easiest solution ;-))

Concerning the line:

/gate/source/IonSource/gps/number 1

I cannot help you, sorry, but maybe it simply belongs to the definition
of the “gps”, the general particle source, taken over from GEANT4.

Maybe, some experts can explain it to us.

Kind regards and best wishes,

Uwe
/----------------------------------------------------------------------
Prof. Dr. Uwe Pietrzyk
Diplom-Physiker
Institut für Neurowissenschaften und Medizin / INM-4
Forschungszentrum Jülich GmbH
52425 Jülich
Tel: +49-2461-61 4763
Fax: +49-2461-61 2820
Mobil: +49-162-103-4871
eMail: U.Pietrzyk at fz-juelich.de<mailto:U.Pietrzyk at fz-juelich.de>
http://www.fz-juelich.de/inm/inm-4/DE/Home/home_node.html
&
Bergische Universität Wuppertal
Fachbereich C - Physik / D.08.01
Gaußstr. 20
42097 Wuppertal
Tel: +49-(0)202-439-3523
Fax: +49-(0)202-439-2811
eMail: Uwe.Pietrzyk at physik.uni-wuppertal.de<mailto:Uwe.Pietrzyk at physik.uni-wuppertal.de>
http://www.medizinphysik.uni-wuppertal.de<http://www.medizinphysik.uni-wuppertal.de/>
----------------------------------------------------------------------/

On 14 Jan 2015, at 17:17, Débora Salvado <debbiesal at gmail.com<mailto:debbiesal at gmail.com>> wrote:

Thanks, it helps a lot!

Can I just ask you a couple more questions?

/gate/source/IonSource/setForcedHalfLife 99999999.0 s   -->should I leave this without any number or set it to my radionuclide's half-life?
/gate/source/IonSource/gps/monoenergy 0. MeV            -->is this the energy of the photopeak?
/gate/source/IonSource/gps/number 1                     -->what number does this refer to?

Regards,
Débora Salvado

2015-01-14 15:59 GMT+00:00 Pietrzyk, Uwe <u.pietrzyk at fz-juelich.de<mailto:u.pietrzyk at fz-juelich.de>>:

Hi Debora,

for Isotopes like In-111 or I-123 you should use the ion as the particle in
the source description and leave the energy type as Mono.

See also the attached macro, which I used for the EduGATE - Spectro example.
I also copy the macro here in case there is a problem with attachments,
while sending a reply to the “gate-user-list”.
(The aliases like {Ion_Z_val} and {Ion_A_val}, etc are replaced by the selection
from the menu of the GUI running the example as shown in the Readme).

Hope this is helpful for you,

Kind regards,

Uwe Pietrzyk
-----------------------------------------------------------------------------------------------
#
# S O U R C E S
#

# source: ion
/gate/source/addSource        IonSource

/gate/source/IonSource/setActivity        {SourceActivity}

/gate/source/IonSource/gps/type Volume
/gate/source/IonSource/gps/shape Sphere
#/gate/source/IonSource/gps/radius 0.1 mm
/gate/source/IonSource/gps/radius {SourceRad}
/gate/source/IonSource/gps/centre 0.0 0.0 0.0 cm

##
## universal ion source
## with arbitrary halflife
##
/gate/source/IonSource/gps/particle ion
/gate/source/IonSource/gps/ion {Ion_Z_val} {Ion_A_val} 0 0
/gate/source/IonSource/setForcedUnstableFlag true
/gate/source/IonSource/setForcedHalfLife 99999999.0 s
/gate/source/IonSource/gps/energytype Mono
/gate/source/IonSource/gps/monoenergy 0. MeV
/gate/source/IonSource/gps/number 1

/gate/source/IonSource/gps/angtype iso
/gate/source/IonSource/gps/mintheta 0. deg
/gate/source/IonSource/gps/maxtheta 180. deg
/gate/source/IonSource/gps/minphi 0. deg
/gate/source/IonSource/gps/maxphi 360. deg

/gate/source/list

#/gate/source/IonSource/gps/confine source_vol

/----------------------------------------------------------------------
Prof. Dr. Uwe Pietrzyk
Diplom-Physiker
Institut für Neurowissenschaften und Medizin / INM-4
Forschungszentrum Jülich GmbH
52425 Jülich
Tel: +49-2461-61 4763<tel:%2B49-2461-61%204763>
Fax: +49-2461-61 2820<tel:%2B49-2461-61%202820>
Mobil: +49-162-103-4871<tel:%2B49-162-103-4871>
eMail: U.Pietrzyk at fz-juelich.de<mailto:U.Pietrzyk at fz-juelich.de>
http://www.fz-juelich.de/inm/inm-4/DE/Home/home_node.html
&
Bergische Universität Wuppertal
Fachbereich C - Physik / D.08.01
Gaußstr. 20
42097 Wuppertal
Tel: +49-(0)202-439-3523<tel:%2B49-%280%29202-439-3523>
Fax: +49-(0)202-439-2811<tel:%2B49-%280%29202-439-2811>
eMail: Uwe.Pietrzyk at physik.uni-wuppertal.de<mailto:Uwe.Pietrzyk at physik.uni-wuppertal.de>
http://www.medizinphysik.uni-wuppertal.de<http://www.medizinphysik.uni-wuppertal.de/>
----------------------------------------------------------------------/

On 14 Jan 2015, at 16:24, D�bora Salvado <debbiesal at gmail.com<mailto:debbiesal at gmail.com>> wrote:

Dear GATE users,

How should I define the energy type for I-123 and In-111 in my SPECT simulations?

For Tc-99m, I'm using :
particle                 gamma
energytype            Mono
monoenergy          141. keV
setForcedHalfLife   6. h

but In-111 has two photopeaks (171 and 245 keV) and I-123 has a significant amount of photons (abundance 3.1%) with a higher energy than the photopeak (159 keV), so I'm not sure how to define my source in either of the cases, I-123 and In-111.

Thanks.
Debora Salvado
_______________________________________________
Gate-users mailing list
Gate-users at lists.opengatecollaboration.org<mailto:Gate-users at lists.opengatecollaboration.org>
http://lists.opengatecollaboration.org/mailman/listinfo/gate-users

------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------
Forschungszentrum Juelich GmbH
52425 Juelich
Sitz der Gesellschaft: Juelich
Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498
Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher
Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender),
Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt,
Prof. Dr. Sebastian M. Schmidt
------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20150114/c78cac8e/attachment.html>