[Gate-users] Movement of source with cold_area

[Zhengzhi Liu]

Dear Gate users,

I am trying to move NEMA IQ phantom with the source along the axial
direction back and forth to simulate a real experiment that we have done. I
started with a much simpler case where there is only an annulus phantom
with an annulus source in the simulated PET system. Phantom as a volume is
very easy to be translated. According to the user manual, to move a
source,  the source had better be attached to a volume. For common source
without cold_area, it works very well. However, I found it did not work in
the case where the source is determined by a volume and a cold_area (which
is also a volume), such as the annulus source. Could anyone teach me how to
do so if it is possible?

Following is my code, I moved the phantom and cold_area simultaneously,
whether or not I attached the source to phantom, after the translation,
GATE did not return an annulus source rather a cylindrical source same as
the phantom as shown in the attached screenshot.

phantom.mac
#=====================================================
# WATER PHANTOM
#=====================================================
/gate/world/daughters/name                            Normal_AP
/gate/world/daughters/insert                          cylinder
/gate/Normal_AP/geometry/setRmax                      30.051 cm
/gate/Normal_AP/geometry/setRmin                      30.0 cm
/gate/Normal_AP/geometry/setHeight                    6 cm
/gate/Normal_AP/placement/setTranslation              0.0 0.0 0.0 cm
/gate/Normal_AP/moves/insert                       genericMove
/gate/Normal_AP/genericMove/setPlacementsFilename
 ./macros/phantomMovement0.placements
/gate/Normal_AP/setMaterial                           Water
/gate/Normal_AP/vis/forceSolid
/gate/Normal_AP/vis/setColor                          white
/gate/Normal_AP/vis/setVisible                        1

/gate/world/daughters/name                            cold_area
/gate/world/daughters/insert                          cylinder
/gate/cold_area/geometry/setRmax                      30.00 cm
/gate/cold_area/geometry/setHeight                    6 cm
/gate/cold_area/placement/setTranslation              0.0 0.0 0.0 cm
/gate/cold_area/moves/insert                       genericMove
/gate/cold_area/genericMove/setPlacementsFilename
 ./macros/phantomMovement0.placements
/gate/cold_area/setMaterial                           Air
/gate/cold_area/vis/forceWireframe
/gate/cold_area/vis/setColor white


source.mac
#=====================================================
# FASTER PRODUCTION MODULE FOR GE-68 ISOTOPES
#=====================================================
/gate/source/addSource                                 Ge68
/gate/source/Ge68/setActivity                          37000 Bq #1. uci
/gate/source/Ge68/gps/particle                         gamma
/gate/source/Ge68/setType                              backtoback
/gate/source/Ge68/gps/type                             Volume
/gate/source/Ge68/gps/shape                            Cylinder
/gate/source/Ge68/gps/radius                           30.051  cm
/gate/source/Ge68/gps/halfz                            3  cm
/gate/source/Ge68/gps/centre                           0. 0. 0. cm
#/gate/source/Ge68/attachTo                             Normal_AP
/gate/source/Ge68/gps/energytype                       Mono
/gate/source/Ge68/gps/monoenergy                       0.511 MeV
/gate/source/Ge68/gps/angtype                          iso
/gate/source/Ge68/setForcedUnstableFlag                false
 #/gate/source/Ge68/setForcedHalfLife                  6586 s
/gate/source/Ge68/gps/Forbid cold_area
/gate/source/Ge68/dump  1

/gate/source/list


Thanks a lot for your reading and any help.
Sincerely,
Zhengzhi
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opengatecollaboration.org/pipermail/gate-users/attachments/20200401/3da757b9/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: movement_of_annulus_source.png
Type: image/png
Size: 25256 bytes
Desc: not available
URL: <http://lists.opengatecollaboration.org/pipermail/gate-users/attachments/20200401/3da757b9/attachment-0001.png>