[Gate-users] Movement of source with cold_area

[Zhengzhi Liu]

Maybe this figure is better to illustrate my problem. I expected to get an
annulus source after simultaneously moving phantom and colde_area to a new
location, and attaching the source to the phantom, however, it looks after
the movement, the source didn't dump the portion in colde_area.
[image: movement_of_annulus_source1.png]

On Wed, Apr 1, 2020 at 3:23 PM Zhengzhi Liu <zliu36 at stanford.edu> wrote:

> 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/20200401/1cb09d27/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: movement_of_annulus_source1.png
Type: image/png
Size: 26900 bytes
Desc: not available
URL: <http://lists.opengatecollaboration.org/pipermail/gate-users/attachments/20200401/1cb09d27/attachment-0001.png>