<div dir="ltr">Dear Gate users,<br><div><br></div><div>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?</div><div><br></div><div>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. <br></div><div><br></div><div>phantom.mac<br></div><div>#=====================================================<br># WATER PHANTOM<br>#=====================================================<br>/gate/world/daughters/name                            Normal_AP<br>/gate/world/daughters/insert                          cylinder<br>/gate/Normal_AP/geometry/setRmax                      30.051 cm<br>/gate/Normal_AP/geometry/setRmin                      30.0 cm<br>/gate/Normal_AP/geometry/setHeight                    6 cm<br>/gate/Normal_AP/placement/setTranslation              0.0 0.0 0.0 cm<br>/gate/Normal_AP/moves/insert                       genericMove<br>/gate/Normal_AP/genericMove/setPlacementsFilename  ./macros/phantomMovement0.placements<br>/gate/Normal_AP/setMaterial                           Water<br>/gate/Normal_AP/vis/forceSolid<br>/gate/Normal_AP/vis/setColor                          white<br>/gate/Normal_AP/vis/setVisible                        1<br><br>/gate/world/daughters/name                            cold_area<br>/gate/world/daughters/insert                          cylinder<br>/gate/cold_area/geometry/setRmax                      30.00 cm<br>/gate/cold_area/geometry/setHeight                    6 cm<br>/gate/cold_area/placement/setTranslation              0.0 0.0 0.0 cm<br>/gate/cold_area/moves/insert                       genericMove<br>/gate/cold_area/genericMove/setPlacementsFilename  ./macros/phantomMovement0.placements<br>/gate/cold_area/setMaterial                           Air<br>/gate/cold_area/vis/forceWireframe<br>/gate/cold_area/vis/setColor white</div><div><br></div><div><br></div><div>source.mac<br></div><div>#=====================================================<br>#       FASTER PRODUCTION MODULE FOR GE-68 ISOTOPES<br>#=====================================================<br>/gate/source/addSource                                 Ge68<br>/gate/source/Ge68/setActivity                          37000 Bq #1. uci<br>/gate/source/Ge68/gps/particle                         gamma<br>/gate/source/Ge68/setType                              backtoback<br>/gate/source/Ge68/gps/type                             Volume<br>/gate/source/Ge68/gps/shape                            Cylinder<br>/gate/source/Ge68/gps/radius                           30.051  cm<br>/gate/source/Ge68/gps/halfz                            3  cm<br>/gate/source/Ge68/gps/centre                           0. 0. 0. cm<br>#/gate/source/Ge68/attachTo                             Normal_AP<br>/gate/source/Ge68/gps/energytype                       Mono<br>/gate/source/Ge68/gps/monoenergy                       0.511 MeV<br>/gate/source/Ge68/gps/angtype                          iso<br>/gate/source/Ge68/setForcedUnstableFlag                false<br> #/gate/source/Ge68/setForcedHalfLife                  6586 s<br>/gate/source/Ge68/gps/Forbid cold_area<br>/gate/source/Ge68/dump  1<br><br>/gate/source/list</div><div><br></div><div><br></div><div>Thanks a lot for your reading and any help.</div><div>Sincerely,</div><div>Zhengzhi </div><div><br></div></div>