[Gate-users] the detectors don't work at specific activity

[賴 佳琳]

Dear all, 
   I used the “benchSPECT.mac” to acquire data, and had modified some parameters. The SPECT benchmark consists 4 detector heads at 90 degree each, and consist of 16 projections per head. When the activity is smaller than 1 MBq each detector can acquire data normally, however, when the activity is increased to 1 MBq some detectors just don’t work at specific position. And the terminal showed 
 
“......
[Acquisition-0] Slice 8 from 300 to 337.5 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 9 from 337.5 to 375 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 10 from 375 to 412.5 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 11 from 412.5 to 450 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 12 from 450 to 487.5 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 13 from 487.5 to 525 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
terminate called after throwing an instance of 'std::bad_alloc’
  what():  std::bad_alloc ”
 
 

P.S.
When the activity is smaller than 1 MBq, the terminal showed
 
“......
[Acquisition-0] Slice 7 from 262.5 to 300 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 8 from 300 to 337.5 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 9 from 337.5 to 375 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 10 from 375 to 412.5 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 11 from 412.5 to 450 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 12 from 450 to 487.5 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 13 from 487.5 to 525 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 14 from 525 to 562.5 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Acquisition-0] Slice 15 from 562.5 to 600 s [slice=37.5 s], final stop at 600 s.
[G4]  clearing up the projection data matrices ... done 
[Core-0] End of macro benchSPECT.mac”