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

[Simon Stute]

Hey,

Maybe you lack of RAM. It could be a reason for bad_alloc.
When the activity is high, you need higher buffer size in the simulation,
so maybe it is the reason.

Cheers,
Simon

2012/2/7 賴 佳琳 <hlisak at hotmail.com>

>
> 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”
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