[Gate-users] Mismatch between LOR and emission points on root output

[Abdul Fattah MOHAMAD HADI]

   Hi Enrico,
   I know that there is a bug in hits globalPos  calculation in
   GATE_6.0.p01 and in GATE_v6.1 , so error in pulses and digits
   positions. In  fact  in the line 114 of the file GateCrystalSD.cc you
   have to replace "oldStepPoint" by "newStepPoint" and recompile GATE, so
   maybe this is the reason of this mismatch.
   I hope this help,
   Abdul Fattah
   Enrico Clementel a ecrit :

Forgot to tell the source is backtoback.


On 20 May 2011, at 18:33, Enrico Clementel wrote:



Dear Gate Users,
I have a problem on both Gate 5.0.0 p1 and Gate 6.0.0 p1 using root output.
I'm simulating a PET scanner using the ECAT structure. Investigating the data we
 noticed that LORs belonging to True coincidences are very far from the actual e
mission points.
As an example, I'm attaching a 2D plot of a few events. I simulated a point sour
ce in a water cylinder. Blue lines represent LORs, red lines connect the actual
emission point to one LOR end. As you can see they are pretty far off.

To ensure I'm considering only Trues, I have the following condition:
if ( comptonCrystal1==0 && comptonCrystal2==0 && comptonPhantom1==0 && comptonPh
antom2==0 && eventID1 == eventID2 ) {
before printing the output. LOR ends are obtained from globalPos and the emissio
n point from sourcePos.

Any ideas why this could be happening?
Thank you
Enrico<untitled.png>_______________________________________________
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