[Gate-users] Attachment of block and crystal failure in ecat PET

[Zhengzhi Liu]

Dear GATE friends,

I am trying to add two end-cap detectors to an ecat PET system to increase
photon sensitivity. The visualization looks correct as shown below,
however, the attachment of block and crustal for two end-cap detectors
failed. Does GATE allow users to attach more than one sensitive detector to
a system?  Could you please give any suggestion on how to do it?

Here are commands used to attach two end-cap detectors:
# ATTACH the VOLUMES TO THE SYSTEM TREE
/gate/systems/ecat/block/attach     blockDetector
/gate/systems/ecat/block/attach     blockDetector1
/gate/systems/ecat/block/attach     blockDetector2
/gate/systems/ecat/crystal/attach   crystalUnit
/gate/systems/ecat/crystal/attach   crystalUnit1
/gate/systems/ecat/crystal/attach   crystalUnit2

# DEFINE THE SENSITIVE DETECTOR
/gate/crystalUnit/attachCrystalSD
/gate/crystalUnit1/attachCrystalSD
/gate/crystalUnit2/attachCrystalSD

Visualization:
[image: Screenshot from 2019-02-22 14-49-44.png]
Errors:

[Core-0] End of macro simu_pet.mac
Graphics systems deleted.
Visualization Manager deleting...
[systems/ecat/block::IsValidAttachmentRequest]:
A volume creator ('blockDetector') is already attached to this system
component
[systems/ecat/block::SetInserter]:
Ignoring attachment request
[systems/ecat/block::IsValidAttachmentRequest]:
A volume creator ('blockDetector') is already attached to this system
component
[systems/ecat/block::SetInserter]:
Ignoring attachment request
[systems/ecat/crystal::IsValidAttachmentRequest]:
A volume creator ('crystalUnit') is already attached to this system
component
[systems/ecat/crystal::SetInserter]:
Ignoring attachment request
[systems/ecat/crystal::IsValidAttachmentRequest]:
A volume creator ('crystalUnit') is already attached to this system
component
[systems/ecat/crystal::SetInserter]:
Ignoring attachment request


Thank you for your help.


-----------------------------------------------------
Zhengzhi Liu, Ph.D.
Postdoctoral research fellow
Molecular Imaging Program at Stanford
Department of Radiology
Stanford University
James H. Clark Center
318 Campus Drive, E150
Stanford, CA, 94305-5427
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