[Gate-users] Siemens Symbia Intevo HE Collimator

[Anestis Nakas]

Hello all,


I am trying to model in Gate a high energy collimator, based on the Siemens Symbia Intevo SPECT Specifications.

I have the septal thickness and hole diameter taken from the specifications, but my problem is that the resulting holes are way less (6760) than the ones the people from Siemes suggest (8000). I have checked my calculations many times and I do not see any problems in them. Also I used the same calculations for the case of the medium energy collimator (from same specifications), to verify if they are correct, and I do get good results based on the Siemens Specifications.


I do not know, however, apart from the hole length the exact dimensions of the HE collimator (they are not provided in the Specifications), so I used the medium energy collimator's ones, that I was given from another source.


I have my macros provided below. Any suggestions or help are welcomed.


#############
# W O R L D #
#############

/gate/world/geometry/setXLength 100 cm
/gate/world/geometry/setYLength 100 cm
/gate/world/geometry/setZLength 100 cm

# S C A N N E R   H E A D

/gate/world/daughters/name SPECThead
/gate/world/daughters/insert box
/gate/SPECThead/geometry/setXLength 15.964 cm
/gate/SPECThead/geometry/setYLength 47.04 cm
/gate/SPECThead/geometry/setZLength 61.64 cm
/gate/SPECThead/placement/setTranslation -27.982 0. 0. cm
/gate/SPECThead/setMaterial Air
/gate/SPECThead/attachPhantomSD
/gate/SPECThead/vis/setColor white
/gate/SPECThead/vis/forceWireframe

#/gate/SPECThead/repeaters/insert ring
#/gate/SPECThead/ring/setRepeatNumber 2


# S H I E L D I N G

/gate/SPECThead/daughters/name shielding
/gate/SPECThead/daughters/insert box
/gate/shielding/geometry/setXLength 15.964 cm
/gate/shielding/geometry/setYLength 47.04 cm
/gate/shielding/geometry/setZLength 61.64 cm
/gate/shielding/setMaterial Lead
/gate/shielding/attachPhantomSD
/gate/shielding/vis/forceWireframe
/gate/shielding/vis/setColor red

############################
# HIGH ENERGY COLLIMATOR #
############################

# C O L L I M A T O R

/gate/shielding/daughters/name collimator
/gate/shielding/daughters/insert box
/gate/collimator/geometry/setXLength 59.7 mm
/gate/collimator/geometry/setYLength 394. mm
/gate/collimator/geometry/setZLength 545. mm
/gate/collimator/placement/setTranslation 69.03 0. 0. mm
/gate/collimator/setMaterial Lead
/gate/collimator/attachPhantomSD
/gate/collimator/vis/forceWireframe
/gate/collimator/vis/setColor blue


# H O L E S

/gate/collimator/daughters/name hole
/gate/collimator/daughters/insert hexagone
/gate/hole/geometry/setHeight 59.7 mm
/gate/hole/geometry/setRadius  2.0 mm
/gate/hole/placement/setRotationAxis 0 1 0
/gate/hole/placement/setRotationAngle 90 deg
/gate/hole/setMaterial Air
/gate/hole/vis/forceWireframe
/gate/hole/vis/setColor white

/gate/hole/repeaters/insert cubicArray
/gate/hole/cubicArray/setRepeatNumberX 1
/gate/hole/cubicArray/setRepeatNumberY 65
/gate/hole/cubicArray/setRepeatNumberZ 52
/gate/hole/cubicArray/setRepeatVector 0. 6.00 10.39 mm

/gate/hole/repeaters/insert linear
/gate/hole/linear/setRepeatNumber 2
/gate/hole/linear/setRepeatVector 0. 3.00 5.195 mm



Yours sincerely,


Anestis
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opengatecollaboration.org/pipermail/gate-users/attachments/20191122/4b05858f/attachment.html>