[Gate-users] ECAT7 output with user defined scanner

[Johannes Anderl]

Dear all,
 
I have a problem concerning the ECAT7 Output. 
I would like to simulate a user defined scanner and not the E962 scanner type. 
The created yourSinogram.S file still contains the default values (ring diameter, detectors per ring,...)  for the E962 scanner model.
Is there a possbility to get this ECAT7 *.S output with the user defined scanner values?
 
The code for the user defined scanner type can be seen below:
 
/gate/world/daughters/name ecat
/gate/world/daughters/insert cylinder
/gate/ecat/setMaterial Air
/gate/ecat/geometry/setRmax 44.1 cm
/gate/ecat/geometry/setRmin 42.1 cm
/gate/ecat/geometry/setHeight 21.7685 cm
/gate/ecat/vis/forceWireframe

#     B L O C K
/gate/ecat/daughters/name block
/gate/ecat/daughters/insert box
/gate/block/placement/setTranslation 431.0 0.0 0.0 mm 
/gate/block/geometry/setXLength 20.0 mm                 
/gate/block/geometry/setYLength 52.17127 mm
/gate/block/geometry/setZLength 52.17127 mm
/gate/block/setMaterial Air
/gate/block/vis/forceWireframe

# C R Y S T A L
/gate/block/daughters/name crystal
/gate/block/daughters/insert box
/gate/crystal/geometry/setXLength 20.0 mm
/gate/crystal/geometry/setYLength 4 mm
/gate/crystal/geometry/setZLength 4 mm
/gate/crystal/setMaterial LSO
/gate/crystal/vis/setColor yellow
 
# R E P E A T    C R Y S T A L
/gate/crystal/repeaters/insert cubicArray
/gate/crystal/cubicArray/setRepeatNumberX 1
/gate/crystal/cubicArray/setRepeatNumberY 13
/gate/crystal/cubicArray/setRepeatNumberZ 13
/gate/crystal/cubicArray/setRepeatVector 0. 4.0142725 4.0142725 mm

# R E P E A T    BLOCK (reproduziert die Box entlang eines Rings)
/gate/block/repeaters/insert linear
/gate/block/linear/setRepeatNumber 4
/gate/block/linear/setRepeatVector 0. 0. 55.17127 mm
/gate/block/repeaters/insert ring
/gate/block/ring/setRepeatNumber 48
 
The ecat7 code can be seen below:
 
/gate/output/ecat7/enable
/gate/output/ecat7/verbose 2
/gate/output/ecat7/setFileName yourSinogram
/gate/output/ecat7/describe
/gate/output/ecat7/mashing 2
/gate/output/ecat7/span 103
/gate/output/ecat7/maxringdiff 51
#/gate/output/ecat7/system 962  
 
Looking at the values from the yoursinogram.S using list_projdata_info  from STIR shows:
 

WARNING: ECAT7 IO: Couldn't determine the scanner 
(Main_header.system_type=0), defaulting to 962.
This might give dramatic problems.


WARNING: ECAT7 IO: Bin size from header.x_resolution (2.00714) does not agree with expected value 2.25
for scanner ECAT 962. Using bin size from header...
Info for file yourSinogram.S
ProjDataInfoCylindricalNoArcCorr := 
Scanner parameters:= 
Scanner type := ECAT 962
Number of rings                          := 32
Number of detectors per ring             := 576
Inner ring diameter (cm)                 := 82.4
Average depth of interaction (cm)        := 0.7
Distance between rings (cm)              := 0.485
Default bin size (cm)                    := 0.200714
View offset (degrees)                    := 0
Maximum number of non-arc-corrected bins := 288
Default number of arc-corrected bins     := 288
Number of blocks per bucket in transaxial direction         := 3
Number of blocks per bucket in axial direction              := 4
Number of crystals per block in axial direction             := 8
Number of crystals per block in transaxial direction        := 8
Number of detector layers                                   := 1
Number of crystals per singles unit in axial direction      := 8
Number of crystals per singles unit in transaxial direction := 24
end scanner parameters:=

 
Thanks in advance,
 
Johannes  
  
 		 	   		  
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