[Gate-users] CT data input to model phantom

[Andrea Steuwe]

Dear Gate-users,

I have a few more questions regarding the input of CT-data into Gate. I 
am trying to use CT data to build a phantom to simulate SPECT scanning. 
I orientate myself by the chapter "Voxelized Source and Phantom" of the 
Gate manual, although I am not completely sure whether this chapter and 
instructions are useful for inserting CT data as a phantom.

1: I convert the dicom files into .hdr/.img files with the vv programme, 
to insert the .hdr file with the commands:

/gate/world/daughters/namepatient
/gate/world/daughters/insertImageNestedParametrisedVolume
/gate/patient/geometry/SetImagedata/patient.hdr
/gate/geometry/setMaterialDatabasedata/patient-HUmaterials.db
/gate/patient/geometry/SetHUToMaterialFiledata/patient-HU2mat.txt

When I run the simulation in Gate, I get the error:

[Core-0] Initialization of geometry

/home/gate/Progs/gate_v6.2/source/general/src/GateImage.cc (l.1028): I 
don't know (yet) this voxel type ... try float or unsigned char

The image file (patient.img) however is already a 32 bit float. Do I 
overlook something? Should I use .hdr/.img files or a different file format?

2: Should I better use the command "parameterizedBoxMatrix" to insert 
the CT data? In this case, what data needs to be given in the .dat files 
(example below)?

# Create a simple phantom called CCD
/gate/world/daughters/name CCD
/gate/world/daughters/insert parameterizedBoxMatrix

# Read the file : a 300x300x1 array
/gate/CCD/geometry/insertReader image
/gate/CCD/imageReader/insertTranslator tabulated
/gate/CCD/imageReader/tabulatedTranslator/readTable ccdTable.dat
/gate/CCD/imageReader/readFile ccd300Phantom.dat

3: Maybe an unnecessary question: Are the attenuation coefficients of 
materials (or more specific body tissues) already included in 
Gate/material database?

Thank you very much in advance.

Best wishes,

Andrea Steuwe

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