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<p style="margin:0in;font-family:Calibri;font-size:11.0pt">Dear
Gate-users,</p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt">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.</p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt">1: I
convert the
dicom files into .hdr/.img files with the vv programme, to insert
the .hdr file
with the commands: </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt">/gate/world/daughters/name<span
style="mso-spacerun:yes">
</span>patient<br>
/gate/world/daughters/insert<span style="mso-spacerun:yes">
</span>ImageNestedParametrisedVolume<br>
/gate/patient/geometry/SetImage<span style="mso-spacerun:yes">
</span>data/patient.hdr<br>
/gate/geometry/setMaterialDatabase<span style="mso-spacerun:yes">
</span>data/patient-HUmaterials.db<br>
/gate/patient/geometry/SetHUToMaterialFile<span
style="mso-spacerun:yes">
</span>data/patient-HU2mat.txt</p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt">When I
run the
simulation in Gate, I get the error: </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt">[Core-0]
Initialization of geometry</p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt">/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</p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt">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?</p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt">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)?</p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt"># Create
a simple
phantom called CCD <br>
/gate/world/daughters/name CCD <br>
/gate/world/daughters/insert parameterizedBoxMatrix</p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt"># Read
the
file : a 300x300x1 array <br>
/gate/CCD/geometry/insertReader image
<br>
/gate/CCD/imageReader/insertTranslator tabulated
<br>
/gate/CCD/imageReader/tabulatedTranslator/readTable ccdTable.dat
<br>
/gate/CCD/imageReader/readFile ccd300Phantom.dat</p>
<p
style="margin:0in;font-family:Calibri;font-size:9.0pt;color:#595959"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt">3: Maybe
an
unnecessary question: Are the attenuation coefficients of
materials (or more
specific body tissues) already included in Gate/material database?
</p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt">Thank you
very much
in advance.</p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt">Best
wishes,</p>
<p style="margin:0in;font-family:Calibri;font-size:11.0pt">Andrea
Steuwe</p>
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